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/6lowpan.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         .proxy_ndp              = 0,
 209         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 210         .disable_ipv6           = 0,
 211         .accept_dad             = 1,
 212         .suppress_frag_ndisc    = 1,
 213         .accept_ra_mtu          = 1,
 214         .stable_secret          = {
 215                 .initialized = false,
 216         },
 217         .use_oif_addrs_only     = 0,
 218         .ignore_routes_with_linkdown = 0,
 219         .keep_addr_on_down      = 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         .proxy_ndp              = 0,
 254         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 255         .disable_ipv6           = 0,
 256         .accept_dad             = 1,
 257         .suppress_frag_ndisc    = 1,
 258         .accept_ra_mtu          = 1,
 259         .stable_secret          = {
 260                 .initialized = false,
 261         },
 262         .use_oif_addrs_only     = 0,
 263         .ignore_routes_with_linkdown = 0,
 264         .keep_addr_on_down      = 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->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 363         if (!ndev->nd_parms) {
 364                 kfree(ndev);
 365                 return ERR_PTR(err);
 366         }
 367         if (ndev->cnf.forwarding)
 368                 dev_disable_lro(dev);
 369         /* We refer to the device */
 370         dev_hold(dev);
 371
 372         if (snmp6_alloc_dev(ndev) < 0) {
 373                 ADBG(KERN_WARNING
 374                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 375                         __func__, dev->name);
 376                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 377                 dev_put(dev);
 378                 kfree(ndev);
 379                 return ERR_PTR(err);
 380         }
 381
 382         if (snmp6_register_dev(ndev) < 0) {
 383                 ADBG(KERN_WARNING
 384                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 385                         __func__, dev->name);
 386                 goto err_release;
 387         }
 388
 389         /* One reference from device.  We must do this before
 390          * we invoke __ipv6_regen_rndid().
 391          */
 392         in6_dev_hold(ndev);
 393
 394         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 395                 ndev->cnf.accept_dad = -1;
 396
 397 #if IS_ENABLED(CONFIG_IPV6_SIT)
 398         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 399                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 400                 ndev->cnf.rtr_solicits = 0;
 401         }
 402 #endif
 403
 404         INIT_LIST_HEAD(&ndev->tempaddr_list);
 405         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 406         if ((dev->flags&IFF_LOOPBACK) ||
 407             dev->type == ARPHRD_TUNNEL ||
 408             dev->type == ARPHRD_TUNNEL6 ||
 409             dev->type == ARPHRD_SIT ||
 410             dev->type == ARPHRD_NONE) {
 411                 ndev->cnf.use_tempaddr = -1;
 412         } else {
 413                 in6_dev_hold(ndev);
 414                 ipv6_regen_rndid((unsigned long) ndev);
 415         }
 416
 417         ndev->token = in6addr_any;
 418
 419         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 420                 ndev->if_flags |= IF_READY;
 421
 422         ipv6_mc_init_dev(ndev);
 423         ndev->tstamp = jiffies;
 424         err = addrconf_sysctl_register(ndev);
 425         if (err) {
 426                 ipv6_mc_destroy_dev(ndev);
 427                 del_timer(&ndev->regen_timer);
 428                 snmp6_unregister_dev(ndev);
 429                 goto err_release;
 430         }
 431         /* protected by rtnl_lock */
 432         rcu_assign_pointer(dev->ip6_ptr, ndev);
 433
 434         /* Join interface-local all-node multicast group */
 435         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 436
 437         /* Join all-node multicast group */
 438         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 439
 440         /* Join all-router multicast group if forwarding is set */
 441         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 442                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 443
 444         return ndev;
 445
 446 err_release:
 447         neigh_parms_release(&nd_tbl, ndev->nd_parms);
 448         ndev->dead = 1;
 449         in6_dev_finish_destroy(ndev);
 450         return ERR_PTR(err);
 451 }
 452
 453 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 454 {
 455         struct inet6_dev *idev;
 456
 457         ASSERT_RTNL();
 458
 459         idev = __in6_dev_get(dev);
 460         if (!idev) {
 461                 idev = ipv6_add_dev(dev);
 462                 if (IS_ERR(idev))
 463                         return NULL;
 464         }
 465
 466         if (dev->flags&IFF_UP)
 467                 ipv6_mc_up(idev);
 468         return idev;
 469 }
 470
 471 static int inet6_netconf_msgsize_devconf(int type)
 472 {
 473         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 474                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 475         bool all = false;
 476
 477         if (type == NETCONFA_ALL)
 478                 all = true;
 479
 480         if (all || type == NETCONFA_FORWARDING)
 481                 size += nla_total_size(4);
 482 #ifdef CONFIG_IPV6_MROUTE
 483         if (all || type == NETCONFA_MC_FORWARDING)
 484                 size += nla_total_size(4);
 485 #endif
 486         if (all || type == NETCONFA_PROXY_NEIGH)
 487                 size += nla_total_size(4);
 488
 489         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
 490                 size += nla_total_size(4);
 491
 492         return size;
 493 }
 494
 495 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 496                                       struct ipv6_devconf *devconf, u32 portid,
 497                                       u32 seq, int event, unsigned int flags,
 498                                       int type)
 499 {
 500         struct nlmsghdr  *nlh;
 501         struct netconfmsg *ncm;
 502         bool all = false;
 503
 504         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 505                         flags);
 506         if (!nlh)
 507                 return -EMSGSIZE;
 508
 509         if (type == NETCONFA_ALL)
 510                 all = true;
 511
 512         ncm = nlmsg_data(nlh);
 513         ncm->ncm_family = AF_INET6;
 514
 515         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 516                 goto nla_put_failure;
 517
 518         if ((all || type == NETCONFA_FORWARDING) &&
 519             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 520                 goto nla_put_failure;
 521 #ifdef CONFIG_IPV6_MROUTE
 522         if ((all || type == NETCONFA_MC_FORWARDING) &&
 523             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 524                         devconf->mc_forwarding) < 0)
 525                 goto nla_put_failure;
 526 #endif
 527         if ((all || type == NETCONFA_PROXY_NEIGH) &&
 528             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 529                 goto nla_put_failure;
 530
 531         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
 532             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 533                         devconf->ignore_routes_with_linkdown) < 0)
 534                 goto nla_put_failure;
 535
 536         nlmsg_end(skb, nlh);
 537         return 0;
 538
 539 nla_put_failure:
 540         nlmsg_cancel(skb, nlh);
 541         return -EMSGSIZE;
 542 }
 543
 544 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 545                                   struct ipv6_devconf *devconf)
 546 {
 547         struct sk_buff *skb;
 548         int err = -ENOBUFS;
 549
 550         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
 551         if (!skb)
 552                 goto errout;
 553
 554         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 555                                          RTM_NEWNETCONF, 0, type);
 556         if (err < 0) {
 557                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 558                 WARN_ON(err == -EMSGSIZE);
 559                 kfree_skb(skb);
 560                 goto errout;
 561         }
 562         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
 563         return;
 564 errout:
 565         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 566 }
 567
 568 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 569         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 570         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 571         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
 572         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
 573 };
 574
 575 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 576                                      struct nlmsghdr *nlh)
 577 {
 578         struct net *net = sock_net(in_skb->sk);
 579         struct nlattr *tb[NETCONFA_MAX+1];
 580         struct netconfmsg *ncm;
 581         struct sk_buff *skb;
 582         struct ipv6_devconf *devconf;
 583         struct inet6_dev *in6_dev;
 584         struct net_device *dev;
 585         int ifindex;
 586         int err;
 587
 588         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 589                           devconf_ipv6_policy);
 590         if (err < 0)
 591                 goto errout;
 592
 593         err = -EINVAL;
 594         if (!tb[NETCONFA_IFINDEX])
 595                 goto errout;
 596
 597         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 598         switch (ifindex) {
 599         case NETCONFA_IFINDEX_ALL:
 600                 devconf = net->ipv6.devconf_all;
 601                 break;
 602         case NETCONFA_IFINDEX_DEFAULT:
 603                 devconf = net->ipv6.devconf_dflt;
 604                 break;
 605         default:
 606                 dev = __dev_get_by_index(net, ifindex);
 607                 if (!dev)
 608                         goto errout;
 609                 in6_dev = __in6_dev_get(dev);
 610                 if (!in6_dev)
 611                         goto errout;
 612                 devconf = &in6_dev->cnf;
 613                 break;
 614         }
 615
 616         err = -ENOBUFS;
 617         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
 618         if (!skb)
 619                 goto errout;
 620
 621         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 622                                          NETLINK_CB(in_skb).portid,
 623                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 624                                          NETCONFA_ALL);
 625         if (err < 0) {
 626                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 627                 WARN_ON(err == -EMSGSIZE);
 628                 kfree_skb(skb);
 629                 goto errout;
 630         }
 631         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 632 errout:
 633         return err;
 634 }
 635
 636 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 637                                       struct netlink_callback *cb)
 638 {
 639         struct net *net = sock_net(skb->sk);
 640         int h, s_h;
 641         int idx, s_idx;
 642         struct net_device *dev;
 643         struct inet6_dev *idev;
 644         struct hlist_head *head;
 645
 646         s_h = cb->args[0];
 647         s_idx = idx = cb->args[1];
 648
 649         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 650                 idx = 0;
 651                 head = &net->dev_index_head[h];
 652                 rcu_read_lock();
 653                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 654                           net->dev_base_seq;
 655                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 656                         if (idx < s_idx)
 657                                 goto cont;
 658                         idev = __in6_dev_get(dev);
 659                         if (!idev)
 660                                 goto cont;
 661
 662                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 663                                                        &idev->cnf,
 664                                                        NETLINK_CB(cb->skb).portid,
 665                                                        cb->nlh->nlmsg_seq,
 666                                                        RTM_NEWNETCONF,
 667                                                        NLM_F_MULTI,
 668                                                        NETCONFA_ALL) < 0) {
 669                                 rcu_read_unlock();
 670                                 goto done;
 671                         }
 672                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 673 cont:
 674                         idx++;
 675                 }
 676                 rcu_read_unlock();
 677         }
 678         if (h == NETDEV_HASHENTRIES) {
 679                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 680                                                net->ipv6.devconf_all,
 681                                                NETLINK_CB(cb->skb).portid,
 682                                                cb->nlh->nlmsg_seq,
 683                                                RTM_NEWNETCONF, NLM_F_MULTI,
 684                                                NETCONFA_ALL) < 0)
 685                         goto done;
 686                 else
 687                         h++;
 688         }
 689         if (h == NETDEV_HASHENTRIES + 1) {
 690                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 691                                                net->ipv6.devconf_dflt,
 692                                                NETLINK_CB(cb->skb).portid,
 693                                                cb->nlh->nlmsg_seq,
 694                                                RTM_NEWNETCONF, NLM_F_MULTI,
 695                                                NETCONFA_ALL) < 0)
 696                         goto done;
 697                 else
 698                         h++;
 699         }
 700 done:
 701         cb->args[0] = h;
 702         cb->args[1] = idx;
 703
 704         return skb->len;
 705 }
 706
 707 #ifdef CONFIG_SYSCTL
 708 static void dev_forward_change(struct inet6_dev *idev)
 709 {
 710         struct net_device *dev;
 711         struct inet6_ifaddr *ifa;
 712
 713         if (!idev)
 714                 return;
 715         dev = idev->dev;
 716         if (idev->cnf.forwarding)
 717                 dev_disable_lro(dev);
 718         if (dev->flags & IFF_MULTICAST) {
 719                 if (idev->cnf.forwarding) {
 720                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 721                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 722                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 723                 } else {
 724                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 725                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 726                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 727                 }
 728         }
 729
 730         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 731                 if (ifa->flags&IFA_F_TENTATIVE)
 732                         continue;
 733                 if (idev->cnf.forwarding)
 734                         addrconf_join_anycast(ifa);
 735                 else
 736                         addrconf_leave_anycast(ifa);
 737         }
 738         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 739                                      dev->ifindex, &idev->cnf);
 740 }
 741
 742
 743 static void addrconf_forward_change(struct net *net, __s32 newf)
 744 {
 745         struct net_device *dev;
 746         struct inet6_dev *idev;
 747
 748         for_each_netdev(net, dev) {
 749                 idev = __in6_dev_get(dev);
 750                 if (idev) {
 751                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 752                         idev->cnf.forwarding = newf;
 753                         if (changed)
 754                                 dev_forward_change(idev);
 755                 }
 756         }
 757 }
 758
 759 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 760 {
 761         struct net *net;
 762         int old;
 763
 764         if (!rtnl_trylock())
 765                 return restart_syscall();
 766
 767         net = (struct net *)table->extra2;
 768         old = *p;
 769         *p = newf;
 770
 771         if (p == &net->ipv6.devconf_dflt->forwarding) {
 772                 if ((!newf) ^ (!old))
 773                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 774                                                      NETCONFA_IFINDEX_DEFAULT,
 775                                                      net->ipv6.devconf_dflt);
 776                 rtnl_unlock();
 777                 return 0;
 778         }
 779
 780         if (p == &net->ipv6.devconf_all->forwarding) {
 781                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
 782
 783                 net->ipv6.devconf_dflt->forwarding = newf;
 784                 if ((!newf) ^ (!old_dflt))
 785                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 786                                                      NETCONFA_IFINDEX_DEFAULT,
 787                                                      net->ipv6.devconf_dflt);
 788
 789                 addrconf_forward_change(net, newf);
 790                 if ((!newf) ^ (!old))
 791                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 792                                                      NETCONFA_IFINDEX_ALL,
 793                                                      net->ipv6.devconf_all);
 794         } else if ((!newf) ^ (!old))
 795                 dev_forward_change((struct inet6_dev *)table->extra1);
 796         rtnl_unlock();
 797
 798         if (newf)
 799                 rt6_purge_dflt_routers(net);
 800         return 1;
 801 }
 802
 803 static void addrconf_linkdown_change(struct net *net, __s32 newf)
 804 {
 805         struct net_device *dev;
 806         struct inet6_dev *idev;
 807
 808         for_each_netdev(net, dev) {
 809                 idev = __in6_dev_get(dev);
 810                 if (idev) {
 811                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
 812
 813                         idev->cnf.ignore_routes_with_linkdown = newf;
 814                         if (changed)
 815                                 inet6_netconf_notify_devconf(dev_net(dev),
 816                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 817                                                              dev->ifindex,
 818                                                              &idev->cnf);
 819                 }
 820         }
 821 }
 822
 823 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
 824 {
 825         struct net *net;
 826         int old;
 827
 828         if (!rtnl_trylock())
 829                 return restart_syscall();
 830
 831         net = (struct net *)table->extra2;
 832         old = *p;
 833         *p = newf;
 834
 835         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
 836                 if ((!newf) ^ (!old))
 837                         inet6_netconf_notify_devconf(net,
 838                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 839                                                      NETCONFA_IFINDEX_DEFAULT,
 840                                                      net->ipv6.devconf_dflt);
 841                 rtnl_unlock();
 842                 return 0;
 843         }
 844
 845         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
 846                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
 847                 addrconf_linkdown_change(net, newf);
 848                 if ((!newf) ^ (!old))
 849                         inet6_netconf_notify_devconf(net,
 850                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
 851                                                      NETCONFA_IFINDEX_ALL,
 852                                                      net->ipv6.devconf_all);
 853         }
 854         rtnl_unlock();
 855
 856         return 1;
 857 }
 858
 859 #endif
 860
 861 /* Nobody refers to this ifaddr, destroy it */
 862 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 863 {
 864         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 865
 866 #ifdef NET_REFCNT_DEBUG
 867         pr_debug("%s\n", __func__);
 868 #endif
 869
 870         in6_dev_put(ifp->idev);
 871
 872         if (cancel_delayed_work(&ifp->dad_work))
 873                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 874                           ifp);
 875
 876         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 877                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 878                 return;
 879         }
 880         ip6_rt_put(ifp->rt);
 881
 882         kfree_rcu(ifp, rcu);
 883 }
 884
 885 static void
 886 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 887 {
 888         struct list_head *p;
 889         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 890
 891         /*
 892          * Each device address list is sorted in order of scope -
 893          * global before linklocal.
 894          */
 895         list_for_each(p, &idev->addr_list) {
 896                 struct inet6_ifaddr *ifa
 897                         = list_entry(p, struct inet6_ifaddr, if_list);
 898                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 899                         break;
 900         }
 901
 902         list_add_tail(&ifp->if_list, p);
 903 }
 904
 905 static u32 inet6_addr_hash(const struct in6_addr *addr)
 906 {
 907         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 908 }
 909
 910 /* On success it returns ifp with increased reference count */
 911
 912 static struct inet6_ifaddr *
 913 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 914               const struct in6_addr *peer_addr, int pfxlen,
 915               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 916 {
 917         struct inet6_ifaddr *ifa = NULL;
 918         struct rt6_info *rt;
 919         unsigned int hash;
 920         int err = 0;
 921         int addr_type = ipv6_addr_type(addr);
 922
 923         if (addr_type == IPV6_ADDR_ANY ||
 924             addr_type & IPV6_ADDR_MULTICAST ||
 925             (!(idev->dev->flags & IFF_LOOPBACK) &&
 926              addr_type & IPV6_ADDR_LOOPBACK))
 927                 return ERR_PTR(-EADDRNOTAVAIL);
 928
 929         rcu_read_lock_bh();
 930         if (idev->dead) {
 931                 err = -ENODEV;                  /*XXX*/
 932                 goto out2;
 933         }
 934
 935         if (idev->cnf.disable_ipv6) {
 936                 err = -EACCES;
 937                 goto out2;
 938         }
 939
 940         spin_lock(&addrconf_hash_lock);
 941
 942         /* Ignore adding duplicate addresses on an interface */
 943         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 944                 ADBG("ipv6_add_addr: already assigned\n");
 945                 err = -EEXIST;
 946                 goto out;
 947         }
 948
 949         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 950
 951         if (!ifa) {
 952                 ADBG("ipv6_add_addr: malloc failed\n");
 953                 err = -ENOBUFS;
 954                 goto out;
 955         }
 956
 957         rt = addrconf_dst_alloc(idev, addr, false);
 958         if (IS_ERR(rt)) {
 959                 err = PTR_ERR(rt);
 960                 goto out;
 961         }
 962
 963         neigh_parms_data_state_setall(idev->nd_parms);
 964
 965         ifa->addr = *addr;
 966         if (peer_addr)
 967                 ifa->peer_addr = *peer_addr;
 968
 969         spin_lock_init(&ifa->lock);
 970         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 971         INIT_HLIST_NODE(&ifa->addr_lst);
 972         ifa->scope = scope;
 973         ifa->prefix_len = pfxlen;
 974         ifa->flags = flags | IFA_F_TENTATIVE;
 975         ifa->valid_lft = valid_lft;
 976         ifa->prefered_lft = prefered_lft;
 977         ifa->cstamp = ifa->tstamp = jiffies;
 978         ifa->tokenized = false;
 979
 980         ifa->rt = rt;
 981
 982         ifa->idev = idev;
 983         in6_dev_hold(idev);
 984         /* For caller */
 985         in6_ifa_hold(ifa);
 986
 987         /* Add to big hash table */
 988         hash = inet6_addr_hash(addr);
 989
 990         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 991         spin_unlock(&addrconf_hash_lock);
 992
 993         write_lock(&idev->lock);
 994         /* Add to inet6_dev unicast addr list. */
 995         ipv6_link_dev_addr(idev, ifa);
 996
 997         if (ifa->flags&IFA_F_TEMPORARY) {
 998                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 999                 in6_ifa_hold(ifa);
1000         }
1001
1002         in6_ifa_hold(ifa);
1003         write_unlock(&idev->lock);
1004 out2:
1005         rcu_read_unlock_bh();
1006
1007         if (likely(err == 0))
1008                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1009         else {
1010                 kfree(ifa);
1011                 ifa = ERR_PTR(err);
1012         }
1013
1014         return ifa;
1015 out:
1016         spin_unlock(&addrconf_hash_lock);
1017         goto out2;
1018 }
1019
1020 enum cleanup_prefix_rt_t {
1021         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1022         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1023         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1024 };
1025
1026 /*
1027  * Check, whether the prefix for ifp would still need a prefix route
1028  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1029  * constants.
1030  *
1031  * 1) we don't purge prefix if address was not permanent.
1032  *    prefix is managed by its own lifetime.
1033  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1034  * 3) if there are no addresses, delete prefix.
1035  * 4) if there are still other permanent address(es),
1036  *    corresponding prefix is still permanent.
1037  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1038  *    don't purge the prefix, assume user space is managing it.
1039  * 6) otherwise, update prefix lifetime to the
1040  *    longest valid lifetime among the corresponding
1041  *    addresses on the device.
1042  *    Note: subsequent RA will update lifetime.
1043  **/
1044 static enum cleanup_prefix_rt_t
1045 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1046 {
1047         struct inet6_ifaddr *ifa;
1048         struct inet6_dev *idev = ifp->idev;
1049         unsigned long lifetime;
1050         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1051
1052         *expires = jiffies;
1053
1054         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1055                 if (ifa == ifp)
1056                         continue;
1057                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1058                                        ifp->prefix_len))
1059                         continue;
1060                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1061                         return CLEANUP_PREFIX_RT_NOP;
1062
1063                 action = CLEANUP_PREFIX_RT_EXPIRE;
1064
1065                 spin_lock(&ifa->lock);
1066
1067                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1068                 /*
1069                  * Note: Because this address is
1070                  * not permanent, lifetime <
1071                  * LONG_MAX / HZ here.
1072                  */
1073                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1074                         *expires = ifa->tstamp + lifetime * HZ;
1075                 spin_unlock(&ifa->lock);
1076         }
1077
1078         return action;
1079 }
1080
1081 static void
1082 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1083 {
1084         struct rt6_info *rt;
1085
1086         rt = addrconf_get_prefix_route(&ifp->addr,
1087                                        ifp->prefix_len,
1088                                        ifp->idev->dev,
1089                                        0, RTF_GATEWAY | RTF_DEFAULT);
1090         if (rt) {
1091                 if (del_rt)
1092                         ip6_del_rt(rt);
1093                 else {
1094                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1095                                 rt6_set_expires(rt, expires);
1096                         ip6_rt_put(rt);
1097                 }
1098         }
1099 }
1100
1101
1102 /* This function wants to get referenced ifp and releases it before return */
1103
1104 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1105 {
1106         int state;
1107         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1108         unsigned long expires;
1109
1110         ASSERT_RTNL();
1111
1112         spin_lock_bh(&ifp->lock);
1113         state = ifp->state;
1114         ifp->state = INET6_IFADDR_STATE_DEAD;
1115         spin_unlock_bh(&ifp->lock);
1116
1117         if (state == INET6_IFADDR_STATE_DEAD)
1118                 goto out;
1119
1120         spin_lock_bh(&addrconf_hash_lock);
1121         hlist_del_init_rcu(&ifp->addr_lst);
1122         spin_unlock_bh(&addrconf_hash_lock);
1123
1124         write_lock_bh(&ifp->idev->lock);
1125
1126         if (ifp->flags&IFA_F_TEMPORARY) {
1127                 list_del(&ifp->tmp_list);
1128                 if (ifp->ifpub) {
1129                         in6_ifa_put(ifp->ifpub);
1130                         ifp->ifpub = NULL;
1131                 }
1132                 __in6_ifa_put(ifp);
1133         }
1134
1135         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1136                 action = check_cleanup_prefix_route(ifp, &expires);
1137
1138         list_del_init(&ifp->if_list);
1139         __in6_ifa_put(ifp);
1140
1141         write_unlock_bh(&ifp->idev->lock);
1142
1143         addrconf_del_dad_work(ifp);
1144
1145         ipv6_ifa_notify(RTM_DELADDR, ifp);
1146
1147         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1148
1149         if (action != CLEANUP_PREFIX_RT_NOP) {
1150                 cleanup_prefix_route(ifp, expires,
1151                         action == CLEANUP_PREFIX_RT_DEL);
1152         }
1153
1154         /* clean up prefsrc entries */
1155         rt6_remove_prefsrc(ifp);
1156 out:
1157         in6_ifa_put(ifp);
1158 }
1159
1160 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1161 {
1162         struct inet6_dev *idev = ifp->idev;
1163         struct in6_addr addr, *tmpaddr;
1164         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1165         unsigned long regen_advance;
1166         int tmp_plen;
1167         int ret = 0;
1168         u32 addr_flags;
1169         unsigned long now = jiffies;
1170
1171         write_lock_bh(&idev->lock);
1172         if (ift) {
1173                 spin_lock_bh(&ift->lock);
1174                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1175                 spin_unlock_bh(&ift->lock);
1176                 tmpaddr = &addr;
1177         } else {
1178                 tmpaddr = NULL;
1179         }
1180 retry:
1181         in6_dev_hold(idev);
1182         if (idev->cnf.use_tempaddr <= 0) {
1183                 write_unlock_bh(&idev->lock);
1184                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1185                 in6_dev_put(idev);
1186                 ret = -1;
1187                 goto out;
1188         }
1189         spin_lock_bh(&ifp->lock);
1190         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1191                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1192                 spin_unlock_bh(&ifp->lock);
1193                 write_unlock_bh(&idev->lock);
1194                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1195                         __func__);
1196                 in6_dev_put(idev);
1197                 ret = -1;
1198                 goto out;
1199         }
1200         in6_ifa_hold(ifp);
1201         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1202         __ipv6_try_regen_rndid(idev, tmpaddr);
1203         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1204         age = (now - ifp->tstamp) / HZ;
1205         tmp_valid_lft = min_t(__u32,
1206                               ifp->valid_lft,
1207                               idev->cnf.temp_valid_lft + age);
1208         tmp_prefered_lft = min_t(__u32,
1209                                  ifp->prefered_lft,
1210                                  idev->cnf.temp_prefered_lft + age -
1211                                  idev->cnf.max_desync_factor);
1212         tmp_plen = ifp->prefix_len;
1213         tmp_tstamp = ifp->tstamp;
1214         spin_unlock_bh(&ifp->lock);
1215
1216         regen_advance = idev->cnf.regen_max_retry *
1217                         idev->cnf.dad_transmits *
1218                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1219         write_unlock_bh(&idev->lock);
1220
1221         /* A temporary address is created only if this calculated Preferred
1222          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1223          * an implementation must not create a temporary address with a zero
1224          * Preferred Lifetime.
1225          * Use age calculation as in addrconf_verify to avoid unnecessary
1226          * temporary addresses being generated.
1227          */
1228         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1229         if (tmp_prefered_lft <= regen_advance + age) {
1230                 in6_ifa_put(ifp);
1231                 in6_dev_put(idev);
1232                 ret = -1;
1233                 goto out;
1234         }
1235
1236         addr_flags = IFA_F_TEMPORARY;
1237         /* set in addrconf_prefix_rcv() */
1238         if (ifp->flags & IFA_F_OPTIMISTIC)
1239                 addr_flags |= IFA_F_OPTIMISTIC;
1240
1241         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1242                             ipv6_addr_scope(&addr), addr_flags,
1243                             tmp_valid_lft, tmp_prefered_lft);
1244         if (IS_ERR(ift)) {
1245                 in6_ifa_put(ifp);
1246                 in6_dev_put(idev);
1247                 pr_info("%s: retry temporary address regeneration\n", __func__);
1248                 tmpaddr = &addr;
1249                 write_lock_bh(&idev->lock);
1250                 goto retry;
1251         }
1252
1253         spin_lock_bh(&ift->lock);
1254         ift->ifpub = ifp;
1255         ift->cstamp = now;
1256         ift->tstamp = tmp_tstamp;
1257         spin_unlock_bh(&ift->lock);
1258
1259         addrconf_dad_start(ift);
1260         in6_ifa_put(ift);
1261         in6_dev_put(idev);
1262 out:
1263         return ret;
1264 }
1265
1266 /*
1267  *      Choose an appropriate source address (RFC3484)
1268  */
1269 enum {
1270         IPV6_SADDR_RULE_INIT = 0,
1271         IPV6_SADDR_RULE_LOCAL,
1272         IPV6_SADDR_RULE_SCOPE,
1273         IPV6_SADDR_RULE_PREFERRED,
1274 #ifdef CONFIG_IPV6_MIP6
1275         IPV6_SADDR_RULE_HOA,
1276 #endif
1277         IPV6_SADDR_RULE_OIF,
1278         IPV6_SADDR_RULE_LABEL,
1279         IPV6_SADDR_RULE_PRIVACY,
1280         IPV6_SADDR_RULE_ORCHID,
1281         IPV6_SADDR_RULE_PREFIX,
1282 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1283         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1284 #endif
1285         IPV6_SADDR_RULE_MAX
1286 };
1287
1288 struct ipv6_saddr_score {
1289         int                     rule;
1290         int                     addr_type;
1291         struct inet6_ifaddr     *ifa;
1292         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1293         int                     scopedist;
1294         int                     matchlen;
1295 };
1296
1297 struct ipv6_saddr_dst {
1298         const struct in6_addr *addr;
1299         int ifindex;
1300         int scope;
1301         int label;
1302         unsigned int prefs;
1303 };
1304
1305 static inline int ipv6_saddr_preferred(int type)
1306 {
1307         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1308                 return 1;
1309         return 0;
1310 }
1311
1312 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1313 {
1314 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1315         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1316 #else
1317         return false;
1318 #endif
1319 }
1320
1321 static int ipv6_get_saddr_eval(struct net *net,
1322                                struct ipv6_saddr_score *score,
1323                                struct ipv6_saddr_dst *dst,
1324                                int i)
1325 {
1326         int ret;
1327
1328         if (i <= score->rule) {
1329                 switch (i) {
1330                 case IPV6_SADDR_RULE_SCOPE:
1331                         ret = score->scopedist;
1332                         break;
1333                 case IPV6_SADDR_RULE_PREFIX:
1334                         ret = score->matchlen;
1335                         break;
1336                 default:
1337                         ret = !!test_bit(i, score->scorebits);
1338                 }
1339                 goto out;
1340         }
1341
1342         switch (i) {
1343         case IPV6_SADDR_RULE_INIT:
1344                 /* Rule 0: remember if hiscore is not ready yet */
1345                 ret = !!score->ifa;
1346                 break;
1347         case IPV6_SADDR_RULE_LOCAL:
1348                 /* Rule 1: Prefer same address */
1349                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1350                 break;
1351         case IPV6_SADDR_RULE_SCOPE:
1352                 /* Rule 2: Prefer appropriate scope
1353                  *
1354                  *      ret
1355                  *       ^
1356                  *    -1 |  d 15
1357                  *    ---+--+-+---> scope
1358                  *       |
1359                  *       |             d is scope of the destination.
1360                  *  B-d  |  \
1361                  *       |   \      <- smaller scope is better if
1362                  *  B-15 |    \        if scope is enough for destination.
1363                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1364                  * d-C-1 | /
1365                  *       |/         <- greater is better
1366                  *   -C  /             if scope is not enough for destination.
1367                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1368                  *
1369                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1370                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1371                  * Assume B = 0 and we get C > 29.
1372                  */
1373                 ret = __ipv6_addr_src_scope(score->addr_type);
1374                 if (ret >= dst->scope)
1375                         ret = -ret;
1376                 else
1377                         ret -= 128;     /* 30 is enough */
1378                 score->scopedist = ret;
1379                 break;
1380         case IPV6_SADDR_RULE_PREFERRED:
1381             {
1382                 /* Rule 3: Avoid deprecated and optimistic addresses */
1383                 u8 avoid = IFA_F_DEPRECATED;
1384
1385                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1386                         avoid |= IFA_F_OPTIMISTIC;
1387                 ret = ipv6_saddr_preferred(score->addr_type) ||
1388                       !(score->ifa->flags & avoid);
1389                 break;
1390             }
1391 #ifdef CONFIG_IPV6_MIP6
1392         case IPV6_SADDR_RULE_HOA:
1393             {
1394                 /* Rule 4: Prefer home address */
1395                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1396                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1397                 break;
1398             }
1399 #endif
1400         case IPV6_SADDR_RULE_OIF:
1401                 /* Rule 5: Prefer outgoing interface */
1402                 ret = (!dst->ifindex ||
1403                        dst->ifindex == score->ifa->idev->dev->ifindex);
1404                 break;
1405         case IPV6_SADDR_RULE_LABEL:
1406                 /* Rule 6: Prefer matching label */
1407                 ret = ipv6_addr_label(net,
1408                                       &score->ifa->addr, score->addr_type,
1409                                       score->ifa->idev->dev->ifindex) == dst->label;
1410                 break;
1411         case IPV6_SADDR_RULE_PRIVACY:
1412             {
1413                 /* Rule 7: Prefer public address
1414                  * Note: prefer temporary address if use_tempaddr >= 2
1415                  */
1416                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1417                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1418                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1419                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1420                 break;
1421             }
1422         case IPV6_SADDR_RULE_ORCHID:
1423                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1424                  *          non-ORCHID vs non-ORCHID
1425                  */
1426                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1427                         ipv6_addr_orchid(dst->addr));
1428                 break;
1429         case IPV6_SADDR_RULE_PREFIX:
1430                 /* Rule 8: Use longest matching prefix */
1431                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1432                 if (ret > score->ifa->prefix_len)
1433                         ret = score->ifa->prefix_len;
1434                 score->matchlen = ret;
1435                 break;
1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1437         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1438                 /* Optimistic addresses still have lower precedence than other
1439                  * preferred addresses.
1440                  */
1441                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1442                 break;
1443 #endif
1444         default:
1445                 ret = 0;
1446         }
1447
1448         if (ret)
1449                 __set_bit(i, score->scorebits);
1450         score->rule = i;
1451 out:
1452         return ret;
1453 }
1454
1455 static int __ipv6_dev_get_saddr(struct net *net,
1456                                 struct ipv6_saddr_dst *dst,
1457                                 struct inet6_dev *idev,
1458                                 struct ipv6_saddr_score *scores,
1459                                 int hiscore_idx)
1460 {
1461         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1462
1463         read_lock_bh(&idev->lock);
1464         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1465                 int i;
1466
1467                 /*
1468                  * - Tentative Address (RFC2462 section 5.4)
1469                  *  - A tentative address is not considered
1470                  *    "assigned to an interface" in the traditional
1471                  *    sense, unless it is also flagged as optimistic.
1472                  * - Candidate Source Address (section 4)
1473                  *  - In any case, anycast addresses, multicast
1474                  *    addresses, and the unspecified address MUST
1475                  *    NOT be included in a candidate set.
1476                  */
1477                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1478                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1479                         continue;
1480
1481                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1482
1483                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1484                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1485                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1486                                             idev->dev->name);
1487                         continue;
1488                 }
1489
1490                 score->rule = -1;
1491                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1492
1493                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1494                         int minihiscore, miniscore;
1495
1496                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1497                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1498
1499                         if (minihiscore > miniscore) {
1500                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1501                                     score->scopedist > 0) {
1502                                         /*
1503                                          * special case:
1504                                          * each remaining entry
1505                                          * has too small (not enough)
1506                                          * scope, because ifa entries
1507                                          * are sorted by their scope
1508                                          * values.
1509                                          */
1510                                         goto out;
1511                                 }
1512                                 break;
1513                         } else if (minihiscore < miniscore) {
1514                                 if (hiscore->ifa)
1515                                         in6_ifa_put(hiscore->ifa);
1516
1517                                 in6_ifa_hold(score->ifa);
1518
1519                                 swap(hiscore, score);
1520                                 hiscore_idx = 1 - hiscore_idx;
1521
1522                                 /* restore our iterator */
1523                                 score->ifa = hiscore->ifa;
1524
1525                                 break;
1526                         }
1527                 }
1528         }
1529 out:
1530         read_unlock_bh(&idev->lock);
1531         return hiscore_idx;
1532 }
1533
1534 static int ipv6_get_saddr_master(struct net *net,
1535                                  const struct net_device *dst_dev,
1536                                  const struct net_device *master,
1537                                  struct ipv6_saddr_dst *dst,
1538                                  struct ipv6_saddr_score *scores,
1539                                  int hiscore_idx)
1540 {
1541         struct inet6_dev *idev;
1542
1543         idev = __in6_dev_get(dst_dev);
1544         if (idev)
1545                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1546                                                    scores, hiscore_idx);
1547
1548         idev = __in6_dev_get(master);
1549         if (idev)
1550                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1551                                                    scores, hiscore_idx);
1552
1553         return hiscore_idx;
1554 }
1555
1556 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1557                        const struct in6_addr *daddr, unsigned int prefs,
1558                        struct in6_addr *saddr)
1559 {
1560         struct ipv6_saddr_score scores[2], *hiscore;
1561         struct ipv6_saddr_dst dst;
1562         struct inet6_dev *idev;
1563         struct net_device *dev;
1564         int dst_type;
1565         bool use_oif_addr = false;
1566         int hiscore_idx = 0;
1567
1568         dst_type = __ipv6_addr_type(daddr);
1569         dst.addr = daddr;
1570         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1571         dst.scope = __ipv6_addr_src_scope(dst_type);
1572         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1573         dst.prefs = prefs;
1574
1575         scores[hiscore_idx].rule = -1;
1576         scores[hiscore_idx].ifa = NULL;
1577
1578         rcu_read_lock();
1579
1580         /* Candidate Source Address (section 4)
1581          *  - multicast and link-local destination address,
1582          *    the set of candidate source address MUST only
1583          *    include addresses assigned to interfaces
1584          *    belonging to the same link as the outgoing
1585          *    interface.
1586          * (- For site-local destination addresses, the
1587          *    set of candidate source addresses MUST only
1588          *    include addresses assigned to interfaces
1589          *    belonging to the same site as the outgoing
1590          *    interface.)
1591          *  - "It is RECOMMENDED that the candidate source addresses
1592          *    be the set of unicast addresses assigned to the
1593          *    interface that will be used to send to the destination
1594          *    (the 'outgoing' interface)." (RFC 6724)
1595          */
1596         if (dst_dev) {
1597                 idev = __in6_dev_get(dst_dev);
1598                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1599                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1600                     (idev && idev->cnf.use_oif_addrs_only)) {
1601                         use_oif_addr = true;
1602                 }
1603         }
1604
1605         if (use_oif_addr) {
1606                 if (idev)
1607                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1608         } else {
1609                 const struct net_device *master;
1610                 int master_idx = 0;
1611
1612                 /* if dst_dev exists and is enslaved to an L3 device, then
1613                  * prefer addresses from dst_dev and then the master over
1614                  * any other enslaved devices in the L3 domain.
1615                  */
1616                 master = l3mdev_master_dev_rcu(dst_dev);
1617                 if (master) {
1618                         master_idx = master->ifindex;
1619
1620                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1621                                                             master, &dst,
1622                                                             scores, hiscore_idx);
1623
1624                         if (scores[hiscore_idx].ifa)
1625                                 goto out;
1626                 }
1627
1628                 for_each_netdev_rcu(net, dev) {
1629                         /* only consider addresses on devices in the
1630                          * same L3 domain
1631                          */
1632                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1633                                 continue;
1634                         idev = __in6_dev_get(dev);
1635                         if (!idev)
1636                                 continue;
1637                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1638                 }
1639         }
1640
1641 out:
1642         rcu_read_unlock();
1643
1644         hiscore = &scores[hiscore_idx];
1645         if (!hiscore->ifa)
1646                 return -EADDRNOTAVAIL;
1647
1648         *saddr = hiscore->ifa->addr;
1649         in6_ifa_put(hiscore->ifa);
1650         return 0;
1651 }
1652 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1653
1654 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1655                       u32 banned_flags)
1656 {
1657         struct inet6_ifaddr *ifp;
1658         int err = -EADDRNOTAVAIL;
1659
1660         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1661                 if (ifp->scope > IFA_LINK)
1662                         break;
1663                 if (ifp->scope == IFA_LINK &&
1664                     !(ifp->flags & banned_flags)) {
1665                         *addr = ifp->addr;
1666                         err = 0;
1667                         break;
1668                 }
1669         }
1670         return err;
1671 }
1672
1673 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1674                     u32 banned_flags)
1675 {
1676         struct inet6_dev *idev;
1677         int err = -EADDRNOTAVAIL;
1678
1679         rcu_read_lock();
1680         idev = __in6_dev_get(dev);
1681         if (idev) {
1682                 read_lock_bh(&idev->lock);
1683                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1684                 read_unlock_bh(&idev->lock);
1685         }
1686         rcu_read_unlock();
1687         return err;
1688 }
1689
1690 static int ipv6_count_addresses(struct inet6_dev *idev)
1691 {
1692         int cnt = 0;
1693         struct inet6_ifaddr *ifp;
1694
1695         read_lock_bh(&idev->lock);
1696         list_for_each_entry(ifp, &idev->addr_list, if_list)
1697                 cnt++;
1698         read_unlock_bh(&idev->lock);
1699         return cnt;
1700 }
1701
1702 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1703                   const struct net_device *dev, int strict)
1704 {
1705         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1706 }
1707 EXPORT_SYMBOL(ipv6_chk_addr);
1708
1709 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1710                             const struct net_device *dev, int strict,
1711                             u32 banned_flags)
1712 {
1713         struct inet6_ifaddr *ifp;
1714         unsigned int hash = inet6_addr_hash(addr);
1715         u32 ifp_flags;
1716
1717         rcu_read_lock_bh();
1718         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1719                 if (!net_eq(dev_net(ifp->idev->dev), net))
1720                         continue;
1721                 /* Decouple optimistic from tentative for evaluation here.
1722                  * Ban optimistic addresses explicitly, when required.
1723                  */
1724                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1725                             ? (ifp->flags&~IFA_F_TENTATIVE)
1726                             : ifp->flags;
1727                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1728                     !(ifp_flags&banned_flags) &&
1729                     (!dev || ifp->idev->dev == dev ||
1730                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1731                         rcu_read_unlock_bh();
1732                         return 1;
1733                 }
1734         }
1735
1736         rcu_read_unlock_bh();
1737         return 0;
1738 }
1739 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1740
1741 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1742                                struct net_device *dev)
1743 {
1744         unsigned int hash = inet6_addr_hash(addr);
1745         struct inet6_ifaddr *ifp;
1746
1747         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1748                 if (!net_eq(dev_net(ifp->idev->dev), net))
1749                         continue;
1750                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1751                         if (!dev || ifp->idev->dev == dev)
1752                                 return true;
1753                 }
1754         }
1755         return false;
1756 }
1757
1758 /* Compares an address/prefix_len with addresses on device @dev.
1759  * If one is found it returns true.
1760  */
1761 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1762         const unsigned int prefix_len, struct net_device *dev)
1763 {
1764         struct inet6_dev *idev;
1765         struct inet6_ifaddr *ifa;
1766         bool ret = false;
1767
1768         rcu_read_lock();
1769         idev = __in6_dev_get(dev);
1770         if (idev) {
1771                 read_lock_bh(&idev->lock);
1772                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1773                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1774                         if (ret)
1775                                 break;
1776                 }
1777                 read_unlock_bh(&idev->lock);
1778         }
1779         rcu_read_unlock();
1780
1781         return ret;
1782 }
1783 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1784
1785 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1786 {
1787         struct inet6_dev *idev;
1788         struct inet6_ifaddr *ifa;
1789         int     onlink;
1790
1791         onlink = 0;
1792         rcu_read_lock();
1793         idev = __in6_dev_get(dev);
1794         if (idev) {
1795                 read_lock_bh(&idev->lock);
1796                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1797                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1798                                                    ifa->prefix_len);
1799                         if (onlink)
1800                                 break;
1801                 }
1802                 read_unlock_bh(&idev->lock);
1803         }
1804         rcu_read_unlock();
1805         return onlink;
1806 }
1807 EXPORT_SYMBOL(ipv6_chk_prefix);
1808
1809 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1810                                      struct net_device *dev, int strict)
1811 {
1812         struct inet6_ifaddr *ifp, *result = NULL;
1813         unsigned int hash = inet6_addr_hash(addr);
1814
1815         rcu_read_lock_bh();
1816         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1817                 if (!net_eq(dev_net(ifp->idev->dev), net))
1818                         continue;
1819                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1820                         if (!dev || ifp->idev->dev == dev ||
1821                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1822                                 result = ifp;
1823                                 in6_ifa_hold(ifp);
1824                                 break;
1825                         }
1826                 }
1827         }
1828         rcu_read_unlock_bh();
1829
1830         return result;
1831 }
1832
1833 /* Gets referenced address, destroys ifaddr */
1834
1835 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1836 {
1837         if (dad_failed)
1838                 ifp->flags |= IFA_F_DADFAILED;
1839
1840         if (ifp->flags&IFA_F_PERMANENT) {
1841                 spin_lock_bh(&ifp->lock);
1842                 addrconf_del_dad_work(ifp);
1843                 ifp->flags |= IFA_F_TENTATIVE;
1844                 spin_unlock_bh(&ifp->lock);
1845                 if (dad_failed)
1846                         ipv6_ifa_notify(0, ifp);
1847                 in6_ifa_put(ifp);
1848         } else if (ifp->flags&IFA_F_TEMPORARY) {
1849                 struct inet6_ifaddr *ifpub;
1850                 spin_lock_bh(&ifp->lock);
1851                 ifpub = ifp->ifpub;
1852                 if (ifpub) {
1853                         in6_ifa_hold(ifpub);
1854                         spin_unlock_bh(&ifp->lock);
1855                         ipv6_create_tempaddr(ifpub, ifp);
1856                         in6_ifa_put(ifpub);
1857                 } else {
1858                         spin_unlock_bh(&ifp->lock);
1859                 }
1860                 ipv6_del_addr(ifp);
1861         } else {
1862                 ipv6_del_addr(ifp);
1863         }
1864 }
1865
1866 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1867 {
1868         int err = -ENOENT;
1869
1870         spin_lock_bh(&ifp->lock);
1871         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1872                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1873                 err = 0;
1874         }
1875         spin_unlock_bh(&ifp->lock);
1876
1877         return err;
1878 }
1879
1880 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1881 {
1882         struct inet6_dev *idev = ifp->idev;
1883         struct net *net = dev_net(ifp->idev->dev);
1884
1885         if (addrconf_dad_end(ifp)) {
1886                 in6_ifa_put(ifp);
1887                 return;
1888         }
1889
1890         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1891                              ifp->idev->dev->name, &ifp->addr);
1892
1893         spin_lock_bh(&ifp->lock);
1894
1895         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1896                 int scope = ifp->scope;
1897                 u32 flags = ifp->flags;
1898                 struct in6_addr new_addr;
1899                 struct inet6_ifaddr *ifp2;
1900                 u32 valid_lft, preferred_lft;
1901                 int pfxlen = ifp->prefix_len;
1902                 int retries = ifp->stable_privacy_retry + 1;
1903
1904                 if (retries > net->ipv6.sysctl.idgen_retries) {
1905                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1906                                              ifp->idev->dev->name);
1907                         goto errdad;
1908                 }
1909
1910                 new_addr = ifp->addr;
1911                 if (ipv6_generate_stable_address(&new_addr, retries,
1912                                                  idev))
1913                         goto errdad;
1914
1915                 valid_lft = ifp->valid_lft;
1916                 preferred_lft = ifp->prefered_lft;
1917
1918                 spin_unlock_bh(&ifp->lock);
1919
1920                 if (idev->cnf.max_addresses &&
1921                     ipv6_count_addresses(idev) >=
1922                     idev->cnf.max_addresses)
1923                         goto lock_errdad;
1924
1925                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1926                                      ifp->idev->dev->name);
1927
1928                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1929                                      scope, flags, valid_lft,
1930                                      preferred_lft);
1931                 if (IS_ERR(ifp2))
1932                         goto lock_errdad;
1933
1934                 spin_lock_bh(&ifp2->lock);
1935                 ifp2->stable_privacy_retry = retries;
1936                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1937                 spin_unlock_bh(&ifp2->lock);
1938
1939                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1940                 in6_ifa_put(ifp2);
1941 lock_errdad:
1942                 spin_lock_bh(&ifp->lock);
1943         }
1944
1945 errdad:
1946         /* transition from _POSTDAD to _ERRDAD */
1947         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1948         spin_unlock_bh(&ifp->lock);
1949
1950         addrconf_mod_dad_work(ifp, 0);
1951 }
1952
1953 /* Join to solicited addr multicast group.
1954  * caller must hold RTNL */
1955 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1956 {
1957         struct in6_addr maddr;
1958
1959         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1960                 return;
1961
1962         addrconf_addr_solict_mult(addr, &maddr);
1963         ipv6_dev_mc_inc(dev, &maddr);
1964 }
1965
1966 /* caller must hold RTNL */
1967 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1968 {
1969         struct in6_addr maddr;
1970
1971         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1972                 return;
1973
1974         addrconf_addr_solict_mult(addr, &maddr);
1975         __ipv6_dev_mc_dec(idev, &maddr);
1976 }
1977
1978 /* caller must hold RTNL */
1979 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1980 {
1981         struct in6_addr addr;
1982
1983         if (ifp->prefix_len >= 127) /* RFC 6164 */
1984                 return;
1985         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1986         if (ipv6_addr_any(&addr))
1987                 return;
1988         __ipv6_dev_ac_inc(ifp->idev, &addr);
1989 }
1990
1991 /* caller must hold RTNL */
1992 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1993 {
1994         struct in6_addr addr;
1995
1996         if (ifp->prefix_len >= 127) /* RFC 6164 */
1997                 return;
1998         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1999         if (ipv6_addr_any(&addr))
2000                 return;
2001         __ipv6_dev_ac_dec(ifp->idev, &addr);
2002 }
2003
2004 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2005 {
2006         if (dev->addr_len != EUI64_ADDR_LEN)
2007                 return -1;
2008         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2009         eui[0] ^= 2;
2010         return 0;
2011 }
2012
2013 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2014 {
2015         union fwnet_hwaddr *ha;
2016
2017         if (dev->addr_len != FWNET_ALEN)
2018                 return -1;
2019
2020         ha = (union fwnet_hwaddr *)dev->dev_addr;
2021
2022         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2023         eui[0] ^= 2;
2024         return 0;
2025 }
2026
2027 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2028 {
2029         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2030         if (dev->addr_len != ARCNET_ALEN)
2031                 return -1;
2032         memset(eui, 0, 7);
2033         eui[7] = *(u8 *)dev->dev_addr;
2034         return 0;
2035 }
2036
2037 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2038 {
2039         if (dev->addr_len != INFINIBAND_ALEN)
2040                 return -1;
2041         memcpy(eui, dev->dev_addr + 12, 8);
2042         eui[0] |= 2;
2043         return 0;
2044 }
2045
2046 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2047 {
2048         if (addr == 0)
2049                 return -1;
2050         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2051                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2052                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2053                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2054                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2055                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2056         eui[1] = 0;
2057         eui[2] = 0x5E;
2058         eui[3] = 0xFE;
2059         memcpy(eui + 4, &addr, 4);
2060         return 0;
2061 }
2062
2063 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2064 {
2065         if (dev->priv_flags & IFF_ISATAP)
2066                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2067         return -1;
2068 }
2069
2070 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2071 {
2072         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2073 }
2074
2075 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2076 {
2077         memcpy(eui, dev->perm_addr, 3);
2078         memcpy(eui + 5, dev->perm_addr + 3, 3);
2079         eui[3] = 0xFF;
2080         eui[4] = 0xFE;
2081         eui[0] ^= 2;
2082         return 0;
2083 }
2084
2085 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2086 {
2087         switch (dev->type) {
2088         case ARPHRD_ETHER:
2089         case ARPHRD_FDDI:
2090                 return addrconf_ifid_eui48(eui, dev);
2091         case ARPHRD_ARCNET:
2092                 return addrconf_ifid_arcnet(eui, dev);
2093         case ARPHRD_INFINIBAND:
2094                 return addrconf_ifid_infiniband(eui, dev);
2095         case ARPHRD_SIT:
2096                 return addrconf_ifid_sit(eui, dev);
2097         case ARPHRD_IPGRE:
2098                 return addrconf_ifid_gre(eui, dev);
2099         case ARPHRD_6LOWPAN:
2100                 return addrconf_ifid_eui64(eui, dev);
2101         case ARPHRD_IEEE1394:
2102                 return addrconf_ifid_ieee1394(eui, dev);
2103         case ARPHRD_TUNNEL6:
2104                 return addrconf_ifid_ip6tnl(eui, dev);
2105         }
2106         return -1;
2107 }
2108
2109 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2110 {
2111         int err = -1;
2112         struct inet6_ifaddr *ifp;
2113
2114         read_lock_bh(&idev->lock);
2115         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2116                 if (ifp->scope > IFA_LINK)
2117                         break;
2118                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2119                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2120                         err = 0;
2121                         break;
2122                 }
2123         }
2124         read_unlock_bh(&idev->lock);
2125         return err;
2126 }
2127
2128 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2129 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2130 {
2131 regen:
2132         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2133         idev->rndid[0] &= ~0x02;
2134
2135         /*
2136          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2137          * check if generated address is not inappropriate
2138          *
2139          *  - Reserved subnet anycast (RFC 2526)
2140          *      11111101 11....11 1xxxxxxx
2141          *  - ISATAP (RFC4214) 6.1
2142          *      00-00-5E-FE-xx-xx-xx-xx
2143          *  - value 0
2144          *  - XXX: already assigned to an address on the device
2145          */
2146         if (idev->rndid[0] == 0xfd &&
2147             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2148             (idev->rndid[7]&0x80))
2149                 goto regen;
2150         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2151                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2152                         goto regen;
2153                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2154                         goto regen;
2155         }
2156 }
2157
2158 static void ipv6_regen_rndid(unsigned long data)
2159 {
2160         struct inet6_dev *idev = (struct inet6_dev *) data;
2161         unsigned long expires;
2162
2163         rcu_read_lock_bh();
2164         write_lock_bh(&idev->lock);
2165
2166         if (idev->dead)
2167                 goto out;
2168
2169         __ipv6_regen_rndid(idev);
2170
2171         expires = jiffies +
2172                 idev->cnf.temp_prefered_lft * HZ -
2173                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2174                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2175                 idev->cnf.max_desync_factor * HZ;
2176         if (time_before(expires, jiffies)) {
2177                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2178                         __func__, idev->dev->name);
2179                 goto out;
2180         }
2181
2182         if (!mod_timer(&idev->regen_timer, expires))
2183                 in6_dev_hold(idev);
2184
2185 out:
2186         write_unlock_bh(&idev->lock);
2187         rcu_read_unlock_bh();
2188         in6_dev_put(idev);
2189 }
2190
2191 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2192 {
2193         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2194                 __ipv6_regen_rndid(idev);
2195 }
2196
2197 /*
2198  *      Add prefix route.
2199  */
2200
2201 static void
2202 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2203                       unsigned long expires, u32 flags)
2204 {
2205         struct fib6_config cfg = {
2206                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2207                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2208                 .fc_ifindex = dev->ifindex,
2209                 .fc_expires = expires,
2210                 .fc_dst_len = plen,
2211                 .fc_flags = RTF_UP | flags,
2212                 .fc_nlinfo.nl_net = dev_net(dev),
2213                 .fc_protocol = RTPROT_KERNEL,
2214         };
2215
2216         cfg.fc_dst = *pfx;
2217
2218         /* Prevent useless cloning on PtP SIT.
2219            This thing is done here expecting that the whole
2220            class of non-broadcast devices need not cloning.
2221          */
2222 #if IS_ENABLED(CONFIG_IPV6_SIT)
2223         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2224                 cfg.fc_flags |= RTF_NONEXTHOP;
2225 #endif
2226
2227         ip6_route_add(&cfg);
2228 }
2229
2230
2231 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2232                                                   int plen,
2233                                                   const struct net_device *dev,
2234                                                   u32 flags, u32 noflags)
2235 {
2236         struct fib6_node *fn;
2237         struct rt6_info *rt = NULL;
2238         struct fib6_table *table;
2239         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2240
2241         table = fib6_get_table(dev_net(dev), tb_id);
2242         if (!table)
2243                 return NULL;
2244
2245         read_lock_bh(&table->tb6_lock);
2246         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2247         if (!fn)
2248                 goto out;
2249
2250         noflags |= RTF_CACHE;
2251         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2252                 if (rt->dst.dev->ifindex != dev->ifindex)
2253                         continue;
2254                 if ((rt->rt6i_flags & flags) != flags)
2255                         continue;
2256                 if ((rt->rt6i_flags & noflags) != 0)
2257                         continue;
2258                 dst_hold(&rt->dst);
2259                 break;
2260         }
2261 out:
2262         read_unlock_bh(&table->tb6_lock);
2263         return rt;
2264 }
2265
2266
2267 /* Create "default" multicast route to the interface */
2268
2269 static void addrconf_add_mroute(struct net_device *dev)
2270 {
2271         struct fib6_config cfg = {
2272                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2273                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2274                 .fc_ifindex = dev->ifindex,
2275                 .fc_dst_len = 8,
2276                 .fc_flags = RTF_UP,
2277                 .fc_nlinfo.nl_net = dev_net(dev),
2278         };
2279
2280         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2281
2282         ip6_route_add(&cfg);
2283 }
2284
2285 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2286 {
2287         struct inet6_dev *idev;
2288
2289         ASSERT_RTNL();
2290
2291         idev = ipv6_find_idev(dev);
2292         if (!idev)
2293                 return ERR_PTR(-ENOBUFS);
2294
2295         if (idev->cnf.disable_ipv6)
2296                 return ERR_PTR(-EACCES);
2297
2298         /* Add default multicast route */
2299         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2300                 addrconf_add_mroute(dev);
2301
2302         return idev;
2303 }
2304
2305 static void manage_tempaddrs(struct inet6_dev *idev,
2306                              struct inet6_ifaddr *ifp,
2307                              __u32 valid_lft, __u32 prefered_lft,
2308                              bool create, unsigned long now)
2309 {
2310         u32 flags;
2311         struct inet6_ifaddr *ift;
2312
2313         read_lock_bh(&idev->lock);
2314         /* update all temporary addresses in the list */
2315         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2316                 int age, max_valid, max_prefered;
2317
2318                 if (ifp != ift->ifpub)
2319                         continue;
2320
2321                 /* RFC 4941 section 3.3:
2322                  * If a received option will extend the lifetime of a public
2323                  * address, the lifetimes of temporary addresses should
2324                  * be extended, subject to the overall constraint that no
2325                  * temporary addresses should ever remain "valid" or "preferred"
2326                  * for a time longer than (TEMP_VALID_LIFETIME) or
2327                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2328                  */
2329                 age = (now - ift->cstamp) / HZ;
2330                 max_valid = idev->cnf.temp_valid_lft - age;
2331                 if (max_valid < 0)
2332                         max_valid = 0;
2333
2334                 max_prefered = idev->cnf.temp_prefered_lft -
2335                                idev->cnf.max_desync_factor - age;
2336                 if (max_prefered < 0)
2337                         max_prefered = 0;
2338
2339                 if (valid_lft > max_valid)
2340                         valid_lft = max_valid;
2341
2342                 if (prefered_lft > max_prefered)
2343                         prefered_lft = max_prefered;
2344
2345                 spin_lock(&ift->lock);
2346                 flags = ift->flags;
2347                 ift->valid_lft = valid_lft;
2348                 ift->prefered_lft = prefered_lft;
2349                 ift->tstamp = now;
2350                 if (prefered_lft > 0)
2351                         ift->flags &= ~IFA_F_DEPRECATED;
2352
2353                 spin_unlock(&ift->lock);
2354                 if (!(flags&IFA_F_TENTATIVE))
2355                         ipv6_ifa_notify(0, ift);
2356         }
2357
2358         if ((create || list_empty(&idev->tempaddr_list)) &&
2359             idev->cnf.use_tempaddr > 0) {
2360                 /* When a new public address is created as described
2361                  * in [ADDRCONF], also create a new temporary address.
2362                  * Also create a temporary address if it's enabled but
2363                  * no temporary address currently exists.
2364                  */
2365                 read_unlock_bh(&idev->lock);
2366                 ipv6_create_tempaddr(ifp, NULL);
2367         } else {
2368                 read_unlock_bh(&idev->lock);
2369         }
2370 }
2371
2372 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2373 {
2374         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2375                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2376 }
2377
2378 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2379                                  const struct prefix_info *pinfo,
2380                                  struct inet6_dev *in6_dev,
2381                                  const struct in6_addr *addr, int addr_type,
2382                                  u32 addr_flags, bool sllao, bool tokenized,
2383                                  __u32 valid_lft, u32 prefered_lft)
2384 {
2385         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2386         int create = 0, update_lft = 0;
2387
2388         if (!ifp && valid_lft) {
2389                 int max_addresses = in6_dev->cnf.max_addresses;
2390
2391 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2392                 if (in6_dev->cnf.optimistic_dad &&
2393                     !net->ipv6.devconf_all->forwarding && sllao)
2394                         addr_flags |= IFA_F_OPTIMISTIC;
2395 #endif
2396
2397                 /* Do not allow to create too much of autoconfigured
2398                  * addresses; this would be too easy way to crash kernel.
2399                  */
2400                 if (!max_addresses ||
2401                     ipv6_count_addresses(in6_dev) < max_addresses)
2402                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2403                                             pinfo->prefix_len,
2404                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2405                                             addr_flags, valid_lft,
2406                                             prefered_lft);
2407
2408                 if (IS_ERR_OR_NULL(ifp))
2409                         return -1;
2410
2411                 update_lft = 0;
2412                 create = 1;
2413                 spin_lock_bh(&ifp->lock);
2414                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2415                 ifp->cstamp = jiffies;
2416                 ifp->tokenized = tokenized;
2417                 spin_unlock_bh(&ifp->lock);
2418                 addrconf_dad_start(ifp);
2419         }
2420
2421         if (ifp) {
2422                 u32 flags;
2423                 unsigned long now;
2424                 u32 stored_lft;
2425
2426                 /* update lifetime (RFC2462 5.5.3 e) */
2427                 spin_lock_bh(&ifp->lock);
2428                 now = jiffies;
2429                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2430                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2431                 else
2432                         stored_lft = 0;
2433                 if (!update_lft && !create && stored_lft) {
2434                         const u32 minimum_lft = min_t(u32,
2435                                 stored_lft, MIN_VALID_LIFETIME);
2436                         valid_lft = max(valid_lft, minimum_lft);
2437
2438                         /* RFC4862 Section 5.5.3e:
2439                          * "Note that the preferred lifetime of the
2440                          *  corresponding address is always reset to
2441                          *  the Preferred Lifetime in the received
2442                          *  Prefix Information option, regardless of
2443                          *  whether the valid lifetime is also reset or
2444                          *  ignored."
2445                          *
2446                          * So we should always update prefered_lft here.
2447                          */
2448                         update_lft = 1;
2449                 }
2450
2451                 if (update_lft) {
2452                         ifp->valid_lft = valid_lft;
2453                         ifp->prefered_lft = prefered_lft;
2454                         ifp->tstamp = now;
2455                         flags = ifp->flags;
2456                         ifp->flags &= ~IFA_F_DEPRECATED;
2457                         spin_unlock_bh(&ifp->lock);
2458
2459                         if (!(flags&IFA_F_TENTATIVE))
2460                                 ipv6_ifa_notify(0, ifp);
2461                 } else
2462                         spin_unlock_bh(&ifp->lock);
2463
2464                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2465                                  create, now);
2466
2467                 in6_ifa_put(ifp);
2468                 addrconf_verify();
2469         }
2470
2471         return 0;
2472 }
2473 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2474
2475 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2476 {
2477         struct prefix_info *pinfo;
2478         __u32 valid_lft;
2479         __u32 prefered_lft;
2480         int addr_type, err;
2481         u32 addr_flags = 0;
2482         struct inet6_dev *in6_dev;
2483         struct net *net = dev_net(dev);
2484
2485         pinfo = (struct prefix_info *) opt;
2486
2487         if (len < sizeof(struct prefix_info)) {
2488                 ADBG("addrconf: prefix option too short\n");
2489                 return;
2490         }
2491
2492         /*
2493          *      Validation checks ([ADDRCONF], page 19)
2494          */
2495
2496         addr_type = ipv6_addr_type(&pinfo->prefix);
2497
2498         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2499                 return;
2500
2501         valid_lft = ntohl(pinfo->valid);
2502         prefered_lft = ntohl(pinfo->prefered);
2503
2504         if (prefered_lft > valid_lft) {
2505                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2506                 return;
2507         }
2508
2509         in6_dev = in6_dev_get(dev);
2510
2511         if (!in6_dev) {
2512                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2513                                     dev->name);
2514                 return;
2515         }
2516
2517         /*
2518          *      Two things going on here:
2519          *      1) Add routes for on-link prefixes
2520          *      2) Configure prefixes with the auto flag set
2521          */
2522
2523         if (pinfo->onlink) {
2524                 struct rt6_info *rt;
2525                 unsigned long rt_expires;
2526
2527                 /* Avoid arithmetic overflow. Really, we could
2528                  * save rt_expires in seconds, likely valid_lft,
2529                  * but it would require division in fib gc, that it
2530                  * not good.
2531                  */
2532                 if (HZ > USER_HZ)
2533                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2534                 else
2535                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2536
2537                 if (addrconf_finite_timeout(rt_expires))
2538                         rt_expires *= HZ;
2539
2540                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2541                                                pinfo->prefix_len,
2542                                                dev,
2543                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2544                                                RTF_GATEWAY | RTF_DEFAULT);
2545
2546                 if (rt) {
2547                         /* Autoconf prefix route */
2548                         if (valid_lft == 0) {
2549                                 ip6_del_rt(rt);
2550                                 rt = NULL;
2551                         } else if (addrconf_finite_timeout(rt_expires)) {
2552                                 /* not infinity */
2553                                 rt6_set_expires(rt, jiffies + rt_expires);
2554                         } else {
2555                                 rt6_clean_expires(rt);
2556                         }
2557                 } else if (valid_lft) {
2558                         clock_t expires = 0;
2559                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2560                         if (addrconf_finite_timeout(rt_expires)) {
2561                                 /* not infinity */
2562                                 flags |= RTF_EXPIRES;
2563                                 expires = jiffies_to_clock_t(rt_expires);
2564                         }
2565                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2566                                               dev, expires, flags);
2567                 }
2568                 ip6_rt_put(rt);
2569         }
2570
2571         /* Try to figure out our local address for this prefix */
2572
2573         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2574                 struct in6_addr addr;
2575                 bool tokenized = false, dev_addr_generated = false;
2576
2577                 if (pinfo->prefix_len == 64) {
2578                         memcpy(&addr, &pinfo->prefix, 8);
2579
2580                         if (!ipv6_addr_any(&in6_dev->token)) {
2581                                 read_lock_bh(&in6_dev->lock);
2582                                 memcpy(addr.s6_addr + 8,
2583                                        in6_dev->token.s6_addr + 8, 8);
2584                                 read_unlock_bh(&in6_dev->lock);
2585                                 tokenized = true;
2586                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2587                                    !ipv6_generate_stable_address(&addr, 0,
2588                                                                  in6_dev)) {
2589                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2590                                 goto ok;
2591                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2592                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2593                                 goto put;
2594                         } else {
2595                                 dev_addr_generated = true;
2596                         }
2597                         goto ok;
2598                 }
2599                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2600                                     pinfo->prefix_len);
2601                 goto put;
2602
2603 ok:
2604                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2605                                                    &addr, addr_type,
2606                                                    addr_flags, sllao,
2607                                                    tokenized, valid_lft,
2608                                                    prefered_lft);
2609                 if (err)
2610                         goto put;
2611
2612                 /* Ignore error case here because previous prefix add addr was
2613                  * successful which will be notified.
2614                  */
2615                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2616                                               addr_type, addr_flags, sllao,
2617                                               tokenized, valid_lft,
2618                                               prefered_lft,
2619                                               dev_addr_generated);
2620         }
2621         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2622 put:
2623         in6_dev_put(in6_dev);
2624 }
2625
2626 /*
2627  *      Set destination address.
2628  *      Special case for SIT interfaces where we create a new "virtual"
2629  *      device.
2630  */
2631 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2632 {
2633         struct in6_ifreq ireq;
2634         struct net_device *dev;
2635         int err = -EINVAL;
2636
2637         rtnl_lock();
2638
2639         err = -EFAULT;
2640         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2641                 goto err_exit;
2642
2643         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2644
2645         err = -ENODEV;
2646         if (!dev)
2647                 goto err_exit;
2648
2649 #if IS_ENABLED(CONFIG_IPV6_SIT)
2650         if (dev->type == ARPHRD_SIT) {
2651                 const struct net_device_ops *ops = dev->netdev_ops;
2652                 struct ifreq ifr;
2653                 struct ip_tunnel_parm p;
2654
2655                 err = -EADDRNOTAVAIL;
2656                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2657                         goto err_exit;
2658
2659                 memset(&p, 0, sizeof(p));
2660                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2661                 p.iph.saddr = 0;
2662                 p.iph.version = 4;
2663                 p.iph.ihl = 5;
2664                 p.iph.protocol = IPPROTO_IPV6;
2665                 p.iph.ttl = 64;
2666                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2667
2668                 if (ops->ndo_do_ioctl) {
2669                         mm_segment_t oldfs = get_fs();
2670
2671                         set_fs(KERNEL_DS);
2672                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2673                         set_fs(oldfs);
2674                 } else
2675                         err = -EOPNOTSUPP;
2676
2677                 if (err == 0) {
2678                         err = -ENOBUFS;
2679                         dev = __dev_get_by_name(net, p.name);
2680                         if (!dev)
2681                                 goto err_exit;
2682                         err = dev_open(dev);
2683                 }
2684         }
2685 #endif
2686
2687 err_exit:
2688         rtnl_unlock();
2689         return err;
2690 }
2691
2692 static int ipv6_mc_config(struct sock *sk, bool join,
2693                           const struct in6_addr *addr, int ifindex)
2694 {
2695         int ret;
2696
2697         ASSERT_RTNL();
2698
2699         lock_sock(sk);
2700         if (join)
2701                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2702         else
2703                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2704         release_sock(sk);
2705
2706         return ret;
2707 }
2708
2709 /*
2710  *      Manual configuration of address on an interface
2711  */
2712 static int inet6_addr_add(struct net *net, int ifindex,
2713                           const struct in6_addr *pfx,
2714                           const struct in6_addr *peer_pfx,
2715                           unsigned int plen, __u32 ifa_flags,
2716                           __u32 prefered_lft, __u32 valid_lft)
2717 {
2718         struct inet6_ifaddr *ifp;
2719         struct inet6_dev *idev;
2720         struct net_device *dev;
2721         unsigned long timeout;
2722         clock_t expires;
2723         int scope;
2724         u32 flags;
2725
2726         ASSERT_RTNL();
2727
2728         if (plen > 128)
2729                 return -EINVAL;
2730
2731         /* check the lifetime */
2732         if (!valid_lft || prefered_lft > valid_lft)
2733                 return -EINVAL;
2734
2735         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2736                 return -EINVAL;
2737
2738         dev = __dev_get_by_index(net, ifindex);
2739         if (!dev)
2740                 return -ENODEV;
2741
2742         idev = addrconf_add_dev(dev);
2743         if (IS_ERR(idev))
2744                 return PTR_ERR(idev);
2745
2746         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2747                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2748                                          true, pfx, ifindex);
2749
2750                 if (ret < 0)
2751                         return ret;
2752         }
2753
2754         scope = ipv6_addr_scope(pfx);
2755
2756         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2757         if (addrconf_finite_timeout(timeout)) {
2758                 expires = jiffies_to_clock_t(timeout * HZ);
2759                 valid_lft = timeout;
2760                 flags = RTF_EXPIRES;
2761         } else {
2762                 expires = 0;
2763                 flags = 0;
2764                 ifa_flags |= IFA_F_PERMANENT;
2765         }
2766
2767         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2768         if (addrconf_finite_timeout(timeout)) {
2769                 if (timeout == 0)
2770                         ifa_flags |= IFA_F_DEPRECATED;
2771                 prefered_lft = timeout;
2772         }
2773
2774         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2775                             valid_lft, prefered_lft);
2776
2777         if (!IS_ERR(ifp)) {
2778                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2779                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2780                                               expires, flags);
2781                 }
2782
2783                 /*
2784                  * Note that section 3.1 of RFC 4429 indicates
2785                  * that the Optimistic flag should not be set for
2786                  * manually configured addresses
2787                  */
2788                 addrconf_dad_start(ifp);
2789                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2790                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2791                                          true, jiffies);
2792                 in6_ifa_put(ifp);
2793                 addrconf_verify_rtnl();
2794                 return 0;
2795         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2796                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2797                                false, pfx, ifindex);
2798         }
2799
2800         return PTR_ERR(ifp);
2801 }
2802
2803 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2804                           const struct in6_addr *pfx, unsigned int plen)
2805 {
2806         struct inet6_ifaddr *ifp;
2807         struct inet6_dev *idev;
2808         struct net_device *dev;
2809
2810         if (plen > 128)
2811                 return -EINVAL;
2812
2813         dev = __dev_get_by_index(net, ifindex);
2814         if (!dev)
2815                 return -ENODEV;
2816
2817         idev = __in6_dev_get(dev);
2818         if (!idev)
2819                 return -ENXIO;
2820
2821         read_lock_bh(&idev->lock);
2822         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2823                 if (ifp->prefix_len == plen &&
2824                     ipv6_addr_equal(pfx, &ifp->addr)) {
2825                         in6_ifa_hold(ifp);
2826                         read_unlock_bh(&idev->lock);
2827
2828                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2829                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2830                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2831                                                  jiffies);
2832                         ipv6_del_addr(ifp);
2833                         addrconf_verify_rtnl();
2834                         if (ipv6_addr_is_multicast(pfx)) {
2835                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2836                                                false, pfx, dev->ifindex);
2837                         }
2838                         return 0;
2839                 }
2840         }
2841         read_unlock_bh(&idev->lock);
2842         return -EADDRNOTAVAIL;
2843 }
2844
2845
2846 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2847 {
2848         struct in6_ifreq ireq;
2849         int err;
2850
2851         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2852                 return -EPERM;
2853
2854         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2855                 return -EFAULT;
2856
2857         rtnl_lock();
2858         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2859                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2860                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2861         rtnl_unlock();
2862         return err;
2863 }
2864
2865 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2866 {
2867         struct in6_ifreq ireq;
2868         int err;
2869
2870         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2871                 return -EPERM;
2872
2873         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2874                 return -EFAULT;
2875
2876         rtnl_lock();
2877         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2878                              ireq.ifr6_prefixlen);
2879         rtnl_unlock();
2880         return err;
2881 }
2882
2883 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2884                      int plen, int scope)
2885 {
2886         struct inet6_ifaddr *ifp;
2887
2888         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2889                             scope, IFA_F_PERMANENT,
2890                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2891         if (!IS_ERR(ifp)) {
2892                 spin_lock_bh(&ifp->lock);
2893                 ifp->flags &= ~IFA_F_TENTATIVE;
2894                 spin_unlock_bh(&ifp->lock);
2895                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2896                 in6_ifa_put(ifp);
2897         }
2898 }
2899
2900 #if IS_ENABLED(CONFIG_IPV6_SIT)
2901 static void sit_add_v4_addrs(struct inet6_dev *idev)
2902 {
2903         struct in6_addr addr;
2904         struct net_device *dev;
2905         struct net *net = dev_net(idev->dev);
2906         int scope, plen;
2907         u32 pflags = 0;
2908
2909         ASSERT_RTNL();
2910
2911         memset(&addr, 0, sizeof(struct in6_addr));
2912         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2913
2914         if (idev->dev->flags&IFF_POINTOPOINT) {
2915                 addr.s6_addr32[0] = htonl(0xfe800000);
2916                 scope = IFA_LINK;
2917                 plen = 64;
2918         } else {
2919                 scope = IPV6_ADDR_COMPATv4;
2920                 plen = 96;
2921                 pflags |= RTF_NONEXTHOP;
2922         }
2923
2924         if (addr.s6_addr32[3]) {
2925                 add_addr(idev, &addr, plen, scope);
2926                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2927                 return;
2928         }
2929
2930         for_each_netdev(net, dev) {
2931                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2932                 if (in_dev && (dev->flags & IFF_UP)) {
2933                         struct in_ifaddr *ifa;
2934
2935                         int flag = scope;
2936
2937                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2938
2939                                 addr.s6_addr32[3] = ifa->ifa_local;
2940
2941                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2942                                         continue;
2943                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2944                                         if (idev->dev->flags&IFF_POINTOPOINT)
2945                                                 continue;
2946                                         flag |= IFA_HOST;
2947                                 }
2948
2949                                 add_addr(idev, &addr, plen, flag);
2950                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2951                                                       pflags);
2952                         }
2953                 }
2954         }
2955 }
2956 #endif
2957
2958 static void init_loopback(struct net_device *dev)
2959 {
2960         struct inet6_dev  *idev;
2961         struct net_device *sp_dev;
2962         struct inet6_ifaddr *sp_ifa;
2963         struct rt6_info *sp_rt;
2964
2965         /* ::1 */
2966
2967         ASSERT_RTNL();
2968
2969         idev = ipv6_find_idev(dev);
2970         if (!idev) {
2971                 pr_debug("%s: add_dev failed\n", __func__);
2972                 return;
2973         }
2974
2975         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2976
2977         /* Add routes to other interface's IPv6 addresses */
2978         for_each_netdev(dev_net(dev), sp_dev) {
2979                 if (!strcmp(sp_dev->name, dev->name))
2980                         continue;
2981
2982                 idev = __in6_dev_get(sp_dev);
2983                 if (!idev)
2984                         continue;
2985
2986                 read_lock_bh(&idev->lock);
2987                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2988
2989                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2990                                 continue;
2991
2992                         if (sp_ifa->rt) {
2993                                 /* This dst has been added to garbage list when
2994                                  * lo device down, release this obsolete dst and
2995                                  * reallocate a new router for ifa.
2996                                  */
2997                                 if (sp_ifa->rt->dst.obsolete > 0) {
2998                                         ip6_rt_put(sp_ifa->rt);
2999                                         sp_ifa->rt = NULL;
3000                                 } else {
3001                                         continue;
3002                                 }
3003                         }
3004
3005                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3006
3007                         /* Failure cases are ignored */
3008                         if (!IS_ERR(sp_rt)) {
3009                                 sp_ifa->rt = sp_rt;
3010                                 ip6_ins_rt(sp_rt);
3011                         }
3012                 }
3013                 read_unlock_bh(&idev->lock);
3014         }
3015 }
3016
3017 void addrconf_add_linklocal(struct inet6_dev *idev,
3018                             const struct in6_addr *addr, u32 flags)
3019 {
3020         struct inet6_ifaddr *ifp;
3021         u32 addr_flags = flags | IFA_F_PERMANENT;
3022
3023 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3024         if (idev->cnf.optimistic_dad &&
3025             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3026                 addr_flags |= IFA_F_OPTIMISTIC;
3027 #endif
3028
3029         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3030                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3031         if (!IS_ERR(ifp)) {
3032                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3033                 addrconf_dad_start(ifp);
3034                 in6_ifa_put(ifp);
3035         }
3036 }
3037 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3038
3039 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3040 {
3041         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3042                 return true;
3043
3044         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3045             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3046                 return true;
3047
3048         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3049             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3050                 return true;
3051
3052         return false;
3053 }
3054
3055 static int ipv6_generate_stable_address(struct in6_addr *address,
3056                                         u8 dad_count,
3057                                         const struct inet6_dev *idev)
3058 {
3059         static DEFINE_SPINLOCK(lock);
3060         static __u32 digest[SHA_DIGEST_WORDS];
3061         static __u32 workspace[SHA_WORKSPACE_WORDS];
3062
3063         static union {
3064                 char __data[SHA_MESSAGE_BYTES];
3065                 struct {
3066                         struct in6_addr secret;
3067                         __be32 prefix[2];
3068                         unsigned char hwaddr[MAX_ADDR_LEN];
3069                         u8 dad_count;
3070                 } __packed;
3071         } data;
3072
3073         struct in6_addr secret;
3074         struct in6_addr temp;
3075         struct net *net = dev_net(idev->dev);
3076
3077         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3078
3079         if (idev->cnf.stable_secret.initialized)
3080                 secret = idev->cnf.stable_secret.secret;
3081         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3082                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3083         else
3084                 return -1;
3085
3086 retry:
3087         spin_lock_bh(&lock);
3088
3089         sha_init(digest);
3090         memset(&data, 0, sizeof(data));
3091         memset(workspace, 0, sizeof(workspace));
3092         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3093         data.prefix[0] = address->s6_addr32[0];
3094         data.prefix[1] = address->s6_addr32[1];
3095         data.secret = secret;
3096         data.dad_count = dad_count;
3097
3098         sha_transform(digest, data.__data, workspace);
3099
3100         temp = *address;
3101         temp.s6_addr32[2] = (__force __be32)digest[0];
3102         temp.s6_addr32[3] = (__force __be32)digest[1];
3103
3104         spin_unlock_bh(&lock);
3105
3106         if (ipv6_reserved_interfaceid(temp)) {
3107                 dad_count++;
3108                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3109                         return -1;
3110                 goto retry;
3111         }
3112
3113         *address = temp;
3114         return 0;
3115 }
3116
3117 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3118 {
3119         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3120
3121         if (s->initialized)
3122                 return;
3123         s = &idev->cnf.stable_secret;
3124         get_random_bytes(&s->secret, sizeof(s->secret));
3125         s->initialized = true;
3126 }
3127
3128 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3129 {
3130         struct in6_addr addr;
3131
3132         /* no link local addresses on L3 master devices */
3133         if (netif_is_l3_master(idev->dev))
3134                 return;
3135
3136         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3137
3138         switch (idev->addr_gen_mode) {
3139         case IN6_ADDR_GEN_MODE_RANDOM:
3140                 ipv6_gen_mode_random_init(idev);
3141                 /* fallthrough */
3142         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3143                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3144                         addrconf_add_linklocal(idev, &addr,
3145                                                IFA_F_STABLE_PRIVACY);
3146                 else if (prefix_route)
3147                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3148                 break;
3149         case IN6_ADDR_GEN_MODE_EUI64:
3150                 /* addrconf_add_linklocal also adds a prefix_route and we
3151                  * only need to care about prefix routes if ipv6_generate_eui64
3152                  * couldn't generate one.
3153                  */
3154                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3155                         addrconf_add_linklocal(idev, &addr, 0);
3156                 else if (prefix_route)
3157                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3158                 break;
3159         case IN6_ADDR_GEN_MODE_NONE:
3160         default:
3161                 /* will not add any link local address */
3162                 break;
3163         }
3164 }
3165
3166 static void addrconf_dev_config(struct net_device *dev)
3167 {
3168         struct inet6_dev *idev;
3169
3170         ASSERT_RTNL();
3171
3172         if ((dev->type != ARPHRD_ETHER) &&
3173             (dev->type != ARPHRD_FDDI) &&
3174             (dev->type != ARPHRD_ARCNET) &&
3175             (dev->type != ARPHRD_INFINIBAND) &&
3176             (dev->type != ARPHRD_IEEE1394) &&
3177             (dev->type != ARPHRD_TUNNEL6) &&
3178             (dev->type != ARPHRD_6LOWPAN) &&
3179             (dev->type != ARPHRD_NONE)) {
3180                 /* Alas, we support only Ethernet autoconfiguration. */
3181                 return;
3182         }
3183
3184         idev = addrconf_add_dev(dev);
3185         if (IS_ERR(idev))
3186                 return;
3187
3188         /* this device type has no EUI support */
3189         if (dev->type == ARPHRD_NONE &&
3190             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3191                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3192
3193         addrconf_addr_gen(idev, false);
3194 }
3195
3196 #if IS_ENABLED(CONFIG_IPV6_SIT)
3197 static void addrconf_sit_config(struct net_device *dev)
3198 {
3199         struct inet6_dev *idev;
3200
3201         ASSERT_RTNL();
3202
3203         /*
3204          * Configure the tunnel with one of our IPv4
3205          * addresses... we should configure all of
3206          * our v4 addrs in the tunnel
3207          */
3208
3209         idev = ipv6_find_idev(dev);
3210         if (!idev) {
3211                 pr_debug("%s: add_dev failed\n", __func__);
3212                 return;
3213         }
3214
3215         if (dev->priv_flags & IFF_ISATAP) {
3216                 addrconf_addr_gen(idev, false);
3217                 return;
3218         }
3219
3220         sit_add_v4_addrs(idev);
3221
3222         if (dev->flags&IFF_POINTOPOINT)
3223                 addrconf_add_mroute(dev);
3224 }
3225 #endif
3226
3227 #if IS_ENABLED(CONFIG_NET_IPGRE)
3228 static void addrconf_gre_config(struct net_device *dev)
3229 {
3230         struct inet6_dev *idev;
3231
3232         ASSERT_RTNL();
3233
3234         idev = ipv6_find_idev(dev);
3235         if (!idev) {
3236                 pr_debug("%s: add_dev failed\n", __func__);
3237                 return;
3238         }
3239
3240         addrconf_addr_gen(idev, true);
3241         if (dev->flags & IFF_POINTOPOINT)
3242                 addrconf_add_mroute(dev);
3243 }
3244 #endif
3245
3246 static int fixup_permanent_addr(struct inet6_dev *idev,
3247                                 struct inet6_ifaddr *ifp)
3248 {
3249         if (!ifp->rt) {
3250                 struct rt6_info *rt;
3251
3252                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3253                 if (unlikely(IS_ERR(rt)))
3254                         return PTR_ERR(rt);
3255
3256                 ifp->rt = rt;
3257         }
3258
3259         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3260                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3261                                       idev->dev, 0, 0);
3262         }
3263
3264         addrconf_dad_start(ifp);
3265
3266         return 0;
3267 }
3268
3269 static void addrconf_permanent_addr(struct net_device *dev)
3270 {
3271         struct inet6_ifaddr *ifp, *tmp;
3272         struct inet6_dev *idev;
3273
3274         idev = __in6_dev_get(dev);
3275         if (!idev)
3276                 return;
3277
3278         write_lock_bh(&idev->lock);
3279
3280         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3281                 if ((ifp->flags & IFA_F_PERMANENT) &&
3282                     fixup_permanent_addr(idev, ifp) < 0) {
3283                         write_unlock_bh(&idev->lock);
3284                         ipv6_del_addr(ifp);
3285                         write_lock_bh(&idev->lock);
3286
3287                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3288                                              idev->dev->name, &ifp->addr);
3289                 }
3290         }
3291
3292         write_unlock_bh(&idev->lock);
3293 }
3294
3295 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3296                            void *ptr)
3297 {
3298         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3299         struct netdev_notifier_changeupper_info *info;
3300         struct inet6_dev *idev = __in6_dev_get(dev);
3301         int run_pending = 0;
3302         int err;
3303
3304         switch (event) {
3305         case NETDEV_REGISTER:
3306                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3307                         idev = ipv6_add_dev(dev);
3308                         if (IS_ERR(idev))
3309                                 return notifier_from_errno(PTR_ERR(idev));
3310                 }
3311                 break;
3312
3313         case NETDEV_CHANGEMTU:
3314                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3315                 if (dev->mtu < IPV6_MIN_MTU) {
3316                         addrconf_ifdown(dev, 1);
3317                         break;
3318                 }
3319
3320                 if (idev) {
3321                         rt6_mtu_change(dev, dev->mtu);
3322                         idev->cnf.mtu6 = dev->mtu;
3323                         break;
3324                 }
3325
3326                 /* allocate new idev */
3327                 idev = ipv6_add_dev(dev);
3328                 if (IS_ERR(idev))
3329                         break;
3330
3331                 /* device is still not ready */
3332                 if (!(idev->if_flags & IF_READY))
3333                         break;
3334
3335                 run_pending = 1;
3336
3337                 /* fall through */
3338
3339         case NETDEV_UP:
3340         case NETDEV_CHANGE:
3341                 if (dev->flags & IFF_SLAVE)
3342                         break;
3343
3344                 if (idev && idev->cnf.disable_ipv6)
3345                         break;
3346
3347                 if (event == NETDEV_UP) {
3348                         /* restore routes for permanent addresses */
3349                         addrconf_permanent_addr(dev);
3350
3351                         if (!addrconf_qdisc_ok(dev)) {
3352                                 /* device is not ready yet. */
3353                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3354                                         dev->name);
3355                                 break;
3356                         }
3357
3358                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3359                                 idev = ipv6_add_dev(dev);
3360
3361                         if (!IS_ERR_OR_NULL(idev)) {
3362                                 idev->if_flags |= IF_READY;
3363                                 run_pending = 1;
3364                         }
3365                 } else if (event == NETDEV_CHANGE) {
3366                         if (!addrconf_qdisc_ok(dev)) {
3367                                 /* device is still not ready. */
3368                                 break;
3369                         }
3370
3371                         if (idev) {
3372                                 if (idev->if_flags & IF_READY)
3373                                         /* device is already configured. */
3374                                         break;
3375                                 idev->if_flags |= IF_READY;
3376                         }
3377
3378                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3379                                 dev->name);
3380
3381                         run_pending = 1;
3382                 }
3383
3384                 switch (dev->type) {
3385 #if IS_ENABLED(CONFIG_IPV6_SIT)
3386                 case ARPHRD_SIT:
3387                         addrconf_sit_config(dev);
3388                         break;
3389 #endif
3390 #if IS_ENABLED(CONFIG_NET_IPGRE)
3391                 case ARPHRD_IPGRE:
3392                         addrconf_gre_config(dev);
3393                         break;
3394 #endif
3395                 case ARPHRD_LOOPBACK:
3396                         init_loopback(dev);
3397                         break;
3398
3399                 default:
3400                         addrconf_dev_config(dev);
3401                         break;
3402                 }
3403
3404                 if (!IS_ERR_OR_NULL(idev)) {
3405                         if (run_pending)
3406                                 addrconf_dad_run(idev);
3407
3408                         /*
3409                          * If the MTU changed during the interface down,
3410                          * when the interface up, the changed MTU must be
3411                          * reflected in the idev as well as routers.
3412                          */
3413                         if (idev->cnf.mtu6 != dev->mtu &&
3414                             dev->mtu >= IPV6_MIN_MTU) {
3415                                 rt6_mtu_change(dev, dev->mtu);
3416                                 idev->cnf.mtu6 = dev->mtu;
3417                         }
3418                         idev->tstamp = jiffies;
3419                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3420
3421                         /*
3422                          * If the changed mtu during down is lower than
3423                          * IPV6_MIN_MTU stop IPv6 on this interface.
3424                          */
3425                         if (dev->mtu < IPV6_MIN_MTU)
3426                                 addrconf_ifdown(dev, 1);
3427                 }
3428                 break;
3429
3430         case NETDEV_DOWN:
3431         case NETDEV_UNREGISTER:
3432                 /*
3433                  *      Remove all addresses from this interface.
3434                  */
3435                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3436                 break;
3437
3438         case NETDEV_CHANGENAME:
3439                 if (idev) {
3440                         snmp6_unregister_dev(idev);
3441                         addrconf_sysctl_unregister(idev);
3442                         err = addrconf_sysctl_register(idev);
3443                         if (err)
3444                                 return notifier_from_errno(err);
3445                         err = snmp6_register_dev(idev);
3446                         if (err) {
3447                                 addrconf_sysctl_unregister(idev);
3448                                 return notifier_from_errno(err);
3449                         }
3450                 }
3451                 break;
3452
3453         case NETDEV_PRE_TYPE_CHANGE:
3454         case NETDEV_POST_TYPE_CHANGE:
3455                 if (idev)
3456                         addrconf_type_change(dev, event);
3457                 break;
3458
3459         case NETDEV_CHANGEUPPER:
3460                 info = ptr;
3461
3462                 /* flush all routes if dev is linked to or unlinked from
3463                  * an L3 master device (e.g., VRF)
3464                  */
3465                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3466                         addrconf_ifdown(dev, 0);
3467         }
3468
3469         return NOTIFY_OK;
3470 }
3471
3472 /*
3473  *      addrconf module should be notified of a device going up
3474  */
3475 static struct notifier_block ipv6_dev_notf = {
3476         .notifier_call = addrconf_notify,
3477 };
3478
3479 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3480 {
3481         struct inet6_dev *idev;
3482         ASSERT_RTNL();
3483
3484         idev = __in6_dev_get(dev);
3485
3486         if (event == NETDEV_POST_TYPE_CHANGE)
3487                 ipv6_mc_remap(idev);
3488         else if (event == NETDEV_PRE_TYPE_CHANGE)
3489                 ipv6_mc_unmap(idev);
3490 }
3491
3492 static bool addr_is_local(const struct in6_addr *addr)
3493 {
3494         return ipv6_addr_type(addr) &
3495                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3496 }
3497
3498 static int addrconf_ifdown(struct net_device *dev, int how)
3499 {
3500         struct net *net = dev_net(dev);
3501         struct inet6_dev *idev;
3502         struct inet6_ifaddr *ifa, *tmp;
3503         struct list_head del_list;
3504         int _keep_addr;
3505         bool keep_addr;
3506         int state, i;
3507
3508         ASSERT_RTNL();
3509
3510         rt6_ifdown(net, dev);
3511         neigh_ifdown(&nd_tbl, dev);
3512
3513         idev = __in6_dev_get(dev);
3514         if (!idev)
3515                 return -ENODEV;
3516
3517         /*
3518          * Step 1: remove reference to ipv6 device from parent device.
3519          *         Do not dev_put!
3520          */
3521         if (how) {
3522                 idev->dead = 1;
3523
3524                 /* protected by rtnl_lock */
3525                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3526
3527                 /* Step 1.5: remove snmp6 entry */
3528                 snmp6_unregister_dev(idev);
3529
3530         }
3531
3532         /* aggregate the system setting and interface setting */
3533         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3534         if (!_keep_addr)
3535                 _keep_addr = idev->cnf.keep_addr_on_down;
3536
3537         /* combine the user config with event to determine if permanent
3538          * addresses are to be removed from address hash table
3539          */
3540         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3541
3542         /* Step 2: clear hash table */
3543         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3544                 struct hlist_head *h = &inet6_addr_lst[i];
3545
3546                 spin_lock_bh(&addrconf_hash_lock);
3547 restart:
3548                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3549                         if (ifa->idev == idev) {
3550                                 addrconf_del_dad_work(ifa);
3551                                 /* combined flag + permanent flag decide if
3552                                  * address is retained on a down event
3553                                  */
3554                                 if (!keep_addr ||
3555                                     !(ifa->flags & IFA_F_PERMANENT) ||
3556                                     addr_is_local(&ifa->addr)) {
3557                                         hlist_del_init_rcu(&ifa->addr_lst);
3558                                         goto restart;
3559                                 }
3560                         }
3561                 }
3562                 spin_unlock_bh(&addrconf_hash_lock);
3563         }
3564
3565         write_lock_bh(&idev->lock);
3566
3567         addrconf_del_rs_timer(idev);
3568
3569         /* Step 2: clear flags for stateless addrconf */
3570         if (!how)
3571                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3572
3573         if (how && del_timer(&idev->regen_timer))
3574                 in6_dev_put(idev);
3575
3576         /* Step 3: clear tempaddr list */
3577         while (!list_empty(&idev->tempaddr_list)) {
3578                 ifa = list_first_entry(&idev->tempaddr_list,
3579                                        struct inet6_ifaddr, tmp_list);
3580                 list_del(&ifa->tmp_list);
3581                 write_unlock_bh(&idev->lock);
3582                 spin_lock_bh(&ifa->lock);
3583
3584                 if (ifa->ifpub) {
3585                         in6_ifa_put(ifa->ifpub);
3586                         ifa->ifpub = NULL;
3587                 }
3588                 spin_unlock_bh(&ifa->lock);
3589                 in6_ifa_put(ifa);
3590                 write_lock_bh(&idev->lock);
3591         }
3592
3593         /* re-combine the user config with event to determine if permanent
3594          * addresses are to be removed from the interface list
3595          */
3596         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3597
3598         INIT_LIST_HEAD(&del_list);
3599         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3600                 struct rt6_info *rt = NULL;
3601
3602                 addrconf_del_dad_work(ifa);
3603
3604                 write_unlock_bh(&idev->lock);
3605                 spin_lock_bh(&ifa->lock);
3606
3607                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3608                     !addr_is_local(&ifa->addr)) {
3609                         /* set state to skip the notifier below */
3610                         state = INET6_IFADDR_STATE_DEAD;
3611                         ifa->state = 0;
3612                         if (!(ifa->flags & IFA_F_NODAD))
3613                                 ifa->flags |= IFA_F_TENTATIVE;
3614
3615                         rt = ifa->rt;
3616                         ifa->rt = NULL;
3617                 } else {
3618                         state = ifa->state;
3619                         ifa->state = INET6_IFADDR_STATE_DEAD;
3620
3621                         list_move(&ifa->if_list, &del_list);
3622                 }
3623
3624                 spin_unlock_bh(&ifa->lock);
3625
3626                 if (rt)
3627                         ip6_del_rt(rt);
3628
3629                 if (state != INET6_IFADDR_STATE_DEAD) {
3630                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3631                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3632                 } else {
3633                         if (idev->cnf.forwarding)
3634                                 addrconf_leave_anycast(ifa);
3635                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3636                 }
3637
3638                 write_lock_bh(&idev->lock);
3639         }
3640
3641         write_unlock_bh(&idev->lock);
3642
3643         /* now clean up addresses to be removed */
3644         while (!list_empty(&del_list)) {
3645                 ifa = list_first_entry(&del_list,
3646                                        struct inet6_ifaddr, if_list);
3647                 list_del(&ifa->if_list);
3648
3649                 in6_ifa_put(ifa);
3650         }
3651
3652         /* Step 5: Discard anycast and multicast list */
3653         if (how) {
3654                 ipv6_ac_destroy_dev(idev);
3655                 ipv6_mc_destroy_dev(idev);
3656         } else {
3657                 ipv6_mc_down(idev);
3658         }
3659
3660         idev->tstamp = jiffies;
3661
3662         /* Last: Shot the device (if unregistered) */
3663         if (how) {
3664                 addrconf_sysctl_unregister(idev);
3665                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3666                 neigh_ifdown(&nd_tbl, dev);
3667                 in6_dev_put(idev);
3668         }
3669         return 0;
3670 }
3671
3672 static void addrconf_rs_timer(unsigned long data)
3673 {
3674         struct inet6_dev *idev = (struct inet6_dev *)data;
3675         struct net_device *dev = idev->dev;
3676         struct in6_addr lladdr;
3677
3678         write_lock(&idev->lock);
3679         if (idev->dead || !(idev->if_flags & IF_READY))
3680                 goto out;
3681
3682         if (!ipv6_accept_ra(idev))
3683                 goto out;
3684
3685         /* Announcement received after solicitation was sent */
3686         if (idev->if_flags & IF_RA_RCVD)
3687                 goto out;
3688
3689         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3690                 write_unlock(&idev->lock);
3691                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3692                         ndisc_send_rs(dev, &lladdr,
3693                                       &in6addr_linklocal_allrouters);
3694                 else
3695                         goto put;
3696
3697                 write_lock(&idev->lock);
3698                 /* The wait after the last probe can be shorter */
3699                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3700                                              idev->cnf.rtr_solicits) ?
3701                                       idev->cnf.rtr_solicit_delay :
3702                                       idev->cnf.rtr_solicit_interval);
3703         } else {
3704                 /*
3705                  * Note: we do not support deprecated "all on-link"
3706                  * assumption any longer.
3707                  */
3708                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3709         }
3710
3711 out:
3712         write_unlock(&idev->lock);
3713 put:
3714         in6_dev_put(idev);
3715 }
3716
3717 /*
3718  *      Duplicate Address Detection
3719  */
3720 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3721 {
3722         unsigned long rand_num;
3723         struct inet6_dev *idev = ifp->idev;
3724
3725         if (ifp->flags & IFA_F_OPTIMISTIC)
3726                 rand_num = 0;
3727         else
3728                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3729
3730         ifp->dad_probes = idev->cnf.dad_transmits;
3731         addrconf_mod_dad_work(ifp, rand_num);
3732 }
3733
3734 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3735 {
3736         struct inet6_dev *idev = ifp->idev;
3737         struct net_device *dev = idev->dev;
3738         bool notify = false;
3739
3740         addrconf_join_solict(dev, &ifp->addr);
3741
3742         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3743
3744         read_lock_bh(&idev->lock);
3745         spin_lock(&ifp->lock);
3746         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3747                 goto out;
3748
3749         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3750             idev->cnf.accept_dad < 1 ||
3751             !(ifp->flags&IFA_F_TENTATIVE) ||
3752             ifp->flags & IFA_F_NODAD) {
3753                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3754                 spin_unlock(&ifp->lock);
3755                 read_unlock_bh(&idev->lock);
3756
3757                 addrconf_dad_completed(ifp);
3758                 return;
3759         }
3760
3761         if (!(idev->if_flags & IF_READY)) {
3762                 spin_unlock(&ifp->lock);
3763                 read_unlock_bh(&idev->lock);
3764                 /*
3765                  * If the device is not ready:
3766                  * - keep it tentative if it is a permanent address.
3767                  * - otherwise, kill it.
3768                  */
3769                 in6_ifa_hold(ifp);
3770                 addrconf_dad_stop(ifp, 0);
3771                 return;
3772         }
3773
3774         /*
3775          * Optimistic nodes can start receiving
3776          * Frames right away
3777          */
3778         if (ifp->flags & IFA_F_OPTIMISTIC) {
3779                 ip6_ins_rt(ifp->rt);
3780                 if (ipv6_use_optimistic_addr(idev)) {
3781                         /* Because optimistic nodes can use this address,
3782                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3783                          */
3784                         notify = true;
3785                 }
3786         }
3787
3788         addrconf_dad_kick(ifp);
3789 out:
3790         spin_unlock(&ifp->lock);
3791         read_unlock_bh(&idev->lock);
3792         if (notify)
3793                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3794 }
3795
3796 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3797 {
3798         bool begin_dad = false;
3799
3800         spin_lock_bh(&ifp->lock);
3801         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3802                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3803                 begin_dad = true;
3804         }
3805         spin_unlock_bh(&ifp->lock);
3806
3807         if (begin_dad)
3808                 addrconf_mod_dad_work(ifp, 0);
3809 }
3810
3811 static void addrconf_dad_work(struct work_struct *w)
3812 {
3813         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3814                                                 struct inet6_ifaddr,
3815                                                 dad_work);
3816         struct inet6_dev *idev = ifp->idev;
3817         struct in6_addr mcaddr;
3818         bool disable_ipv6 = false;
3819
3820         enum {
3821                 DAD_PROCESS,
3822                 DAD_BEGIN,
3823                 DAD_ABORT,
3824         } action = DAD_PROCESS;
3825
3826         rtnl_lock();
3827
3828         spin_lock_bh(&ifp->lock);
3829         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3830                 action = DAD_BEGIN;
3831                 ifp->state = INET6_IFADDR_STATE_DAD;
3832         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3833                 action = DAD_ABORT;
3834                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3835
3836                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3837                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3838                         struct in6_addr addr;
3839
3840                         addr.s6_addr32[0] = htonl(0xfe800000);
3841                         addr.s6_addr32[1] = 0;
3842
3843                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3844                             ipv6_addr_equal(&ifp->addr, &addr)) {
3845                                 /* DAD failed for link-local based on MAC */
3846                                 idev->cnf.disable_ipv6 = 1;
3847
3848                                 pr_info("%s: IPv6 being disabled!\n",
3849                                         ifp->idev->dev->name);
3850                                 disable_ipv6 = true;
3851                         }
3852                 }
3853         }
3854         spin_unlock_bh(&ifp->lock);
3855
3856         if (action == DAD_BEGIN) {
3857                 addrconf_dad_begin(ifp);
3858                 goto out;
3859         } else if (action == DAD_ABORT) {
3860                 addrconf_dad_stop(ifp, 1);
3861                 if (disable_ipv6)
3862                         addrconf_ifdown(idev->dev, 0);
3863                 goto out;
3864         }
3865
3866         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3867                 goto out;
3868
3869         write_lock_bh(&idev->lock);
3870         if (idev->dead || !(idev->if_flags & IF_READY)) {
3871                 write_unlock_bh(&idev->lock);
3872                 goto out;
3873         }
3874
3875         spin_lock(&ifp->lock);
3876         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3877                 spin_unlock(&ifp->lock);
3878                 write_unlock_bh(&idev->lock);
3879                 goto out;
3880         }
3881
3882         if (ifp->dad_probes == 0) {
3883                 /*
3884                  * DAD was successful
3885                  */
3886
3887                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3888                 spin_unlock(&ifp->lock);
3889                 write_unlock_bh(&idev->lock);
3890
3891                 addrconf_dad_completed(ifp);
3892
3893                 goto out;
3894         }
3895
3896         ifp->dad_probes--;
3897         addrconf_mod_dad_work(ifp,
3898                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3899         spin_unlock(&ifp->lock);
3900         write_unlock_bh(&idev->lock);
3901
3902         /* send a neighbour solicitation for our addr */
3903         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3904         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3905 out:
3906         in6_ifa_put(ifp);
3907         rtnl_unlock();
3908 }
3909
3910 /* ifp->idev must be at least read locked */
3911 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3912 {
3913         struct inet6_ifaddr *ifpiter;
3914         struct inet6_dev *idev = ifp->idev;
3915
3916         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3917                 if (ifpiter->scope > IFA_LINK)
3918                         break;
3919                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3920                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3921                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3922                     IFA_F_PERMANENT)
3923                         return false;
3924         }
3925         return true;
3926 }
3927
3928 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3929 {
3930         struct net_device *dev = ifp->idev->dev;
3931         struct in6_addr lladdr;
3932         bool send_rs, send_mld;
3933
3934         addrconf_del_dad_work(ifp);
3935
3936         /*
3937          *      Configure the address for reception. Now it is valid.
3938          */
3939
3940         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3941
3942         /* If added prefix is link local and we are prepared to process
3943            router advertisements, start sending router solicitations.
3944          */
3945
3946         read_lock_bh(&ifp->idev->lock);
3947         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3948         send_rs = send_mld &&
3949                   ipv6_accept_ra(ifp->idev) &&
3950                   ifp->idev->cnf.rtr_solicits > 0 &&
3951                   (dev->flags&IFF_LOOPBACK) == 0;
3952         read_unlock_bh(&ifp->idev->lock);
3953
3954         /* While dad is in progress mld report's source address is in6_addrany.
3955          * Resend with proper ll now.
3956          */
3957         if (send_mld)
3958                 ipv6_mc_dad_complete(ifp->idev);
3959
3960         if (send_rs) {
3961                 /*
3962                  *      If a host as already performed a random delay
3963                  *      [...] as part of DAD [...] there is no need
3964                  *      to delay again before sending the first RS
3965                  */
3966                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3967                         return;
3968                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3969
3970                 write_lock_bh(&ifp->idev->lock);
3971                 spin_lock(&ifp->lock);
3972                 ifp->idev->rs_probes = 1;
3973                 ifp->idev->if_flags |= IF_RS_SENT;
3974                 addrconf_mod_rs_timer(ifp->idev,
3975                                       ifp->idev->cnf.rtr_solicit_interval);
3976                 spin_unlock(&ifp->lock);
3977                 write_unlock_bh(&ifp->idev->lock);
3978         }
3979 }
3980
3981 static void addrconf_dad_run(struct inet6_dev *idev)
3982 {
3983         struct inet6_ifaddr *ifp;
3984
3985         read_lock_bh(&idev->lock);
3986         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3987                 spin_lock(&ifp->lock);
3988                 if (ifp->flags & IFA_F_TENTATIVE &&
3989                     ifp->state == INET6_IFADDR_STATE_DAD)
3990                         addrconf_dad_kick(ifp);
3991                 spin_unlock(&ifp->lock);
3992         }
3993         read_unlock_bh(&idev->lock);
3994 }
3995
3996 #ifdef CONFIG_PROC_FS
3997 struct if6_iter_state {
3998         struct seq_net_private p;
3999         int bucket;
4000         int offset;
4001 };
4002
4003 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4004 {
4005         struct inet6_ifaddr *ifa = NULL;
4006         struct if6_iter_state *state = seq->private;
4007         struct net *net = seq_file_net(seq);
4008         int p = 0;
4009
4010         /* initial bucket if pos is 0 */
4011         if (pos == 0) {
4012                 state->bucket = 0;
4013                 state->offset = 0;
4014         }
4015
4016         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4017                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4018                                          addr_lst) {
4019                         if (!net_eq(dev_net(ifa->idev->dev), net))
4020                                 continue;
4021                         /* sync with offset */
4022                         if (p < state->offset) {
4023                                 p++;
4024                                 continue;
4025                         }
4026                         state->offset++;
4027                         return ifa;
4028                 }
4029
4030                 /* prepare for next bucket */
4031                 state->offset = 0;
4032                 p = 0;
4033         }
4034         return NULL;
4035 }
4036
4037 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4038                                          struct inet6_ifaddr *ifa)
4039 {
4040         struct if6_iter_state *state = seq->private;
4041         struct net *net = seq_file_net(seq);
4042
4043         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4044                 if (!net_eq(dev_net(ifa->idev->dev), net))
4045                         continue;
4046                 state->offset++;
4047                 return ifa;
4048         }
4049
4050         while (++state->bucket < IN6_ADDR_HSIZE) {
4051                 state->offset = 0;
4052                 hlist_for_each_entry_rcu_bh(ifa,
4053                                      &inet6_addr_lst[state->bucket], addr_lst) {
4054                         if (!net_eq(dev_net(ifa->idev->dev), net))
4055                                 continue;
4056                         state->offset++;
4057                         return ifa;
4058                 }
4059         }
4060
4061         return NULL;
4062 }
4063
4064 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4065         __acquires(rcu_bh)
4066 {
4067         rcu_read_lock_bh();
4068         return if6_get_first(seq, *pos);
4069 }
4070
4071 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4072 {
4073         struct inet6_ifaddr *ifa;
4074
4075         ifa = if6_get_next(seq, v);
4076         ++*pos;
4077         return ifa;
4078 }
4079
4080 static void if6_seq_stop(struct seq_file *seq, void *v)
4081         __releases(rcu_bh)
4082 {
4083         rcu_read_unlock_bh();
4084 }
4085
4086 static int if6_seq_show(struct seq_file *seq, void *v)
4087 {
4088         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4089         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4090                    &ifp->addr,
4091                    ifp->idev->dev->ifindex,
4092                    ifp->prefix_len,
4093                    ifp->scope,
4094                    (u8) ifp->flags,
4095                    ifp->idev->dev->name);
4096         return 0;
4097 }
4098
4099 static const struct seq_operations if6_seq_ops = {
4100         .start  = if6_seq_start,
4101         .next   = if6_seq_next,
4102         .show   = if6_seq_show,
4103         .stop   = if6_seq_stop,
4104 };
4105
4106 static int if6_seq_open(struct inode *inode, struct file *file)
4107 {
4108         return seq_open_net(inode, file, &if6_seq_ops,
4109                             sizeof(struct if6_iter_state));
4110 }
4111
4112 static const struct file_operations if6_fops = {
4113         .owner          = THIS_MODULE,
4114         .open           = if6_seq_open,
4115         .read           = seq_read,
4116         .llseek         = seq_lseek,
4117         .release        = seq_release_net,
4118 };
4119
4120 static int __net_init if6_proc_net_init(struct net *net)
4121 {
4122         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4123                 return -ENOMEM;
4124         return 0;
4125 }
4126
4127 static void __net_exit if6_proc_net_exit(struct net *net)
4128 {
4129         remove_proc_entry("if_inet6", net->proc_net);
4130 }
4131
4132 static struct pernet_operations if6_proc_net_ops = {
4133         .init = if6_proc_net_init,
4134         .exit = if6_proc_net_exit,
4135 };
4136
4137 int __init if6_proc_init(void)
4138 {
4139         return register_pernet_subsys(&if6_proc_net_ops);
4140 }
4141
4142 void if6_proc_exit(void)
4143 {
4144         unregister_pernet_subsys(&if6_proc_net_ops);
4145 }
4146 #endif  /* CONFIG_PROC_FS */
4147
4148 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4149 /* Check if address is a home address configured on any interface. */
4150 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4151 {
4152         int ret = 0;
4153         struct inet6_ifaddr *ifp = NULL;
4154         unsigned int hash = inet6_addr_hash(addr);
4155
4156         rcu_read_lock_bh();
4157         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4158                 if (!net_eq(dev_net(ifp->idev->dev), net))
4159                         continue;
4160                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4161                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4162                         ret = 1;
4163                         break;
4164                 }
4165         }
4166         rcu_read_unlock_bh();
4167         return ret;
4168 }
4169 #endif
4170
4171 /*
4172  *      Periodic address status verification
4173  */
4174
4175 static void addrconf_verify_rtnl(void)
4176 {
4177         unsigned long now, next, next_sec, next_sched;
4178         struct inet6_ifaddr *ifp;
4179         int i;
4180
4181         ASSERT_RTNL();
4182
4183         rcu_read_lock_bh();
4184         now = jiffies;
4185         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4186
4187         cancel_delayed_work(&addr_chk_work);
4188
4189         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4190 restart:
4191                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4192                         unsigned long age;
4193
4194                         /* When setting preferred_lft to a value not zero or
4195                          * infinity, while valid_lft is infinity
4196                          * IFA_F_PERMANENT has a non-infinity life time.
4197                          */
4198                         if ((ifp->flags & IFA_F_PERMANENT) &&
4199                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4200                                 continue;
4201
4202                         spin_lock(&ifp->lock);
4203                         /* We try to batch several events at once. */
4204                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4205
4206                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4207                             age >= ifp->valid_lft) {
4208                                 spin_unlock(&ifp->lock);
4209                                 in6_ifa_hold(ifp);
4210                                 ipv6_del_addr(ifp);
4211                                 goto restart;
4212                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4213                                 spin_unlock(&ifp->lock);
4214                                 continue;
4215                         } else if (age >= ifp->prefered_lft) {
4216                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4217                                 int deprecate = 0;
4218
4219                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4220                                         deprecate = 1;
4221                                         ifp->flags |= IFA_F_DEPRECATED;
4222                                 }
4223
4224                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4225                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4226                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4227
4228                                 spin_unlock(&ifp->lock);
4229
4230                                 if (deprecate) {
4231                                         in6_ifa_hold(ifp);
4232
4233                                         ipv6_ifa_notify(0, ifp);
4234                                         in6_ifa_put(ifp);
4235                                         goto restart;
4236                                 }
4237                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4238                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4239                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4240                                         ifp->idev->cnf.dad_transmits *
4241                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4242
4243                                 if (age >= ifp->prefered_lft - regen_advance) {
4244                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4245                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4246                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4247                                         if (!ifp->regen_count && ifpub) {
4248                                                 ifp->regen_count++;
4249                                                 in6_ifa_hold(ifp);
4250                                                 in6_ifa_hold(ifpub);
4251                                                 spin_unlock(&ifp->lock);
4252
4253                                                 spin_lock(&ifpub->lock);
4254                                                 ifpub->regen_count = 0;
4255                                                 spin_unlock(&ifpub->lock);
4256                                                 ipv6_create_tempaddr(ifpub, ifp);
4257                                                 in6_ifa_put(ifpub);
4258                                                 in6_ifa_put(ifp);
4259                                                 goto restart;
4260                                         }
4261                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4262                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4263                                 spin_unlock(&ifp->lock);
4264                         } else {
4265                                 /* ifp->prefered_lft <= ifp->valid_lft */
4266                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4267                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4268                                 spin_unlock(&ifp->lock);
4269                         }
4270                 }
4271         }
4272
4273         next_sec = round_jiffies_up(next);
4274         next_sched = next;
4275
4276         /* If rounded timeout is accurate enough, accept it. */
4277         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4278                 next_sched = next_sec;
4279
4280         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4281         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4282                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4283
4284         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4285               now, next, next_sec, next_sched);
4286         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4287         rcu_read_unlock_bh();
4288 }
4289
4290 static void addrconf_verify_work(struct work_struct *w)
4291 {
4292         rtnl_lock();
4293         addrconf_verify_rtnl();
4294         rtnl_unlock();
4295 }
4296
4297 static void addrconf_verify(void)
4298 {
4299         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4300 }
4301
4302 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4303                                      struct in6_addr **peer_pfx)
4304 {
4305         struct in6_addr *pfx = NULL;
4306
4307         *peer_pfx = NULL;
4308
4309         if (addr)
4310                 pfx = nla_data(addr);
4311
4312         if (local) {
4313                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4314                         *peer_pfx = pfx;
4315                 pfx = nla_data(local);
4316         }
4317
4318         return pfx;
4319 }
4320
4321 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4322         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4323         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4324         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4325         [IFA_FLAGS]             = { .len = sizeof(u32) },
4326 };
4327
4328 static int
4329 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4330 {
4331         struct net *net = sock_net(skb->sk);
4332         struct ifaddrmsg *ifm;
4333         struct nlattr *tb[IFA_MAX+1];
4334         struct in6_addr *pfx, *peer_pfx;
4335         u32 ifa_flags;
4336         int err;
4337
4338         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4339         if (err < 0)
4340                 return err;
4341
4342         ifm = nlmsg_data(nlh);
4343         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4344         if (!pfx)
4345                 return -EINVAL;
4346
4347         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4348
4349         /* We ignore other flags so far. */
4350         ifa_flags &= IFA_F_MANAGETEMPADDR;
4351
4352         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4353                               ifm->ifa_prefixlen);
4354 }
4355
4356 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4357                              u32 prefered_lft, u32 valid_lft)
4358 {
4359         u32 flags;
4360         clock_t expires;
4361         unsigned long timeout;
4362         bool was_managetempaddr;
4363         bool had_prefixroute;
4364
4365         ASSERT_RTNL();
4366
4367         if (!valid_lft || (prefered_lft > valid_lft))
4368                 return -EINVAL;
4369
4370         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4371             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4372                 return -EINVAL;
4373
4374         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4375         if (addrconf_finite_timeout(timeout)) {
4376                 expires = jiffies_to_clock_t(timeout * HZ);
4377                 valid_lft = timeout;
4378                 flags = RTF_EXPIRES;
4379         } else {
4380                 expires = 0;
4381                 flags = 0;
4382                 ifa_flags |= IFA_F_PERMANENT;
4383         }
4384
4385         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4386         if (addrconf_finite_timeout(timeout)) {
4387                 if (timeout == 0)
4388                         ifa_flags |= IFA_F_DEPRECATED;
4389                 prefered_lft = timeout;
4390         }
4391
4392         spin_lock_bh(&ifp->lock);
4393         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4394         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4395                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4396         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4397                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4398                         IFA_F_NOPREFIXROUTE);
4399         ifp->flags |= ifa_flags;
4400         ifp->tstamp = jiffies;
4401         ifp->valid_lft = valid_lft;
4402         ifp->prefered_lft = prefered_lft;
4403
4404         spin_unlock_bh(&ifp->lock);
4405         if (!(ifp->flags&IFA_F_TENTATIVE))
4406                 ipv6_ifa_notify(0, ifp);
4407
4408         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4409                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4410                                       expires, flags);
4411         } else if (had_prefixroute) {
4412                 enum cleanup_prefix_rt_t action;
4413                 unsigned long rt_expires;
4414
4415                 write_lock_bh(&ifp->idev->lock);
4416                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4417                 write_unlock_bh(&ifp->idev->lock);
4418
4419                 if (action != CLEANUP_PREFIX_RT_NOP) {
4420                         cleanup_prefix_route(ifp, rt_expires,
4421                                 action == CLEANUP_PREFIX_RT_DEL);
4422                 }
4423         }
4424
4425         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4426                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4427                         valid_lft = prefered_lft = 0;
4428                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4429                                  !was_managetempaddr, jiffies);
4430         }
4431
4432         addrconf_verify_rtnl();
4433
4434         return 0;
4435 }
4436
4437 static int
4438 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4439 {
4440         struct net *net = sock_net(skb->sk);
4441         struct ifaddrmsg *ifm;
4442         struct nlattr *tb[IFA_MAX+1];
4443         struct in6_addr *pfx, *peer_pfx;
4444         struct inet6_ifaddr *ifa;
4445         struct net_device *dev;
4446         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4447         u32 ifa_flags;
4448         int err;
4449
4450         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4451         if (err < 0)
4452                 return err;
4453
4454         ifm = nlmsg_data(nlh);
4455         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4456         if (!pfx)
4457                 return -EINVAL;
4458
4459         if (tb[IFA_CACHEINFO]) {
4460                 struct ifa_cacheinfo *ci;
4461
4462                 ci = nla_data(tb[IFA_CACHEINFO]);
4463                 valid_lft = ci->ifa_valid;
4464                 preferred_lft = ci->ifa_prefered;
4465         } else {
4466                 preferred_lft = INFINITY_LIFE_TIME;
4467                 valid_lft = INFINITY_LIFE_TIME;
4468         }
4469
4470         dev =  __dev_get_by_index(net, ifm->ifa_index);
4471         if (!dev)
4472                 return -ENODEV;
4473
4474         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4475
4476         /* We ignore other flags so far. */
4477         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4478                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4479
4480         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4481         if (!ifa) {
4482                 /*
4483                  * It would be best to check for !NLM_F_CREATE here but
4484                  * userspace already relies on not having to provide this.
4485                  */
4486                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4487                                       ifm->ifa_prefixlen, ifa_flags,
4488                                       preferred_lft, valid_lft);
4489         }
4490
4491         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4492             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4493                 err = -EEXIST;
4494         else
4495                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4496
4497         in6_ifa_put(ifa);
4498
4499         return err;
4500 }
4501
4502 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4503                           u8 scope, int ifindex)
4504 {
4505         struct ifaddrmsg *ifm;
4506
4507         ifm = nlmsg_data(nlh);
4508         ifm->ifa_family = AF_INET6;
4509         ifm->ifa_prefixlen = prefixlen;
4510         ifm->ifa_flags = flags;
4511         ifm->ifa_scope = scope;
4512         ifm->ifa_index = ifindex;
4513 }
4514
4515 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4516                          unsigned long tstamp, u32 preferred, u32 valid)
4517 {
4518         struct ifa_cacheinfo ci;
4519
4520         ci.cstamp = cstamp_delta(cstamp);
4521         ci.tstamp = cstamp_delta(tstamp);
4522         ci.ifa_prefered = preferred;
4523         ci.ifa_valid = valid;
4524
4525         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4526 }
4527
4528 static inline int rt_scope(int ifa_scope)
4529 {
4530         if (ifa_scope & IFA_HOST)
4531                 return RT_SCOPE_HOST;
4532         else if (ifa_scope & IFA_LINK)
4533                 return RT_SCOPE_LINK;
4534         else if (ifa_scope & IFA_SITE)
4535                 return RT_SCOPE_SITE;
4536         else
4537                 return RT_SCOPE_UNIVERSE;
4538 }
4539
4540 static inline int inet6_ifaddr_msgsize(void)
4541 {
4542         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4543                + nla_total_size(16) /* IFA_LOCAL */
4544                + nla_total_size(16) /* IFA_ADDRESS */
4545                + nla_total_size(sizeof(struct ifa_cacheinfo))
4546                + nla_total_size(4)  /* IFA_FLAGS */;
4547 }
4548
4549 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4550                              u32 portid, u32 seq, int event, unsigned int flags)
4551 {
4552         struct nlmsghdr  *nlh;
4553         u32 preferred, valid;
4554
4555         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4556         if (!nlh)
4557                 return -EMSGSIZE;
4558
4559         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4560                       ifa->idev->dev->ifindex);
4561
4562         if (!((ifa->flags&IFA_F_PERMANENT) &&
4563               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4564                 preferred = ifa->prefered_lft;
4565                 valid = ifa->valid_lft;
4566                 if (preferred != INFINITY_LIFE_TIME) {
4567                         long tval = (jiffies - ifa->tstamp)/HZ;
4568                         if (preferred > tval)
4569                                 preferred -= tval;
4570                         else
4571                                 preferred = 0;
4572                         if (valid != INFINITY_LIFE_TIME) {
4573                                 if (valid > tval)
4574                                         valid -= tval;
4575                                 else
4576                                         valid = 0;
4577                         }
4578                 }
4579         } else {
4580                 preferred = INFINITY_LIFE_TIME;
4581                 valid = INFINITY_LIFE_TIME;
4582         }
4583
4584         if (!ipv6_addr_any(&ifa->peer_addr)) {
4585                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4586                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4587                         goto error;
4588         } else
4589                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4590                         goto error;
4591
4592         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4593                 goto error;
4594
4595         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4596                 goto error;
4597
4598         nlmsg_end(skb, nlh);
4599         return 0;
4600
4601 error:
4602         nlmsg_cancel(skb, nlh);
4603         return -EMSGSIZE;
4604 }
4605
4606 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4607                                 u32 portid, u32 seq, int event, u16 flags)
4608 {
4609         struct nlmsghdr  *nlh;
4610         u8 scope = RT_SCOPE_UNIVERSE;
4611         int ifindex = ifmca->idev->dev->ifindex;
4612
4613         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4614                 scope = RT_SCOPE_SITE;
4615
4616         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4617         if (!nlh)
4618                 return -EMSGSIZE;
4619
4620         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4621         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4622             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4623                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4624                 nlmsg_cancel(skb, nlh);
4625                 return -EMSGSIZE;
4626         }
4627
4628         nlmsg_end(skb, nlh);
4629         return 0;
4630 }
4631
4632 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4633                                 u32 portid, u32 seq, int event, unsigned int flags)
4634 {
4635         struct nlmsghdr  *nlh;
4636         u8 scope = RT_SCOPE_UNIVERSE;
4637         int ifindex = ifaca->aca_idev->dev->ifindex;
4638
4639         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4640                 scope = RT_SCOPE_SITE;
4641
4642         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4643         if (!nlh)
4644                 return -EMSGSIZE;
4645
4646         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4647         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4648             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4649                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4650                 nlmsg_cancel(skb, nlh);
4651                 return -EMSGSIZE;
4652         }
4653
4654         nlmsg_end(skb, nlh);
4655         return 0;
4656 }
4657
4658 enum addr_type_t {
4659         UNICAST_ADDR,
4660         MULTICAST_ADDR,
4661         ANYCAST_ADDR,
4662 };
4663
4664 /* called with rcu_read_lock() */
4665 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4666                           struct netlink_callback *cb, enum addr_type_t type,
4667                           int s_ip_idx, int *p_ip_idx)
4668 {
4669         struct ifmcaddr6 *ifmca;
4670         struct ifacaddr6 *ifaca;
4671         int err = 1;
4672         int ip_idx = *p_ip_idx;
4673
4674         read_lock_bh(&idev->lock);
4675         switch (type) {
4676         case UNICAST_ADDR: {
4677                 struct inet6_ifaddr *ifa;
4678
4679                 /* unicast address incl. temp addr */
4680                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4681                         if (++ip_idx < s_ip_idx)
4682                                 continue;
4683                         err = inet6_fill_ifaddr(skb, ifa,
4684                                                 NETLINK_CB(cb->skb).portid,
4685                                                 cb->nlh->nlmsg_seq,
4686                                                 RTM_NEWADDR,
4687                                                 NLM_F_MULTI);
4688                         if (err < 0)
4689                                 break;
4690                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4691                 }
4692                 break;
4693         }
4694         case MULTICAST_ADDR:
4695                 /* multicast address */
4696                 for (ifmca = idev->mc_list; ifmca;
4697                      ifmca = ifmca->next, ip_idx++) {
4698                         if (ip_idx < s_ip_idx)
4699                                 continue;
4700                         err = inet6_fill_ifmcaddr(skb, ifmca,
4701                                                   NETLINK_CB(cb->skb).portid,
4702                                                   cb->nlh->nlmsg_seq,
4703                                                   RTM_GETMULTICAST,
4704                                                   NLM_F_MULTI);
4705                         if (err < 0)
4706                                 break;
4707                 }
4708                 break;
4709         case ANYCAST_ADDR:
4710                 /* anycast address */
4711                 for (ifaca = idev->ac_list; ifaca;
4712                      ifaca = ifaca->aca_next, ip_idx++) {
4713                         if (ip_idx < s_ip_idx)
4714                                 continue;
4715                         err = inet6_fill_ifacaddr(skb, ifaca,
4716                                                   NETLINK_CB(cb->skb).portid,
4717                                                   cb->nlh->nlmsg_seq,
4718                                                   RTM_GETANYCAST,
4719                                                   NLM_F_MULTI);
4720                         if (err < 0)
4721                                 break;
4722                 }
4723                 break;
4724         default:
4725                 break;
4726         }
4727         read_unlock_bh(&idev->lock);
4728         *p_ip_idx = ip_idx;
4729         return err;
4730 }
4731
4732 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4733                            enum addr_type_t type)
4734 {
4735         struct net *net = sock_net(skb->sk);
4736         int h, s_h;
4737         int idx, ip_idx;
4738         int s_idx, s_ip_idx;
4739         struct net_device *dev;
4740         struct inet6_dev *idev;
4741         struct hlist_head *head;
4742
4743         s_h = cb->args[0];
4744         s_idx = idx = cb->args[1];
4745         s_ip_idx = ip_idx = cb->args[2];
4746
4747         rcu_read_lock();
4748         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4749         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4750                 idx = 0;
4751                 head = &net->dev_index_head[h];
4752                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4753                         if (idx < s_idx)
4754                                 goto cont;
4755                         if (h > s_h || idx > s_idx)
4756                                 s_ip_idx = 0;
4757                         ip_idx = 0;
4758                         idev = __in6_dev_get(dev);
4759                         if (!idev)
4760                                 goto cont;
4761
4762                         if (in6_dump_addrs(idev, skb, cb, type,
4763                                            s_ip_idx, &ip_idx) < 0)
4764                                 goto done;
4765 cont:
4766                         idx++;
4767                 }
4768         }
4769 done:
4770         rcu_read_unlock();
4771         cb->args[0] = h;
4772         cb->args[1] = idx;
4773         cb->args[2] = ip_idx;
4774
4775         return skb->len;
4776 }
4777
4778 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4779 {
4780         enum addr_type_t type = UNICAST_ADDR;
4781
4782         return inet6_dump_addr(skb, cb, type);
4783 }
4784
4785 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4786 {
4787         enum addr_type_t type = MULTICAST_ADDR;
4788
4789         return inet6_dump_addr(skb, cb, type);
4790 }
4791
4792
4793 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4794 {
4795         enum addr_type_t type = ANYCAST_ADDR;
4796
4797         return inet6_dump_addr(skb, cb, type);
4798 }
4799
4800 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4801 {
4802         struct net *net = sock_net(in_skb->sk);
4803         struct ifaddrmsg *ifm;
4804         struct nlattr *tb[IFA_MAX+1];
4805         struct in6_addr *addr = NULL, *peer;
4806         struct net_device *dev = NULL;
4807         struct inet6_ifaddr *ifa;
4808         struct sk_buff *skb;
4809         int err;
4810
4811         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4812         if (err < 0)
4813                 goto errout;
4814
4815         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4816         if (!addr) {
4817                 err = -EINVAL;
4818                 goto errout;
4819         }
4820
4821         ifm = nlmsg_data(nlh);
4822         if (ifm->ifa_index)
4823                 dev = __dev_get_by_index(net, ifm->ifa_index);
4824
4825         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4826         if (!ifa) {
4827                 err = -EADDRNOTAVAIL;
4828                 goto errout;
4829         }
4830
4831         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4832         if (!skb) {
4833                 err = -ENOBUFS;
4834                 goto errout_ifa;
4835         }
4836
4837         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4838                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4839         if (err < 0) {
4840                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4841                 WARN_ON(err == -EMSGSIZE);
4842                 kfree_skb(skb);
4843                 goto errout_ifa;
4844         }
4845         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4846 errout_ifa:
4847         in6_ifa_put(ifa);
4848 errout:
4849         return err;
4850 }
4851
4852 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4853 {
4854         struct sk_buff *skb;
4855         struct net *net = dev_net(ifa->idev->dev);
4856         int err = -ENOBUFS;
4857
4858         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4859         if (!skb)
4860                 goto errout;
4861
4862         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4863         if (err < 0) {
4864                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4865                 WARN_ON(err == -EMSGSIZE);
4866                 kfree_skb(skb);
4867                 goto errout;
4868         }
4869         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4870         return;
4871 errout:
4872         if (err < 0)
4873                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4874 }
4875
4876 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4877                                 __s32 *array, int bytes)
4878 {
4879         BUG_ON(bytes < (DEVCONF_MAX * 4));
4880
4881         memset(array, 0, bytes);
4882         array[DEVCONF_FORWARDING] = cnf->forwarding;
4883         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4884         array[DEVCONF_MTU6] = cnf->mtu6;
4885         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4886         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4887         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4888         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4889         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4890         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4891                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4892         array[DEVCONF_RTR_SOLICIT_DELAY] =
4893                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4894         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4895         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4896                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4897         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4898                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4899         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4900         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4901         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4902         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4903         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4904         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4905         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4906         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4907         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4908 #ifdef CONFIG_IPV6_ROUTER_PREF
4909         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4910         array[DEVCONF_RTR_PROBE_INTERVAL] =
4911                 jiffies_to_msecs(cnf->rtr_probe_interval);
4912 #ifdef CONFIG_IPV6_ROUTE_INFO
4913         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4914 #endif
4915 #endif
4916         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4917         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4918 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4919         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4920         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4921 #endif
4922 #ifdef CONFIG_IPV6_MROUTE
4923         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4924 #endif
4925         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4926         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4927         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4928         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4929         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4930         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4931         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4932         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4933         /* we omit DEVCONF_STABLE_SECRET for now */
4934         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4935         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4936         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4937         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4938 }
4939
4940 static inline size_t inet6_ifla6_size(void)
4941 {
4942         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4943              + nla_total_size(sizeof(struct ifla_cacheinfo))
4944              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4945              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4946              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4947              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4948 }
4949
4950 static inline size_t inet6_if_nlmsg_size(void)
4951 {
4952         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4953                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4954                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4955                + nla_total_size(4) /* IFLA_MTU */
4956                + nla_total_size(4) /* IFLA_LINK */
4957                + nla_total_size(1) /* IFLA_OPERSTATE */
4958                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4959 }
4960
4961 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4962                                       int items, int bytes)
4963 {
4964         int i;
4965         int pad = bytes - sizeof(u64) * items;
4966         BUG_ON(pad < 0);
4967
4968         /* Use put_unaligned() because stats may not be aligned for u64. */
4969         put_unaligned(items, &stats[0]);
4970         for (i = 1; i < items; i++)
4971                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4972
4973         memset(&stats[items], 0, pad);
4974 }
4975
4976 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4977                                         int bytes, size_t syncpoff)
4978 {
4979         int i, c;
4980         u64 buff[IPSTATS_MIB_MAX];
4981         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4982
4983         BUG_ON(pad < 0);
4984
4985         memset(buff, 0, sizeof(buff));
4986         buff[0] = IPSTATS_MIB_MAX;
4987
4988         for_each_possible_cpu(c) {
4989                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4990                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4991         }
4992
4993         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4994         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4995 }
4996
4997 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4998                              int bytes)
4999 {
5000         switch (attrtype) {
5001         case IFLA_INET6_STATS:
5002                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5003                                      offsetof(struct ipstats_mib, syncp));
5004                 break;
5005         case IFLA_INET6_ICMP6STATS:
5006                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
5007                 break;
5008         }
5009 }
5010
5011 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5012                                   u32 ext_filter_mask)
5013 {
5014         struct nlattr *nla;
5015         struct ifla_cacheinfo ci;
5016
5017         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5018                 goto nla_put_failure;
5019         ci.max_reasm_len = IPV6_MAXPLEN;
5020         ci.tstamp = cstamp_delta(idev->tstamp);
5021         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5022         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5023         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5024                 goto nla_put_failure;
5025         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5026         if (!nla)
5027                 goto nla_put_failure;
5028         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5029
5030         /* XXX - MC not implemented */
5031
5032         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5033                 return 0;
5034
5035         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5036         if (!nla)
5037                 goto nla_put_failure;
5038         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5039
5040         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5041         if (!nla)
5042                 goto nla_put_failure;
5043         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5044
5045         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5046         if (!nla)
5047                 goto nla_put_failure;
5048
5049         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5050                 goto nla_put_failure;
5051
5052         read_lock_bh(&idev->lock);
5053         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5054         read_unlock_bh(&idev->lock);
5055
5056         return 0;
5057
5058 nla_put_failure:
5059         return -EMSGSIZE;
5060 }
5061
5062 static size_t inet6_get_link_af_size(const struct net_device *dev,
5063                                      u32 ext_filter_mask)
5064 {
5065         if (!__in6_dev_get(dev))
5066                 return 0;
5067
5068         return inet6_ifla6_size();
5069 }
5070
5071 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5072                               u32 ext_filter_mask)
5073 {
5074         struct inet6_dev *idev = __in6_dev_get(dev);
5075
5076         if (!idev)
5077                 return -ENODATA;
5078
5079         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5080                 return -EMSGSIZE;
5081
5082         return 0;
5083 }
5084
5085 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5086 {
5087         struct inet6_ifaddr *ifp;
5088         struct net_device *dev = idev->dev;
5089         bool clear_token, update_rs = false;
5090         struct in6_addr ll_addr;
5091
5092         ASSERT_RTNL();
5093
5094         if (!token)
5095                 return -EINVAL;
5096         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5097                 return -EINVAL;
5098         if (!ipv6_accept_ra(idev))
5099                 return -EINVAL;
5100         if (idev->cnf.rtr_solicits <= 0)
5101                 return -EINVAL;
5102
5103         write_lock_bh(&idev->lock);
5104
5105         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5106         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5107
5108         write_unlock_bh(&idev->lock);
5109
5110         clear_token = ipv6_addr_any(token);
5111         if (clear_token)
5112                 goto update_lft;
5113
5114         if (!idev->dead && (idev->if_flags & IF_READY) &&
5115             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5116                              IFA_F_OPTIMISTIC)) {
5117                 /* If we're not ready, then normal ifup will take care
5118                  * of this. Otherwise, we need to request our rs here.
5119                  */
5120                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5121                 update_rs = true;
5122         }
5123
5124 update_lft:
5125         write_lock_bh(&idev->lock);
5126
5127         if (update_rs) {
5128                 idev->if_flags |= IF_RS_SENT;
5129                 idev->rs_probes = 1;
5130                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5131         }
5132
5133         /* Well, that's kinda nasty ... */
5134         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5135                 spin_lock(&ifp->lock);
5136                 if (ifp->tokenized) {
5137                         ifp->valid_lft = 0;
5138                         ifp->prefered_lft = 0;
5139                 }
5140                 spin_unlock(&ifp->lock);
5141         }
5142
5143         write_unlock_bh(&idev->lock);
5144         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5145         addrconf_verify_rtnl();
5146         return 0;
5147 }
5148
5149 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5150         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5151         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5152 };
5153
5154 static int inet6_validate_link_af(const struct net_device *dev,
5155                                   const struct nlattr *nla)
5156 {
5157         struct nlattr *tb[IFLA_INET6_MAX + 1];
5158
5159         if (dev && !__in6_dev_get(dev))
5160                 return -EAFNOSUPPORT;
5161
5162         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5163 }
5164
5165 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5166 {
5167         int err = -EINVAL;
5168         struct inet6_dev *idev = __in6_dev_get(dev);
5169         struct nlattr *tb[IFLA_INET6_MAX + 1];
5170
5171         if (!idev)
5172                 return -EAFNOSUPPORT;
5173
5174         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5175                 BUG();
5176
5177         if (tb[IFLA_INET6_TOKEN]) {
5178                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5179                 if (err)
5180                         return err;
5181         }
5182
5183         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5184                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5185
5186                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5187                     mode != IN6_ADDR_GEN_MODE_NONE &&
5188                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5189                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5190                         return -EINVAL;
5191
5192                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5193                     !idev->cnf.stable_secret.initialized &&
5194                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5195                         return -EINVAL;
5196
5197                 idev->addr_gen_mode = mode;
5198                 err = 0;
5199         }
5200
5201         return err;
5202 }
5203
5204 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5205                              u32 portid, u32 seq, int event, unsigned int flags)
5206 {
5207         struct net_device *dev = idev->dev;
5208         struct ifinfomsg *hdr;
5209         struct nlmsghdr *nlh;
5210         void *protoinfo;
5211
5212         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5213         if (!nlh)
5214                 return -EMSGSIZE;
5215
5216         hdr = nlmsg_data(nlh);
5217         hdr->ifi_family = AF_INET6;
5218         hdr->__ifi_pad = 0;
5219         hdr->ifi_type = dev->type;
5220         hdr->ifi_index = dev->ifindex;
5221         hdr->ifi_flags = dev_get_flags(dev);
5222         hdr->ifi_change = 0;
5223
5224         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5225             (dev->addr_len &&
5226              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5227             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5228             (dev->ifindex != dev_get_iflink(dev) &&
5229              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5230             nla_put_u8(skb, IFLA_OPERSTATE,
5231                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5232                 goto nla_put_failure;
5233         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5234         if (!protoinfo)
5235                 goto nla_put_failure;
5236
5237         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5238                 goto nla_put_failure;
5239
5240         nla_nest_end(skb, protoinfo);
5241         nlmsg_end(skb, nlh);
5242         return 0;
5243
5244 nla_put_failure:
5245         nlmsg_cancel(skb, nlh);
5246         return -EMSGSIZE;
5247 }
5248
5249 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5250 {
5251         struct net *net = sock_net(skb->sk);
5252         int h, s_h;
5253         int idx = 0, s_idx;
5254         struct net_device *dev;
5255         struct inet6_dev *idev;
5256         struct hlist_head *head;
5257
5258         s_h = cb->args[0];
5259         s_idx = cb->args[1];
5260
5261         rcu_read_lock();
5262         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5263                 idx = 0;
5264                 head = &net->dev_index_head[h];
5265                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5266                         if (idx < s_idx)
5267                                 goto cont;
5268                         idev = __in6_dev_get(dev);
5269                         if (!idev)
5270                                 goto cont;
5271                         if (inet6_fill_ifinfo(skb, idev,
5272                                               NETLINK_CB(cb->skb).portid,
5273                                               cb->nlh->nlmsg_seq,
5274                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5275                                 goto out;
5276 cont:
5277                         idx++;
5278                 }
5279         }
5280 out:
5281         rcu_read_unlock();
5282         cb->args[1] = idx;
5283         cb->args[0] = h;
5284
5285         return skb->len;
5286 }
5287
5288 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5289 {
5290         struct sk_buff *skb;
5291         struct net *net = dev_net(idev->dev);
5292         int err = -ENOBUFS;
5293
5294         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5295         if (!skb)
5296                 goto errout;
5297
5298         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5299         if (err < 0) {
5300                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5301                 WARN_ON(err == -EMSGSIZE);
5302                 kfree_skb(skb);
5303                 goto errout;
5304         }
5305         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5306         return;
5307 errout:
5308         if (err < 0)
5309                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5310 }
5311
5312 static inline size_t inet6_prefix_nlmsg_size(void)
5313 {
5314         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5315                + nla_total_size(sizeof(struct in6_addr))
5316                + nla_total_size(sizeof(struct prefix_cacheinfo));
5317 }
5318
5319 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5320                              struct prefix_info *pinfo, u32 portid, u32 seq,
5321                              int event, unsigned int flags)
5322 {
5323         struct prefixmsg *pmsg;
5324         struct nlmsghdr *nlh;
5325         struct prefix_cacheinfo ci;
5326
5327         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5328         if (!nlh)
5329                 return -EMSGSIZE;
5330
5331         pmsg = nlmsg_data(nlh);
5332         pmsg->prefix_family = AF_INET6;
5333         pmsg->prefix_pad1 = 0;
5334         pmsg->prefix_pad2 = 0;
5335         pmsg->prefix_ifindex = idev->dev->ifindex;
5336         pmsg->prefix_len = pinfo->prefix_len;
5337         pmsg->prefix_type = pinfo->type;
5338         pmsg->prefix_pad3 = 0;
5339         pmsg->prefix_flags = 0;
5340         if (pinfo->onlink)
5341                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5342         if (pinfo->autoconf)
5343                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5344
5345         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5346                 goto nla_put_failure;
5347         ci.preferred_time = ntohl(pinfo->prefered);
5348         ci.valid_time = ntohl(pinfo->valid);
5349         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5350                 goto nla_put_failure;
5351         nlmsg_end(skb, nlh);
5352         return 0;
5353
5354 nla_put_failure:
5355         nlmsg_cancel(skb, nlh);
5356         return -EMSGSIZE;
5357 }
5358
5359 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5360                          struct prefix_info *pinfo)
5361 {
5362         struct sk_buff *skb;
5363         struct net *net = dev_net(idev->dev);
5364         int err = -ENOBUFS;
5365
5366         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5367         if (!skb)
5368                 goto errout;
5369
5370         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5371         if (err < 0) {
5372                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5373                 WARN_ON(err == -EMSGSIZE);
5374                 kfree_skb(skb);
5375                 goto errout;
5376         }
5377         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5378         return;
5379 errout:
5380         if (err < 0)
5381                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5382 }
5383
5384 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5385 {
5386         struct net *net = dev_net(ifp->idev->dev);
5387
5388         if (event)
5389                 ASSERT_RTNL();
5390
5391         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5392
5393         switch (event) {
5394         case RTM_NEWADDR:
5395                 /*
5396                  * If the address was optimistic
5397                  * we inserted the route at the start of
5398                  * our DAD process, so we don't need
5399                  * to do it again
5400                  */
5401                 if (!(ifp->rt->rt6i_node))
5402                         ip6_ins_rt(ifp->rt);
5403                 if (ifp->idev->cnf.forwarding)
5404                         addrconf_join_anycast(ifp);
5405                 if (!ipv6_addr_any(&ifp->peer_addr))
5406                         addrconf_prefix_route(&ifp->peer_addr, 128,
5407                                               ifp->idev->dev, 0, 0);
5408                 break;
5409         case RTM_DELADDR:
5410                 if (ifp->idev->cnf.forwarding)
5411                         addrconf_leave_anycast(ifp);
5412                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5413                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5414                         struct rt6_info *rt;
5415
5416                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5417                                                        ifp->idev->dev, 0, 0);
5418                         if (rt)
5419                                 ip6_del_rt(rt);
5420                 }
5421                 if (ifp->rt) {
5422                         dst_hold(&ifp->rt->dst);
5423                         ip6_del_rt(ifp->rt);
5424                 }
5425                 rt_genid_bump_ipv6(net);
5426                 break;
5427         }
5428         atomic_inc(&net->ipv6.dev_addr_genid);
5429 }
5430
5431 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5432 {
5433         rcu_read_lock_bh();
5434         if (likely(ifp->idev->dead == 0))
5435                 __ipv6_ifa_notify(event, ifp);
5436         rcu_read_unlock_bh();
5437 }
5438
5439 #ifdef CONFIG_SYSCTL
5440
5441 static
5442 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5443                            void __user *buffer, size_t *lenp, loff_t *ppos)
5444 {
5445         int *valp = ctl->data;
5446         int val = *valp;
5447         loff_t pos = *ppos;
5448         struct ctl_table lctl;
5449         int ret;
5450
5451         /*
5452          * ctl->data points to idev->cnf.forwarding, we should
5453          * not modify it until we get the rtnl lock.
5454          */
5455         lctl = *ctl;
5456         lctl.data = &val;
5457
5458         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5459
5460         if (write)
5461                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5462         if (ret)
5463                 *ppos = pos;
5464         return ret;
5465 }
5466
5467 static
5468 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5469                               void __user *buffer, size_t *lenp, loff_t *ppos)
5470 {
5471         struct ctl_table lctl;
5472         int min_hl = 1, max_hl = 255;
5473
5474         lctl = *ctl;
5475         lctl.extra1 = &min_hl;
5476         lctl.extra2 = &max_hl;
5477
5478         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5479 }
5480
5481 static
5482 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5483                         void __user *buffer, size_t *lenp, loff_t *ppos)
5484 {
5485         struct inet6_dev *idev = ctl->extra1;
5486         int min_mtu = IPV6_MIN_MTU;
5487         struct ctl_table lctl;
5488
5489         lctl = *ctl;
5490         lctl.extra1 = &min_mtu;
5491         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5492
5493         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5494 }
5495
5496 static void dev_disable_change(struct inet6_dev *idev)
5497 {
5498         struct netdev_notifier_info info;
5499
5500         if (!idev || !idev->dev)
5501                 return;
5502
5503         netdev_notifier_info_init(&info, idev->dev);
5504         if (idev->cnf.disable_ipv6)
5505                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5506         else
5507                 addrconf_notify(NULL, NETDEV_UP, &info);
5508 }
5509
5510 static void addrconf_disable_change(struct net *net, __s32 newf)
5511 {
5512         struct net_device *dev;
5513         struct inet6_dev *idev;
5514
5515         rcu_read_lock();
5516         for_each_netdev_rcu(net, dev) {
5517                 idev = __in6_dev_get(dev);
5518                 if (idev) {
5519                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5520                         idev->cnf.disable_ipv6 = newf;
5521                         if (changed)
5522                                 dev_disable_change(idev);
5523                 }
5524         }
5525         rcu_read_unlock();
5526 }
5527
5528 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5529 {
5530         struct net *net;
5531         int old;
5532
5533         if (!rtnl_trylock())
5534                 return restart_syscall();
5535
5536         net = (struct net *)table->extra2;
5537         old = *p;
5538         *p = newf;
5539
5540         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5541                 rtnl_unlock();
5542                 return 0;
5543         }
5544
5545         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5546                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5547                 addrconf_disable_change(net, newf);
5548         } else if ((!newf) ^ (!old))
5549                 dev_disable_change((struct inet6_dev *)table->extra1);
5550
5551         rtnl_unlock();
5552         return 0;
5553 }
5554
5555 static
5556 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5557                             void __user *buffer, size_t *lenp, loff_t *ppos)
5558 {
5559         int *valp = ctl->data;
5560         int val = *valp;
5561         loff_t pos = *ppos;
5562         struct ctl_table lctl;
5563         int ret;
5564
5565         /*
5566          * ctl->data points to idev->cnf.disable_ipv6, we should
5567          * not modify it until we get the rtnl lock.
5568          */
5569         lctl = *ctl;
5570         lctl.data = &val;
5571
5572         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5573
5574         if (write)
5575                 ret = addrconf_disable_ipv6(ctl, valp, val);
5576         if (ret)
5577                 *ppos = pos;
5578         return ret;
5579 }
5580
5581 static
5582 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5583                               void __user *buffer, size_t *lenp, loff_t *ppos)
5584 {
5585         int *valp = ctl->data;
5586         int ret;
5587         int old, new;
5588
5589         old = *valp;
5590         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5591         new = *valp;
5592
5593         if (write && old != new) {
5594                 struct net *net = ctl->extra2;
5595
5596                 if (!rtnl_trylock())
5597                         return restart_syscall();
5598
5599                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5600                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5601                                                      NETCONFA_IFINDEX_DEFAULT,
5602                                                      net->ipv6.devconf_dflt);
5603                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5604                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5605                                                      NETCONFA_IFINDEX_ALL,
5606                                                      net->ipv6.devconf_all);
5607                 else {
5608                         struct inet6_dev *idev = ctl->extra1;
5609
5610                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5611                                                      idev->dev->ifindex,
5612                                                      &idev->cnf);
5613                 }
5614                 rtnl_unlock();
5615         }
5616
5617         return ret;
5618 }
5619
5620 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5621                                          void __user *buffer, size_t *lenp,
5622                                          loff_t *ppos)
5623 {
5624         int err;
5625         struct in6_addr addr;
5626         char str[IPV6_MAX_STRLEN];
5627         struct ctl_table lctl = *ctl;
5628         struct net *net = ctl->extra2;
5629         struct ipv6_stable_secret *secret = ctl->data;
5630
5631         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5632                 return -EIO;
5633
5634         lctl.maxlen = IPV6_MAX_STRLEN;
5635         lctl.data = str;
5636
5637         if (!rtnl_trylock())
5638                 return restart_syscall();
5639
5640         if (!write && !secret->initialized) {
5641                 err = -EIO;
5642                 goto out;
5643         }
5644
5645         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5646         if (err >= sizeof(str)) {
5647                 err = -EIO;
5648                 goto out;
5649         }
5650
5651         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5652         if (err || !write)
5653                 goto out;
5654
5655         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5656                 err = -EIO;
5657                 goto out;
5658         }
5659
5660         secret->initialized = true;
5661         secret->secret = addr;
5662
5663         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5664                 struct net_device *dev;
5665
5666                 for_each_netdev(net, dev) {
5667                         struct inet6_dev *idev = __in6_dev_get(dev);
5668
5669                         if (idev) {
5670                                 idev->addr_gen_mode =
5671                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5672                         }
5673                 }
5674         } else {
5675                 struct inet6_dev *idev = ctl->extra1;
5676
5677                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5678         }
5679
5680 out:
5681         rtnl_unlock();
5682
5683         return err;
5684 }
5685
5686 static
5687 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5688                                                 int write,
5689                                                 void __user *buffer,
5690                                                 size_t *lenp,
5691                                                 loff_t *ppos)
5692 {
5693         int *valp = ctl->data;
5694         int val = *valp;
5695         loff_t pos = *ppos;
5696         struct ctl_table lctl;
5697         int ret;
5698
5699         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5700          * we should not modify it until we get the rtnl lock.
5701          */
5702         lctl = *ctl;
5703         lctl.data = &val;
5704
5705         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5706
5707         if (write)
5708                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5709         if (ret)
5710                 *ppos = pos;
5711         return ret;
5712 }
5713
5714 static const struct ctl_table addrconf_sysctl[] = {
5715         {
5716                 .procname       = "forwarding",
5717                 .data           = &ipv6_devconf.forwarding,
5718                 .maxlen         = sizeof(int),
5719                 .mode           = 0644,
5720                 .proc_handler   = addrconf_sysctl_forward,
5721         },
5722         {
5723                 .procname       = "hop_limit",
5724                 .data           = &ipv6_devconf.hop_limit,
5725                 .maxlen         = sizeof(int),
5726                 .mode           = 0644,
5727                 .proc_handler   = addrconf_sysctl_hop_limit,
5728         },
5729         {
5730                 .procname       = "mtu",
5731                 .data           = &ipv6_devconf.mtu6,
5732                 .maxlen         = sizeof(int),
5733                 .mode           = 0644,
5734                 .proc_handler   = addrconf_sysctl_mtu,
5735         },
5736         {
5737                 .procname       = "accept_ra",
5738                 .data           = &ipv6_devconf.accept_ra,
5739                 .maxlen         = sizeof(int),
5740                 .mode           = 0644,
5741                 .proc_handler   = proc_dointvec,
5742         },
5743         {
5744                 .procname       = "accept_redirects",
5745                 .data           = &ipv6_devconf.accept_redirects,
5746                 .maxlen         = sizeof(int),
5747                 .mode           = 0644,
5748                 .proc_handler   = proc_dointvec,
5749         },
5750         {
5751                 .procname       = "autoconf",
5752                 .data           = &ipv6_devconf.autoconf,
5753                 .maxlen         = sizeof(int),
5754                 .mode           = 0644,
5755                 .proc_handler   = proc_dointvec,
5756         },
5757         {
5758                 .procname       = "dad_transmits",
5759                 .data           = &ipv6_devconf.dad_transmits,
5760                 .maxlen         = sizeof(int),
5761                 .mode           = 0644,
5762                 .proc_handler   = proc_dointvec,
5763         },
5764         {
5765                 .procname       = "router_solicitations",
5766                 .data           = &ipv6_devconf.rtr_solicits,
5767                 .maxlen         = sizeof(int),
5768                 .mode           = 0644,
5769                 .proc_handler   = proc_dointvec,
5770         },
5771         {
5772                 .procname       = "router_solicitation_interval",
5773                 .data           = &ipv6_devconf.rtr_solicit_interval,
5774                 .maxlen         = sizeof(int),
5775                 .mode           = 0644,
5776                 .proc_handler   = proc_dointvec_jiffies,
5777         },
5778         {
5779                 .procname       = "router_solicitation_delay",
5780                 .data           = &ipv6_devconf.rtr_solicit_delay,
5781                 .maxlen         = sizeof(int),
5782                 .mode           = 0644,
5783                 .proc_handler   = proc_dointvec_jiffies,
5784         },
5785         {
5786                 .procname       = "force_mld_version",
5787                 .data           = &ipv6_devconf.force_mld_version,
5788                 .maxlen         = sizeof(int),
5789                 .mode           = 0644,
5790                 .proc_handler   = proc_dointvec,
5791         },
5792         {
5793                 .procname       = "mldv1_unsolicited_report_interval",
5794                 .data           =
5795                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5796                 .maxlen         = sizeof(int),
5797                 .mode           = 0644,
5798                 .proc_handler   = proc_dointvec_ms_jiffies,
5799         },
5800         {
5801                 .procname       = "mldv2_unsolicited_report_interval",
5802                 .data           =
5803                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5804                 .maxlen         = sizeof(int),
5805                 .mode           = 0644,
5806                 .proc_handler   = proc_dointvec_ms_jiffies,
5807         },
5808         {
5809                 .procname       = "use_tempaddr",
5810                 .data           = &ipv6_devconf.use_tempaddr,
5811                 .maxlen         = sizeof(int),
5812                 .mode           = 0644,
5813                 .proc_handler   = proc_dointvec,
5814         },
5815         {
5816                 .procname       = "temp_valid_lft",
5817                 .data           = &ipv6_devconf.temp_valid_lft,
5818                 .maxlen         = sizeof(int),
5819                 .mode           = 0644,
5820                 .proc_handler   = proc_dointvec,
5821         },
5822         {
5823                 .procname       = "temp_prefered_lft",
5824                 .data           = &ipv6_devconf.temp_prefered_lft,
5825                 .maxlen         = sizeof(int),
5826                 .mode           = 0644,
5827                 .proc_handler   = proc_dointvec,
5828         },
5829         {
5830                 .procname       = "regen_max_retry",
5831                 .data           = &ipv6_devconf.regen_max_retry,
5832                 .maxlen         = sizeof(int),
5833                 .mode           = 0644,
5834                 .proc_handler   = proc_dointvec,
5835         },
5836         {
5837                 .procname       = "max_desync_factor",
5838                 .data           = &ipv6_devconf.max_desync_factor,
5839                 .maxlen         = sizeof(int),
5840                 .mode           = 0644,
5841                 .proc_handler   = proc_dointvec,
5842         },
5843         {
5844                 .procname       = "max_addresses",
5845                 .data           = &ipv6_devconf.max_addresses,
5846                 .maxlen         = sizeof(int),
5847                 .mode           = 0644,
5848                 .proc_handler   = proc_dointvec,
5849         },
5850         {
5851                 .procname       = "accept_ra_defrtr",
5852                 .data           = &ipv6_devconf.accept_ra_defrtr,
5853                 .maxlen         = sizeof(int),
5854                 .mode           = 0644,
5855                 .proc_handler   = proc_dointvec,
5856         },
5857         {
5858                 .procname       = "accept_ra_min_hop_limit",
5859                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5860                 .maxlen         = sizeof(int),
5861                 .mode           = 0644,
5862                 .proc_handler   = proc_dointvec,
5863         },
5864         {
5865                 .procname       = "accept_ra_pinfo",
5866                 .data           = &ipv6_devconf.accept_ra_pinfo,
5867                 .maxlen         = sizeof(int),
5868                 .mode           = 0644,
5869                 .proc_handler   = proc_dointvec,
5870         },
5871 #ifdef CONFIG_IPV6_ROUTER_PREF
5872         {
5873                 .procname       = "accept_ra_rtr_pref",
5874                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5875                 .maxlen         = sizeof(int),
5876                 .mode           = 0644,
5877                 .proc_handler   = proc_dointvec,
5878         },
5879         {
5880                 .procname       = "router_probe_interval",
5881                 .data           = &ipv6_devconf.rtr_probe_interval,
5882                 .maxlen         = sizeof(int),
5883                 .mode           = 0644,
5884                 .proc_handler   = proc_dointvec_jiffies,
5885         },
5886 #ifdef CONFIG_IPV6_ROUTE_INFO
5887         {
5888                 .procname       = "accept_ra_rt_info_max_plen",
5889                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5890                 .maxlen         = sizeof(int),
5891                 .mode           = 0644,
5892                 .proc_handler   = proc_dointvec,
5893         },
5894 #endif
5895 #endif
5896         {
5897                 .procname       = "proxy_ndp",
5898                 .data           = &ipv6_devconf.proxy_ndp,
5899                 .maxlen         = sizeof(int),
5900                 .mode           = 0644,
5901                 .proc_handler   = addrconf_sysctl_proxy_ndp,
5902         },
5903         {
5904                 .procname       = "accept_source_route",
5905                 .data           = &ipv6_devconf.accept_source_route,
5906                 .maxlen         = sizeof(int),
5907                 .mode           = 0644,
5908                 .proc_handler   = proc_dointvec,
5909         },
5910 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5911         {
5912                 .procname       = "optimistic_dad",
5913                 .data           = &ipv6_devconf.optimistic_dad,
5914                 .maxlen         = sizeof(int),
5915                 .mode           = 0644,
5916                 .proc_handler   = proc_dointvec,
5917         },
5918         {
5919                 .procname       = "use_optimistic",
5920                 .data           = &ipv6_devconf.use_optimistic,
5921                 .maxlen         = sizeof(int),
5922                 .mode           = 0644,
5923                 .proc_handler   = proc_dointvec,
5924         },
5925 #endif
5926 #ifdef CONFIG_IPV6_MROUTE
5927         {
5928                 .procname       = "mc_forwarding",
5929                 .data           = &ipv6_devconf.mc_forwarding,
5930                 .maxlen         = sizeof(int),
5931                 .mode           = 0444,
5932                 .proc_handler   = proc_dointvec,
5933         },
5934 #endif
5935         {
5936                 .procname       = "disable_ipv6",
5937                 .data           = &ipv6_devconf.disable_ipv6,
5938                 .maxlen         = sizeof(int),
5939                 .mode           = 0644,
5940                 .proc_handler   = addrconf_sysctl_disable,
5941         },
5942         {
5943                 .procname       = "accept_dad",
5944                 .data           = &ipv6_devconf.accept_dad,
5945                 .maxlen         = sizeof(int),
5946                 .mode           = 0644,
5947                 .proc_handler   = proc_dointvec,
5948         },
5949         {
5950                 .procname       = "force_tllao",
5951                 .data           = &ipv6_devconf.force_tllao,
5952                 .maxlen         = sizeof(int),
5953                 .mode           = 0644,
5954                 .proc_handler   = proc_dointvec
5955         },
5956         {
5957                 .procname       = "ndisc_notify",
5958                 .data           = &ipv6_devconf.ndisc_notify,
5959                 .maxlen         = sizeof(int),
5960                 .mode           = 0644,
5961                 .proc_handler   = proc_dointvec
5962         },
5963         {
5964                 .procname       = "suppress_frag_ndisc",
5965                 .data           = &ipv6_devconf.suppress_frag_ndisc,
5966                 .maxlen         = sizeof(int),
5967                 .mode           = 0644,
5968                 .proc_handler   = proc_dointvec
5969         },
5970         {
5971                 .procname       = "accept_ra_from_local",
5972                 .data           = &ipv6_devconf.accept_ra_from_local,
5973                 .maxlen         = sizeof(int),
5974                 .mode           = 0644,
5975                 .proc_handler   = proc_dointvec,
5976         },
5977         {
5978                 .procname       = "accept_ra_mtu",
5979                 .data           = &ipv6_devconf.accept_ra_mtu,
5980                 .maxlen         = sizeof(int),
5981                 .mode           = 0644,
5982                 .proc_handler   = proc_dointvec,
5983         },
5984         {
5985                 .procname       = "stable_secret",
5986                 .data           = &ipv6_devconf.stable_secret,
5987                 .maxlen         = IPV6_MAX_STRLEN,
5988                 .mode           = 0600,
5989                 .proc_handler   = addrconf_sysctl_stable_secret,
5990         },
5991         {
5992                 .procname       = "use_oif_addrs_only",
5993                 .data           = &ipv6_devconf.use_oif_addrs_only,
5994                 .maxlen         = sizeof(int),
5995                 .mode           = 0644,
5996                 .proc_handler   = proc_dointvec,
5997         },
5998         {
5999                 .procname       = "ignore_routes_with_linkdown",
6000                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6001                 .maxlen         = sizeof(int),
6002                 .mode           = 0644,
6003                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6004         },
6005         {
6006                 .procname       = "drop_unicast_in_l2_multicast",
6007                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6008                 .maxlen         = sizeof(int),
6009                 .mode           = 0644,
6010                 .proc_handler   = proc_dointvec,
6011         },
6012         {
6013                 .procname       = "drop_unsolicited_na",
6014                 .data           = &ipv6_devconf.drop_unsolicited_na,
6015                 .maxlen         = sizeof(int),
6016                 .mode           = 0644,
6017                 .proc_handler   = proc_dointvec,
6018         },
6019         {
6020                 .procname       = "keep_addr_on_down",
6021                 .data           = &ipv6_devconf.keep_addr_on_down,
6022                 .maxlen         = sizeof(int),
6023                 .mode           = 0644,
6024                 .proc_handler   = proc_dointvec,
6025
6026         },
6027         {
6028                 /* sentinel */
6029         }
6030 };
6031
6032 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6033                 struct inet6_dev *idev, struct ipv6_devconf *p)
6034 {
6035         int i, ifindex;
6036         struct ctl_table *table;
6037         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6038
6039         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6040         if (!table)
6041                 goto out;
6042
6043         for (i = 0; table[i].data; i++) {
6044                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6045                 table[i].extra1 = idev; /* embedded; no ref */
6046                 table[i].extra2 = net;
6047         }
6048
6049         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6050
6051         p->sysctl_header = register_net_sysctl(net, path, table);
6052         if (!p->sysctl_header)
6053                 goto free;
6054
6055         if (!strcmp(dev_name, "all"))
6056                 ifindex = NETCONFA_IFINDEX_ALL;
6057         else if (!strcmp(dev_name, "default"))
6058                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6059         else
6060                 ifindex = idev->dev->ifindex;
6061         inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6062         return 0;
6063
6064 free:
6065         kfree(table);
6066 out:
6067         return -ENOBUFS;
6068 }
6069
6070 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6071 {
6072         struct ctl_table *table;
6073
6074         if (!p->sysctl_header)
6075                 return;
6076
6077         table = p->sysctl_header->ctl_table_arg;
6078         unregister_net_sysctl_table(p->sysctl_header);
6079         p->sysctl_header = NULL;
6080         kfree(table);
6081 }
6082
6083 static int addrconf_sysctl_register(struct inet6_dev *idev)
6084 {
6085         int err;
6086
6087         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6088                 return -EINVAL;
6089
6090         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6091                                     &ndisc_ifinfo_sysctl_change);
6092         if (err)
6093                 return err;
6094         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6095                                          idev, &idev->cnf);
6096         if (err)
6097                 neigh_sysctl_unregister(idev->nd_parms);
6098
6099         return err;
6100 }
6101
6102 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6103 {
6104         __addrconf_sysctl_unregister(&idev->cnf);
6105         neigh_sysctl_unregister(idev->nd_parms);
6106 }
6107
6108
6109 #endif
6110
6111 static int __net_init addrconf_init_net(struct net *net)
6112 {
6113         int err = -ENOMEM;
6114         struct ipv6_devconf *all, *dflt;
6115
6116         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6117         if (!all)
6118                 goto err_alloc_all;
6119
6120         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6121         if (!dflt)
6122                 goto err_alloc_dflt;
6123
6124         /* these will be inherited by all namespaces */
6125         dflt->autoconf = ipv6_defaults.autoconf;
6126         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6127
6128         dflt->stable_secret.initialized = false;
6129         all->stable_secret.initialized = false;
6130
6131         net->ipv6.devconf_all = all;
6132         net->ipv6.devconf_dflt = dflt;
6133
6134 #ifdef CONFIG_SYSCTL
6135         err = __addrconf_sysctl_register(net, "all", NULL, all);
6136         if (err < 0)
6137                 goto err_reg_all;
6138
6139         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6140         if (err < 0)
6141                 goto err_reg_dflt;
6142 #endif
6143         return 0;
6144
6145 #ifdef CONFIG_SYSCTL
6146 err_reg_dflt:
6147         __addrconf_sysctl_unregister(all);
6148 err_reg_all:
6149         kfree(dflt);
6150 #endif
6151 err_alloc_dflt:
6152         kfree(all);
6153 err_alloc_all:
6154         return err;
6155 }
6156
6157 static void __net_exit addrconf_exit_net(struct net *net)
6158 {
6159 #ifdef CONFIG_SYSCTL
6160         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6161         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6162 #endif
6163         kfree(net->ipv6.devconf_dflt);
6164         kfree(net->ipv6.devconf_all);
6165 }
6166
6167 static struct pernet_operations addrconf_ops = {
6168         .init = addrconf_init_net,
6169         .exit = addrconf_exit_net,
6170 };
6171
6172 static struct rtnl_af_ops inet6_ops __read_mostly = {
6173         .family           = AF_INET6,
6174         .fill_link_af     = inet6_fill_link_af,
6175         .get_link_af_size = inet6_get_link_af_size,
6176         .validate_link_af = inet6_validate_link_af,
6177         .set_link_af      = inet6_set_link_af,
6178 };
6179
6180 /*
6181  *      Init / cleanup code
6182  */
6183
6184 int __init addrconf_init(void)
6185 {
6186         struct inet6_dev *idev;
6187         int i, err;
6188
6189         err = ipv6_addr_label_init();
6190         if (err < 0) {
6191                 pr_crit("%s: cannot initialize default policy table: %d\n",
6192                         __func__, err);
6193                 goto out;
6194         }
6195
6196         err = register_pernet_subsys(&addrconf_ops);
6197         if (err < 0)
6198                 goto out_addrlabel;
6199
6200         addrconf_wq = create_workqueue("ipv6_addrconf");
6201         if (!addrconf_wq) {
6202                 err = -ENOMEM;
6203                 goto out_nowq;
6204         }
6205
6206         /* The addrconf netdev notifier requires that loopback_dev
6207          * has it's ipv6 private information allocated and setup
6208          * before it can bring up and give link-local addresses
6209          * to other devices which are up.
6210          *
6211          * Unfortunately, loopback_dev is not necessarily the first
6212          * entry in the global dev_base list of net devices.  In fact,
6213          * it is likely to be the very last entry on that list.
6214          * So this causes the notifier registry below to try and
6215          * give link-local addresses to all devices besides loopback_dev
6216          * first, then loopback_dev, which cases all the non-loopback_dev
6217          * devices to fail to get a link-local address.
6218          *
6219          * So, as a temporary fix, allocate the ipv6 structure for
6220          * loopback_dev first by hand.
6221          * Longer term, all of the dependencies ipv6 has upon the loopback
6222          * device and it being up should be removed.
6223          */
6224         rtnl_lock();
6225         idev = ipv6_add_dev(init_net.loopback_dev);
6226         rtnl_unlock();
6227         if (IS_ERR(idev)) {
6228                 err = PTR_ERR(idev);
6229                 goto errlo;
6230         }
6231
6232         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6233                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6234
6235         register_netdevice_notifier(&ipv6_dev_notf);
6236
6237         addrconf_verify();
6238
6239         rtnl_af_register(&inet6_ops);
6240
6241         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6242                               NULL);
6243         if (err < 0)
6244                 goto errout;
6245
6246         /* Only the first call to __rtnl_register can fail */
6247         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6248         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6249         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6250                         inet6_dump_ifaddr, NULL);
6251         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6252                         inet6_dump_ifmcaddr, NULL);
6253         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6254                         inet6_dump_ifacaddr, NULL);
6255         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6256                         inet6_netconf_dump_devconf, NULL);
6257
6258         ipv6_addr_label_rtnl_register();
6259
6260         return 0;
6261 errout:
6262         rtnl_af_unregister(&inet6_ops);
6263         unregister_netdevice_notifier(&ipv6_dev_notf);
6264 errlo:
6265         destroy_workqueue(addrconf_wq);
6266 out_nowq:
6267         unregister_pernet_subsys(&addrconf_ops);
6268 out_addrlabel:
6269         ipv6_addr_label_cleanup();
6270 out:
6271         return err;
6272 }
6273
6274 void addrconf_cleanup(void)
6275 {
6276         struct net_device *dev;
6277         int i;
6278
6279         unregister_netdevice_notifier(&ipv6_dev_notf);
6280         unregister_pernet_subsys(&addrconf_ops);
6281         ipv6_addr_label_cleanup();
6282
6283         rtnl_lock();
6284
6285         __rtnl_af_unregister(&inet6_ops);
6286
6287         /* clean dev list */
6288         for_each_netdev(&init_net, dev) {
6289                 if (__in6_dev_get(dev) == NULL)
6290                         continue;
6291                 addrconf_ifdown(dev, 1);
6292         }
6293         addrconf_ifdown(init_net.loopback_dev, 2);
6294
6295         /*
6296          *      Check hash table.
6297          */
6298         spin_lock_bh(&addrconf_hash_lock);
6299         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6300                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6301         spin_unlock_bh(&addrconf_hash_lock);
6302         cancel_delayed_work(&addr_chk_work);
6303         rtnl_unlock();
6304
6305         destroy_workqueue(addrconf_wq);
6306 }