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/in6.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/if_addr.h>
  52 #include <linux/if_arp.h>
  53 #include <linux/if_arcnet.h>
  54 #include <linux/if_infiniband.h>
  55 #include <linux/route.h>
  56 #include <linux/inetdevice.h>
  57 #include <linux/init.h>
  58 #include <linux/slab.h>
  59 #ifdef CONFIG_SYSCTL
  60 #include <linux/sysctl.h>
  61 #endif
  62 #include <linux/capability.h>
  63 #include <linux/delay.h>
  64 #include <linux/notifier.h>
  65 #include <linux/string.h>
  66 #include <linux/hash.h>
  67
  68 #include <net/net_namespace.h>
  69 #include <net/sock.h>
  70 #include <net/snmp.h>
  71
  72 #include <net/af_ieee802154.h>
  73 #include <net/firewire.h>
  74 #include <net/ipv6.h>
  75 #include <net/protocol.h>
  76 #include <net/ndisc.h>
  77 #include <net/ip6_route.h>
  78 #include <net/addrconf.h>
  79 #include <net/tcp.h>
  80 #include <net/ip.h>
  81 #include <net/netlink.h>
  82 #include <net/pkt_sched.h>
  83 #include <linux/if_tunnel.h>
  84 #include <linux/rtnetlink.h>
  85 #include <linux/netconf.h>
  86
  87 #ifdef CONFIG_IPV6_PRIVACY
  88 #include <linux/random.h>
  89 #endif
  90
  91 #include <linux/uaccess.h>
  92 #include <asm/unaligned.h>
  93
  94 #include <linux/proc_fs.h>
  95 #include <linux/seq_file.h>
  96 #include <linux/export.h>
  97
  98 /* Set to 3 to get tracing... */
  99 #define ACONF_DEBUG 2
 100
 101 #if ACONF_DEBUG >= 3
 102 #define ADBG(x) printk x
 103 #else
 104 #define ADBG(x)
 105 #endif
 106
 107 #define INFINITY_LIFE_TIME      0xFFFFFFFF
 108
 109 static inline u32 cstamp_delta(unsigned long cstamp)
 110 {
 111         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 112 }
 113
 114 #ifdef CONFIG_SYSCTL
 115 static void addrconf_sysctl_register(struct inet6_dev *idev);
 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 117 #else
 118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 119 {
 120 }
 121
 122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 123 {
 124 }
 125 #endif
 126
 127 #ifdef CONFIG_IPV6_PRIVACY
 128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 130 static void ipv6_regen_rndid(unsigned long data);
 131 #endif
 132
 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 134 static int ipv6_count_addresses(struct inet6_dev *idev);
 135
 136 /*
 137  *      Configured unicast address hash table
 138  */
 139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 140 static DEFINE_SPINLOCK(addrconf_hash_lock);
 141
 142 static void addrconf_verify(unsigned long);
 143
 144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
 145 static DEFINE_SPINLOCK(addrconf_verify_lock);
 146
 147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 149
 150 static void addrconf_type_change(struct net_device *dev,
 151                                  unsigned long event);
 152 static int addrconf_ifdown(struct net_device *dev, int how);
 153
 154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 155                                                   int plen,
 156                                                   const struct net_device *dev,
 157                                                   u32 flags, u32 noflags);
 158
 159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 160 static void addrconf_dad_timer(unsigned long data);
 161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 162 static void addrconf_dad_run(struct inet6_dev *idev);
 163 static void addrconf_rs_timer(unsigned long data);
 164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 166
 167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 168                                 struct prefix_info *pinfo);
 169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 170                                struct net_device *dev);
 171
 172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
 173         .forwarding             = 0,
 174         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 175         .mtu6                   = IPV6_MIN_MTU,
 176         .accept_ra              = 1,
 177         .accept_redirects       = 1,
 178         .autoconf               = 1,
 179         .force_mld_version      = 0,
 180         .dad_transmits          = 1,
 181         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 182         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 183         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 184 #ifdef CONFIG_IPV6_PRIVACY
 185         .use_tempaddr           = 0,
 186         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 187         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 188         .regen_max_retry        = REGEN_MAX_RETRY,
 189         .max_desync_factor      = MAX_DESYNC_FACTOR,
 190 #endif
 191         .max_addresses          = IPV6_MAX_ADDRESSES,
 192         .accept_ra_defrtr       = 1,
 193         .accept_ra_pinfo        = 1,
 194 #ifdef CONFIG_IPV6_ROUTER_PREF
 195         .accept_ra_rtr_pref     = 1,
 196         .rtr_probe_interval     = 60 * HZ,
 197 #ifdef CONFIG_IPV6_ROUTE_INFO
 198         .accept_ra_rt_info_max_plen = 0,
 199 #endif
 200 #endif
 201         .proxy_ndp              = 0,
 202         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 203         .disable_ipv6           = 0,
 204         .accept_dad             = 1,
 205 };
 206
 207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 208         .forwarding             = 0,
 209         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
 210         .mtu6                   = IPV6_MIN_MTU,
 211         .accept_ra              = 1,
 212         .accept_redirects       = 1,
 213         .autoconf               = 1,
 214         .dad_transmits          = 1,
 215         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
 216         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
 217         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
 218 #ifdef CONFIG_IPV6_PRIVACY
 219         .use_tempaddr           = 0,
 220         .temp_valid_lft         = TEMP_VALID_LIFETIME,
 221         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
 222         .regen_max_retry        = REGEN_MAX_RETRY,
 223         .max_desync_factor      = MAX_DESYNC_FACTOR,
 224 #endif
 225         .max_addresses          = IPV6_MAX_ADDRESSES,
 226         .accept_ra_defrtr       = 1,
 227         .accept_ra_pinfo        = 1,
 228 #ifdef CONFIG_IPV6_ROUTER_PREF
 229         .accept_ra_rtr_pref     = 1,
 230         .rtr_probe_interval     = 60 * HZ,
 231 #ifdef CONFIG_IPV6_ROUTE_INFO
 232         .accept_ra_rt_info_max_plen = 0,
 233 #endif
 234 #endif
 235         .proxy_ndp              = 0,
 236         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
 237         .disable_ipv6           = 0,
 238         .accept_dad             = 1,
 239 };
 240
 241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
 242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
 244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
 245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
 246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
 247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
 248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
 249
 250 /* Check if a valid qdisc is available */
 251 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 252 {
 253         return !qdisc_tx_is_noop(dev);
 254 }
 255
 256 static void addrconf_del_rs_timer(struct inet6_dev *idev)
 257 {
 258         if (del_timer(&idev->rs_timer))
 259                 __in6_dev_put(idev);
 260 }
 261
 262 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
 263 {
 264         if (del_timer(&ifp->dad_timer))
 265                 __in6_ifa_put(ifp);
 266 }
 267
 268 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 269                                   unsigned long when)
 270 {
 271         if (!timer_pending(&idev->rs_timer))
 272                 in6_dev_hold(idev);
 273         mod_timer(&idev->rs_timer, jiffies + when);
 274 }
 275
 276 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
 277                                    unsigned long when)
 278 {
 279         if (!timer_pending(&ifp->dad_timer))
 280                 in6_ifa_hold(ifp);
 281         mod_timer(&ifp->dad_timer, jiffies + when);
 282 }
 283
 284 static int snmp6_alloc_dev(struct inet6_dev *idev)
 285 {
 286         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 287                           sizeof(struct ipstats_mib),
 288                           __alignof__(struct ipstats_mib)) < 0)
 289                 goto err_ip;
 290         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 291                                         GFP_KERNEL);
 292         if (!idev->stats.icmpv6dev)
 293                 goto err_icmp;
 294         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 295                                            GFP_KERNEL);
 296         if (!idev->stats.icmpv6msgdev)
 297                 goto err_icmpmsg;
 298
 299         return 0;
 300
 301 err_icmpmsg:
 302         kfree(idev->stats.icmpv6dev);
 303 err_icmp:
 304         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 305 err_ip:
 306         return -ENOMEM;
 307 }
 308
 309 static void snmp6_free_dev(struct inet6_dev *idev)
 310 {
 311         kfree(idev->stats.icmpv6msgdev);
 312         kfree(idev->stats.icmpv6dev);
 313         snmp_mib_free((void __percpu **)idev->stats.ipv6);
 314 }
 315
 316 /* Nobody refers to this device, we may destroy it. */
 317
 318 void in6_dev_finish_destroy(struct inet6_dev *idev)
 319 {
 320         struct net_device *dev = idev->dev;
 321
 322         WARN_ON(!list_empty(&idev->addr_list));
 323         WARN_ON(idev->mc_list != NULL);
 324         WARN_ON(timer_pending(&idev->rs_timer));
 325
 326 #ifdef NET_REFCNT_DEBUG
 327         pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
 328 #endif
 329         dev_put(dev);
 330         if (!idev->dead) {
 331                 pr_warn("Freeing alive inet6 device %p\n", idev);
 332                 return;
 333         }
 334         snmp6_free_dev(idev);
 335         kfree_rcu(idev, rcu);
 336 }
 337 EXPORT_SYMBOL(in6_dev_finish_destroy);
 338
 339 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 340 {
 341         struct inet6_dev *ndev;
 342
 343         ASSERT_RTNL();
 344
 345         if (dev->mtu < IPV6_MIN_MTU)
 346                 return NULL;
 347
 348         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 349
 350         if (ndev == NULL)
 351                 return NULL;
 352
 353         rwlock_init(&ndev->lock);
 354         ndev->dev = dev;
 355         INIT_LIST_HEAD(&ndev->addr_list);
 356         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 357                     (unsigned long)ndev);
 358         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 359         ndev->cnf.mtu6 = dev->mtu;
 360         ndev->cnf.sysctl = NULL;
 361         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 362         if (ndev->nd_parms == NULL) {
 363                 kfree(ndev);
 364                 return NULL;
 365         }
 366         if (ndev->cnf.forwarding)
 367                 dev_disable_lro(dev);
 368         /* We refer to the device */
 369         dev_hold(dev);
 370
 371         if (snmp6_alloc_dev(ndev) < 0) {
 372                 ADBG((KERN_WARNING
 373                         "%s: cannot allocate memory for statistics; dev=%s.\n",
 374                         __func__, dev->name));
 375                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 376                 dev_put(dev);
 377                 kfree(ndev);
 378                 return NULL;
 379         }
 380
 381         if (snmp6_register_dev(ndev) < 0) {
 382                 ADBG((KERN_WARNING
 383                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
 384                         __func__, dev->name));
 385                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
 386                 ndev->dead = 1;
 387                 in6_dev_finish_destroy(ndev);
 388                 return NULL;
 389         }
 390
 391         /* One reference from device.  We must do this before
 392          * we invoke __ipv6_regen_rndid().
 393          */
 394         in6_dev_hold(ndev);
 395
 396         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 397                 ndev->cnf.accept_dad = -1;
 398
 399 #if IS_ENABLED(CONFIG_IPV6_SIT)
 400         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 401                 pr_info("%s: Disabled Multicast RS\n", dev->name);
 402                 ndev->cnf.rtr_solicits = 0;
 403         }
 404 #endif
 405
 406 #ifdef CONFIG_IPV6_PRIVACY
 407         INIT_LIST_HEAD(&ndev->tempaddr_list);
 408         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 409         if ((dev->flags&IFF_LOOPBACK) ||
 410             dev->type == ARPHRD_TUNNEL ||
 411             dev->type == ARPHRD_TUNNEL6 ||
 412             dev->type == ARPHRD_SIT ||
 413             dev->type == ARPHRD_NONE) {
 414                 ndev->cnf.use_tempaddr = -1;
 415         } else {
 416                 in6_dev_hold(ndev);
 417                 ipv6_regen_rndid((unsigned long) ndev);
 418         }
 419 #endif
 420         ndev->token = in6addr_any;
 421
 422         if (netif_running(dev) && addrconf_qdisc_ok(dev))
 423                 ndev->if_flags |= IF_READY;
 424
 425         ipv6_mc_init_dev(ndev);
 426         ndev->tstamp = jiffies;
 427         addrconf_sysctl_register(ndev);
 428         /* protected by rtnl_lock */
 429         rcu_assign_pointer(dev->ip6_ptr, ndev);
 430
 431         /* Join interface-local all-node multicast group */
 432         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 433
 434         /* Join all-node multicast group */
 435         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 436
 437         /* Join all-router multicast group if forwarding is set */
 438         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 439                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 440
 441         return ndev;
 442 }
 443
 444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 445 {
 446         struct inet6_dev *idev;
 447
 448         ASSERT_RTNL();
 449
 450         idev = __in6_dev_get(dev);
 451         if (!idev) {
 452                 idev = ipv6_add_dev(dev);
 453                 if (!idev)
 454                         return NULL;
 455         }
 456
 457         if (dev->flags&IFF_UP)
 458                 ipv6_mc_up(idev);
 459         return idev;
 460 }
 461
 462 static int inet6_netconf_msgsize_devconf(int type)
 463 {
 464         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 465                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
 466
 467         /* type -1 is used for ALL */
 468         if (type == -1 || type == NETCONFA_FORWARDING)
 469                 size += nla_total_size(4);
 470 #ifdef CONFIG_IPV6_MROUTE
 471         if (type == -1 || type == NETCONFA_MC_FORWARDING)
 472                 size += nla_total_size(4);
 473 #endif
 474
 475         return size;
 476 }
 477
 478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 479                                       struct ipv6_devconf *devconf, u32 portid,
 480                                       u32 seq, int event, unsigned int flags,
 481                                       int type)
 482 {
 483         struct nlmsghdr  *nlh;
 484         struct netconfmsg *ncm;
 485
 486         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 487                         flags);
 488         if (nlh == NULL)
 489                 return -EMSGSIZE;
 490
 491         ncm = nlmsg_data(nlh);
 492         ncm->ncm_family = AF_INET6;
 493
 494         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 495                 goto nla_put_failure;
 496
 497         /* type -1 is used for ALL */
 498         if ((type == -1 || type == NETCONFA_FORWARDING) &&
 499             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 500                 goto nla_put_failure;
 501 #ifdef CONFIG_IPV6_MROUTE
 502         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 503             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 504                         devconf->mc_forwarding) < 0)
 505                 goto nla_put_failure;
 506 #endif
 507         return nlmsg_end(skb, nlh);
 508
 509 nla_put_failure:
 510         nlmsg_cancel(skb, nlh);
 511         return -EMSGSIZE;
 512 }
 513
 514 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 515                                   struct ipv6_devconf *devconf)
 516 {
 517         struct sk_buff *skb;
 518         int err = -ENOBUFS;
 519
 520         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 521         if (skb == NULL)
 522                 goto errout;
 523
 524         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 525                                          RTM_NEWNETCONF, 0, type);
 526         if (err < 0) {
 527                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 528                 WARN_ON(err == -EMSGSIZE);
 529                 kfree_skb(skb);
 530                 goto errout;
 531         }
 532         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 533         return;
 534 errout:
 535         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 536 }
 537
 538 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 539         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
 540         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
 541 };
 542
 543 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 544                                      struct nlmsghdr *nlh)
 545 {
 546         struct net *net = sock_net(in_skb->sk);
 547         struct nlattr *tb[NETCONFA_MAX+1];
 548         struct netconfmsg *ncm;
 549         struct sk_buff *skb;
 550         struct ipv6_devconf *devconf;
 551         struct inet6_dev *in6_dev;
 552         struct net_device *dev;
 553         int ifindex;
 554         int err;
 555
 556         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 557                           devconf_ipv6_policy);
 558         if (err < 0)
 559                 goto errout;
 560
 561         err = EINVAL;
 562         if (!tb[NETCONFA_IFINDEX])
 563                 goto errout;
 564
 565         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 566         switch (ifindex) {
 567         case NETCONFA_IFINDEX_ALL:
 568                 devconf = net->ipv6.devconf_all;
 569                 break;
 570         case NETCONFA_IFINDEX_DEFAULT:
 571                 devconf = net->ipv6.devconf_dflt;
 572                 break;
 573         default:
 574                 dev = __dev_get_by_index(net, ifindex);
 575                 if (dev == NULL)
 576                         goto errout;
 577                 in6_dev = __in6_dev_get(dev);
 578                 if (in6_dev == NULL)
 579                         goto errout;
 580                 devconf = &in6_dev->cnf;
 581                 break;
 582         }
 583
 584         err = -ENOBUFS;
 585         skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 586         if (skb == NULL)
 587                 goto errout;
 588
 589         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 590                                          NETLINK_CB(in_skb).portid,
 591                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 592                                          -1);
 593         if (err < 0) {
 594                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 595                 WARN_ON(err == -EMSGSIZE);
 596                 kfree_skb(skb);
 597                 goto errout;
 598         }
 599         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 600 errout:
 601         return err;
 602 }
 603
 604 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 605                                       struct netlink_callback *cb)
 606 {
 607         struct net *net = sock_net(skb->sk);
 608         int h, s_h;
 609         int idx, s_idx;
 610         struct net_device *dev;
 611         struct inet6_dev *idev;
 612         struct hlist_head *head;
 613
 614         s_h = cb->args[0];
 615         s_idx = idx = cb->args[1];
 616
 617         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 618                 idx = 0;
 619                 head = &net->dev_index_head[h];
 620                 rcu_read_lock();
 621                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 622                           net->dev_base_seq;
 623                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
 624                         if (idx < s_idx)
 625                                 goto cont;
 626                         idev = __in6_dev_get(dev);
 627                         if (!idev)
 628                                 goto cont;
 629
 630                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 631                                                        &idev->cnf,
 632                                                        NETLINK_CB(cb->skb).portid,
 633                                                        cb->nlh->nlmsg_seq,
 634                                                        RTM_NEWNETCONF,
 635                                                        NLM_F_MULTI,
 636                                                        -1) <= 0) {
 637                                 rcu_read_unlock();
 638                                 goto done;
 639                         }
 640                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 641 cont:
 642                         idx++;
 643                 }
 644                 rcu_read_unlock();
 645         }
 646         if (h == NETDEV_HASHENTRIES) {
 647                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 648                                                net->ipv6.devconf_all,
 649                                                NETLINK_CB(cb->skb).portid,
 650                                                cb->nlh->nlmsg_seq,
 651                                                RTM_NEWNETCONF, NLM_F_MULTI,
 652                                                -1) <= 0)
 653                         goto done;
 654                 else
 655                         h++;
 656         }
 657         if (h == NETDEV_HASHENTRIES + 1) {
 658                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 659                                                net->ipv6.devconf_dflt,
 660                                                NETLINK_CB(cb->skb).portid,
 661                                                cb->nlh->nlmsg_seq,
 662                                                RTM_NEWNETCONF, NLM_F_MULTI,
 663                                                -1) <= 0)
 664                         goto done;
 665                 else
 666                         h++;
 667         }
 668 done:
 669         cb->args[0] = h;
 670         cb->args[1] = idx;
 671
 672         return skb->len;
 673 }
 674
 675 #ifdef CONFIG_SYSCTL
 676 static void dev_forward_change(struct inet6_dev *idev)
 677 {
 678         struct net_device *dev;
 679         struct inet6_ifaddr *ifa;
 680
 681         if (!idev)
 682                 return;
 683         dev = idev->dev;
 684         if (idev->cnf.forwarding)
 685                 dev_disable_lro(dev);
 686         if (dev->flags & IFF_MULTICAST) {
 687                 if (idev->cnf.forwarding) {
 688                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 689                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 690                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 691                 } else {
 692                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 693                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 694                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 695                 }
 696         }
 697
 698         list_for_each_entry(ifa, &idev->addr_list, if_list) {
 699                 if (ifa->flags&IFA_F_TENTATIVE)
 700                         continue;
 701                 if (idev->cnf.forwarding)
 702                         addrconf_join_anycast(ifa);
 703                 else
 704                         addrconf_leave_anycast(ifa);
 705         }
 706         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 707                                      dev->ifindex, &idev->cnf);
 708 }
 709
 710
 711 static void addrconf_forward_change(struct net *net, __s32 newf)
 712 {
 713         struct net_device *dev;
 714         struct inet6_dev *idev;
 715
 716         for_each_netdev(net, dev) {
 717                 idev = __in6_dev_get(dev);
 718                 if (idev) {
 719                         int changed = (!idev->cnf.forwarding) ^ (!newf);
 720                         idev->cnf.forwarding = newf;
 721                         if (changed)
 722                                 dev_forward_change(idev);
 723                 }
 724         }
 725 }
 726
 727 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 728 {
 729         struct net *net;
 730         int old;
 731
 732         if (!rtnl_trylock())
 733                 return restart_syscall();
 734
 735         net = (struct net *)table->extra2;
 736         old = *p;
 737         *p = newf;
 738
 739         if (p == &net->ipv6.devconf_dflt->forwarding) {
 740                 if ((!newf) ^ (!old))
 741                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 742                                                      NETCONFA_IFINDEX_DEFAULT,
 743                                                      net->ipv6.devconf_dflt);
 744                 rtnl_unlock();
 745                 return 0;
 746         }
 747
 748         if (p == &net->ipv6.devconf_all->forwarding) {
 749                 net->ipv6.devconf_dflt->forwarding = newf;
 750                 addrconf_forward_change(net, newf);
 751                 if ((!newf) ^ (!old))
 752                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 753                                                      NETCONFA_IFINDEX_ALL,
 754                                                      net->ipv6.devconf_all);
 755         } else if ((!newf) ^ (!old))
 756                 dev_forward_change((struct inet6_dev *)table->extra1);
 757         rtnl_unlock();
 758
 759         if (newf)
 760                 rt6_purge_dflt_routers(net);
 761         return 1;
 762 }
 763 #endif
 764
 765 /* Nobody refers to this ifaddr, destroy it */
 766 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 767 {
 768         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 769
 770 #ifdef NET_REFCNT_DEBUG
 771         pr_debug("%s\n", __func__);
 772 #endif
 773
 774         in6_dev_put(ifp->idev);
 775
 776         if (del_timer(&ifp->dad_timer))
 777                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
 778
 779         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 780                 pr_warn("Freeing alive inet6 address %p\n", ifp);
 781                 return;
 782         }
 783         ip6_rt_put(ifp->rt);
 784
 785         kfree_rcu(ifp, rcu);
 786 }
 787
 788 static void
 789 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 790 {
 791         struct list_head *p;
 792         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 793
 794         /*
 795          * Each device address list is sorted in order of scope -
 796          * global before linklocal.
 797          */
 798         list_for_each(p, &idev->addr_list) {
 799                 struct inet6_ifaddr *ifa
 800                         = list_entry(p, struct inet6_ifaddr, if_list);
 801                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 802                         break;
 803         }
 804
 805         list_add_tail(&ifp->if_list, p);
 806 }
 807
 808 static u32 inet6_addr_hash(const struct in6_addr *addr)
 809 {
 810         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 811 }
 812
 813 /* On success it returns ifp with increased reference count */
 814
 815 static struct inet6_ifaddr *
 816 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 817               const struct in6_addr *peer_addr, int pfxlen,
 818               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 819 {
 820         struct inet6_ifaddr *ifa = NULL;
 821         struct rt6_info *rt;
 822         unsigned int hash;
 823         int err = 0;
 824         int addr_type = ipv6_addr_type(addr);
 825
 826         if (addr_type == IPV6_ADDR_ANY ||
 827             addr_type & IPV6_ADDR_MULTICAST ||
 828             (!(idev->dev->flags & IFF_LOOPBACK) &&
 829              addr_type & IPV6_ADDR_LOOPBACK))
 830                 return ERR_PTR(-EADDRNOTAVAIL);
 831
 832         rcu_read_lock_bh();
 833         if (idev->dead) {
 834                 err = -ENODEV;                  /*XXX*/
 835                 goto out2;
 836         }
 837
 838         if (idev->cnf.disable_ipv6) {
 839                 err = -EACCES;
 840                 goto out2;
 841         }
 842
 843         spin_lock(&addrconf_hash_lock);
 844
 845         /* Ignore adding duplicate addresses on an interface */
 846         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 847                 ADBG(("ipv6_add_addr: already assigned\n"));
 848                 err = -EEXIST;
 849                 goto out;
 850         }
 851
 852         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 853
 854         if (ifa == NULL) {
 855                 ADBG(("ipv6_add_addr: malloc failed\n"));
 856                 err = -ENOBUFS;
 857                 goto out;
 858         }
 859
 860         rt = addrconf_dst_alloc(idev, addr, false);
 861         if (IS_ERR(rt)) {
 862                 err = PTR_ERR(rt);
 863                 goto out;
 864         }
 865
 866         ifa->addr = *addr;
 867         if (peer_addr)
 868                 ifa->peer_addr = *peer_addr;
 869
 870         spin_lock_init(&ifa->lock);
 871         spin_lock_init(&ifa->state_lock);
 872         setup_timer(&ifa->dad_timer, addrconf_dad_timer,
 873                     (unsigned long)ifa);
 874         INIT_HLIST_NODE(&ifa->addr_lst);
 875         ifa->scope = scope;
 876         ifa->prefix_len = pfxlen;
 877         ifa->flags = flags | IFA_F_TENTATIVE;
 878         ifa->valid_lft = valid_lft;
 879         ifa->prefered_lft = prefered_lft;
 880         ifa->cstamp = ifa->tstamp = jiffies;
 881         ifa->tokenized = false;
 882
 883         ifa->rt = rt;
 884
 885         ifa->idev = idev;
 886         in6_dev_hold(idev);
 887         /* For caller */
 888         in6_ifa_hold(ifa);
 889
 890         /* Add to big hash table */
 891         hash = inet6_addr_hash(addr);
 892
 893         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 894         spin_unlock(&addrconf_hash_lock);
 895
 896         write_lock(&idev->lock);
 897         /* Add to inet6_dev unicast addr list. */
 898         ipv6_link_dev_addr(idev, ifa);
 899
 900 #ifdef CONFIG_IPV6_PRIVACY
 901         if (ifa->flags&IFA_F_TEMPORARY) {
 902                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
 903                 in6_ifa_hold(ifa);
 904         }
 905 #endif
 906
 907         in6_ifa_hold(ifa);
 908         write_unlock(&idev->lock);
 909 out2:
 910         rcu_read_unlock_bh();
 911
 912         if (likely(err == 0))
 913                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 914         else {
 915                 kfree(ifa);
 916                 ifa = ERR_PTR(err);
 917         }
 918
 919         return ifa;
 920 out:
 921         spin_unlock(&addrconf_hash_lock);
 922         goto out2;
 923 }
 924
 925 /* This function wants to get referenced ifp and releases it before return */
 926
 927 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 928 {
 929         struct inet6_ifaddr *ifa, *ifn;
 930         struct inet6_dev *idev = ifp->idev;
 931         int state;
 932         int deleted = 0, onlink = 0;
 933         unsigned long expires = jiffies;
 934
 935         spin_lock_bh(&ifp->state_lock);
 936         state = ifp->state;
 937         ifp->state = INET6_IFADDR_STATE_DEAD;
 938         spin_unlock_bh(&ifp->state_lock);
 939
 940         if (state == INET6_IFADDR_STATE_DEAD)
 941                 goto out;
 942
 943         spin_lock_bh(&addrconf_hash_lock);
 944         hlist_del_init_rcu(&ifp->addr_lst);
 945         spin_unlock_bh(&addrconf_hash_lock);
 946
 947         write_lock_bh(&idev->lock);
 948 #ifdef CONFIG_IPV6_PRIVACY
 949         if (ifp->flags&IFA_F_TEMPORARY) {
 950                 list_del(&ifp->tmp_list);
 951                 if (ifp->ifpub) {
 952                         in6_ifa_put(ifp->ifpub);
 953                         ifp->ifpub = NULL;
 954                 }
 955                 __in6_ifa_put(ifp);
 956         }
 957 #endif
 958
 959         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
 960                 if (ifa == ifp) {
 961                         list_del_init(&ifp->if_list);
 962                         __in6_ifa_put(ifp);
 963
 964                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
 965                                 break;
 966                         deleted = 1;
 967                         continue;
 968                 } else if (ifp->flags & IFA_F_PERMANENT) {
 969                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 970                                               ifp->prefix_len)) {
 971                                 if (ifa->flags & IFA_F_PERMANENT) {
 972                                         onlink = 1;
 973                                         if (deleted)
 974                                                 break;
 975                                 } else {
 976                                         unsigned long lifetime;
 977
 978                                         if (!onlink)
 979                                                 onlink = -1;
 980
 981                                         spin_lock(&ifa->lock);
 982
 983                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 984                                         /*
 985                                          * Note: Because this address is
 986                                          * not permanent, lifetime <
 987                                          * LONG_MAX / HZ here.
 988                                          */
 989                                         if (time_before(expires,
 990                                                         ifa->tstamp + lifetime * HZ))
 991                                                 expires = ifa->tstamp + lifetime * HZ;
 992                                         spin_unlock(&ifa->lock);
 993                                 }
 994                         }
 995                 }
 996         }
 997         write_unlock_bh(&idev->lock);
 998
 999         addrconf_del_dad_timer(ifp);
1000
1001         ipv6_ifa_notify(RTM_DELADDR, ifp);
1002
1003         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1004
1005         /*
1006          * Purge or update corresponding prefix
1007          *
1008          * 1) we don't purge prefix here if address was not permanent.
1009          *    prefix is managed by its own lifetime.
1010          * 2) if there're no addresses, delete prefix.
1011          * 3) if there're still other permanent address(es),
1012          *    corresponding prefix is still permanent.
1013          * 4) otherwise, update prefix lifetime to the
1014          *    longest valid lifetime among the corresponding
1015          *    addresses on the device.
1016          *    Note: subsequent RA will update lifetime.
1017          *
1018          * --yoshfuji
1019          */
1020         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1021                 struct in6_addr prefix;
1022                 struct rt6_info *rt;
1023
1024                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1025
1026                 rt = addrconf_get_prefix_route(&prefix,
1027                                                ifp->prefix_len,
1028                                                ifp->idev->dev,
1029                                                0, RTF_GATEWAY | RTF_DEFAULT);
1030
1031                 if (rt) {
1032                         if (onlink == 0) {
1033                                 ip6_del_rt(rt);
1034                                 rt = NULL;
1035                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1036                                 rt6_set_expires(rt, expires);
1037                         }
1038                 }
1039                 ip6_rt_put(rt);
1040         }
1041
1042         /* clean up prefsrc entries */
1043         rt6_remove_prefsrc(ifp);
1044 out:
1045         in6_ifa_put(ifp);
1046 }
1047
1048 #ifdef CONFIG_IPV6_PRIVACY
1049 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1050 {
1051         struct inet6_dev *idev = ifp->idev;
1052         struct in6_addr addr, *tmpaddr;
1053         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1054         unsigned long regen_advance;
1055         int tmp_plen;
1056         int ret = 0;
1057         int max_addresses;
1058         u32 addr_flags;
1059         unsigned long now = jiffies;
1060
1061         write_lock(&idev->lock);
1062         if (ift) {
1063                 spin_lock_bh(&ift->lock);
1064                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1065                 spin_unlock_bh(&ift->lock);
1066                 tmpaddr = &addr;
1067         } else {
1068                 tmpaddr = NULL;
1069         }
1070 retry:
1071         in6_dev_hold(idev);
1072         if (idev->cnf.use_tempaddr <= 0) {
1073                 write_unlock(&idev->lock);
1074                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1075                 in6_dev_put(idev);
1076                 ret = -1;
1077                 goto out;
1078         }
1079         spin_lock_bh(&ifp->lock);
1080         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1081                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1082                 spin_unlock_bh(&ifp->lock);
1083                 write_unlock(&idev->lock);
1084                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1085                         __func__);
1086                 in6_dev_put(idev);
1087                 ret = -1;
1088                 goto out;
1089         }
1090         in6_ifa_hold(ifp);
1091         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1092         __ipv6_try_regen_rndid(idev, tmpaddr);
1093         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1094         age = (now - ifp->tstamp) / HZ;
1095         tmp_valid_lft = min_t(__u32,
1096                               ifp->valid_lft,
1097                               idev->cnf.temp_valid_lft + age);
1098         tmp_prefered_lft = min_t(__u32,
1099                                  ifp->prefered_lft,
1100                                  idev->cnf.temp_prefered_lft + age -
1101                                  idev->cnf.max_desync_factor);
1102         tmp_plen = ifp->prefix_len;
1103         max_addresses = idev->cnf.max_addresses;
1104         tmp_tstamp = ifp->tstamp;
1105         spin_unlock_bh(&ifp->lock);
1106
1107         regen_advance = idev->cnf.regen_max_retry *
1108                         idev->cnf.dad_transmits *
1109                         idev->nd_parms->retrans_time / HZ;
1110         write_unlock(&idev->lock);
1111
1112         /* A temporary address is created only if this calculated Preferred
1113          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1114          * an implementation must not create a temporary address with a zero
1115          * Preferred Lifetime.
1116          */
1117         if (tmp_prefered_lft <= regen_advance) {
1118                 in6_ifa_put(ifp);
1119                 in6_dev_put(idev);
1120                 ret = -1;
1121                 goto out;
1122         }
1123
1124         addr_flags = IFA_F_TEMPORARY;
1125         /* set in addrconf_prefix_rcv() */
1126         if (ifp->flags & IFA_F_OPTIMISTIC)
1127                 addr_flags |= IFA_F_OPTIMISTIC;
1128
1129         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1130                             ipv6_addr_scope(&addr), addr_flags,
1131                             tmp_valid_lft, tmp_prefered_lft);
1132         if (IS_ERR(ift)) {
1133                 in6_ifa_put(ifp);
1134                 in6_dev_put(idev);
1135                 pr_info("%s: retry temporary address regeneration\n", __func__);
1136                 tmpaddr = &addr;
1137                 write_lock(&idev->lock);
1138                 goto retry;
1139         }
1140
1141         spin_lock_bh(&ift->lock);
1142         ift->ifpub = ifp;
1143         ift->cstamp = now;
1144         ift->tstamp = tmp_tstamp;
1145         spin_unlock_bh(&ift->lock);
1146
1147         addrconf_dad_start(ift);
1148         in6_ifa_put(ift);
1149         in6_dev_put(idev);
1150 out:
1151         return ret;
1152 }
1153 #endif
1154
1155 /*
1156  *      Choose an appropriate source address (RFC3484)
1157  */
1158 enum {
1159         IPV6_SADDR_RULE_INIT = 0,
1160         IPV6_SADDR_RULE_LOCAL,
1161         IPV6_SADDR_RULE_SCOPE,
1162         IPV6_SADDR_RULE_PREFERRED,
1163 #ifdef CONFIG_IPV6_MIP6
1164         IPV6_SADDR_RULE_HOA,
1165 #endif
1166         IPV6_SADDR_RULE_OIF,
1167         IPV6_SADDR_RULE_LABEL,
1168 #ifdef CONFIG_IPV6_PRIVACY
1169         IPV6_SADDR_RULE_PRIVACY,
1170 #endif
1171         IPV6_SADDR_RULE_ORCHID,
1172         IPV6_SADDR_RULE_PREFIX,
1173         IPV6_SADDR_RULE_MAX
1174 };
1175
1176 struct ipv6_saddr_score {
1177         int                     rule;
1178         int                     addr_type;
1179         struct inet6_ifaddr     *ifa;
1180         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1181         int                     scopedist;
1182         int                     matchlen;
1183 };
1184
1185 struct ipv6_saddr_dst {
1186         const struct in6_addr *addr;
1187         int ifindex;
1188         int scope;
1189         int label;
1190         unsigned int prefs;
1191 };
1192
1193 static inline int ipv6_saddr_preferred(int type)
1194 {
1195         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1196                 return 1;
1197         return 0;
1198 }
1199
1200 static int ipv6_get_saddr_eval(struct net *net,
1201                                struct ipv6_saddr_score *score,
1202                                struct ipv6_saddr_dst *dst,
1203                                int i)
1204 {
1205         int ret;
1206
1207         if (i <= score->rule) {
1208                 switch (i) {
1209                 case IPV6_SADDR_RULE_SCOPE:
1210                         ret = score->scopedist;
1211                         break;
1212                 case IPV6_SADDR_RULE_PREFIX:
1213                         ret = score->matchlen;
1214                         break;
1215                 default:
1216                         ret = !!test_bit(i, score->scorebits);
1217                 }
1218                 goto out;
1219         }
1220
1221         switch (i) {
1222         case IPV6_SADDR_RULE_INIT:
1223                 /* Rule 0: remember if hiscore is not ready yet */
1224                 ret = !!score->ifa;
1225                 break;
1226         case IPV6_SADDR_RULE_LOCAL:
1227                 /* Rule 1: Prefer same address */
1228                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1229                 break;
1230         case IPV6_SADDR_RULE_SCOPE:
1231                 /* Rule 2: Prefer appropriate scope
1232                  *
1233                  *      ret
1234                  *       ^
1235                  *    -1 |  d 15
1236                  *    ---+--+-+---> scope
1237                  *       |
1238                  *       |             d is scope of the destination.
1239                  *  B-d  |  \
1240                  *       |   \      <- smaller scope is better if
1241                  *  B-15 |    \        if scope is enough for destinaion.
1242                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1243                  * d-C-1 | /
1244                  *       |/         <- greater is better
1245                  *   -C  /             if scope is not enough for destination.
1246                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1247                  *
1248                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1249                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1250                  * Assume B = 0 and we get C > 29.
1251                  */
1252                 ret = __ipv6_addr_src_scope(score->addr_type);
1253                 if (ret >= dst->scope)
1254                         ret = -ret;
1255                 else
1256                         ret -= 128;     /* 30 is enough */
1257                 score->scopedist = ret;
1258                 break;
1259         case IPV6_SADDR_RULE_PREFERRED:
1260                 /* Rule 3: Avoid deprecated and optimistic addresses */
1261                 ret = ipv6_saddr_preferred(score->addr_type) ||
1262                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1263                 break;
1264 #ifdef CONFIG_IPV6_MIP6
1265         case IPV6_SADDR_RULE_HOA:
1266             {
1267                 /* Rule 4: Prefer home address */
1268                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1269                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1270                 break;
1271             }
1272 #endif
1273         case IPV6_SADDR_RULE_OIF:
1274                 /* Rule 5: Prefer outgoing interface */
1275                 ret = (!dst->ifindex ||
1276                        dst->ifindex == score->ifa->idev->dev->ifindex);
1277                 break;
1278         case IPV6_SADDR_RULE_LABEL:
1279                 /* Rule 6: Prefer matching label */
1280                 ret = ipv6_addr_label(net,
1281                                       &score->ifa->addr, score->addr_type,
1282                                       score->ifa->idev->dev->ifindex) == dst->label;
1283                 break;
1284 #ifdef CONFIG_IPV6_PRIVACY
1285         case IPV6_SADDR_RULE_PRIVACY:
1286             {
1287                 /* Rule 7: Prefer public address
1288                  * Note: prefer temporary address if use_tempaddr >= 2
1289                  */
1290                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1291                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1292                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1293                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1294                 break;
1295             }
1296 #endif
1297         case IPV6_SADDR_RULE_ORCHID:
1298                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1299                  *          non-ORCHID vs non-ORCHID
1300                  */
1301                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1302                         ipv6_addr_orchid(dst->addr));
1303                 break;
1304         case IPV6_SADDR_RULE_PREFIX:
1305                 /* Rule 8: Use longest matching prefix */
1306                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1307                 if (ret > score->ifa->prefix_len)
1308                         ret = score->ifa->prefix_len;
1309                 score->matchlen = ret;
1310                 break;
1311         default:
1312                 ret = 0;
1313         }
1314
1315         if (ret)
1316                 __set_bit(i, score->scorebits);
1317         score->rule = i;
1318 out:
1319         return ret;
1320 }
1321
1322 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1323                        const struct in6_addr *daddr, unsigned int prefs,
1324                        struct in6_addr *saddr)
1325 {
1326         struct ipv6_saddr_score scores[2],
1327                                 *score = &scores[0], *hiscore = &scores[1];
1328         struct ipv6_saddr_dst dst;
1329         struct net_device *dev;
1330         int dst_type;
1331
1332         dst_type = __ipv6_addr_type(daddr);
1333         dst.addr = daddr;
1334         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1335         dst.scope = __ipv6_addr_src_scope(dst_type);
1336         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1337         dst.prefs = prefs;
1338
1339         hiscore->rule = -1;
1340         hiscore->ifa = NULL;
1341
1342         rcu_read_lock();
1343
1344         for_each_netdev_rcu(net, dev) {
1345                 struct inet6_dev *idev;
1346
1347                 /* Candidate Source Address (section 4)
1348                  *  - multicast and link-local destination address,
1349                  *    the set of candidate source address MUST only
1350                  *    include addresses assigned to interfaces
1351                  *    belonging to the same link as the outgoing
1352                  *    interface.
1353                  * (- For site-local destination addresses, the
1354                  *    set of candidate source addresses MUST only
1355                  *    include addresses assigned to interfaces
1356                  *    belonging to the same site as the outgoing
1357                  *    interface.)
1358                  */
1359                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1360                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1361                     dst.ifindex && dev->ifindex != dst.ifindex)
1362                         continue;
1363
1364                 idev = __in6_dev_get(dev);
1365                 if (!idev)
1366                         continue;
1367
1368                 read_lock_bh(&idev->lock);
1369                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1370                         int i;
1371
1372                         /*
1373                          * - Tentative Address (RFC2462 section 5.4)
1374                          *  - A tentative address is not considered
1375                          *    "assigned to an interface" in the traditional
1376                          *    sense, unless it is also flagged as optimistic.
1377                          * - Candidate Source Address (section 4)
1378                          *  - In any case, anycast addresses, multicast
1379                          *    addresses, and the unspecified address MUST
1380                          *    NOT be included in a candidate set.
1381                          */
1382                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1383                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1384                                 continue;
1385
1386                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1387
1388                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1389                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1390                                 LIMIT_NETDEBUG(KERN_DEBUG
1391                                                "ADDRCONF: unspecified / multicast address "
1392                                                "assigned as unicast address on %s",
1393                                                dev->name);
1394                                 continue;
1395                         }
1396
1397                         score->rule = -1;
1398                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1399
1400                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1401                                 int minihiscore, miniscore;
1402
1403                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1404                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1405
1406                                 if (minihiscore > miniscore) {
1407                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1408                                             score->scopedist > 0) {
1409                                                 /*
1410                                                  * special case:
1411                                                  * each remaining entry
1412                                                  * has too small (not enough)
1413                                                  * scope, because ifa entries
1414                                                  * are sorted by their scope
1415                                                  * values.
1416                                                  */
1417                                                 goto try_nextdev;
1418                                         }
1419                                         break;
1420                                 } else if (minihiscore < miniscore) {
1421                                         if (hiscore->ifa)
1422                                                 in6_ifa_put(hiscore->ifa);
1423
1424                                         in6_ifa_hold(score->ifa);
1425
1426                                         swap(hiscore, score);
1427
1428                                         /* restore our iterator */
1429                                         score->ifa = hiscore->ifa;
1430
1431                                         break;
1432                                 }
1433                         }
1434                 }
1435 try_nextdev:
1436                 read_unlock_bh(&idev->lock);
1437         }
1438         rcu_read_unlock();
1439
1440         if (!hiscore->ifa)
1441                 return -EADDRNOTAVAIL;
1442
1443         *saddr = hiscore->ifa->addr;
1444         in6_ifa_put(hiscore->ifa);
1445         return 0;
1446 }
1447 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1448
1449 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1450                       unsigned char banned_flags)
1451 {
1452         struct inet6_ifaddr *ifp;
1453         int err = -EADDRNOTAVAIL;
1454
1455         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1456                 if (ifp->scope == IFA_LINK &&
1457                     !(ifp->flags & banned_flags)) {
1458                         *addr = ifp->addr;
1459                         err = 0;
1460                         break;
1461                 }
1462         }
1463         return err;
1464 }
1465
1466 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1467                     unsigned char banned_flags)
1468 {
1469         struct inet6_dev *idev;
1470         int err = -EADDRNOTAVAIL;
1471
1472         rcu_read_lock();
1473         idev = __in6_dev_get(dev);
1474         if (idev) {
1475                 read_lock_bh(&idev->lock);
1476                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1477                 read_unlock_bh(&idev->lock);
1478         }
1479         rcu_read_unlock();
1480         return err;
1481 }
1482
1483 static int ipv6_count_addresses(struct inet6_dev *idev)
1484 {
1485         int cnt = 0;
1486         struct inet6_ifaddr *ifp;
1487
1488         read_lock_bh(&idev->lock);
1489         list_for_each_entry(ifp, &idev->addr_list, if_list)
1490                 cnt++;
1491         read_unlock_bh(&idev->lock);
1492         return cnt;
1493 }
1494
1495 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1496                   const struct net_device *dev, int strict)
1497 {
1498         struct inet6_ifaddr *ifp;
1499         unsigned int hash = inet6_addr_hash(addr);
1500
1501         rcu_read_lock_bh();
1502         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1503                 if (!net_eq(dev_net(ifp->idev->dev), net))
1504                         continue;
1505                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1506                     !(ifp->flags&IFA_F_TENTATIVE) &&
1507                     (dev == NULL || ifp->idev->dev == dev ||
1508                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1509                         rcu_read_unlock_bh();
1510                         return 1;
1511                 }
1512         }
1513
1514         rcu_read_unlock_bh();
1515         return 0;
1516 }
1517 EXPORT_SYMBOL(ipv6_chk_addr);
1518
1519 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1520                                struct net_device *dev)
1521 {
1522         unsigned int hash = inet6_addr_hash(addr);
1523         struct inet6_ifaddr *ifp;
1524
1525         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1526                 if (!net_eq(dev_net(ifp->idev->dev), net))
1527                         continue;
1528                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1529                         if (dev == NULL || ifp->idev->dev == dev)
1530                                 return true;
1531                 }
1532         }
1533         return false;
1534 }
1535
1536 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1537 {
1538         struct inet6_dev *idev;
1539         struct inet6_ifaddr *ifa;
1540         int     onlink;
1541
1542         onlink = 0;
1543         rcu_read_lock();
1544         idev = __in6_dev_get(dev);
1545         if (idev) {
1546                 read_lock_bh(&idev->lock);
1547                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1548                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1549                                                    ifa->prefix_len);
1550                         if (onlink)
1551                                 break;
1552                 }
1553                 read_unlock_bh(&idev->lock);
1554         }
1555         rcu_read_unlock();
1556         return onlink;
1557 }
1558 EXPORT_SYMBOL(ipv6_chk_prefix);
1559
1560 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1561                                      struct net_device *dev, int strict)
1562 {
1563         struct inet6_ifaddr *ifp, *result = NULL;
1564         unsigned int hash = inet6_addr_hash(addr);
1565
1566         rcu_read_lock_bh();
1567         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1568                 if (!net_eq(dev_net(ifp->idev->dev), net))
1569                         continue;
1570                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1571                         if (dev == NULL || ifp->idev->dev == dev ||
1572                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1573                                 result = ifp;
1574                                 in6_ifa_hold(ifp);
1575                                 break;
1576                         }
1577                 }
1578         }
1579         rcu_read_unlock_bh();
1580
1581         return result;
1582 }
1583
1584 /* Gets referenced address, destroys ifaddr */
1585
1586 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1587 {
1588         if (ifp->flags&IFA_F_PERMANENT) {
1589                 spin_lock_bh(&ifp->lock);
1590                 addrconf_del_dad_timer(ifp);
1591                 ifp->flags |= IFA_F_TENTATIVE;
1592                 if (dad_failed)
1593                         ifp->flags |= IFA_F_DADFAILED;
1594                 spin_unlock_bh(&ifp->lock);
1595                 if (dad_failed)
1596                         ipv6_ifa_notify(0, ifp);
1597                 in6_ifa_put(ifp);
1598 #ifdef CONFIG_IPV6_PRIVACY
1599         } else if (ifp->flags&IFA_F_TEMPORARY) {
1600                 struct inet6_ifaddr *ifpub;
1601                 spin_lock_bh(&ifp->lock);
1602                 ifpub = ifp->ifpub;
1603                 if (ifpub) {
1604                         in6_ifa_hold(ifpub);
1605                         spin_unlock_bh(&ifp->lock);
1606                         ipv6_create_tempaddr(ifpub, ifp);
1607                         in6_ifa_put(ifpub);
1608                 } else {
1609                         spin_unlock_bh(&ifp->lock);
1610                 }
1611                 ipv6_del_addr(ifp);
1612 #endif
1613         } else
1614                 ipv6_del_addr(ifp);
1615 }
1616
1617 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1618 {
1619         int err = -ENOENT;
1620
1621         spin_lock(&ifp->state_lock);
1622         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1623                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1624                 err = 0;
1625         }
1626         spin_unlock(&ifp->state_lock);
1627
1628         return err;
1629 }
1630
1631 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1632 {
1633         struct inet6_dev *idev = ifp->idev;
1634
1635         if (addrconf_dad_end(ifp)) {
1636                 in6_ifa_put(ifp);
1637                 return;
1638         }
1639
1640         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1641                              ifp->idev->dev->name, &ifp->addr);
1642
1643         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1644                 struct in6_addr addr;
1645
1646                 addr.s6_addr32[0] = htonl(0xfe800000);
1647                 addr.s6_addr32[1] = 0;
1648
1649                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1650                     ipv6_addr_equal(&ifp->addr, &addr)) {
1651                         /* DAD failed for link-local based on MAC address */
1652                         idev->cnf.disable_ipv6 = 1;
1653
1654                         pr_info("%s: IPv6 being disabled!\n",
1655                                 ifp->idev->dev->name);
1656                 }
1657         }
1658
1659         addrconf_dad_stop(ifp, 1);
1660 }
1661
1662 /* Join to solicited addr multicast group. */
1663
1664 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1665 {
1666         struct in6_addr maddr;
1667
1668         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1669                 return;
1670
1671         addrconf_addr_solict_mult(addr, &maddr);
1672         ipv6_dev_mc_inc(dev, &maddr);
1673 }
1674
1675 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1676 {
1677         struct in6_addr maddr;
1678
1679         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1680                 return;
1681
1682         addrconf_addr_solict_mult(addr, &maddr);
1683         __ipv6_dev_mc_dec(idev, &maddr);
1684 }
1685
1686 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1687 {
1688         struct in6_addr addr;
1689         if (ifp->prefix_len == 127) /* RFC 6164 */
1690                 return;
1691         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1692         if (ipv6_addr_any(&addr))
1693                 return;
1694         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1695 }
1696
1697 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1698 {
1699         struct in6_addr addr;
1700         if (ifp->prefix_len == 127) /* RFC 6164 */
1701                 return;
1702         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1703         if (ipv6_addr_any(&addr))
1704                 return;
1705         __ipv6_dev_ac_dec(ifp->idev, &addr);
1706 }
1707
1708 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1709 {
1710         if (dev->addr_len != ETH_ALEN)
1711                 return -1;
1712         memcpy(eui, dev->dev_addr, 3);
1713         memcpy(eui + 5, dev->dev_addr + 3, 3);
1714
1715         /*
1716          * The zSeries OSA network cards can be shared among various
1717          * OS instances, but the OSA cards have only one MAC address.
1718          * This leads to duplicate address conflicts in conjunction
1719          * with IPv6 if more than one instance uses the same card.
1720          *
1721          * The driver for these cards can deliver a unique 16-bit
1722          * identifier for each instance sharing the same card.  It is
1723          * placed instead of 0xFFFE in the interface identifier.  The
1724          * "u" bit of the interface identifier is not inverted in this
1725          * case.  Hence the resulting interface identifier has local
1726          * scope according to RFC2373.
1727          */
1728         if (dev->dev_id) {
1729                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1730                 eui[4] = dev->dev_id & 0xFF;
1731         } else {
1732                 eui[3] = 0xFF;
1733                 eui[4] = 0xFE;
1734                 eui[0] ^= 2;
1735         }
1736         return 0;
1737 }
1738
1739 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1740 {
1741         if (dev->addr_len != IEEE802154_ADDR_LEN)
1742                 return -1;
1743         memcpy(eui, dev->dev_addr, 8);
1744         eui[0] ^= 2;
1745         return 0;
1746 }
1747
1748 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1749 {
1750         union fwnet_hwaddr *ha;
1751
1752         if (dev->addr_len != FWNET_ALEN)
1753                 return -1;
1754
1755         ha = (union fwnet_hwaddr *)dev->dev_addr;
1756
1757         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1758         eui[0] ^= 2;
1759         return 0;
1760 }
1761
1762 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1763 {
1764         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1765         if (dev->addr_len != ARCNET_ALEN)
1766                 return -1;
1767         memset(eui, 0, 7);
1768         eui[7] = *(u8 *)dev->dev_addr;
1769         return 0;
1770 }
1771
1772 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1773 {
1774         if (dev->addr_len != INFINIBAND_ALEN)
1775                 return -1;
1776         memcpy(eui, dev->dev_addr + 12, 8);
1777         eui[0] |= 2;
1778         return 0;
1779 }
1780
1781 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1782 {
1783         if (addr == 0)
1784                 return -1;
1785         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1786                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1787                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1788                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1789                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1790                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1791         eui[1] = 0;
1792         eui[2] = 0x5E;
1793         eui[3] = 0xFE;
1794         memcpy(eui + 4, &addr, 4);
1795         return 0;
1796 }
1797
1798 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1799 {
1800         if (dev->priv_flags & IFF_ISATAP)
1801                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1802         return -1;
1803 }
1804
1805 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1806 {
1807         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1808 }
1809
1810 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1811 {
1812         switch (dev->type) {
1813         case ARPHRD_ETHER:
1814         case ARPHRD_FDDI:
1815                 return addrconf_ifid_eui48(eui, dev);
1816         case ARPHRD_ARCNET:
1817                 return addrconf_ifid_arcnet(eui, dev);
1818         case ARPHRD_INFINIBAND:
1819                 return addrconf_ifid_infiniband(eui, dev);
1820         case ARPHRD_SIT:
1821                 return addrconf_ifid_sit(eui, dev);
1822         case ARPHRD_IPGRE:
1823                 return addrconf_ifid_gre(eui, dev);
1824         case ARPHRD_IEEE802154:
1825                 return addrconf_ifid_eui64(eui, dev);
1826         case ARPHRD_IEEE1394:
1827                 return addrconf_ifid_ieee1394(eui, dev);
1828         }
1829         return -1;
1830 }
1831
1832 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1833 {
1834         int err = -1;
1835         struct inet6_ifaddr *ifp;
1836
1837         read_lock_bh(&idev->lock);
1838         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1839                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1840                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1841                         err = 0;
1842                         break;
1843                 }
1844         }
1845         read_unlock_bh(&idev->lock);
1846         return err;
1847 }
1848
1849 #ifdef CONFIG_IPV6_PRIVACY
1850 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1851 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1852 {
1853 regen:
1854         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1855         idev->rndid[0] &= ~0x02;
1856
1857         /*
1858          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1859          * check if generated address is not inappropriate
1860          *
1861          *  - Reserved subnet anycast (RFC 2526)
1862          *      11111101 11....11 1xxxxxxx
1863          *  - ISATAP (RFC4214) 6.1
1864          *      00-00-5E-FE-xx-xx-xx-xx
1865          *  - value 0
1866          *  - XXX: already assigned to an address on the device
1867          */
1868         if (idev->rndid[0] == 0xfd &&
1869             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1870             (idev->rndid[7]&0x80))
1871                 goto regen;
1872         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1873                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1874                         goto regen;
1875                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1876                         goto regen;
1877         }
1878 }
1879
1880 static void ipv6_regen_rndid(unsigned long data)
1881 {
1882         struct inet6_dev *idev = (struct inet6_dev *) data;
1883         unsigned long expires;
1884
1885         rcu_read_lock_bh();
1886         write_lock_bh(&idev->lock);
1887
1888         if (idev->dead)
1889                 goto out;
1890
1891         __ipv6_regen_rndid(idev);
1892
1893         expires = jiffies +
1894                 idev->cnf.temp_prefered_lft * HZ -
1895                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1896                 idev->cnf.max_desync_factor * HZ;
1897         if (time_before(expires, jiffies)) {
1898                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1899                         __func__, idev->dev->name);
1900                 goto out;
1901         }
1902
1903         if (!mod_timer(&idev->regen_timer, expires))
1904                 in6_dev_hold(idev);
1905
1906 out:
1907         write_unlock_bh(&idev->lock);
1908         rcu_read_unlock_bh();
1909         in6_dev_put(idev);
1910 }
1911
1912 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1913 {
1914         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1915                 __ipv6_regen_rndid(idev);
1916 }
1917 #endif
1918
1919 /*
1920  *      Add prefix route.
1921  */
1922
1923 static void
1924 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1925                       unsigned long expires, u32 flags)
1926 {
1927         struct fib6_config cfg = {
1928                 .fc_table = RT6_TABLE_PREFIX,
1929                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1930                 .fc_ifindex = dev->ifindex,
1931                 .fc_expires = expires,
1932                 .fc_dst_len = plen,
1933                 .fc_flags = RTF_UP | flags,
1934                 .fc_nlinfo.nl_net = dev_net(dev),
1935                 .fc_protocol = RTPROT_KERNEL,
1936         };
1937
1938         cfg.fc_dst = *pfx;
1939
1940         /* Prevent useless cloning on PtP SIT.
1941            This thing is done here expecting that the whole
1942            class of non-broadcast devices need not cloning.
1943          */
1944 #if IS_ENABLED(CONFIG_IPV6_SIT)
1945         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1946                 cfg.fc_flags |= RTF_NONEXTHOP;
1947 #endif
1948
1949         ip6_route_add(&cfg);
1950 }
1951
1952
1953 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1954                                                   int plen,
1955                                                   const struct net_device *dev,
1956                                                   u32 flags, u32 noflags)
1957 {
1958         struct fib6_node *fn;
1959         struct rt6_info *rt = NULL;
1960         struct fib6_table *table;
1961
1962         table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1963         if (table == NULL)
1964                 return NULL;
1965
1966         read_lock_bh(&table->tb6_lock);
1967         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1968         if (!fn)
1969                 goto out;
1970         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1971                 if (rt->dst.dev->ifindex != dev->ifindex)
1972                         continue;
1973                 if ((rt->rt6i_flags & flags) != flags)
1974                         continue;
1975                 if ((rt->rt6i_flags & noflags) != 0)
1976                         continue;
1977                 dst_hold(&rt->dst);
1978                 break;
1979         }
1980 out:
1981         read_unlock_bh(&table->tb6_lock);
1982         return rt;
1983 }
1984
1985
1986 /* Create "default" multicast route to the interface */
1987
1988 static void addrconf_add_mroute(struct net_device *dev)
1989 {
1990         struct fib6_config cfg = {
1991                 .fc_table = RT6_TABLE_LOCAL,
1992                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1993                 .fc_ifindex = dev->ifindex,
1994                 .fc_dst_len = 8,
1995                 .fc_flags = RTF_UP,
1996                 .fc_nlinfo.nl_net = dev_net(dev),
1997         };
1998
1999         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2000
2001         ip6_route_add(&cfg);
2002 }
2003
2004 #if IS_ENABLED(CONFIG_IPV6_SIT)
2005 static void sit_route_add(struct net_device *dev)
2006 {
2007         struct fib6_config cfg = {
2008                 .fc_table = RT6_TABLE_MAIN,
2009                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2010                 .fc_ifindex = dev->ifindex,
2011                 .fc_dst_len = 96,
2012                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2013                 .fc_nlinfo.nl_net = dev_net(dev),
2014         };
2015
2016         /* prefix length - 96 bits "::d.d.d.d" */
2017         ip6_route_add(&cfg);
2018 }
2019 #endif
2020
2021 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2022 {
2023         struct inet6_dev *idev;
2024
2025         ASSERT_RTNL();
2026
2027         idev = ipv6_find_idev(dev);
2028         if (!idev)
2029                 return ERR_PTR(-ENOBUFS);
2030
2031         if (idev->cnf.disable_ipv6)
2032                 return ERR_PTR(-EACCES);
2033
2034         /* Add default multicast route */
2035         if (!(dev->flags & IFF_LOOPBACK))
2036                 addrconf_add_mroute(dev);
2037
2038         return idev;
2039 }
2040
2041 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2042 {
2043         struct prefix_info *pinfo;
2044         __u32 valid_lft;
2045         __u32 prefered_lft;
2046         int addr_type;
2047         struct inet6_dev *in6_dev;
2048         struct net *net = dev_net(dev);
2049
2050         pinfo = (struct prefix_info *) opt;
2051
2052         if (len < sizeof(struct prefix_info)) {
2053                 ADBG(("addrconf: prefix option too short\n"));
2054                 return;
2055         }
2056
2057         /*
2058          *      Validation checks ([ADDRCONF], page 19)
2059          */
2060
2061         addr_type = ipv6_addr_type(&pinfo->prefix);
2062
2063         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2064                 return;
2065
2066         valid_lft = ntohl(pinfo->valid);
2067         prefered_lft = ntohl(pinfo->prefered);
2068
2069         if (prefered_lft > valid_lft) {
2070                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2071                 return;
2072         }
2073
2074         in6_dev = in6_dev_get(dev);
2075
2076         if (in6_dev == NULL) {
2077                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2078                                     dev->name);
2079                 return;
2080         }
2081
2082         /*
2083          *      Two things going on here:
2084          *      1) Add routes for on-link prefixes
2085          *      2) Configure prefixes with the auto flag set
2086          */
2087
2088         if (pinfo->onlink) {
2089                 struct rt6_info *rt;
2090                 unsigned long rt_expires;
2091
2092                 /* Avoid arithmetic overflow. Really, we could
2093                  * save rt_expires in seconds, likely valid_lft,
2094                  * but it would require division in fib gc, that it
2095                  * not good.
2096                  */
2097                 if (HZ > USER_HZ)
2098                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2099                 else
2100                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2101
2102                 if (addrconf_finite_timeout(rt_expires))
2103                         rt_expires *= HZ;
2104
2105                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2106                                                pinfo->prefix_len,
2107                                                dev,
2108                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2109                                                RTF_GATEWAY | RTF_DEFAULT);
2110
2111                 if (rt) {
2112                         /* Autoconf prefix route */
2113                         if (valid_lft == 0) {
2114                                 ip6_del_rt(rt);
2115                                 rt = NULL;
2116                         } else if (addrconf_finite_timeout(rt_expires)) {
2117                                 /* not infinity */
2118                                 rt6_set_expires(rt, jiffies + rt_expires);
2119                         } else {
2120                                 rt6_clean_expires(rt);
2121                         }
2122                 } else if (valid_lft) {
2123                         clock_t expires = 0;
2124                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2125                         if (addrconf_finite_timeout(rt_expires)) {
2126                                 /* not infinity */
2127                                 flags |= RTF_EXPIRES;
2128                                 expires = jiffies_to_clock_t(rt_expires);
2129                         }
2130                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2131                                               dev, expires, flags);
2132                 }
2133                 ip6_rt_put(rt);
2134         }
2135
2136         /* Try to figure out our local address for this prefix */
2137
2138         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2139                 struct inet6_ifaddr *ifp;
2140                 struct in6_addr addr;
2141                 int create = 0, update_lft = 0;
2142                 bool tokenized = false;
2143
2144                 if (pinfo->prefix_len == 64) {
2145                         memcpy(&addr, &pinfo->prefix, 8);
2146
2147                         if (!ipv6_addr_any(&in6_dev->token)) {
2148                                 read_lock_bh(&in6_dev->lock);
2149                                 memcpy(addr.s6_addr + 8,
2150                                        in6_dev->token.s6_addr + 8, 8);
2151                                 read_unlock_bh(&in6_dev->lock);
2152                                 tokenized = true;
2153                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2154                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2155                                 in6_dev_put(in6_dev);
2156                                 return;
2157                         }
2158                         goto ok;
2159                 }
2160                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2161                                     pinfo->prefix_len);
2162                 in6_dev_put(in6_dev);
2163                 return;
2164
2165 ok:
2166
2167                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2168
2169                 if (ifp == NULL && valid_lft) {
2170                         int max_addresses = in6_dev->cnf.max_addresses;
2171                         u32 addr_flags = 0;
2172
2173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2174                         if (in6_dev->cnf.optimistic_dad &&
2175                             !net->ipv6.devconf_all->forwarding && sllao)
2176                                 addr_flags = IFA_F_OPTIMISTIC;
2177 #endif
2178
2179                         /* Do not allow to create too much of autoconfigured
2180                          * addresses; this would be too easy way to crash kernel.
2181                          */
2182                         if (!max_addresses ||
2183                             ipv6_count_addresses(in6_dev) < max_addresses)
2184                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2185                                                     pinfo->prefix_len,
2186                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2187                                                     addr_flags, valid_lft,
2188                                                     prefered_lft);
2189
2190                         if (IS_ERR_OR_NULL(ifp)) {
2191                                 in6_dev_put(in6_dev);
2192                                 return;
2193                         }
2194
2195                         update_lft = 0;
2196                         create = 1;
2197                         ifp->cstamp = jiffies;
2198                         ifp->tokenized = tokenized;
2199                         addrconf_dad_start(ifp);
2200                 }
2201
2202                 if (ifp) {
2203                         int flags;
2204                         unsigned long now;
2205 #ifdef CONFIG_IPV6_PRIVACY
2206                         struct inet6_ifaddr *ift;
2207 #endif
2208                         u32 stored_lft;
2209
2210                         /* update lifetime (RFC2462 5.5.3 e) */
2211                         spin_lock(&ifp->lock);
2212                         now = jiffies;
2213                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2214                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2215                         else
2216                                 stored_lft = 0;
2217                         if (!update_lft && !create && stored_lft) {
2218                                 if (valid_lft > MIN_VALID_LIFETIME ||
2219                                     valid_lft > stored_lft)
2220                                         update_lft = 1;
2221                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
2222                                         /* valid_lft <= stored_lft is always true */
2223                                         /*
2224                                          * RFC 4862 Section 5.5.3e:
2225                                          * "Note that the preferred lifetime of
2226                                          *  the corresponding address is always
2227                                          *  reset to the Preferred Lifetime in
2228                                          *  the received Prefix Information
2229                                          *  option, regardless of whether the
2230                                          *  valid lifetime is also reset or
2231                                          *  ignored."
2232                                          *
2233                                          *  So if the preferred lifetime in
2234                                          *  this advertisement is different
2235                                          *  than what we have stored, but the
2236                                          *  valid lifetime is invalid, just
2237                                          *  reset prefered_lft.
2238                                          *
2239                                          *  We must set the valid lifetime
2240                                          *  to the stored lifetime since we'll
2241                                          *  be updating the timestamp below,
2242                                          *  else we'll set it back to the
2243                                          *  minimum.
2244                                          */
2245                                         if (prefered_lft != ifp->prefered_lft) {
2246                                                 valid_lft = stored_lft;
2247                                                 update_lft = 1;
2248                                         }
2249                                 } else {
2250                                         valid_lft = MIN_VALID_LIFETIME;
2251                                         if (valid_lft < prefered_lft)
2252                                                 prefered_lft = valid_lft;
2253                                         update_lft = 1;
2254                                 }
2255                         }
2256
2257                         if (update_lft) {
2258                                 ifp->valid_lft = valid_lft;
2259                                 ifp->prefered_lft = prefered_lft;
2260                                 ifp->tstamp = now;
2261                                 flags = ifp->flags;
2262                                 ifp->flags &= ~IFA_F_DEPRECATED;
2263                                 spin_unlock(&ifp->lock);
2264
2265                                 if (!(flags&IFA_F_TENTATIVE))
2266                                         ipv6_ifa_notify(0, ifp);
2267                         } else
2268                                 spin_unlock(&ifp->lock);
2269
2270 #ifdef CONFIG_IPV6_PRIVACY
2271                         read_lock_bh(&in6_dev->lock);
2272                         /* update all temporary addresses in the list */
2273                         list_for_each_entry(ift, &in6_dev->tempaddr_list,
2274                                             tmp_list) {
2275                                 int age, max_valid, max_prefered;
2276
2277                                 if (ifp != ift->ifpub)
2278                                         continue;
2279
2280                                 /*
2281                                  * RFC 4941 section 3.3:
2282                                  * If a received option will extend the lifetime
2283                                  * of a public address, the lifetimes of
2284                                  * temporary addresses should be extended,
2285                                  * subject to the overall constraint that no
2286                                  * temporary addresses should ever remain
2287                                  * "valid" or "preferred" for a time longer than
2288                                  * (TEMP_VALID_LIFETIME) or
2289                                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2290                                  * respectively.
2291                                  */
2292                                 age = (now - ift->cstamp) / HZ;
2293                                 max_valid = in6_dev->cnf.temp_valid_lft - age;
2294                                 if (max_valid < 0)
2295                                         max_valid = 0;
2296
2297                                 max_prefered = in6_dev->cnf.temp_prefered_lft -
2298                                                in6_dev->cnf.max_desync_factor -
2299                                                age;
2300                                 if (max_prefered < 0)
2301                                         max_prefered = 0;
2302
2303                                 if (valid_lft > max_valid)
2304                                         valid_lft = max_valid;
2305
2306                                 if (prefered_lft > max_prefered)
2307                                         prefered_lft = max_prefered;
2308
2309                                 spin_lock(&ift->lock);
2310                                 flags = ift->flags;
2311                                 ift->valid_lft = valid_lft;
2312                                 ift->prefered_lft = prefered_lft;
2313                                 ift->tstamp = now;
2314                                 if (prefered_lft > 0)
2315                                         ift->flags &= ~IFA_F_DEPRECATED;
2316
2317                                 spin_unlock(&ift->lock);
2318                                 if (!(flags&IFA_F_TENTATIVE))
2319                                         ipv6_ifa_notify(0, ift);
2320                         }
2321
2322                         if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2323                                 /*
2324                                  * When a new public address is created as
2325                                  * described in [ADDRCONF], also create a new
2326                                  * temporary address. Also create a temporary
2327                                  * address if it's enabled but no temporary
2328                                  * address currently exists.
2329                                  */
2330                                 read_unlock_bh(&in6_dev->lock);
2331                                 ipv6_create_tempaddr(ifp, NULL);
2332                         } else {
2333                                 read_unlock_bh(&in6_dev->lock);
2334                         }
2335 #endif
2336                         in6_ifa_put(ifp);
2337                         addrconf_verify(0);
2338                 }
2339         }
2340         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2341         in6_dev_put(in6_dev);
2342 }
2343
2344 /*
2345  *      Set destination address.
2346  *      Special case for SIT interfaces where we create a new "virtual"
2347  *      device.
2348  */
2349 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2350 {
2351         struct in6_ifreq ireq;
2352         struct net_device *dev;
2353         int err = -EINVAL;
2354
2355         rtnl_lock();
2356
2357         err = -EFAULT;
2358         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2359                 goto err_exit;
2360
2361         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2362
2363         err = -ENODEV;
2364         if (dev == NULL)
2365                 goto err_exit;
2366
2367 #if IS_ENABLED(CONFIG_IPV6_SIT)
2368         if (dev->type == ARPHRD_SIT) {
2369                 const struct net_device_ops *ops = dev->netdev_ops;
2370                 struct ifreq ifr;
2371                 struct ip_tunnel_parm p;
2372
2373                 err = -EADDRNOTAVAIL;
2374                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2375                         goto err_exit;
2376
2377                 memset(&p, 0, sizeof(p));
2378                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2379                 p.iph.saddr = 0;
2380                 p.iph.version = 4;
2381                 p.iph.ihl = 5;
2382                 p.iph.protocol = IPPROTO_IPV6;
2383                 p.iph.ttl = 64;
2384                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2385
2386                 if (ops->ndo_do_ioctl) {
2387                         mm_segment_t oldfs = get_fs();
2388
2389                         set_fs(KERNEL_DS);
2390                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2391                         set_fs(oldfs);
2392                 } else
2393                         err = -EOPNOTSUPP;
2394
2395                 if (err == 0) {
2396                         err = -ENOBUFS;
2397                         dev = __dev_get_by_name(net, p.name);
2398                         if (!dev)
2399                                 goto err_exit;
2400                         err = dev_open(dev);
2401                 }
2402         }
2403 #endif
2404
2405 err_exit:
2406         rtnl_unlock();
2407         return err;
2408 }
2409
2410 /*
2411  *      Manual configuration of address on an interface
2412  */
2413 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2414                           const struct in6_addr *peer_pfx,
2415                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2416                           __u32 valid_lft)
2417 {
2418         struct inet6_ifaddr *ifp;
2419         struct inet6_dev *idev;
2420         struct net_device *dev;
2421         int scope;
2422         u32 flags;
2423         clock_t expires;
2424         unsigned long timeout;
2425
2426         ASSERT_RTNL();
2427
2428         if (plen > 128)
2429                 return -EINVAL;
2430
2431         /* check the lifetime */
2432         if (!valid_lft || prefered_lft > valid_lft)
2433                 return -EINVAL;
2434
2435         dev = __dev_get_by_index(net, ifindex);
2436         if (!dev)
2437                 return -ENODEV;
2438
2439         idev = addrconf_add_dev(dev);
2440         if (IS_ERR(idev))
2441                 return PTR_ERR(idev);
2442
2443         scope = ipv6_addr_scope(pfx);
2444
2445         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2446         if (addrconf_finite_timeout(timeout)) {
2447                 expires = jiffies_to_clock_t(timeout * HZ);
2448                 valid_lft = timeout;
2449                 flags = RTF_EXPIRES;
2450         } else {
2451                 expires = 0;
2452                 flags = 0;
2453                 ifa_flags |= IFA_F_PERMANENT;
2454         }
2455
2456         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2457         if (addrconf_finite_timeout(timeout)) {
2458                 if (timeout == 0)
2459                         ifa_flags |= IFA_F_DEPRECATED;
2460                 prefered_lft = timeout;
2461         }
2462
2463         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2464                             valid_lft, prefered_lft);
2465
2466         if (!IS_ERR(ifp)) {
2467                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2468                                       expires, flags);
2469                 /*
2470                  * Note that section 3.1 of RFC 4429 indicates
2471                  * that the Optimistic flag should not be set for
2472                  * manually configured addresses
2473                  */
2474                 addrconf_dad_start(ifp);
2475                 in6_ifa_put(ifp);
2476                 addrconf_verify(0);
2477                 return 0;
2478         }
2479
2480         return PTR_ERR(ifp);
2481 }
2482
2483 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2484                           unsigned int plen)
2485 {
2486         struct inet6_ifaddr *ifp;
2487         struct inet6_dev *idev;
2488         struct net_device *dev;
2489
2490         if (plen > 128)
2491                 return -EINVAL;
2492
2493         dev = __dev_get_by_index(net, ifindex);
2494         if (!dev)
2495                 return -ENODEV;
2496
2497         if ((idev = __in6_dev_get(dev)) == NULL)
2498                 return -ENXIO;
2499
2500         read_lock_bh(&idev->lock);
2501         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2502                 if (ifp->prefix_len == plen &&
2503                     ipv6_addr_equal(pfx, &ifp->addr)) {
2504                         in6_ifa_hold(ifp);
2505                         read_unlock_bh(&idev->lock);
2506
2507                         ipv6_del_addr(ifp);
2508                         return 0;
2509                 }
2510         }
2511         read_unlock_bh(&idev->lock);
2512         return -EADDRNOTAVAIL;
2513 }
2514
2515
2516 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2517 {
2518         struct in6_ifreq ireq;
2519         int err;
2520
2521         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2522                 return -EPERM;
2523
2524         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2525                 return -EFAULT;
2526
2527         rtnl_lock();
2528         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2529                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2530                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2531         rtnl_unlock();
2532         return err;
2533 }
2534
2535 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2536 {
2537         struct in6_ifreq ireq;
2538         int err;
2539
2540         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2541                 return -EPERM;
2542
2543         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2544                 return -EFAULT;
2545
2546         rtnl_lock();
2547         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2548                              ireq.ifr6_prefixlen);
2549         rtnl_unlock();
2550         return err;
2551 }
2552
2553 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2554                      int plen, int scope)
2555 {
2556         struct inet6_ifaddr *ifp;
2557
2558         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2559                             scope, IFA_F_PERMANENT, 0, 0);
2560         if (!IS_ERR(ifp)) {
2561                 spin_lock_bh(&ifp->lock);
2562                 ifp->flags &= ~IFA_F_TENTATIVE;
2563                 spin_unlock_bh(&ifp->lock);
2564                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2565                 in6_ifa_put(ifp);
2566         }
2567 }
2568
2569 #if IS_ENABLED(CONFIG_IPV6_SIT)
2570 static void sit_add_v4_addrs(struct inet6_dev *idev)
2571 {
2572         struct in6_addr addr;
2573         struct net_device *dev;
2574         struct net *net = dev_net(idev->dev);
2575         int scope;
2576
2577         ASSERT_RTNL();
2578
2579         memset(&addr, 0, sizeof(struct in6_addr));
2580         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2581
2582         if (idev->dev->flags&IFF_POINTOPOINT) {
2583                 addr.s6_addr32[0] = htonl(0xfe800000);
2584                 scope = IFA_LINK;
2585         } else {
2586                 scope = IPV6_ADDR_COMPATv4;
2587         }
2588
2589         if (addr.s6_addr32[3]) {
2590                 add_addr(idev, &addr, 128, scope);
2591                 return;
2592         }
2593
2594         for_each_netdev(net, dev) {
2595                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2596                 if (in_dev && (dev->flags & IFF_UP)) {
2597                         struct in_ifaddr *ifa;
2598
2599                         int flag = scope;
2600
2601                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2602                                 int plen;
2603
2604                                 addr.s6_addr32[3] = ifa->ifa_local;
2605
2606                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2607                                         continue;
2608                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2609                                         if (idev->dev->flags&IFF_POINTOPOINT)
2610                                                 continue;
2611                                         flag |= IFA_HOST;
2612                                 }
2613                                 if (idev->dev->flags&IFF_POINTOPOINT)
2614                                         plen = 64;
2615                                 else
2616                                         plen = 96;
2617
2618                                 add_addr(idev, &addr, plen, flag);
2619                         }
2620                 }
2621         }
2622 }
2623 #endif
2624
2625 static void init_loopback(struct net_device *dev)
2626 {
2627         struct inet6_dev  *idev;
2628         struct net_device *sp_dev;
2629         struct inet6_ifaddr *sp_ifa;
2630         struct rt6_info *sp_rt;
2631
2632         /* ::1 */
2633
2634         ASSERT_RTNL();
2635
2636         if ((idev = ipv6_find_idev(dev)) == NULL) {
2637                 pr_debug("%s: add_dev failed\n", __func__);
2638                 return;
2639         }
2640
2641         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2642
2643         /* Add routes to other interface's IPv6 addresses */
2644         for_each_netdev(dev_net(dev), sp_dev) {
2645                 if (!strcmp(sp_dev->name, dev->name))
2646                         continue;
2647
2648                 idev = __in6_dev_get(sp_dev);
2649                 if (!idev)
2650                         continue;
2651
2652                 read_lock_bh(&idev->lock);
2653                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2654
2655                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2656                                 continue;
2657
2658                         if (sp_ifa->rt)
2659                                 continue;
2660
2661                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2662
2663                         /* Failure cases are ignored */
2664                         if (!IS_ERR(sp_rt)) {
2665                                 sp_ifa->rt = sp_rt;
2666                                 ip6_ins_rt(sp_rt);
2667                         }
2668                 }
2669                 read_unlock_bh(&idev->lock);
2670         }
2671 }
2672
2673 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2674 {
2675         struct inet6_ifaddr *ifp;
2676         u32 addr_flags = IFA_F_PERMANENT;
2677
2678 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2679         if (idev->cnf.optimistic_dad &&
2680             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2681                 addr_flags |= IFA_F_OPTIMISTIC;
2682 #endif
2683
2684
2685         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2686         if (!IS_ERR(ifp)) {
2687                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2688                 addrconf_dad_start(ifp);
2689                 in6_ifa_put(ifp);
2690         }
2691 }
2692
2693 static void addrconf_dev_config(struct net_device *dev)
2694 {
2695         struct in6_addr addr;
2696         struct inet6_dev *idev;
2697
2698         ASSERT_RTNL();
2699
2700         if ((dev->type != ARPHRD_ETHER) &&
2701             (dev->type != ARPHRD_FDDI) &&
2702             (dev->type != ARPHRD_ARCNET) &&
2703             (dev->type != ARPHRD_INFINIBAND) &&
2704             (dev->type != ARPHRD_IEEE802154) &&
2705             (dev->type != ARPHRD_IEEE1394)) {
2706                 /* Alas, we support only Ethernet autoconfiguration. */
2707                 return;
2708         }
2709
2710         idev = addrconf_add_dev(dev);
2711         if (IS_ERR(idev))
2712                 return;
2713
2714         memset(&addr, 0, sizeof(struct in6_addr));
2715         addr.s6_addr32[0] = htonl(0xFE800000);
2716
2717         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2718                 addrconf_add_linklocal(idev, &addr);
2719 }
2720
2721 #if IS_ENABLED(CONFIG_IPV6_SIT)
2722 static void addrconf_sit_config(struct net_device *dev)
2723 {
2724         struct inet6_dev *idev;
2725
2726         ASSERT_RTNL();
2727
2728         /*
2729          * Configure the tunnel with one of our IPv4
2730          * addresses... we should configure all of
2731          * our v4 addrs in the tunnel
2732          */
2733
2734         if ((idev = ipv6_find_idev(dev)) == NULL) {
2735                 pr_debug("%s: add_dev failed\n", __func__);
2736                 return;
2737         }
2738
2739         if (dev->priv_flags & IFF_ISATAP) {
2740                 struct in6_addr addr;
2741
2742                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2743                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2744                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2745                         addrconf_add_linklocal(idev, &addr);
2746                 return;
2747         }
2748
2749         sit_add_v4_addrs(idev);
2750
2751         if (dev->flags&IFF_POINTOPOINT)
2752                 addrconf_add_mroute(dev);
2753         else
2754                 sit_route_add(dev);
2755 }
2756 #endif
2757
2758 #if IS_ENABLED(CONFIG_NET_IPGRE)
2759 static void addrconf_gre_config(struct net_device *dev)
2760 {
2761         struct inet6_dev *idev;
2762         struct in6_addr addr;
2763
2764         ASSERT_RTNL();
2765
2766         if ((idev = ipv6_find_idev(dev)) == NULL) {
2767                 pr_debug("%s: add_dev failed\n", __func__);
2768                 return;
2769         }
2770
2771         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2772         addrconf_prefix_route(&addr, 64, dev, 0, 0);
2773
2774         if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2775                 addrconf_add_linklocal(idev, &addr);
2776 }
2777 #endif
2778
2779 static inline int
2780 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2781 {
2782         struct in6_addr lladdr;
2783
2784         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2785                 addrconf_add_linklocal(idev, &lladdr);
2786                 return 0;
2787         }
2788         return -1;
2789 }
2790
2791 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2792 {
2793         struct net_device *link_dev;
2794         struct net *net = dev_net(idev->dev);
2795
2796         /* first try to inherit the link-local address from the link device */
2797         if (idev->dev->iflink &&
2798             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2799                 if (!ipv6_inherit_linklocal(idev, link_dev))
2800                         return;
2801         }
2802         /* then try to inherit it from any device */
2803         for_each_netdev(net, link_dev) {
2804                 if (!ipv6_inherit_linklocal(idev, link_dev))
2805                         return;
2806         }
2807         pr_debug("init ip6-ip6: add_linklocal failed\n");
2808 }
2809
2810 /*
2811  * Autoconfigure tunnel with a link-local address so routing protocols,
2812  * DHCPv6, MLD etc. can be run over the virtual link
2813  */
2814
2815 static void addrconf_ip6_tnl_config(struct net_device *dev)
2816 {
2817         struct inet6_dev *idev;
2818
2819         ASSERT_RTNL();
2820
2821         idev = addrconf_add_dev(dev);
2822         if (IS_ERR(idev)) {
2823                 pr_debug("init ip6-ip6: add_dev failed\n");
2824                 return;
2825         }
2826         ip6_tnl_add_linklocal(idev);
2827 }
2828
2829 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2830                            void *ptr)
2831 {
2832         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2833         struct inet6_dev *idev = __in6_dev_get(dev);
2834         int run_pending = 0;
2835         int err;
2836
2837         switch (event) {
2838         case NETDEV_REGISTER:
2839                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2840                         idev = ipv6_add_dev(dev);
2841                         if (!idev)
2842                                 return notifier_from_errno(-ENOMEM);
2843                 }
2844                 break;
2845
2846         case NETDEV_UP:
2847         case NETDEV_CHANGE:
2848                 if (dev->flags & IFF_SLAVE)
2849                         break;
2850
2851                 if (event == NETDEV_UP) {
2852                         if (!addrconf_qdisc_ok(dev)) {
2853                                 /* device is not ready yet. */
2854                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2855                                         dev->name);
2856                                 break;
2857                         }
2858
2859                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2860                                 idev = ipv6_add_dev(dev);
2861
2862                         if (idev) {
2863                                 idev->if_flags |= IF_READY;
2864                                 run_pending = 1;
2865                         }
2866                 } else {
2867                         if (!addrconf_qdisc_ok(dev)) {
2868                                 /* device is still not ready. */
2869                                 break;
2870                         }
2871
2872                         if (idev) {
2873                                 if (idev->if_flags & IF_READY)
2874                                         /* device is already configured. */
2875                                         break;
2876                                 idev->if_flags |= IF_READY;
2877                         }
2878
2879                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2880                                 dev->name);
2881
2882                         run_pending = 1;
2883                 }
2884
2885                 switch (dev->type) {
2886 #if IS_ENABLED(CONFIG_IPV6_SIT)
2887                 case ARPHRD_SIT:
2888                         addrconf_sit_config(dev);
2889                         break;
2890 #endif
2891 #if IS_ENABLED(CONFIG_NET_IPGRE)
2892                 case ARPHRD_IPGRE:
2893                         addrconf_gre_config(dev);
2894                         break;
2895 #endif
2896                 case ARPHRD_TUNNEL6:
2897                         addrconf_ip6_tnl_config(dev);
2898                         break;
2899                 case ARPHRD_LOOPBACK:
2900                         init_loopback(dev);
2901                         break;
2902
2903                 default:
2904                         addrconf_dev_config(dev);
2905                         break;
2906                 }
2907
2908                 if (idev) {
2909                         if (run_pending)
2910                                 addrconf_dad_run(idev);
2911
2912                         /*
2913                          * If the MTU changed during the interface down,
2914                          * when the interface up, the changed MTU must be
2915                          * reflected in the idev as well as routers.
2916                          */
2917                         if (idev->cnf.mtu6 != dev->mtu &&
2918                             dev->mtu >= IPV6_MIN_MTU) {
2919                                 rt6_mtu_change(dev, dev->mtu);
2920                                 idev->cnf.mtu6 = dev->mtu;
2921                         }
2922                         idev->tstamp = jiffies;
2923                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2924
2925                         /*
2926                          * If the changed mtu during down is lower than
2927                          * IPV6_MIN_MTU stop IPv6 on this interface.
2928                          */
2929                         if (dev->mtu < IPV6_MIN_MTU)
2930                                 addrconf_ifdown(dev, 1);
2931                 }
2932                 break;
2933
2934         case NETDEV_CHANGEMTU:
2935                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2936                         rt6_mtu_change(dev, dev->mtu);
2937                         idev->cnf.mtu6 = dev->mtu;
2938                         break;
2939                 }
2940
2941                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2942                         idev = ipv6_add_dev(dev);
2943                         if (idev)
2944                                 break;
2945                 }
2946
2947                 /*
2948                  * MTU falled under IPV6_MIN_MTU.
2949                  * Stop IPv6 on this interface.
2950                  */
2951
2952         case NETDEV_DOWN:
2953         case NETDEV_UNREGISTER:
2954                 /*
2955                  *      Remove all addresses from this interface.
2956                  */
2957                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2958                 break;
2959
2960         case NETDEV_CHANGENAME:
2961                 if (idev) {
2962                         snmp6_unregister_dev(idev);
2963                         addrconf_sysctl_unregister(idev);
2964                         addrconf_sysctl_register(idev);
2965                         err = snmp6_register_dev(idev);
2966                         if (err)
2967                                 return notifier_from_errno(err);
2968                 }
2969                 break;
2970
2971         case NETDEV_PRE_TYPE_CHANGE:
2972         case NETDEV_POST_TYPE_CHANGE:
2973                 addrconf_type_change(dev, event);
2974                 break;
2975         }
2976
2977         return NOTIFY_OK;
2978 }
2979
2980 /*
2981  *      addrconf module should be notified of a device going up
2982  */
2983 static struct notifier_block ipv6_dev_notf = {
2984         .notifier_call = addrconf_notify,
2985 };
2986
2987 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2988 {
2989         struct inet6_dev *idev;
2990         ASSERT_RTNL();
2991
2992         idev = __in6_dev_get(dev);
2993
2994         if (event == NETDEV_POST_TYPE_CHANGE)
2995                 ipv6_mc_remap(idev);
2996         else if (event == NETDEV_PRE_TYPE_CHANGE)
2997                 ipv6_mc_unmap(idev);
2998 }
2999
3000 static int addrconf_ifdown(struct net_device *dev, int how)
3001 {
3002         struct net *net = dev_net(dev);
3003         struct inet6_dev *idev;
3004         struct inet6_ifaddr *ifa;
3005         int state, i;
3006
3007         ASSERT_RTNL();
3008
3009         rt6_ifdown(net, dev);
3010         neigh_ifdown(&nd_tbl, dev);
3011
3012         idev = __in6_dev_get(dev);
3013         if (idev == NULL)
3014                 return -ENODEV;
3015
3016         /*
3017          * Step 1: remove reference to ipv6 device from parent device.
3018          *         Do not dev_put!
3019          */
3020         if (how) {
3021                 idev->dead = 1;
3022
3023                 /* protected by rtnl_lock */
3024                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3025
3026                 /* Step 1.5: remove snmp6 entry */
3027                 snmp6_unregister_dev(idev);
3028
3029         }
3030
3031         /* Step 2: clear hash table */
3032         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3033                 struct hlist_head *h = &inet6_addr_lst[i];
3034
3035                 spin_lock_bh(&addrconf_hash_lock);
3036         restart:
3037                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3038                         if (ifa->idev == idev) {
3039                                 hlist_del_init_rcu(&ifa->addr_lst);
3040                                 addrconf_del_dad_timer(ifa);
3041                                 goto restart;
3042                         }
3043                 }
3044                 spin_unlock_bh(&addrconf_hash_lock);
3045         }
3046
3047         write_lock_bh(&idev->lock);
3048
3049         addrconf_del_rs_timer(idev);
3050
3051         /* Step 2: clear flags for stateless addrconf */
3052         if (!how)
3053                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3054
3055 #ifdef CONFIG_IPV6_PRIVACY
3056         if (how && del_timer(&idev->regen_timer))
3057                 in6_dev_put(idev);
3058
3059         /* Step 3: clear tempaddr list */
3060         while (!list_empty(&idev->tempaddr_list)) {
3061                 ifa = list_first_entry(&idev->tempaddr_list,
3062                                        struct inet6_ifaddr, tmp_list);
3063                 list_del(&ifa->tmp_list);
3064                 write_unlock_bh(&idev->lock);
3065                 spin_lock_bh(&ifa->lock);
3066
3067                 if (ifa->ifpub) {
3068                         in6_ifa_put(ifa->ifpub);
3069                         ifa->ifpub = NULL;
3070                 }
3071                 spin_unlock_bh(&ifa->lock);
3072                 in6_ifa_put(ifa);
3073                 write_lock_bh(&idev->lock);
3074         }
3075 #endif
3076
3077         while (!list_empty(&idev->addr_list)) {
3078                 ifa = list_first_entry(&idev->addr_list,
3079                                        struct inet6_ifaddr, if_list);
3080                 addrconf_del_dad_timer(ifa);
3081
3082                 list_del(&ifa->if_list);
3083
3084                 write_unlock_bh(&idev->lock);
3085
3086                 spin_lock_bh(&ifa->state_lock);
3087                 state = ifa->state;
3088                 ifa->state = INET6_IFADDR_STATE_DEAD;
3089                 spin_unlock_bh(&ifa->state_lock);
3090
3091                 if (state != INET6_IFADDR_STATE_DEAD) {
3092                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3093                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3094                 }
3095                 in6_ifa_put(ifa);
3096
3097                 write_lock_bh(&idev->lock);
3098         }
3099
3100         write_unlock_bh(&idev->lock);
3101
3102         /* Step 5: Discard multicast list */
3103         if (how)
3104                 ipv6_mc_destroy_dev(idev);
3105         else
3106                 ipv6_mc_down(idev);
3107
3108         idev->tstamp = jiffies;
3109
3110         /* Last: Shot the device (if unregistered) */
3111         if (how) {
3112                 addrconf_sysctl_unregister(idev);
3113                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3114                 neigh_ifdown(&nd_tbl, dev);
3115                 in6_dev_put(idev);
3116         }
3117         return 0;
3118 }
3119
3120 static void addrconf_rs_timer(unsigned long data)
3121 {
3122         struct inet6_dev *idev = (struct inet6_dev *)data;
3123         struct in6_addr lladdr;
3124
3125         write_lock(&idev->lock);
3126         if (idev->dead || !(idev->if_flags & IF_READY))
3127                 goto out;
3128
3129         if (!ipv6_accept_ra(idev))
3130                 goto out;
3131
3132         /* Announcement received after solicitation was sent */
3133         if (idev->if_flags & IF_RA_RCVD)
3134                 goto out;
3135
3136         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3137                 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3138                         ndisc_send_rs(idev->dev, &lladdr,
3139                                       &in6addr_linklocal_allrouters);
3140                 else
3141                         goto out;
3142
3143                 /* The wait after the last probe can be shorter */
3144                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3145                                              idev->cnf.rtr_solicits) ?
3146                                       idev->cnf.rtr_solicit_delay :
3147                                       idev->cnf.rtr_solicit_interval);
3148         } else {
3149                 /*
3150                  * Note: we do not support deprecated "all on-link"
3151                  * assumption any longer.
3152                  */
3153                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3154         }
3155
3156 out:
3157         write_unlock(&idev->lock);
3158         in6_dev_put(idev);
3159 }
3160
3161 /*
3162  *      Duplicate Address Detection
3163  */
3164 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3165 {
3166         unsigned long rand_num;
3167         struct inet6_dev *idev = ifp->idev;
3168
3169         if (ifp->flags & IFA_F_OPTIMISTIC)
3170                 rand_num = 0;
3171         else
3172                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3173
3174         ifp->dad_probes = idev->cnf.dad_transmits;
3175         addrconf_mod_dad_timer(ifp, rand_num);
3176 }
3177
3178 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3179 {
3180         struct inet6_dev *idev = ifp->idev;
3181         struct net_device *dev = idev->dev;
3182
3183         addrconf_join_solict(dev, &ifp->addr);
3184
3185         net_srandom(ifp->addr.s6_addr32[3]);
3186
3187         read_lock_bh(&idev->lock);
3188         spin_lock(&ifp->lock);
3189         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3190                 goto out;
3191
3192         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3193             idev->cnf.accept_dad < 1 ||
3194             !(ifp->flags&IFA_F_TENTATIVE) ||
3195             ifp->flags & IFA_F_NODAD) {
3196                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3197                 spin_unlock(&ifp->lock);
3198                 read_unlock_bh(&idev->lock);
3199
3200                 addrconf_dad_completed(ifp);
3201                 return;
3202         }
3203
3204         if (!(idev->if_flags & IF_READY)) {
3205                 spin_unlock(&ifp->lock);
3206                 read_unlock_bh(&idev->lock);
3207                 /*
3208                  * If the device is not ready:
3209                  * - keep it tentative if it is a permanent address.
3210                  * - otherwise, kill it.
3211                  */
3212                 in6_ifa_hold(ifp);
3213                 addrconf_dad_stop(ifp, 0);
3214                 return;
3215         }
3216
3217         /*
3218          * Optimistic nodes can start receiving
3219          * Frames right away
3220          */
3221         if (ifp->flags & IFA_F_OPTIMISTIC)
3222                 ip6_ins_rt(ifp->rt);
3223
3224         addrconf_dad_kick(ifp);
3225 out:
3226         spin_unlock(&ifp->lock);
3227         read_unlock_bh(&idev->lock);
3228 }
3229
3230 static void addrconf_dad_timer(unsigned long data)
3231 {
3232         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3233         struct inet6_dev *idev = ifp->idev;
3234         struct in6_addr mcaddr;
3235
3236         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3237                 goto out;
3238
3239         write_lock(&idev->lock);
3240         if (idev->dead || !(idev->if_flags & IF_READY)) {
3241                 write_unlock(&idev->lock);
3242                 goto out;
3243         }
3244
3245         spin_lock(&ifp->lock);
3246         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3247                 spin_unlock(&ifp->lock);
3248                 write_unlock(&idev->lock);
3249                 goto out;
3250         }
3251
3252         if (ifp->dad_probes == 0) {
3253                 /*
3254                  * DAD was successful
3255                  */
3256
3257                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3258                 spin_unlock(&ifp->lock);
3259                 write_unlock(&idev->lock);
3260
3261                 addrconf_dad_completed(ifp);
3262
3263                 goto out;
3264         }
3265
3266         ifp->dad_probes--;
3267         addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3268         spin_unlock(&ifp->lock);
3269         write_unlock(&idev->lock);
3270
3271         /* send a neighbour solicitation for our addr */
3272         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3273         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3274 out:
3275         in6_ifa_put(ifp);
3276 }
3277
3278 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3279 {
3280         struct net_device *dev = ifp->idev->dev;
3281         struct in6_addr lladdr;
3282         bool send_rs, send_mld;
3283
3284         addrconf_del_dad_timer(ifp);
3285
3286         /*
3287          *      Configure the address for reception. Now it is valid.
3288          */
3289
3290         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3291
3292         /* If added prefix is link local and we are prepared to process
3293            router advertisements, start sending router solicitations.
3294          */
3295
3296         read_lock_bh(&ifp->idev->lock);
3297         spin_lock(&ifp->lock);
3298         send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3299                    ifp->idev->valid_ll_addr_cnt == 1;
3300         send_rs = send_mld &&
3301                   ipv6_accept_ra(ifp->idev) &&
3302                   ifp->idev->cnf.rtr_solicits > 0 &&
3303                   (dev->flags&IFF_LOOPBACK) == 0;
3304         spin_unlock(&ifp->lock);
3305         read_unlock_bh(&ifp->idev->lock);
3306
3307         /* While dad is in progress mld report's source address is in6_addrany.
3308          * Resend with proper ll now.
3309          */
3310         if (send_mld)
3311                 ipv6_mc_dad_complete(ifp->idev);
3312
3313         if (send_rs) {
3314                 /*
3315                  *      If a host as already performed a random delay
3316                  *      [...] as part of DAD [...] there is no need
3317                  *      to delay again before sending the first RS
3318                  */
3319                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3320                         return;
3321                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3322
3323                 write_lock_bh(&ifp->idev->lock);
3324                 spin_lock(&ifp->lock);
3325                 ifp->idev->rs_probes = 1;
3326                 ifp->idev->if_flags |= IF_RS_SENT;
3327                 addrconf_mod_rs_timer(ifp->idev,
3328                                       ifp->idev->cnf.rtr_solicit_interval);
3329                 spin_unlock(&ifp->lock);
3330                 write_unlock_bh(&ifp->idev->lock);
3331         }
3332 }
3333
3334 static void addrconf_dad_run(struct inet6_dev *idev)
3335 {
3336         struct inet6_ifaddr *ifp;
3337
3338         read_lock_bh(&idev->lock);
3339         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3340                 spin_lock(&ifp->lock);
3341                 if (ifp->flags & IFA_F_TENTATIVE &&
3342                     ifp->state == INET6_IFADDR_STATE_DAD)
3343                         addrconf_dad_kick(ifp);
3344                 spin_unlock(&ifp->lock);
3345         }
3346         read_unlock_bh(&idev->lock);
3347 }
3348
3349 #ifdef CONFIG_PROC_FS
3350 struct if6_iter_state {
3351         struct seq_net_private p;
3352         int bucket;
3353         int offset;
3354 };
3355
3356 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3357 {
3358         struct inet6_ifaddr *ifa = NULL;
3359         struct if6_iter_state *state = seq->private;
3360         struct net *net = seq_file_net(seq);
3361         int p = 0;
3362
3363         /* initial bucket if pos is 0 */
3364         if (pos == 0) {
3365                 state->bucket = 0;
3366                 state->offset = 0;
3367         }
3368
3369         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3370                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3371                                          addr_lst) {
3372                         if (!net_eq(dev_net(ifa->idev->dev), net))
3373                                 continue;
3374                         /* sync with offset */
3375                         if (p < state->offset) {
3376                                 p++;
3377                                 continue;
3378                         }
3379                         state->offset++;
3380                         return ifa;
3381                 }
3382
3383                 /* prepare for next bucket */
3384                 state->offset = 0;
3385                 p = 0;
3386         }
3387         return NULL;
3388 }
3389
3390 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3391                                          struct inet6_ifaddr *ifa)
3392 {
3393         struct if6_iter_state *state = seq->private;
3394         struct net *net = seq_file_net(seq);
3395
3396         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3397                 if (!net_eq(dev_net(ifa->idev->dev), net))
3398                         continue;
3399                 state->offset++;
3400                 return ifa;
3401         }
3402
3403         while (++state->bucket < IN6_ADDR_HSIZE) {
3404                 state->offset = 0;
3405                 hlist_for_each_entry_rcu_bh(ifa,
3406                                      &inet6_addr_lst[state->bucket], addr_lst) {
3407                         if (!net_eq(dev_net(ifa->idev->dev), net))
3408                                 continue;
3409                         state->offset++;
3410                         return ifa;
3411                 }
3412         }
3413
3414         return NULL;
3415 }
3416
3417 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3418         __acquires(rcu_bh)
3419 {
3420         rcu_read_lock_bh();
3421         return if6_get_first(seq, *pos);
3422 }
3423
3424 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3425 {
3426         struct inet6_ifaddr *ifa;
3427
3428         ifa = if6_get_next(seq, v);
3429         ++*pos;
3430         return ifa;
3431 }
3432
3433 static void if6_seq_stop(struct seq_file *seq, void *v)
3434         __releases(rcu_bh)
3435 {
3436         rcu_read_unlock_bh();
3437 }
3438
3439 static int if6_seq_show(struct seq_file *seq, void *v)
3440 {
3441         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3442         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3443                    &ifp->addr,
3444                    ifp->idev->dev->ifindex,
3445                    ifp->prefix_len,
3446                    ifp->scope,
3447                    ifp->flags,
3448                    ifp->idev->dev->name);
3449         return 0;
3450 }
3451
3452 static const struct seq_operations if6_seq_ops = {
3453         .start  = if6_seq_start,
3454         .next   = if6_seq_next,
3455         .show   = if6_seq_show,
3456         .stop   = if6_seq_stop,
3457 };
3458
3459 static int if6_seq_open(struct inode *inode, struct file *file)
3460 {
3461         return seq_open_net(inode, file, &if6_seq_ops,
3462                             sizeof(struct if6_iter_state));
3463 }
3464
3465 static const struct file_operations if6_fops = {
3466         .owner          = THIS_MODULE,
3467         .open           = if6_seq_open,
3468         .read           = seq_read,
3469         .llseek         = seq_lseek,
3470         .release        = seq_release_net,
3471 };
3472
3473 static int __net_init if6_proc_net_init(struct net *net)
3474 {
3475         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3476                 return -ENOMEM;
3477         return 0;
3478 }
3479
3480 static void __net_exit if6_proc_net_exit(struct net *net)
3481 {
3482         remove_proc_entry("if_inet6", net->proc_net);
3483 }
3484
3485 static struct pernet_operations if6_proc_net_ops = {
3486        .init = if6_proc_net_init,
3487        .exit = if6_proc_net_exit,
3488 };
3489
3490 int __init if6_proc_init(void)
3491 {
3492         return register_pernet_subsys(&if6_proc_net_ops);
3493 }
3494
3495 void if6_proc_exit(void)
3496 {
3497         unregister_pernet_subsys(&if6_proc_net_ops);
3498 }
3499 #endif  /* CONFIG_PROC_FS */
3500
3501 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3502 /* Check if address is a home address configured on any interface. */
3503 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3504 {
3505         int ret = 0;
3506         struct inet6_ifaddr *ifp = NULL;
3507         unsigned int hash = inet6_addr_hash(addr);
3508
3509         rcu_read_lock_bh();
3510         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3511                 if (!net_eq(dev_net(ifp->idev->dev), net))
3512                         continue;
3513                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3514                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3515                         ret = 1;
3516                         break;
3517                 }
3518         }
3519         rcu_read_unlock_bh();
3520         return ret;
3521 }
3522 #endif
3523
3524 /*
3525  *      Periodic address status verification
3526  */
3527
3528 static void addrconf_verify(unsigned long foo)
3529 {
3530         unsigned long now, next, next_sec, next_sched;
3531         struct inet6_ifaddr *ifp;
3532         int i;
3533
3534         rcu_read_lock_bh();
3535         spin_lock(&addrconf_verify_lock);
3536         now = jiffies;
3537         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3538
3539         del_timer(&addr_chk_timer);
3540
3541         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3542 restart:
3543                 hlist_for_each_entry_rcu_bh(ifp,
3544                                          &inet6_addr_lst[i], addr_lst) {
3545                         unsigned long age;
3546
3547                         if (ifp->flags & IFA_F_PERMANENT)
3548                                 continue;
3549
3550                         spin_lock(&ifp->lock);
3551                         /* We try to batch several events at once. */
3552                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3553
3554                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3555                             age >= ifp->valid_lft) {
3556                                 spin_unlock(&ifp->lock);
3557                                 in6_ifa_hold(ifp);
3558                                 ipv6_del_addr(ifp);
3559                                 goto restart;
3560                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3561                                 spin_unlock(&ifp->lock);
3562                                 continue;
3563                         } else if (age >= ifp->prefered_lft) {
3564                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3565                                 int deprecate = 0;
3566
3567                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3568                                         deprecate = 1;
3569                                         ifp->flags |= IFA_F_DEPRECATED;
3570                                 }
3571
3572                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3573                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3574
3575                                 spin_unlock(&ifp->lock);
3576
3577                                 if (deprecate) {
3578                                         in6_ifa_hold(ifp);
3579
3580                                         ipv6_ifa_notify(0, ifp);
3581                                         in6_ifa_put(ifp);
3582                                         goto restart;
3583                                 }
3584 #ifdef CONFIG_IPV6_PRIVACY
3585                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3586                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3587                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3588                                         ifp->idev->cnf.dad_transmits *
3589                                         ifp->idev->nd_parms->retrans_time / HZ;
3590
3591                                 if (age >= ifp->prefered_lft - regen_advance) {
3592                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3593                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3594                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3595                                         if (!ifp->regen_count && ifpub) {
3596                                                 ifp->regen_count++;
3597                                                 in6_ifa_hold(ifp);
3598                                                 in6_ifa_hold(ifpub);
3599                                                 spin_unlock(&ifp->lock);
3600
3601                                                 spin_lock(&ifpub->lock);
3602                                                 ifpub->regen_count = 0;
3603                                                 spin_unlock(&ifpub->lock);
3604                                                 ipv6_create_tempaddr(ifpub, ifp);
3605                                                 in6_ifa_put(ifpub);
3606                                                 in6_ifa_put(ifp);
3607                                                 goto restart;
3608                                         }
3609                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3610                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3611                                 spin_unlock(&ifp->lock);
3612 #endif
3613                         } else {
3614                                 /* ifp->prefered_lft <= ifp->valid_lft */
3615                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3616                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3617                                 spin_unlock(&ifp->lock);
3618                         }
3619                 }
3620         }
3621
3622         next_sec = round_jiffies_up(next);
3623         next_sched = next;
3624
3625         /* If rounded timeout is accurate enough, accept it. */
3626         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3627                 next_sched = next_sec;
3628
3629         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3630         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3631                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3632
3633         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3634               now, next, next_sec, next_sched));
3635
3636         addr_chk_timer.expires = next_sched;
3637         add_timer(&addr_chk_timer);
3638         spin_unlock(&addrconf_verify_lock);
3639         rcu_read_unlock_bh();
3640 }
3641
3642 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3643                                      struct in6_addr **peer_pfx)
3644 {
3645         struct in6_addr *pfx = NULL;
3646
3647         *peer_pfx = NULL;
3648
3649         if (addr)
3650                 pfx = nla_data(addr);
3651
3652         if (local) {
3653                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3654                         *peer_pfx = pfx;
3655                 pfx = nla_data(local);
3656         }
3657
3658         return pfx;
3659 }
3660
3661 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3662         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3663         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3664         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3665 };
3666
3667 static int
3668 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3669 {
3670         struct net *net = sock_net(skb->sk);
3671         struct ifaddrmsg *ifm;
3672         struct nlattr *tb[IFA_MAX+1];
3673         struct in6_addr *pfx, *peer_pfx;
3674         int err;
3675
3676         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3677         if (err < 0)
3678                 return err;
3679
3680         ifm = nlmsg_data(nlh);
3681         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3682         if (pfx == NULL)
3683                 return -EINVAL;
3684
3685         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3686 }
3687
3688 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3689                              u32 prefered_lft, u32 valid_lft)
3690 {
3691         u32 flags;
3692         clock_t expires;
3693         unsigned long timeout;
3694
3695         if (!valid_lft || (prefered_lft > valid_lft))
3696                 return -EINVAL;
3697
3698         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3699         if (addrconf_finite_timeout(timeout)) {
3700                 expires = jiffies_to_clock_t(timeout * HZ);
3701                 valid_lft = timeout;
3702                 flags = RTF_EXPIRES;
3703         } else {
3704                 expires = 0;
3705                 flags = 0;
3706                 ifa_flags |= IFA_F_PERMANENT;
3707         }
3708
3709         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3710         if (addrconf_finite_timeout(timeout)) {
3711                 if (timeout == 0)
3712                         ifa_flags |= IFA_F_DEPRECATED;
3713                 prefered_lft = timeout;
3714         }
3715
3716         spin_lock_bh(&ifp->lock);
3717         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3718         ifp->tstamp = jiffies;
3719         ifp->valid_lft = valid_lft;
3720         ifp->prefered_lft = prefered_lft;
3721
3722         spin_unlock_bh(&ifp->lock);
3723         if (!(ifp->flags&IFA_F_TENTATIVE))
3724                 ipv6_ifa_notify(0, ifp);
3725
3726         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3727                               expires, flags);
3728         addrconf_verify(0);
3729
3730         return 0;
3731 }
3732
3733 static int
3734 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3735 {
3736         struct net *net = sock_net(skb->sk);
3737         struct ifaddrmsg *ifm;
3738         struct nlattr *tb[IFA_MAX+1];
3739         struct in6_addr *pfx, *peer_pfx;
3740         struct inet6_ifaddr *ifa;
3741         struct net_device *dev;
3742         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3743         u8 ifa_flags;
3744         int err;
3745
3746         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3747         if (err < 0)
3748                 return err;
3749
3750         ifm = nlmsg_data(nlh);
3751         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3752         if (pfx == NULL)
3753                 return -EINVAL;
3754
3755         if (tb[IFA_CACHEINFO]) {
3756                 struct ifa_cacheinfo *ci;
3757
3758                 ci = nla_data(tb[IFA_CACHEINFO]);
3759                 valid_lft = ci->ifa_valid;
3760                 preferred_lft = ci->ifa_prefered;
3761         } else {
3762                 preferred_lft = INFINITY_LIFE_TIME;
3763                 valid_lft = INFINITY_LIFE_TIME;
3764         }
3765
3766         dev =  __dev_get_by_index(net, ifm->ifa_index);
3767         if (dev == NULL)
3768                 return -ENODEV;
3769
3770         /* We ignore other flags so far. */
3771         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3772
3773         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3774         if (ifa == NULL) {
3775                 /*
3776                  * It would be best to check for !NLM_F_CREATE here but
3777                  * userspace alreay relies on not having to provide this.
3778                  */
3779                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3780                                       ifm->ifa_prefixlen, ifa_flags,
3781                                       preferred_lft, valid_lft);
3782         }
3783
3784         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3785             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3786                 err = -EEXIST;
3787         else
3788                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3789
3790         in6_ifa_put(ifa);
3791
3792         return err;
3793 }
3794
3795 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3796                           u8 scope, int ifindex)
3797 {
3798         struct ifaddrmsg *ifm;
3799
3800         ifm = nlmsg_data(nlh);
3801         ifm->ifa_family = AF_INET6;
3802         ifm->ifa_prefixlen = prefixlen;
3803         ifm->ifa_flags = flags;
3804         ifm->ifa_scope = scope;
3805         ifm->ifa_index = ifindex;
3806 }
3807
3808 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3809                          unsigned long tstamp, u32 preferred, u32 valid)
3810 {
3811         struct ifa_cacheinfo ci;
3812
3813         ci.cstamp = cstamp_delta(cstamp);
3814         ci.tstamp = cstamp_delta(tstamp);
3815         ci.ifa_prefered = preferred;
3816         ci.ifa_valid = valid;
3817
3818         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3819 }
3820
3821 static inline int rt_scope(int ifa_scope)
3822 {
3823         if (ifa_scope & IFA_HOST)
3824                 return RT_SCOPE_HOST;
3825         else if (ifa_scope & IFA_LINK)
3826                 return RT_SCOPE_LINK;
3827         else if (ifa_scope & IFA_SITE)
3828                 return RT_SCOPE_SITE;
3829         else
3830                 return RT_SCOPE_UNIVERSE;
3831 }
3832
3833 static inline int inet6_ifaddr_msgsize(void)
3834 {
3835         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3836                + nla_total_size(16) /* IFA_LOCAL */
3837                + nla_total_size(16) /* IFA_ADDRESS */
3838                + nla_total_size(sizeof(struct ifa_cacheinfo));
3839 }
3840
3841 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3842                              u32 portid, u32 seq, int event, unsigned int flags)
3843 {
3844         struct nlmsghdr  *nlh;
3845         u32 preferred, valid;
3846
3847         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3848         if (nlh == NULL)
3849                 return -EMSGSIZE;
3850
3851         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3852                       ifa->idev->dev->ifindex);
3853
3854         if (!(ifa->flags&IFA_F_PERMANENT)) {
3855                 preferred = ifa->prefered_lft;
3856                 valid = ifa->valid_lft;
3857                 if (preferred != INFINITY_LIFE_TIME) {
3858                         long tval = (jiffies - ifa->tstamp)/HZ;
3859                         if (preferred > tval)
3860                                 preferred -= tval;
3861                         else
3862                                 preferred = 0;
3863                         if (valid != INFINITY_LIFE_TIME) {
3864                                 if (valid > tval)
3865                                         valid -= tval;
3866                                 else
3867                                         valid = 0;
3868                         }
3869                 }
3870         } else {
3871                 preferred = INFINITY_LIFE_TIME;
3872                 valid = INFINITY_LIFE_TIME;
3873         }
3874
3875         if (!ipv6_addr_any(&ifa->peer_addr)) {
3876                 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3877                     nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3878                         goto error;
3879         } else
3880                 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3881                         goto error;
3882
3883         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3884                 goto error;
3885
3886         return nlmsg_end(skb, nlh);
3887
3888 error:
3889         nlmsg_cancel(skb, nlh);
3890         return -EMSGSIZE;
3891 }
3892
3893 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3894                                 u32 portid, u32 seq, int event, u16 flags)
3895 {
3896         struct nlmsghdr  *nlh;
3897         u8 scope = RT_SCOPE_UNIVERSE;
3898         int ifindex = ifmca->idev->dev->ifindex;
3899
3900         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3901                 scope = RT_SCOPE_SITE;
3902
3903         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3904         if (nlh == NULL)
3905                 return -EMSGSIZE;
3906
3907         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3908         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3909             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3910                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3911                 nlmsg_cancel(skb, nlh);
3912                 return -EMSGSIZE;
3913         }
3914
3915         return nlmsg_end(skb, nlh);
3916 }
3917
3918 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3919                                 u32 portid, u32 seq, int event, unsigned int flags)
3920 {
3921         struct nlmsghdr  *nlh;
3922         u8 scope = RT_SCOPE_UNIVERSE;
3923         int ifindex = ifaca->aca_idev->dev->ifindex;
3924
3925         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3926                 scope = RT_SCOPE_SITE;
3927
3928         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3929         if (nlh == NULL)
3930                 return -EMSGSIZE;
3931
3932         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3933         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3934             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3935                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3936                 nlmsg_cancel(skb, nlh);
3937                 return -EMSGSIZE;
3938         }
3939
3940         return nlmsg_end(skb, nlh);
3941 }
3942
3943 enum addr_type_t {
3944         UNICAST_ADDR,
3945         MULTICAST_ADDR,
3946         ANYCAST_ADDR,
3947 };
3948
3949 /* called with rcu_read_lock() */
3950 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3951                           struct netlink_callback *cb, enum addr_type_t type,
3952                           int s_ip_idx, int *p_ip_idx)
3953 {
3954         struct ifmcaddr6 *ifmca;
3955         struct ifacaddr6 *ifaca;
3956         int err = 1;
3957         int ip_idx = *p_ip_idx;
3958
3959         read_lock_bh(&idev->lock);
3960         switch (type) {
3961         case UNICAST_ADDR: {
3962                 struct inet6_ifaddr *ifa;
3963
3964                 /* unicast address incl. temp addr */
3965                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3966                         if (++ip_idx < s_ip_idx)
3967                                 continue;
3968                         err = inet6_fill_ifaddr(skb, ifa,
3969                                                 NETLINK_CB(cb->skb).portid,
3970                                                 cb->nlh->nlmsg_seq,
3971                                                 RTM_NEWADDR,
3972                                                 NLM_F_MULTI);
3973                         if (err <= 0)
3974                                 break;
3975                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3976                 }
3977                 break;
3978         }
3979         case MULTICAST_ADDR:
3980                 /* multicast address */
3981                 for (ifmca = idev->mc_list; ifmca;
3982                      ifmca = ifmca->next, ip_idx++) {
3983                         if (ip_idx < s_ip_idx)
3984                                 continue;
3985                         err = inet6_fill_ifmcaddr(skb, ifmca,
3986                                                   NETLINK_CB(cb->skb).portid,
3987                                                   cb->nlh->nlmsg_seq,
3988                                                   RTM_GETMULTICAST,
3989                                                   NLM_F_MULTI);
3990                         if (err <= 0)
3991                                 break;
3992                 }
3993                 break;
3994         case ANYCAST_ADDR:
3995                 /* anycast address */
3996                 for (ifaca = idev->ac_list; ifaca;
3997                      ifaca = ifaca->aca_next, ip_idx++) {
3998                         if (ip_idx < s_ip_idx)
3999                                 continue;
4000                         err = inet6_fill_ifacaddr(skb, ifaca,
4001                                                   NETLINK_CB(cb->skb).portid,
4002                                                   cb->nlh->nlmsg_seq,
4003                                                   RTM_GETANYCAST,
4004                                                   NLM_F_MULTI);
4005                         if (err <= 0)
4006                                 break;
4007                 }
4008                 break;
4009         default:
4010                 break;
4011         }
4012         read_unlock_bh(&idev->lock);
4013         *p_ip_idx = ip_idx;
4014         return err;
4015 }
4016
4017 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4018                            enum addr_type_t type)
4019 {
4020         struct net *net = sock_net(skb->sk);
4021         int h, s_h;
4022         int idx, ip_idx;
4023         int s_idx, s_ip_idx;
4024         struct net_device *dev;
4025         struct inet6_dev *idev;
4026         struct hlist_head *head;
4027
4028         s_h = cb->args[0];
4029         s_idx = idx = cb->args[1];
4030         s_ip_idx = ip_idx = cb->args[2];
4031
4032         rcu_read_lock();
4033         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4034         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4035                 idx = 0;
4036                 head = &net->dev_index_head[h];
4037                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4038                         if (idx < s_idx)
4039                                 goto cont;
4040                         if (h > s_h || idx > s_idx)
4041                                 s_ip_idx = 0;
4042                         ip_idx = 0;
4043                         idev = __in6_dev_get(dev);
4044                         if (!idev)
4045                                 goto cont;
4046
4047                         if (in6_dump_addrs(idev, skb, cb, type,
4048                                            s_ip_idx, &ip_idx) <= 0)
4049                                 goto done;
4050 cont:
4051                         idx++;
4052                 }
4053         }
4054 done:
4055         rcu_read_unlock();
4056         cb->args[0] = h;
4057         cb->args[1] = idx;
4058         cb->args[2] = ip_idx;
4059
4060         return skb->len;
4061 }
4062
4063 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4064 {
4065         enum addr_type_t type = UNICAST_ADDR;
4066
4067         return inet6_dump_addr(skb, cb, type);
4068 }
4069
4070 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4071 {
4072         enum addr_type_t type = MULTICAST_ADDR;
4073
4074         return inet6_dump_addr(skb, cb, type);
4075 }
4076
4077
4078 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4079 {
4080         enum addr_type_t type = ANYCAST_ADDR;
4081
4082         return inet6_dump_addr(skb, cb, type);
4083 }
4084
4085 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4086 {
4087         struct net *net = sock_net(in_skb->sk);
4088         struct ifaddrmsg *ifm;
4089         struct nlattr *tb[IFA_MAX+1];
4090         struct in6_addr *addr = NULL, *peer;
4091         struct net_device *dev = NULL;
4092         struct inet6_ifaddr *ifa;
4093         struct sk_buff *skb;
4094         int err;
4095
4096         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4097         if (err < 0)
4098                 goto errout;
4099
4100         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4101         if (addr == NULL) {
4102                 err = -EINVAL;
4103                 goto errout;
4104         }
4105
4106         ifm = nlmsg_data(nlh);
4107         if (ifm->ifa_index)
4108                 dev = __dev_get_by_index(net, ifm->ifa_index);
4109
4110         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4111         if (!ifa) {
4112                 err = -EADDRNOTAVAIL;
4113                 goto errout;
4114         }
4115
4116         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4117         if (!skb) {
4118                 err = -ENOBUFS;
4119                 goto errout_ifa;
4120         }
4121
4122         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4123                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4124         if (err < 0) {
4125                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4126                 WARN_ON(err == -EMSGSIZE);
4127                 kfree_skb(skb);
4128                 goto errout_ifa;
4129         }
4130         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4131 errout_ifa:
4132         in6_ifa_put(ifa);
4133 errout:
4134         return err;
4135 }
4136
4137 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4138 {
4139         struct sk_buff *skb;
4140         struct net *net = dev_net(ifa->idev->dev);
4141         int err = -ENOBUFS;
4142
4143         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4144         if (skb == NULL)
4145                 goto errout;
4146
4147         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4148         if (err < 0) {
4149                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4150                 WARN_ON(err == -EMSGSIZE);
4151                 kfree_skb(skb);
4152                 goto errout;
4153         }
4154         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4155         return;
4156 errout:
4157         if (err < 0)
4158                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4159 }
4160
4161 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4162                                 __s32 *array, int bytes)
4163 {
4164         BUG_ON(bytes < (DEVCONF_MAX * 4));
4165
4166         memset(array, 0, bytes);
4167         array[DEVCONF_FORWARDING] = cnf->forwarding;
4168         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4169         array[DEVCONF_MTU6] = cnf->mtu6;
4170         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4171         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4172         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4173         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4174         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4175         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4176                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4177         array[DEVCONF_RTR_SOLICIT_DELAY] =
4178                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4179         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4180 #ifdef CONFIG_IPV6_PRIVACY
4181         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4182         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4183         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4184         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4185         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4186 #endif
4187         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4188         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4189         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4190 #ifdef CONFIG_IPV6_ROUTER_PREF
4191         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4192         array[DEVCONF_RTR_PROBE_INTERVAL] =
4193                 jiffies_to_msecs(cnf->rtr_probe_interval);
4194 #ifdef CONFIG_IPV6_ROUTE_INFO
4195         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4196 #endif
4197 #endif
4198         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4199         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4200 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4201         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4202 #endif
4203 #ifdef CONFIG_IPV6_MROUTE
4204         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4205 #endif
4206         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4207         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4208         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4209         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4210 }
4211
4212 static inline size_t inet6_ifla6_size(void)
4213 {
4214         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4215              + nla_total_size(sizeof(struct ifla_cacheinfo))
4216              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4217              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4218              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4219              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4220 }
4221
4222 static inline size_t inet6_if_nlmsg_size(void)
4223 {
4224         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4225                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4226                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4227                + nla_total_size(4) /* IFLA_MTU */
4228                + nla_total_size(4) /* IFLA_LINK */
4229                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4230 }
4231
4232 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4233                                       int items, int bytes)
4234 {
4235         int i;
4236         int pad = bytes - sizeof(u64) * items;
4237         BUG_ON(pad < 0);
4238
4239         /* Use put_unaligned() because stats may not be aligned for u64. */
4240         put_unaligned(items, &stats[0]);
4241         for (i = 1; i < items; i++)
4242                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4243
4244         memset(&stats[items], 0, pad);
4245 }
4246
4247 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4248                                       int items, int bytes, size_t syncpoff)
4249 {
4250         int i;
4251         int pad = bytes - sizeof(u64) * items;
4252         BUG_ON(pad < 0);
4253
4254         /* Use put_unaligned() because stats may not be aligned for u64. */
4255         put_unaligned(items, &stats[0]);
4256         for (i = 1; i < items; i++)
4257                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4258
4259         memset(&stats[items], 0, pad);
4260 }
4261
4262 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4263                              int bytes)
4264 {
4265         switch (attrtype) {
4266         case IFLA_INET6_STATS:
4267                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4268                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4269                 break;
4270         case IFLA_INET6_ICMP6STATS:
4271                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4272                 break;
4273         }
4274 }
4275
4276 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4277 {
4278         struct nlattr *nla;
4279         struct ifla_cacheinfo ci;
4280
4281         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4282                 goto nla_put_failure;
4283         ci.max_reasm_len = IPV6_MAXPLEN;
4284         ci.tstamp = cstamp_delta(idev->tstamp);
4285         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4286         ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4287         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4288                 goto nla_put_failure;
4289         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4290         if (nla == NULL)
4291                 goto nla_put_failure;
4292         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4293
4294         /* XXX - MC not implemented */
4295
4296         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4297         if (nla == NULL)
4298                 goto nla_put_failure;
4299         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4300
4301         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4302         if (nla == NULL)
4303                 goto nla_put_failure;
4304         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4305
4306         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4307         if (nla == NULL)
4308                 goto nla_put_failure;
4309         read_lock_bh(&idev->lock);
4310         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4311         read_unlock_bh(&idev->lock);
4312
4313         return 0;
4314
4315 nla_put_failure:
4316         return -EMSGSIZE;
4317 }
4318
4319 static size_t inet6_get_link_af_size(const struct net_device *dev)
4320 {
4321         if (!__in6_dev_get(dev))
4322                 return 0;
4323
4324         return inet6_ifla6_size();
4325 }
4326
4327 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4328 {
4329         struct inet6_dev *idev = __in6_dev_get(dev);
4330
4331         if (!idev)
4332                 return -ENODATA;
4333
4334         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4335                 return -EMSGSIZE;
4336
4337         return 0;
4338 }
4339
4340 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4341 {
4342         struct inet6_ifaddr *ifp;
4343         struct net_device *dev = idev->dev;
4344         bool update_rs = false;
4345         struct in6_addr ll_addr;
4346
4347         if (token == NULL)
4348                 return -EINVAL;
4349         if (ipv6_addr_any(token))
4350                 return -EINVAL;
4351         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4352                 return -EINVAL;
4353         if (!ipv6_accept_ra(idev))
4354                 return -EINVAL;
4355         if (idev->cnf.rtr_solicits <= 0)
4356                 return -EINVAL;
4357
4358         write_lock_bh(&idev->lock);
4359
4360         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4361         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4362
4363         write_unlock_bh(&idev->lock);
4364
4365         if (!idev->dead && (idev->if_flags & IF_READY) &&
4366             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4367                              IFA_F_OPTIMISTIC)) {
4368
4369                 /* If we're not ready, then normal ifup will take care
4370                  * of this. Otherwise, we need to request our rs here.
4371                  */
4372                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4373                 update_rs = true;
4374         }
4375
4376         write_lock_bh(&idev->lock);
4377
4378         if (update_rs) {
4379                 idev->if_flags |= IF_RS_SENT;
4380                 idev->rs_probes = 1;
4381                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4382         }
4383
4384         /* Well, that's kinda nasty ... */
4385         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4386                 spin_lock(&ifp->lock);
4387                 if (ifp->tokenized) {
4388                         ifp->valid_lft = 0;
4389                         ifp->prefered_lft = 0;
4390                 }
4391                 spin_unlock(&ifp->lock);
4392         }
4393
4394         write_unlock_bh(&idev->lock);
4395         addrconf_verify(0);
4396         return 0;
4397 }
4398
4399 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4400 {
4401         int err = -EINVAL;
4402         struct inet6_dev *idev = __in6_dev_get(dev);
4403         struct nlattr *tb[IFLA_INET6_MAX + 1];
4404
4405         if (!idev)
4406                 return -EAFNOSUPPORT;
4407
4408         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4409                 BUG();
4410
4411         if (tb[IFLA_INET6_TOKEN])
4412                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4413
4414         return err;
4415 }
4416
4417 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4418                              u32 portid, u32 seq, int event, unsigned int flags)
4419 {
4420         struct net_device *dev = idev->dev;
4421         struct ifinfomsg *hdr;
4422         struct nlmsghdr *nlh;
4423         void *protoinfo;
4424
4425         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4426         if (nlh == NULL)
4427                 return -EMSGSIZE;
4428
4429         hdr = nlmsg_data(nlh);
4430         hdr->ifi_family = AF_INET6;
4431         hdr->__ifi_pad = 0;
4432         hdr->ifi_type = dev->type;
4433         hdr->ifi_index = dev->ifindex;
4434         hdr->ifi_flags = dev_get_flags(dev);
4435         hdr->ifi_change = 0;
4436
4437         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4438             (dev->addr_len &&
4439              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4440             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4441             (dev->ifindex != dev->iflink &&
4442              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4443                 goto nla_put_failure;
4444         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4445         if (protoinfo == NULL)
4446                 goto nla_put_failure;
4447
4448         if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4449                 goto nla_put_failure;
4450
4451         nla_nest_end(skb, protoinfo);
4452         return nlmsg_end(skb, nlh);
4453
4454 nla_put_failure:
4455         nlmsg_cancel(skb, nlh);
4456         return -EMSGSIZE;
4457 }
4458
4459 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4460 {
4461         struct net *net = sock_net(skb->sk);
4462         int h, s_h;
4463         int idx = 0, s_idx;
4464         struct net_device *dev;
4465         struct inet6_dev *idev;
4466         struct hlist_head *head;
4467
4468         s_h = cb->args[0];
4469         s_idx = cb->args[1];
4470
4471         rcu_read_lock();
4472         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4473                 idx = 0;
4474                 head = &net->dev_index_head[h];
4475                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4476                         if (idx < s_idx)
4477                                 goto cont;
4478                         idev = __in6_dev_get(dev);
4479                         if (!idev)
4480                                 goto cont;
4481                         if (inet6_fill_ifinfo(skb, idev,
4482                                               NETLINK_CB(cb->skb).portid,
4483                                               cb->nlh->nlmsg_seq,
4484                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
4485                                 goto out;
4486 cont:
4487                         idx++;
4488                 }
4489         }
4490 out:
4491         rcu_read_unlock();
4492         cb->args[1] = idx;
4493         cb->args[0] = h;
4494
4495         return skb->len;
4496 }
4497
4498 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4499 {
4500         struct sk_buff *skb;
4501         struct net *net = dev_net(idev->dev);
4502         int err = -ENOBUFS;
4503
4504         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4505         if (skb == NULL)
4506                 goto errout;
4507
4508         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4509         if (err < 0) {
4510                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4511                 WARN_ON(err == -EMSGSIZE);
4512                 kfree_skb(skb);
4513                 goto errout;
4514         }
4515         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4516         return;
4517 errout:
4518         if (err < 0)
4519                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4520 }
4521
4522 static inline size_t inet6_prefix_nlmsg_size(void)
4523 {
4524         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4525                + nla_total_size(sizeof(struct in6_addr))
4526                + nla_total_size(sizeof(struct prefix_cacheinfo));
4527 }
4528
4529 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4530                              struct prefix_info *pinfo, u32 portid, u32 seq,
4531                              int event, unsigned int flags)
4532 {
4533         struct prefixmsg *pmsg;
4534         struct nlmsghdr *nlh;
4535         struct prefix_cacheinfo ci;
4536
4537         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4538         if (nlh == NULL)
4539                 return -EMSGSIZE;
4540
4541         pmsg = nlmsg_data(nlh);
4542         pmsg->prefix_family = AF_INET6;
4543         pmsg->prefix_pad1 = 0;
4544         pmsg->prefix_pad2 = 0;
4545         pmsg->prefix_ifindex = idev->dev->ifindex;
4546         pmsg->prefix_len = pinfo->prefix_len;
4547         pmsg->prefix_type = pinfo->type;
4548         pmsg->prefix_pad3 = 0;
4549         pmsg->prefix_flags = 0;
4550         if (pinfo->onlink)
4551                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4552         if (pinfo->autoconf)
4553                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4554
4555         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4556                 goto nla_put_failure;
4557         ci.preferred_time = ntohl(pinfo->prefered);
4558         ci.valid_time = ntohl(pinfo->valid);
4559         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4560                 goto nla_put_failure;
4561         return nlmsg_end(skb, nlh);
4562
4563 nla_put_failure:
4564         nlmsg_cancel(skb, nlh);
4565         return -EMSGSIZE;
4566 }
4567
4568 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4569                          struct prefix_info *pinfo)
4570 {
4571         struct sk_buff *skb;
4572         struct net *net = dev_net(idev->dev);
4573         int err = -ENOBUFS;
4574
4575         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4576         if (skb == NULL)
4577                 goto errout;
4578
4579         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4580         if (err < 0) {
4581                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4582                 WARN_ON(err == -EMSGSIZE);
4583                 kfree_skb(skb);
4584                 goto errout;
4585         }
4586         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4587         return;
4588 errout:
4589         if (err < 0)
4590                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4591 }
4592
4593 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4594 {
4595         write_lock_bh(&ifp->idev->lock);
4596         spin_lock(&ifp->lock);
4597         if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4598                             IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4599             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4600                 ifp->idev->valid_ll_addr_cnt += count;
4601         WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4602         spin_unlock(&ifp->lock);
4603         write_unlock_bh(&ifp->idev->lock);
4604 }
4605
4606 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4607 {
4608         struct net *net = dev_net(ifp->idev->dev);
4609
4610         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4611
4612         switch (event) {
4613         case RTM_NEWADDR:
4614                 update_valid_ll_addr_cnt(ifp, 1);
4615
4616                 /*
4617                  * If the address was optimistic
4618                  * we inserted the route at the start of
4619                  * our DAD process, so we don't need
4620                  * to do it again
4621                  */
4622                 if (!(ifp->rt->rt6i_node))
4623                         ip6_ins_rt(ifp->rt);
4624                 if (ifp->idev->cnf.forwarding)
4625                         addrconf_join_anycast(ifp);
4626                 if (!ipv6_addr_any(&ifp->peer_addr))
4627                         addrconf_prefix_route(&ifp->peer_addr, 128,
4628                                               ifp->idev->dev, 0, 0);
4629                 break;
4630         case RTM_DELADDR:
4631                 update_valid_ll_addr_cnt(ifp, -1);
4632
4633                 if (ifp->idev->cnf.forwarding)
4634                         addrconf_leave_anycast(ifp);
4635                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4636                 if (!ipv6_addr_any(&ifp->peer_addr)) {
4637                         struct rt6_info *rt;
4638                         struct net_device *dev = ifp->idev->dev;
4639
4640                         rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4641                                         dev->ifindex, 1);
4642                         if (rt) {
4643                                 dst_hold(&rt->dst);
4644                                 if (ip6_del_rt(rt))
4645                                         dst_free(&rt->dst);
4646                         }
4647                 }
4648                 dst_hold(&ifp->rt->dst);
4649
4650                 if (ip6_del_rt(ifp->rt))
4651                         dst_free(&ifp->rt->dst);
4652                 break;
4653         }
4654         atomic_inc(&net->ipv6.dev_addr_genid);
4655 }
4656
4657 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4658 {
4659         rcu_read_lock_bh();
4660         if (likely(ifp->idev->dead == 0))
4661                 __ipv6_ifa_notify(event, ifp);
4662         rcu_read_unlock_bh();
4663 }
4664
4665 #ifdef CONFIG_SYSCTL
4666
4667 static
4668 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4669                            void __user *buffer, size_t *lenp, loff_t *ppos)
4670 {
4671         int *valp = ctl->data;
4672         int val = *valp;
4673         loff_t pos = *ppos;
4674         struct ctl_table lctl;
4675         int ret;
4676
4677         /*
4678          * ctl->data points to idev->cnf.forwarding, we should
4679          * not modify it until we get the rtnl lock.
4680          */
4681         lctl = *ctl;
4682         lctl.data = &val;
4683
4684         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4685
4686         if (write)
4687                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4688         if (ret)
4689                 *ppos = pos;
4690         return ret;
4691 }
4692
4693 static void dev_disable_change(struct inet6_dev *idev)
4694 {
4695         struct netdev_notifier_info info;
4696
4697         if (!idev || !idev->dev)
4698                 return;
4699
4700         netdev_notifier_info_init(&info, idev->dev);
4701         if (idev->cnf.disable_ipv6)
4702                 addrconf_notify(NULL, NETDEV_DOWN, &info);
4703         else
4704                 addrconf_notify(NULL, NETDEV_UP, &info);
4705 }
4706
4707 static void addrconf_disable_change(struct net *net, __s32 newf)
4708 {
4709         struct net_device *dev;
4710         struct inet6_dev *idev;
4711
4712         rcu_read_lock();
4713         for_each_netdev_rcu(net, dev) {
4714                 idev = __in6_dev_get(dev);
4715                 if (idev) {
4716                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4717                         idev->cnf.disable_ipv6 = newf;
4718                         if (changed)
4719                                 dev_disable_change(idev);
4720                 }
4721         }
4722         rcu_read_unlock();
4723 }
4724
4725 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4726 {
4727         struct net *net;
4728         int old;
4729
4730         if (!rtnl_trylock())
4731                 return restart_syscall();
4732
4733         net = (struct net *)table->extra2;
4734         old = *p;
4735         *p = newf;
4736
4737         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4738                 rtnl_unlock();
4739                 return 0;
4740         }
4741
4742         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4743                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4744                 addrconf_disable_change(net, newf);
4745         } else if ((!newf) ^ (!old))
4746                 dev_disable_change((struct inet6_dev *)table->extra1);
4747
4748         rtnl_unlock();
4749         return 0;
4750 }
4751
4752 static
4753 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4754                             void __user *buffer, size_t *lenp, loff_t *ppos)
4755 {
4756         int *valp = ctl->data;
4757         int val = *valp;
4758         loff_t pos = *ppos;
4759         struct ctl_table lctl;
4760         int ret;
4761
4762         /*
4763          * ctl->data points to idev->cnf.disable_ipv6, we should
4764          * not modify it until we get the rtnl lock.
4765          */
4766         lctl = *ctl;
4767         lctl.data = &val;
4768
4769         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4770
4771         if (write)
4772                 ret = addrconf_disable_ipv6(ctl, valp, val);
4773         if (ret)
4774                 *ppos = pos;
4775         return ret;
4776 }
4777
4778 static struct addrconf_sysctl_table
4779 {
4780         struct ctl_table_header *sysctl_header;
4781         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4782 } addrconf_sysctl __read_mostly = {
4783         .sysctl_header = NULL,
4784         .addrconf_vars = {
4785                 {
4786                         .procname       = "forwarding",
4787                         .data           = &ipv6_devconf.forwarding,
4788                         .maxlen         = sizeof(int),
4789                         .mode           = 0644,
4790                         .proc_handler   = addrconf_sysctl_forward,
4791                 },
4792                 {
4793                         .procname       = "hop_limit",
4794                         .data           = &ipv6_devconf.hop_limit,
4795                         .maxlen         = sizeof(int),
4796                         .mode           = 0644,
4797                         .proc_handler   = proc_dointvec,
4798                 },
4799                 {
4800                         .procname       = "mtu",
4801                         .data           = &ipv6_devconf.mtu6,
4802                         .maxlen         = sizeof(int),
4803                         .mode           = 0644,
4804                         .proc_handler   = proc_dointvec,
4805                 },
4806                 {
4807                         .procname       = "accept_ra",
4808                         .data           = &ipv6_devconf.accept_ra,
4809                         .maxlen         = sizeof(int),
4810                         .mode           = 0644,
4811                         .proc_handler   = proc_dointvec,
4812                 },
4813                 {
4814                         .procname       = "accept_redirects",
4815                         .data           = &ipv6_devconf.accept_redirects,
4816                         .maxlen         = sizeof(int),
4817                         .mode           = 0644,
4818                         .proc_handler   = proc_dointvec,
4819                 },
4820                 {
4821                         .procname       = "autoconf",
4822                         .data           = &ipv6_devconf.autoconf,
4823                         .maxlen         = sizeof(int),
4824                         .mode           = 0644,
4825                         .proc_handler   = proc_dointvec,
4826                 },
4827                 {
4828                         .procname       = "dad_transmits",
4829                         .data           = &ipv6_devconf.dad_transmits,
4830                         .maxlen         = sizeof(int),
4831                         .mode           = 0644,
4832                         .proc_handler   = proc_dointvec,
4833                 },
4834                 {
4835                         .procname       = "router_solicitations",
4836                         .data           = &ipv6_devconf.rtr_solicits,
4837                         .maxlen         = sizeof(int),
4838                         .mode           = 0644,
4839                         .proc_handler   = proc_dointvec,
4840                 },
4841                 {
4842                         .procname       = "router_solicitation_interval",
4843                         .data           = &ipv6_devconf.rtr_solicit_interval,
4844                         .maxlen         = sizeof(int),
4845                         .mode           = 0644,
4846                         .proc_handler   = proc_dointvec_jiffies,
4847                 },
4848                 {
4849                         .procname       = "router_solicitation_delay",
4850                         .data           = &ipv6_devconf.rtr_solicit_delay,
4851                         .maxlen         = sizeof(int),
4852                         .mode           = 0644,
4853                         .proc_handler   = proc_dointvec_jiffies,
4854                 },
4855                 {
4856                         .procname       = "force_mld_version",
4857                         .data           = &ipv6_devconf.force_mld_version,
4858                         .maxlen         = sizeof(int),
4859                         .mode           = 0644,
4860                         .proc_handler   = proc_dointvec,
4861                 },
4862 #ifdef CONFIG_IPV6_PRIVACY
4863                 {
4864                         .procname       = "use_tempaddr",
4865                         .data           = &ipv6_devconf.use_tempaddr,
4866                         .maxlen         = sizeof(int),
4867                         .mode           = 0644,
4868                         .proc_handler   = proc_dointvec,
4869                 },
4870                 {
4871                         .procname       = "temp_valid_lft",
4872                         .data           = &ipv6_devconf.temp_valid_lft,
4873                         .maxlen         = sizeof(int),
4874                         .mode           = 0644,
4875                         .proc_handler   = proc_dointvec,
4876                 },
4877                 {
4878                         .procname       = "temp_prefered_lft",
4879                         .data           = &ipv6_devconf.temp_prefered_lft,
4880                         .maxlen         = sizeof(int),
4881                         .mode           = 0644,
4882                         .proc_handler   = proc_dointvec,
4883                 },
4884                 {
4885                         .procname       = "regen_max_retry",
4886                         .data           = &ipv6_devconf.regen_max_retry,
4887                         .maxlen         = sizeof(int),
4888                         .mode           = 0644,
4889                         .proc_handler   = proc_dointvec,
4890                 },
4891                 {
4892                         .procname       = "max_desync_factor",
4893                         .data           = &ipv6_devconf.max_desync_factor,
4894                         .maxlen         = sizeof(int),
4895                         .mode           = 0644,
4896                         .proc_handler   = proc_dointvec,
4897                 },
4898 #endif
4899                 {
4900                         .procname       = "max_addresses",
4901                         .data           = &ipv6_devconf.max_addresses,
4902                         .maxlen         = sizeof(int),
4903                         .mode           = 0644,
4904                         .proc_handler   = proc_dointvec,
4905                 },
4906                 {
4907                         .procname       = "accept_ra_defrtr",
4908                         .data           = &ipv6_devconf.accept_ra_defrtr,
4909                         .maxlen         = sizeof(int),
4910                         .mode           = 0644,
4911                         .proc_handler   = proc_dointvec,
4912                 },
4913                 {
4914                         .procname       = "accept_ra_pinfo",
4915                         .data           = &ipv6_devconf.accept_ra_pinfo,
4916                         .maxlen         = sizeof(int),
4917                         .mode           = 0644,
4918                         .proc_handler   = proc_dointvec,
4919                 },
4920 #ifdef CONFIG_IPV6_ROUTER_PREF
4921                 {
4922                         .procname       = "accept_ra_rtr_pref",
4923                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4924                         .maxlen         = sizeof(int),
4925                         .mode           = 0644,
4926                         .proc_handler   = proc_dointvec,
4927                 },
4928                 {
4929                         .procname       = "router_probe_interval",
4930                         .data           = &ipv6_devconf.rtr_probe_interval,
4931                         .maxlen         = sizeof(int),
4932                         .mode           = 0644,
4933                         .proc_handler   = proc_dointvec_jiffies,
4934                 },
4935 #ifdef CONFIG_IPV6_ROUTE_INFO
4936                 {
4937                         .procname       = "accept_ra_rt_info_max_plen",
4938                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4939                         .maxlen         = sizeof(int),
4940                         .mode           = 0644,
4941                         .proc_handler   = proc_dointvec,
4942                 },
4943 #endif
4944 #endif
4945                 {
4946                         .procname       = "proxy_ndp",
4947                         .data           = &ipv6_devconf.proxy_ndp,
4948                         .maxlen         = sizeof(int),
4949                         .mode           = 0644,
4950                         .proc_handler   = proc_dointvec,
4951                 },
4952                 {
4953                         .procname       = "accept_source_route",
4954                         .data           = &ipv6_devconf.accept_source_route,
4955                         .maxlen         = sizeof(int),
4956                         .mode           = 0644,
4957                         .proc_handler   = proc_dointvec,
4958                 },
4959 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4960                 {
4961                         .procname       = "optimistic_dad",
4962                         .data           = &ipv6_devconf.optimistic_dad,
4963                         .maxlen         = sizeof(int),
4964                         .mode           = 0644,
4965                         .proc_handler   = proc_dointvec,
4966
4967                 },
4968 #endif
4969 #ifdef CONFIG_IPV6_MROUTE
4970                 {
4971                         .procname       = "mc_forwarding",
4972                         .data           = &ipv6_devconf.mc_forwarding,
4973                         .maxlen         = sizeof(int),
4974                         .mode           = 0444,
4975                         .proc_handler   = proc_dointvec,
4976                 },
4977 #endif
4978                 {
4979                         .procname       = "disable_ipv6",
4980                         .data           = &ipv6_devconf.disable_ipv6,
4981                         .maxlen         = sizeof(int),
4982                         .mode           = 0644,
4983                         .proc_handler   = addrconf_sysctl_disable,
4984                 },
4985                 {
4986                         .procname       = "accept_dad",
4987                         .data           = &ipv6_devconf.accept_dad,
4988                         .maxlen         = sizeof(int),
4989                         .mode           = 0644,
4990                         .proc_handler   = proc_dointvec,
4991                 },
4992                 {
4993                         .procname       = "force_tllao",
4994                         .data           = &ipv6_devconf.force_tllao,
4995                         .maxlen         = sizeof(int),
4996                         .mode           = 0644,
4997                         .proc_handler   = proc_dointvec
4998                 },
4999                 {
5000                         .procname       = "ndisc_notify",
5001                         .data           = &ipv6_devconf.ndisc_notify,
5002                         .maxlen         = sizeof(int),
5003                         .mode           = 0644,
5004                         .proc_handler   = proc_dointvec
5005                 },
5006                 {
5007                         /* sentinel */
5008                 }
5009         },
5010 };
5011
5012 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5013                 struct inet6_dev *idev, struct ipv6_devconf *p)
5014 {
5015         int i;
5016         struct addrconf_sysctl_table *t;
5017         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5018
5019         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5020         if (t == NULL)
5021                 goto out;
5022
5023         for (i = 0; t->addrconf_vars[i].data; i++) {
5024                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5025                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5026                 t->addrconf_vars[i].extra2 = net;
5027         }
5028
5029         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5030
5031         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5032         if (t->sysctl_header == NULL)
5033                 goto free;
5034
5035         p->sysctl = t;
5036         return 0;
5037
5038 free:
5039         kfree(t);
5040 out:
5041         return -ENOBUFS;
5042 }
5043
5044 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5045 {
5046         struct addrconf_sysctl_table *t;
5047
5048         if (p->sysctl == NULL)
5049                 return;
5050
5051         t = p->sysctl;
5052         p->sysctl = NULL;
5053         unregister_net_sysctl_table(t->sysctl_header);
5054         kfree(t);
5055 }
5056
5057 static void addrconf_sysctl_register(struct inet6_dev *idev)
5058 {
5059         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5060                               &ndisc_ifinfo_sysctl_change);
5061         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5062                                         idev, &idev->cnf);
5063 }
5064
5065 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5066 {
5067         __addrconf_sysctl_unregister(&idev->cnf);
5068         neigh_sysctl_unregister(idev->nd_parms);
5069 }
5070
5071
5072 #endif
5073
5074 static int __net_init addrconf_init_net(struct net *net)
5075 {
5076         int err = -ENOMEM;
5077         struct ipv6_devconf *all, *dflt;
5078
5079         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5080         if (all == NULL)
5081                 goto err_alloc_all;
5082
5083         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5084         if (dflt == NULL)
5085                 goto err_alloc_dflt;
5086
5087         /* these will be inherited by all namespaces */
5088         dflt->autoconf = ipv6_defaults.autoconf;
5089         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5090
5091         net->ipv6.devconf_all = all;
5092         net->ipv6.devconf_dflt = dflt;
5093
5094 #ifdef CONFIG_SYSCTL
5095         err = __addrconf_sysctl_register(net, "all", NULL, all);
5096         if (err < 0)
5097                 goto err_reg_all;
5098
5099         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5100         if (err < 0)
5101                 goto err_reg_dflt;
5102 #endif
5103         return 0;
5104
5105 #ifdef CONFIG_SYSCTL
5106 err_reg_dflt:
5107         __addrconf_sysctl_unregister(all);
5108 err_reg_all:
5109         kfree(dflt);
5110 #endif
5111 err_alloc_dflt:
5112         kfree(all);
5113 err_alloc_all:
5114         return err;
5115 }
5116
5117 static void __net_exit addrconf_exit_net(struct net *net)
5118 {
5119 #ifdef CONFIG_SYSCTL
5120         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5121         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5122 #endif
5123         if (!net_eq(net, &init_net)) {
5124                 kfree(net->ipv6.devconf_dflt);
5125                 kfree(net->ipv6.devconf_all);
5126         }
5127 }
5128
5129 static struct pernet_operations addrconf_ops = {
5130         .init = addrconf_init_net,
5131         .exit = addrconf_exit_net,
5132 };
5133
5134 static struct rtnl_af_ops inet6_ops = {
5135         .family           = AF_INET6,
5136         .fill_link_af     = inet6_fill_link_af,
5137         .get_link_af_size = inet6_get_link_af_size,
5138         .set_link_af      = inet6_set_link_af,
5139 };
5140
5141 /*
5142  *      Init / cleanup code
5143  */
5144
5145 int __init addrconf_init(void)
5146 {
5147         int i, err;
5148
5149         err = ipv6_addr_label_init();
5150         if (err < 0) {
5151                 pr_crit("%s: cannot initialize default policy table: %d\n",
5152                         __func__, err);
5153                 goto out;
5154         }
5155
5156         err = register_pernet_subsys(&addrconf_ops);
5157         if (err < 0)
5158                 goto out_addrlabel;
5159
5160         /* The addrconf netdev notifier requires that loopback_dev
5161          * has it's ipv6 private information allocated and setup
5162          * before it can bring up and give link-local addresses
5163          * to other devices which are up.
5164          *
5165          * Unfortunately, loopback_dev is not necessarily the first
5166          * entry in the global dev_base list of net devices.  In fact,
5167          * it is likely to be the very last entry on that list.
5168          * So this causes the notifier registry below to try and
5169          * give link-local addresses to all devices besides loopback_dev
5170          * first, then loopback_dev, which cases all the non-loopback_dev
5171          * devices to fail to get a link-local address.
5172          *
5173          * So, as a temporary fix, allocate the ipv6 structure for
5174          * loopback_dev first by hand.
5175          * Longer term, all of the dependencies ipv6 has upon the loopback
5176          * device and it being up should be removed.
5177          */
5178         rtnl_lock();
5179         if (!ipv6_add_dev(init_net.loopback_dev))
5180                 err = -ENOMEM;
5181         rtnl_unlock();
5182         if (err)
5183                 goto errlo;
5184
5185         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5186                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5187
5188         register_netdevice_notifier(&ipv6_dev_notf);
5189
5190         addrconf_verify(0);
5191
5192         err = rtnl_af_register(&inet6_ops);
5193         if (err < 0)
5194                 goto errout_af;
5195
5196         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5197                               NULL);
5198         if (err < 0)
5199                 goto errout;
5200
5201         /* Only the first call to __rtnl_register can fail */
5202         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5203         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5204         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5205                         inet6_dump_ifaddr, NULL);
5206         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5207                         inet6_dump_ifmcaddr, NULL);
5208         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5209                         inet6_dump_ifacaddr, NULL);
5210         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5211                         inet6_netconf_dump_devconf, NULL);
5212
5213         ipv6_addr_label_rtnl_register();
5214
5215         return 0;
5216 errout:
5217         rtnl_af_unregister(&inet6_ops);
5218 errout_af:
5219         unregister_netdevice_notifier(&ipv6_dev_notf);
5220 errlo:
5221         unregister_pernet_subsys(&addrconf_ops);
5222 out_addrlabel:
5223         ipv6_addr_label_cleanup();
5224 out:
5225         return err;
5226 }
5227
5228 void addrconf_cleanup(void)
5229 {
5230         struct net_device *dev;
5231         int i;
5232
5233         unregister_netdevice_notifier(&ipv6_dev_notf);
5234         unregister_pernet_subsys(&addrconf_ops);
5235         ipv6_addr_label_cleanup();
5236
5237         rtnl_lock();
5238
5239         __rtnl_af_unregister(&inet6_ops);
5240
5241         /* clean dev list */
5242         for_each_netdev(&init_net, dev) {
5243                 if (__in6_dev_get(dev) == NULL)
5244                         continue;
5245                 addrconf_ifdown(dev, 1);
5246         }
5247         addrconf_ifdown(init_net.loopback_dev, 2);
5248
5249         /*
5250          *      Check hash table.
5251          */
5252         spin_lock_bh(&addrconf_hash_lock);
5253         for (i = 0; i < IN6_ADDR_HSIZE; i++)
5254                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5255         spin_unlock_bh(&addrconf_hash_lock);
5256
5257         del_timer(&addr_chk_timer);
5258         rtnl_unlock();
5259 }