net/ipv6/route.c

   1 /*
   2  *      Linux INET6 implementation
   3  *      FIB front-end.
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      This program is free software; you can redistribute it and/or
   9  *      modify it under the terms of the GNU General Public License
  10  *      as published by the Free Software Foundation; either version
  11  *      2 of the License, or (at your option) any later version.
  12  */
  13
  14 /*      Changes:
  15  *
  16  *      YOSHIFUJI Hideaki @USAGI
  17  *              reworked default router selection.
  18  *              - respect outgoing interface
  19  *              - select from (probably) reachable routers (i.e.
  20  *              routers in REACHABLE, STALE, DELAY or PROBE states).
  21  *              - always select the same router if it is (probably)
  22  *              reachable.  otherwise, round-robin the list.
  23  *      Ville Nuorvala
  24  *              Fixed routing subtrees.
  25  */
  26
  27 #define pr_fmt(fmt) "IPv6: " fmt
  28
  29 #include <linux/capability.h>
  30 #include <linux/errno.h>
  31 #include <linux/export.h>
  32 #include <linux/types.h>
  33 #include <linux/times.h>
  34 #include <linux/socket.h>
  35 #include <linux/sockios.h>
  36 #include <linux/net.h>
  37 #include <linux/route.h>
  38 #include <linux/netdevice.h>
  39 #include <linux/in6.h>
  40 #include <linux/mroute6.h>
  41 #include <linux/init.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/nsproxy.h>
  46 #include <linux/slab.h>
  47 #include <net/net_namespace.h>
  48 #include <net/snmp.h>
  49 #include <net/ipv6.h>
  50 #include <net/ip6_fib.h>
  51 #include <net/ip6_route.h>
  52 #include <net/ndisc.h>
  53 #include <net/addrconf.h>
  54 #include <net/tcp.h>
  55 #include <linux/rtnetlink.h>
  56 #include <net/dst.h>
  57 #include <net/dst_metadata.h>
  58 #include <net/xfrm.h>
  59 #include <net/netevent.h>
  60 #include <net/netlink.h>
  61 #include <net/nexthop.h>
  62 #include <net/lwtunnel.h>
  63 #include <net/ip_tunnels.h>
  64
  65 #include <asm/uaccess.h>
  66
  67 #ifdef CONFIG_SYSCTL
  68 #include <linux/sysctl.h>
  69 #endif
  70
  71 enum rt6_nud_state {
  72         RT6_NUD_FAIL_HARD = -3,
  73         RT6_NUD_FAIL_PROBE = -2,
  74         RT6_NUD_FAIL_DO_RR = -1,
  75         RT6_NUD_SUCCEED = 1
  76 };
  77
  78 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
  79 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
  80 static unsigned int      ip6_default_advmss(const struct dst_entry *dst);
  81 static unsigned int      ip6_mtu(const struct dst_entry *dst);
  82 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
  83 static void             ip6_dst_destroy(struct dst_entry *);
  84 static void             ip6_dst_ifdown(struct dst_entry *,
  85                                        struct net_device *dev, int how);
  86 static int               ip6_dst_gc(struct dst_ops *ops);
  87
  88 static int              ip6_pkt_discard(struct sk_buff *skb);
  89 static int              ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
  90 static int              ip6_pkt_prohibit(struct sk_buff *skb);
  91 static int              ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
  92 static void             ip6_link_failure(struct sk_buff *skb);
  93 static void             ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
  94                                            struct sk_buff *skb, u32 mtu);
  95 static void             rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
  96                                         struct sk_buff *skb);
  97 static void             rt6_dst_from_metrics_check(struct rt6_info *rt);
  98 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
  99
 100 #ifdef CONFIG_IPV6_ROUTE_INFO
 101 static struct rt6_info *rt6_add_route_info(struct net *net,
 102                                            const struct in6_addr *prefix, int prefixlen,
 103                                            const struct in6_addr *gwaddr, int ifindex,
 104                                            unsigned int pref);
 105 static struct rt6_info *rt6_get_route_info(struct net *net,
 106                                            const struct in6_addr *prefix, int prefixlen,
 107                                            const struct in6_addr *gwaddr, int ifindex);
 108 #endif
 109
 110 struct uncached_list {
 111         spinlock_t              lock;
 112         struct list_head        head;
 113 };
 114
 115 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
 116
 117 static void rt6_uncached_list_add(struct rt6_info *rt)
 118 {
 119         struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
 120
 121         rt->dst.flags |= DST_NOCACHE;
 122         rt->rt6i_uncached_list = ul;
 123
 124         spin_lock_bh(&ul->lock);
 125         list_add_tail(&rt->rt6i_uncached, &ul->head);
 126         spin_unlock_bh(&ul->lock);
 127 }
 128
 129 static void rt6_uncached_list_del(struct rt6_info *rt)
 130 {
 131         if (!list_empty(&rt->rt6i_uncached)) {
 132                 struct uncached_list *ul = rt->rt6i_uncached_list;
 133
 134                 spin_lock_bh(&ul->lock);
 135                 list_del(&rt->rt6i_uncached);
 136                 spin_unlock_bh(&ul->lock);
 137         }
 138 }
 139
 140 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
 141 {
 142         struct net_device *loopback_dev = net->loopback_dev;
 143         int cpu;
 144
 145         for_each_possible_cpu(cpu) {
 146                 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
 147                 struct rt6_info *rt;
 148
 149                 spin_lock_bh(&ul->lock);
 150                 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
 151                         struct inet6_dev *rt_idev = rt->rt6i_idev;
 152                         struct net_device *rt_dev = rt->dst.dev;
 153
 154                         if (rt_idev && (rt_idev->dev == dev || !dev) &&
 155                             rt_idev->dev != loopback_dev) {
 156                                 rt->rt6i_idev = in6_dev_get(loopback_dev);
 157                                 in6_dev_put(rt_idev);
 158                         }
 159
 160                         if (rt_dev && (rt_dev == dev || !dev) &&
 161                             rt_dev != loopback_dev) {
 162                                 rt->dst.dev = loopback_dev;
 163                                 dev_hold(rt->dst.dev);
 164                                 dev_put(rt_dev);
 165                         }
 166                 }
 167                 spin_unlock_bh(&ul->lock);
 168         }
 169 }
 170
 171 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
 172 {
 173         return dst_metrics_write_ptr(rt->dst.from);
 174 }
 175
 176 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
 177 {
 178         struct rt6_info *rt = (struct rt6_info *)dst;
 179
 180         if (rt->rt6i_flags & RTF_PCPU)
 181                 return rt6_pcpu_cow_metrics(rt);
 182         else if (rt->rt6i_flags & RTF_CACHE)
 183                 return NULL;
 184         else
 185                 return dst_cow_metrics_generic(dst, old);
 186 }
 187
 188 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
 189                                              struct sk_buff *skb,
 190                                              const void *daddr)
 191 {
 192         struct in6_addr *p = &rt->rt6i_gateway;
 193
 194         if (!ipv6_addr_any(p))
 195                 return (const void *) p;
 196         else if (skb)
 197                 return &ipv6_hdr(skb)->daddr;
 198         return daddr;
 199 }
 200
 201 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
 202                                           struct sk_buff *skb,
 203                                           const void *daddr)
 204 {
 205         struct rt6_info *rt = (struct rt6_info *) dst;
 206         struct neighbour *n;
 207
 208         daddr = choose_neigh_daddr(rt, skb, daddr);
 209         n = __ipv6_neigh_lookup(dst->dev, daddr);
 210         if (n)
 211                 return n;
 212         return neigh_create(&nd_tbl, daddr, dst->dev);
 213 }
 214
 215 static struct dst_ops ip6_dst_ops_template = {
 216         .family                 =       AF_INET6,
 217         .gc                     =       ip6_dst_gc,
 218         .gc_thresh              =       1024,
 219         .check                  =       ip6_dst_check,
 220         .default_advmss         =       ip6_default_advmss,
 221         .mtu                    =       ip6_mtu,
 222         .cow_metrics            =       ipv6_cow_metrics,
 223         .destroy                =       ip6_dst_destroy,
 224         .ifdown                 =       ip6_dst_ifdown,
 225         .negative_advice        =       ip6_negative_advice,
 226         .link_failure           =       ip6_link_failure,
 227         .update_pmtu            =       ip6_rt_update_pmtu,
 228         .redirect               =       rt6_do_redirect,
 229         .local_out              =       __ip6_local_out,
 230         .neigh_lookup           =       ip6_neigh_lookup,
 231 };
 232
 233 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
 234 {
 235         unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
 236
 237         return mtu ? : dst->dev->mtu;
 238 }
 239
 240 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
 241                                          struct sk_buff *skb, u32 mtu)
 242 {
 243 }
 244
 245 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
 246                                       struct sk_buff *skb)
 247 {
 248 }
 249
 250 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
 251                                          unsigned long old)
 252 {
 253         return NULL;
 254 }
 255
 256 static struct dst_ops ip6_dst_blackhole_ops = {
 257         .family                 =       AF_INET6,
 258         .destroy                =       ip6_dst_destroy,
 259         .check                  =       ip6_dst_check,
 260         .mtu                    =       ip6_blackhole_mtu,
 261         .default_advmss         =       ip6_default_advmss,
 262         .update_pmtu            =       ip6_rt_blackhole_update_pmtu,
 263         .redirect               =       ip6_rt_blackhole_redirect,
 264         .cow_metrics            =       ip6_rt_blackhole_cow_metrics,
 265         .neigh_lookup           =       ip6_neigh_lookup,
 266 };
 267
 268 static const u32 ip6_template_metrics[RTAX_MAX] = {
 269         [RTAX_HOPLIMIT - 1] = 0,
 270 };
 271
 272 static const struct rt6_info ip6_null_entry_template = {
 273         .dst = {
 274                 .__refcnt       = ATOMIC_INIT(1),
 275                 .__use          = 1,
 276                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 277                 .error          = -ENETUNREACH,
 278                 .input          = ip6_pkt_discard,
 279                 .output         = ip6_pkt_discard_out,
 280         },
 281         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 282         .rt6i_protocol  = RTPROT_KERNEL,
 283         .rt6i_metric    = ~(u32) 0,
 284         .rt6i_ref       = ATOMIC_INIT(1),
 285 };
 286
 287 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 288
 289 static const struct rt6_info ip6_prohibit_entry_template = {
 290         .dst = {
 291                 .__refcnt       = ATOMIC_INIT(1),
 292                 .__use          = 1,
 293                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 294                 .error          = -EACCES,
 295                 .input          = ip6_pkt_prohibit,
 296                 .output         = ip6_pkt_prohibit_out,
 297         },
 298         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 299         .rt6i_protocol  = RTPROT_KERNEL,
 300         .rt6i_metric    = ~(u32) 0,
 301         .rt6i_ref       = ATOMIC_INIT(1),
 302 };
 303
 304 static const struct rt6_info ip6_blk_hole_entry_template = {
 305         .dst = {
 306                 .__refcnt       = ATOMIC_INIT(1),
 307                 .__use          = 1,
 308                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 309                 .error          = -EINVAL,
 310                 .input          = dst_discard,
 311                 .output         = dst_discard_sk,
 312         },
 313         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 314         .rt6i_protocol  = RTPROT_KERNEL,
 315         .rt6i_metric    = ~(u32) 0,
 316         .rt6i_ref       = ATOMIC_INIT(1),
 317 };
 318
 319 #endif
 320
 321 /* allocate dst with ip6_dst_ops */
 322 static struct rt6_info *__ip6_dst_alloc(struct net *net,
 323                                         struct net_device *dev,
 324                                         int flags)
 325 {
 326         struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
 327                                         0, DST_OBSOLETE_FORCE_CHK, flags);
 328
 329         if (rt) {
 330                 struct dst_entry *dst = &rt->dst;
 331
 332                 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
 333                 INIT_LIST_HEAD(&rt->rt6i_siblings);
 334                 INIT_LIST_HEAD(&rt->rt6i_uncached);
 335         }
 336         return rt;
 337 }
 338
 339 static struct rt6_info *ip6_dst_alloc(struct net *net,
 340                                       struct net_device *dev,
 341                                       int flags)
 342 {
 343         struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
 344
 345         if (rt) {
 346                 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
 347                 if (rt->rt6i_pcpu) {
 348                         int cpu;
 349
 350                         for_each_possible_cpu(cpu) {
 351                                 struct rt6_info **p;
 352
 353                                 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
 354                                 /* no one shares rt */
 355                                 *p =  NULL;
 356                         }
 357                 } else {
 358                         dst_destroy((struct dst_entry *)rt);
 359                         return NULL;
 360                 }
 361         }
 362
 363         return rt;
 364 }
 365
 366 static void ip6_dst_destroy(struct dst_entry *dst)
 367 {
 368         struct rt6_info *rt = (struct rt6_info *)dst;
 369         struct dst_entry *from = dst->from;
 370         struct inet6_dev *idev;
 371
 372         dst_destroy_metrics_generic(dst);
 373         free_percpu(rt->rt6i_pcpu);
 374         rt6_uncached_list_del(rt);
 375
 376         idev = rt->rt6i_idev;
 377         if (idev) {
 378                 rt->rt6i_idev = NULL;
 379                 in6_dev_put(idev);
 380         }
 381
 382         dst->from = NULL;
 383         dst_release(from);
 384 }
 385
 386 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 387                            int how)
 388 {
 389         struct rt6_info *rt = (struct rt6_info *)dst;
 390         struct inet6_dev *idev = rt->rt6i_idev;
 391         struct net_device *loopback_dev =
 392                 dev_net(dev)->loopback_dev;
 393
 394         if (dev != loopback_dev) {
 395                 if (idev && idev->dev == dev) {
 396                         struct inet6_dev *loopback_idev =
 397                                 in6_dev_get(loopback_dev);
 398                         if (loopback_idev) {
 399                                 rt->rt6i_idev = loopback_idev;
 400                                 in6_dev_put(idev);
 401                         }
 402                 }
 403         }
 404 }
 405
 406 static bool rt6_check_expired(const struct rt6_info *rt)
 407 {
 408         if (rt->rt6i_flags & RTF_EXPIRES) {
 409                 if (time_after(jiffies, rt->dst.expires))
 410                         return true;
 411         } else if (rt->dst.from) {
 412                 return rt6_check_expired((struct rt6_info *) rt->dst.from);
 413         }
 414         return false;
 415 }
 416
 417 /* Multipath route selection:
 418  *   Hash based function using packet header and flowlabel.
 419  * Adapted from fib_info_hashfn()
 420  */
 421 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
 422                                const struct flowi6 *fl6)
 423 {
 424         return get_hash_from_flowi6(fl6) % candidate_count;
 425 }
 426
 427 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
 428                                              struct flowi6 *fl6, int oif,
 429                                              int strict)
 430 {
 431         struct rt6_info *sibling, *next_sibling;
 432         int route_choosen;
 433
 434         route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
 435         /* Don't change the route, if route_choosen == 0
 436          * (siblings does not include ourself)
 437          */
 438         if (route_choosen)
 439                 list_for_each_entry_safe(sibling, next_sibling,
 440                                 &match->rt6i_siblings, rt6i_siblings) {
 441                         route_choosen--;
 442                         if (route_choosen == 0) {
 443                                 if (rt6_score_route(sibling, oif, strict) < 0)
 444                                         break;
 445                                 match = sibling;
 446                                 break;
 447                         }
 448                 }
 449         return match;
 450 }
 451
 452 /*
 453  *      Route lookup. Any table->tb6_lock is implied.
 454  */
 455
 456 static inline struct rt6_info *rt6_device_match(struct net *net,
 457                                                     struct rt6_info *rt,
 458                                                     const struct in6_addr *saddr,
 459                                                     int oif,
 460                                                     int flags)
 461 {
 462         struct rt6_info *local = NULL;
 463         struct rt6_info *sprt;
 464
 465         if (!oif && ipv6_addr_any(saddr))
 466                 goto out;
 467
 468         for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
 469                 struct net_device *dev = sprt->dst.dev;
 470
 471                 if (oif) {
 472                         if (dev->ifindex == oif)
 473                                 return sprt;
 474                         if (dev->flags & IFF_LOOPBACK) {
 475                                 if (!sprt->rt6i_idev ||
 476                                     sprt->rt6i_idev->dev->ifindex != oif) {
 477                                         if (flags & RT6_LOOKUP_F_IFACE)
 478                                                 continue;
 479                                         if (local &&
 480                                             local->rt6i_idev->dev->ifindex == oif)
 481                                                 continue;
 482                                 }
 483                                 local = sprt;
 484                         }
 485                 } else {
 486                         if (ipv6_chk_addr(net, saddr, dev,
 487                                           flags & RT6_LOOKUP_F_IFACE))
 488                                 return sprt;
 489                 }
 490         }
 491
 492         if (oif) {
 493                 if (local)
 494                         return local;
 495
 496                 if (flags & RT6_LOOKUP_F_IFACE)
 497                         return net->ipv6.ip6_null_entry;
 498         }
 499 out:
 500         return rt;
 501 }
 502
 503 #ifdef CONFIG_IPV6_ROUTER_PREF
 504 struct __rt6_probe_work {
 505         struct work_struct work;
 506         struct in6_addr target;
 507         struct net_device *dev;
 508 };
 509
 510 static void rt6_probe_deferred(struct work_struct *w)
 511 {
 512         struct in6_addr mcaddr;
 513         struct __rt6_probe_work *work =
 514                 container_of(w, struct __rt6_probe_work, work);
 515
 516         addrconf_addr_solict_mult(&work->target, &mcaddr);
 517         ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, NULL);
 518         dev_put(work->dev);
 519         kfree(work);
 520 }
 521
 522 static void rt6_probe(struct rt6_info *rt)
 523 {
 524         struct __rt6_probe_work *work;
 525         struct neighbour *neigh;
 526         /*
 527          * Okay, this does not seem to be appropriate
 528          * for now, however, we need to check if it
 529          * is really so; aka Router Reachability Probing.
 530          *
 531          * Router Reachability Probe MUST be rate-limited
 532          * to no more than one per minute.
 533          */
 534         if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
 535                 return;
 536         rcu_read_lock_bh();
 537         neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
 538         if (neigh) {
 539                 if (neigh->nud_state & NUD_VALID)
 540                         goto out;
 541
 542                 work = NULL;
 543                 write_lock(&neigh->lock);
 544                 if (!(neigh->nud_state & NUD_VALID) &&
 545                     time_after(jiffies,
 546                                neigh->updated +
 547                                rt->rt6i_idev->cnf.rtr_probe_interval)) {
 548                         work = kmalloc(sizeof(*work), GFP_ATOMIC);
 549                         if (work)
 550                                 __neigh_set_probe_once(neigh);
 551                 }
 552                 write_unlock(&neigh->lock);
 553         } else {
 554                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 555         }
 556
 557         if (work) {
 558                 INIT_WORK(&work->work, rt6_probe_deferred);
 559                 work->target = rt->rt6i_gateway;
 560                 dev_hold(rt->dst.dev);
 561                 work->dev = rt->dst.dev;
 562                 schedule_work(&work->work);
 563         }
 564
 565 out:
 566         rcu_read_unlock_bh();
 567 }
 568 #else
 569 static inline void rt6_probe(struct rt6_info *rt)
 570 {
 571 }
 572 #endif
 573
 574 /*
 575  * Default Router Selection (RFC 2461 6.3.6)
 576  */
 577 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
 578 {
 579         struct net_device *dev = rt->dst.dev;
 580         if (!oif || dev->ifindex == oif)
 581                 return 2;
 582         if ((dev->flags & IFF_LOOPBACK) &&
 583             rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
 584                 return 1;
 585         return 0;
 586 }
 587
 588 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
 589 {
 590         struct neighbour *neigh;
 591         enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
 592
 593         if (rt->rt6i_flags & RTF_NONEXTHOP ||
 594             !(rt->rt6i_flags & RTF_GATEWAY))
 595                 return RT6_NUD_SUCCEED;
 596
 597         rcu_read_lock_bh();
 598         neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
 599         if (neigh) {
 600                 read_lock(&neigh->lock);
 601                 if (neigh->nud_state & NUD_VALID)
 602                         ret = RT6_NUD_SUCCEED;
 603 #ifdef CONFIG_IPV6_ROUTER_PREF
 604                 else if (!(neigh->nud_state & NUD_FAILED))
 605                         ret = RT6_NUD_SUCCEED;
 606                 else
 607                         ret = RT6_NUD_FAIL_PROBE;
 608 #endif
 609                 read_unlock(&neigh->lock);
 610         } else {
 611                 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
 612                       RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
 613         }
 614         rcu_read_unlock_bh();
 615
 616         return ret;
 617 }
 618
 619 static int rt6_score_route(struct rt6_info *rt, int oif,
 620                            int strict)
 621 {
 622         int m;
 623
 624         m = rt6_check_dev(rt, oif);
 625         if (!m && (strict & RT6_LOOKUP_F_IFACE))
 626                 return RT6_NUD_FAIL_HARD;
 627 #ifdef CONFIG_IPV6_ROUTER_PREF
 628         m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
 629 #endif
 630         if (strict & RT6_LOOKUP_F_REACHABLE) {
 631                 int n = rt6_check_neigh(rt);
 632                 if (n < 0)
 633                         return n;
 634         }
 635         return m;
 636 }
 637
 638 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
 639                                    int *mpri, struct rt6_info *match,
 640                                    bool *do_rr)
 641 {
 642         int m;
 643         bool match_do_rr = false;
 644         struct inet6_dev *idev = rt->rt6i_idev;
 645         struct net_device *dev = rt->dst.dev;
 646
 647         if (dev && !netif_carrier_ok(dev) &&
 648             idev->cnf.ignore_routes_with_linkdown)
 649                 goto out;
 650
 651         if (rt6_check_expired(rt))
 652                 goto out;
 653
 654         m = rt6_score_route(rt, oif, strict);
 655         if (m == RT6_NUD_FAIL_DO_RR) {
 656                 match_do_rr = true;
 657                 m = 0; /* lowest valid score */
 658         } else if (m == RT6_NUD_FAIL_HARD) {
 659                 goto out;
 660         }
 661
 662         if (strict & RT6_LOOKUP_F_REACHABLE)
 663                 rt6_probe(rt);
 664
 665         /* note that m can be RT6_NUD_FAIL_PROBE at this point */
 666         if (m > *mpri) {
 667                 *do_rr = match_do_rr;
 668                 *mpri = m;
 669                 match = rt;
 670         }
 671 out:
 672         return match;
 673 }
 674
 675 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
 676                                      struct rt6_info *rr_head,
 677                                      u32 metric, int oif, int strict,
 678                                      bool *do_rr)
 679 {
 680         struct rt6_info *rt, *match, *cont;
 681         int mpri = -1;
 682
 683         match = NULL;
 684         cont = NULL;
 685         for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
 686                 if (rt->rt6i_metric != metric) {
 687                         cont = rt;
 688                         break;
 689                 }
 690
 691                 match = find_match(rt, oif, strict, &mpri, match, do_rr);
 692         }
 693
 694         for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
 695                 if (rt->rt6i_metric != metric) {
 696                         cont = rt;
 697                         break;
 698                 }
 699
 700                 match = find_match(rt, oif, strict, &mpri, match, do_rr);
 701         }
 702
 703         if (match || !cont)
 704                 return match;
 705
 706         for (rt = cont; rt; rt = rt->dst.rt6_next)
 707                 match = find_match(rt, oif, strict, &mpri, match, do_rr);
 708
 709         return match;
 710 }
 711
 712 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
 713 {
 714         struct rt6_info *match, *rt0;
 715         struct net *net;
 716         bool do_rr = false;
 717
 718         rt0 = fn->rr_ptr;
 719         if (!rt0)
 720                 fn->rr_ptr = rt0 = fn->leaf;
 721
 722         match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
 723                              &do_rr);
 724
 725         if (do_rr) {
 726                 struct rt6_info *next = rt0->dst.rt6_next;
 727
 728                 /* no entries matched; do round-robin */
 729                 if (!next || next->rt6i_metric != rt0->rt6i_metric)
 730                         next = fn->leaf;
 731
 732                 if (next != rt0)
 733                         fn->rr_ptr = next;
 734         }
 735
 736         net = dev_net(rt0->dst.dev);
 737         return match ? match : net->ipv6.ip6_null_entry;
 738 }
 739
 740 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
 741 {
 742         return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
 743 }
 744
 745 #ifdef CONFIG_IPV6_ROUTE_INFO
 746 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 747                   const struct in6_addr *gwaddr)
 748 {
 749         struct net *net = dev_net(dev);
 750         struct route_info *rinfo = (struct route_info *) opt;
 751         struct in6_addr prefix_buf, *prefix;
 752         unsigned int pref;
 753         unsigned long lifetime;
 754         struct rt6_info *rt;
 755
 756         if (len < sizeof(struct route_info)) {
 757                 return -EINVAL;
 758         }
 759
 760         /* Sanity check for prefix_len and length */
 761         if (rinfo->length > 3) {
 762                 return -EINVAL;
 763         } else if (rinfo->prefix_len > 128) {
 764                 return -EINVAL;
 765         } else if (rinfo->prefix_len > 64) {
 766                 if (rinfo->length < 2) {
 767                         return -EINVAL;
 768                 }
 769         } else if (rinfo->prefix_len > 0) {
 770                 if (rinfo->length < 1) {
 771                         return -EINVAL;
 772                 }
 773         }
 774
 775         pref = rinfo->route_pref;
 776         if (pref == ICMPV6_ROUTER_PREF_INVALID)
 777                 return -EINVAL;
 778
 779         lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
 780
 781         if (rinfo->length == 3)
 782                 prefix = (struct in6_addr *)rinfo->prefix;
 783         else {
 784                 /* this function is safe */
 785                 ipv6_addr_prefix(&prefix_buf,
 786                                  (struct in6_addr *)rinfo->prefix,
 787                                  rinfo->prefix_len);
 788                 prefix = &prefix_buf;
 789         }
 790
 791         if (rinfo->prefix_len == 0)
 792                 rt = rt6_get_dflt_router(gwaddr, dev);
 793         else
 794                 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
 795                                         gwaddr, dev->ifindex);
 796
 797         if (rt && !lifetime) {
 798                 ip6_del_rt(rt);
 799                 rt = NULL;
 800         }
 801
 802         if (!rt && lifetime)
 803                 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
 804                                         pref);
 805         else if (rt)
 806                 rt->rt6i_flags = RTF_ROUTEINFO |
 807                                  (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
 808
 809         if (rt) {
 810                 if (!addrconf_finite_timeout(lifetime))
 811                         rt6_clean_expires(rt);
 812                 else
 813                         rt6_set_expires(rt, jiffies + HZ * lifetime);
 814
 815                 ip6_rt_put(rt);
 816         }
 817         return 0;
 818 }
 819 #endif
 820
 821 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
 822                                         struct in6_addr *saddr)
 823 {
 824         struct fib6_node *pn;
 825         while (1) {
 826                 if (fn->fn_flags & RTN_TL_ROOT)
 827                         return NULL;
 828                 pn = fn->parent;
 829                 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
 830                         fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
 831                 else
 832                         fn = pn;
 833                 if (fn->fn_flags & RTN_RTINFO)
 834                         return fn;
 835         }
 836 }
 837
 838 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 839                                              struct fib6_table *table,
 840                                              struct flowi6 *fl6, int flags)
 841 {
 842         struct fib6_node *fn;
 843         struct rt6_info *rt;
 844
 845         read_lock_bh(&table->tb6_lock);
 846         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 847 restart:
 848         rt = fn->leaf;
 849         rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
 850         if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
 851                 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
 852         if (rt == net->ipv6.ip6_null_entry) {
 853                 fn = fib6_backtrack(fn, &fl6->saddr);
 854                 if (fn)
 855                         goto restart;
 856         }
 857         dst_use(&rt->dst, jiffies);
 858         read_unlock_bh(&table->tb6_lock);
 859         return rt;
 860
 861 }
 862
 863 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
 864                                     int flags)
 865 {
 866         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
 867 }
 868 EXPORT_SYMBOL_GPL(ip6_route_lookup);
 869
 870 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
 871                             const struct in6_addr *saddr, int oif, int strict)
 872 {
 873         struct flowi6 fl6 = {
 874                 .flowi6_oif = oif,
 875                 .daddr = *daddr,
 876         };
 877         struct dst_entry *dst;
 878         int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
 879
 880         if (saddr) {
 881                 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
 882                 flags |= RT6_LOOKUP_F_HAS_SADDR;
 883         }
 884
 885         dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
 886         if (dst->error == 0)
 887                 return (struct rt6_info *) dst;
 888
 889         dst_release(dst);
 890
 891         return NULL;
 892 }
 893 EXPORT_SYMBOL(rt6_lookup);
 894
 895 /* ip6_ins_rt is called with FREE table->tb6_lock.
 896    It takes new route entry, the addition fails by any reason the
 897    route is freed. In any case, if caller does not hold it, it may
 898    be destroyed.
 899  */
 900
 901 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
 902                         struct mx6_config *mxc)
 903 {
 904         int err;
 905         struct fib6_table *table;
 906
 907         table = rt->rt6i_table;
 908         write_lock_bh(&table->tb6_lock);
 909         err = fib6_add(&table->tb6_root, rt, info, mxc);
 910         write_unlock_bh(&table->tb6_lock);
 911
 912         return err;
 913 }
 914
 915 int ip6_ins_rt(struct rt6_info *rt)
 916 {
 917         struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
 918         struct mx6_config mxc = { .mx = NULL, };
 919
 920         return __ip6_ins_rt(rt, &info, &mxc);
 921 }
 922
 923 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
 924                                            const struct in6_addr *daddr,
 925                                            const struct in6_addr *saddr)
 926 {
 927         struct rt6_info *rt;
 928
 929         /*
 930          *      Clone the route.
 931          */
 932
 933         if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
 934                 ort = (struct rt6_info *)ort->dst.from;
 935
 936         rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
 937
 938         if (!rt)
 939                 return NULL;
 940
 941         ip6_rt_copy_init(rt, ort);
 942         rt->rt6i_flags |= RTF_CACHE;
 943         rt->rt6i_metric = 0;
 944         rt->dst.flags |= DST_HOST;
 945         rt->rt6i_dst.addr = *daddr;
 946         rt->rt6i_dst.plen = 128;
 947
 948         if (!rt6_is_gw_or_nonexthop(ort)) {
 949                 if (ort->rt6i_dst.plen != 128 &&
 950                     ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
 951                         rt->rt6i_flags |= RTF_ANYCAST;
 952 #ifdef CONFIG_IPV6_SUBTREES
 953                 if (rt->rt6i_src.plen && saddr) {
 954                         rt->rt6i_src.addr = *saddr;
 955                         rt->rt6i_src.plen = 128;
 956                 }
 957 #endif
 958         }
 959
 960         return rt;
 961 }
 962
 963 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
 964 {
 965         struct rt6_info *pcpu_rt;
 966
 967         pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
 968                                   rt->dst.dev, rt->dst.flags);
 969
 970         if (!pcpu_rt)
 971                 return NULL;
 972         ip6_rt_copy_init(pcpu_rt, rt);
 973         pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
 974         pcpu_rt->rt6i_flags |= RTF_PCPU;
 975         return pcpu_rt;
 976 }
 977
 978 /* It should be called with read_lock_bh(&tb6_lock) acquired */
 979 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
 980 {
 981         struct rt6_info *pcpu_rt, **p;
 982
 983         p = this_cpu_ptr(rt->rt6i_pcpu);
 984         pcpu_rt = *p;
 985
 986         if (pcpu_rt) {
 987                 dst_hold(&pcpu_rt->dst);
 988                 rt6_dst_from_metrics_check(pcpu_rt);
 989         }
 990         return pcpu_rt;
 991 }
 992
 993 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
 994 {
 995         struct fib6_table *table = rt->rt6i_table;
 996         struct rt6_info *pcpu_rt, *prev, **p;
 997
 998         pcpu_rt = ip6_rt_pcpu_alloc(rt);
 999         if (!pcpu_rt) {
1000                 struct net *net = dev_net(rt->dst.dev);
1001
1002                 dst_hold(&net->ipv6.ip6_null_entry->dst);
1003                 return net->ipv6.ip6_null_entry;
1004         }
1005
1006         read_lock_bh(&table->tb6_lock);
1007         if (rt->rt6i_pcpu) {
1008                 p = this_cpu_ptr(rt->rt6i_pcpu);
1009                 prev = cmpxchg(p, NULL, pcpu_rt);
1010                 if (prev) {
1011                         /* If someone did it before us, return prev instead */
1012                         dst_destroy(&pcpu_rt->dst);
1013                         pcpu_rt = prev;
1014                 }
1015         } else {
1016                 /* rt has been removed from the fib6 tree
1017                  * before we have a chance to acquire the read_lock.
1018                  * In this case, don't brother to create a pcpu rt
1019                  * since rt is going away anyway.  The next
1020                  * dst_check() will trigger a re-lookup.
1021                  */
1022                 dst_destroy(&pcpu_rt->dst);
1023                 pcpu_rt = rt;
1024         }
1025         dst_hold(&pcpu_rt->dst);
1026         rt6_dst_from_metrics_check(pcpu_rt);
1027         read_unlock_bh(&table->tb6_lock);
1028         return pcpu_rt;
1029 }
1030
1031 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1032                                       struct flowi6 *fl6, int flags)
1033 {
1034         struct fib6_node *fn, *saved_fn;
1035         struct rt6_info *rt;
1036         int strict = 0;
1037
1038         strict |= flags & RT6_LOOKUP_F_IFACE;
1039         if (net->ipv6.devconf_all->forwarding == 0)
1040                 strict |= RT6_LOOKUP_F_REACHABLE;
1041
1042         read_lock_bh(&table->tb6_lock);
1043
1044         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1045         saved_fn = fn;
1046
1047 redo_rt6_select:
1048         rt = rt6_select(fn, oif, strict);
1049         if (rt->rt6i_nsiblings)
1050                 rt = rt6_multipath_select(rt, fl6, oif, strict);
1051         if (rt == net->ipv6.ip6_null_entry) {
1052                 fn = fib6_backtrack(fn, &fl6->saddr);
1053                 if (fn)
1054                         goto redo_rt6_select;
1055                 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1056                         /* also consider unreachable route */
1057                         strict &= ~RT6_LOOKUP_F_REACHABLE;
1058                         fn = saved_fn;
1059                         goto redo_rt6_select;
1060                 }
1061         }
1062
1063
1064         if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1065                 dst_use(&rt->dst, jiffies);
1066                 read_unlock_bh(&table->tb6_lock);
1067
1068                 rt6_dst_from_metrics_check(rt);
1069                 return rt;
1070         } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1071                             !(rt->rt6i_flags & RTF_GATEWAY))) {
1072                 /* Create a RTF_CACHE clone which will not be
1073                  * owned by the fib6 tree.  It is for the special case where
1074                  * the daddr in the skb during the neighbor look-up is different
1075                  * from the fl6->daddr used to look-up route here.
1076                  */
1077
1078                 struct rt6_info *uncached_rt;
1079
1080                 dst_use(&rt->dst, jiffies);
1081                 read_unlock_bh(&table->tb6_lock);
1082
1083                 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1084                 dst_release(&rt->dst);
1085
1086                 if (uncached_rt)
1087                         rt6_uncached_list_add(uncached_rt);
1088                 else
1089                         uncached_rt = net->ipv6.ip6_null_entry;
1090
1091                 dst_hold(&uncached_rt->dst);
1092                 return uncached_rt;
1093
1094         } else {
1095                 /* Get a percpu copy */
1096
1097                 struct rt6_info *pcpu_rt;
1098
1099                 rt->dst.lastuse = jiffies;
1100                 rt->dst.__use++;
1101                 pcpu_rt = rt6_get_pcpu_route(rt);
1102
1103                 if (pcpu_rt) {
1104                         read_unlock_bh(&table->tb6_lock);
1105                 } else {
1106                         /* We have to do the read_unlock first
1107                          * because rt6_make_pcpu_route() may trigger
1108                          * ip6_dst_gc() which will take the write_lock.
1109                          */
1110                         dst_hold(&rt->dst);
1111                         read_unlock_bh(&table->tb6_lock);
1112                         pcpu_rt = rt6_make_pcpu_route(rt);
1113                         dst_release(&rt->dst);
1114                 }
1115
1116                 return pcpu_rt;
1117
1118         }
1119 }
1120
1121 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1122                                             struct flowi6 *fl6, int flags)
1123 {
1124         return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1125 }
1126
1127 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1128                                                 struct net_device *dev,
1129                                                 struct flowi6 *fl6, int flags)
1130 {
1131         if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1132                 flags |= RT6_LOOKUP_F_IFACE;
1133
1134         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1135 }
1136
1137 void ip6_route_input(struct sk_buff *skb)
1138 {
1139         const struct ipv6hdr *iph = ipv6_hdr(skb);
1140         struct net *net = dev_net(skb->dev);
1141         int flags = RT6_LOOKUP_F_HAS_SADDR;
1142         struct ip_tunnel_info *tun_info;
1143         struct flowi6 fl6 = {
1144                 .flowi6_iif = skb->dev->ifindex,
1145                 .daddr = iph->daddr,
1146                 .saddr = iph->saddr,
1147                 .flowlabel = ip6_flowinfo(iph),
1148                 .flowi6_mark = skb->mark,
1149                 .flowi6_proto = iph->nexthdr,
1150         };
1151
1152         tun_info = skb_tunnel_info(skb);
1153         if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1154                 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1155         skb_dst_drop(skb);
1156         skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1157 }
1158
1159 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1160                                              struct flowi6 *fl6, int flags)
1161 {
1162         return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1163 }
1164
1165 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
1166                                     struct flowi6 *fl6)
1167 {
1168         int flags = 0;
1169
1170         fl6->flowi6_iif = LOOPBACK_IFINDEX;
1171
1172         if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1173             fl6->flowi6_oif)
1174                 flags |= RT6_LOOKUP_F_IFACE;
1175
1176         if (!ipv6_addr_any(&fl6->saddr))
1177                 flags |= RT6_LOOKUP_F_HAS_SADDR;
1178         else if (sk)
1179                 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1180
1181         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1182 }
1183 EXPORT_SYMBOL(ip6_route_output);
1184
1185 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1186 {
1187         struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1188         struct dst_entry *new = NULL;
1189
1190         rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1191         if (rt) {
1192                 new = &rt->dst;
1193
1194                 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1195
1196                 new->__use = 1;
1197                 new->input = dst_discard;
1198                 new->output = dst_discard_sk;
1199
1200                 if (dst_metrics_read_only(&ort->dst))
1201                         new->_metrics = ort->dst._metrics;
1202                 else
1203                         dst_copy_metrics(new, &ort->dst);
1204                 rt->rt6i_idev = ort->rt6i_idev;
1205                 if (rt->rt6i_idev)
1206                         in6_dev_hold(rt->rt6i_idev);
1207
1208                 rt->rt6i_gateway = ort->rt6i_gateway;
1209                 rt->rt6i_flags = ort->rt6i_flags;
1210                 rt->rt6i_metric = 0;
1211
1212                 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1213 #ifdef CONFIG_IPV6_SUBTREES
1214                 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1215 #endif
1216
1217                 dst_free(new);
1218         }
1219
1220         dst_release(dst_orig);
1221         return new ? new : ERR_PTR(-ENOMEM);
1222 }
1223
1224 /*
1225  *      Destination cache support functions
1226  */
1227
1228 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1229 {
1230         if (rt->dst.from &&
1231             dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1232                 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1233 }
1234
1235 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1236 {
1237         if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1238                 return NULL;
1239
1240         if (rt6_check_expired(rt))
1241                 return NULL;
1242
1243         return &rt->dst;
1244 }
1245
1246 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1247 {
1248         if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1249             rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1250                 return &rt->dst;
1251         else
1252                 return NULL;
1253 }
1254
1255 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1256 {
1257         struct rt6_info *rt;
1258
1259         rt = (struct rt6_info *) dst;
1260
1261         /* All IPV6 dsts are created with ->obsolete set to the value
1262          * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1263          * into this function always.
1264          */
1265
1266         rt6_dst_from_metrics_check(rt);
1267
1268         if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
1269                 return rt6_dst_from_check(rt, cookie);
1270         else
1271                 return rt6_check(rt, cookie);
1272 }
1273
1274 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1275 {
1276         struct rt6_info *rt = (struct rt6_info *) dst;
1277
1278         if (rt) {
1279                 if (rt->rt6i_flags & RTF_CACHE) {
1280                         if (rt6_check_expired(rt)) {
1281                                 ip6_del_rt(rt);
1282                                 dst = NULL;
1283                         }
1284                 } else {
1285                         dst_release(dst);
1286                         dst = NULL;
1287                 }
1288         }
1289         return dst;
1290 }
1291
1292 static void ip6_link_failure(struct sk_buff *skb)
1293 {
1294         struct rt6_info *rt;
1295
1296         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1297
1298         rt = (struct rt6_info *) skb_dst(skb);
1299         if (rt) {
1300                 if (rt->rt6i_flags & RTF_CACHE) {
1301                         dst_hold(&rt->dst);
1302                         ip6_del_rt(rt);
1303                 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1304                         rt->rt6i_node->fn_sernum = -1;
1305                 }
1306         }
1307 }
1308
1309 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1310 {
1311         struct net *net = dev_net(rt->dst.dev);
1312
1313         rt->rt6i_flags |= RTF_MODIFIED;
1314         rt->rt6i_pmtu = mtu;
1315         rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1316 }
1317
1318 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1319                                  const struct ipv6hdr *iph, u32 mtu)
1320 {
1321         struct rt6_info *rt6 = (struct rt6_info *)dst;
1322
1323         if (rt6->rt6i_flags & RTF_LOCAL)
1324                 return;
1325
1326         dst_confirm(dst);
1327         mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1328         if (mtu >= dst_mtu(dst))
1329                 return;
1330
1331         if (rt6->rt6i_flags & RTF_CACHE) {
1332                 rt6_do_update_pmtu(rt6, mtu);
1333         } else {
1334                 const struct in6_addr *daddr, *saddr;
1335                 struct rt6_info *nrt6;
1336
1337                 if (iph) {
1338                         daddr = &iph->daddr;
1339                         saddr = &iph->saddr;
1340                 } else if (sk) {
1341                         daddr = &sk->sk_v6_daddr;
1342                         saddr = &inet6_sk(sk)->saddr;
1343                 } else {
1344                         return;
1345                 }
1346                 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1347                 if (nrt6) {
1348                         rt6_do_update_pmtu(nrt6, mtu);
1349
1350                         /* ip6_ins_rt(nrt6) will bump the
1351                          * rt6->rt6i_node->fn_sernum
1352                          * which will fail the next rt6_check() and
1353                          * invalidate the sk->sk_dst_cache.
1354                          */
1355                         ip6_ins_rt(nrt6);
1356                 }
1357         }
1358 }
1359
1360 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1361                                struct sk_buff *skb, u32 mtu)
1362 {
1363         __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1364 }
1365
1366 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1367                      int oif, u32 mark)
1368 {
1369         const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1370         struct dst_entry *dst;
1371         struct flowi6 fl6;
1372
1373         memset(&fl6, 0, sizeof(fl6));
1374         fl6.flowi6_oif = oif;
1375         fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1376         fl6.daddr = iph->daddr;
1377         fl6.saddr = iph->saddr;
1378         fl6.flowlabel = ip6_flowinfo(iph);
1379
1380         dst = ip6_route_output(net, NULL, &fl6);
1381         if (!dst->error)
1382                 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1383         dst_release(dst);
1384 }
1385 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1386
1387 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1388 {
1389         ip6_update_pmtu(skb, sock_net(sk), mtu,
1390                         sk->sk_bound_dev_if, sk->sk_mark);
1391 }
1392 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1393
1394 /* Handle redirects */
1395 struct ip6rd_flowi {
1396         struct flowi6 fl6;
1397         struct in6_addr gateway;
1398 };
1399
1400 static struct rt6_info *__ip6_route_redirect(struct net *net,
1401                                              struct fib6_table *table,
1402                                              struct flowi6 *fl6,
1403                                              int flags)
1404 {
1405         struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1406         struct rt6_info *rt;
1407         struct fib6_node *fn;
1408
1409         /* Get the "current" route for this destination and
1410          * check if the redirect has come from approriate router.
1411          *
1412          * RFC 4861 specifies that redirects should only be
1413          * accepted if they come from the nexthop to the target.
1414          * Due to the way the routes are chosen, this notion
1415          * is a bit fuzzy and one might need to check all possible
1416          * routes.
1417          */
1418
1419         read_lock_bh(&table->tb6_lock);
1420         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1421 restart:
1422         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1423                 if (rt6_check_expired(rt))
1424                         continue;
1425                 if (rt->dst.error)
1426                         break;
1427                 if (!(rt->rt6i_flags & RTF_GATEWAY))
1428                         continue;
1429                 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1430                         continue;
1431                 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1432                         continue;
1433                 break;
1434         }
1435
1436         if (!rt)
1437                 rt = net->ipv6.ip6_null_entry;
1438         else if (rt->dst.error) {
1439                 rt = net->ipv6.ip6_null_entry;
1440                 goto out;
1441         }
1442
1443         if (rt == net->ipv6.ip6_null_entry) {
1444                 fn = fib6_backtrack(fn, &fl6->saddr);
1445                 if (fn)
1446                         goto restart;
1447         }
1448
1449 out:
1450         dst_hold(&rt->dst);
1451
1452         read_unlock_bh(&table->tb6_lock);
1453
1454         return rt;
1455 };
1456
1457 static struct dst_entry *ip6_route_redirect(struct net *net,
1458                                         const struct flowi6 *fl6,
1459                                         const struct in6_addr *gateway)
1460 {
1461         int flags = RT6_LOOKUP_F_HAS_SADDR;
1462         struct ip6rd_flowi rdfl;
1463
1464         rdfl.fl6 = *fl6;
1465         rdfl.gateway = *gateway;
1466
1467         return fib6_rule_lookup(net, &rdfl.fl6,
1468                                 flags, __ip6_route_redirect);
1469 }
1470
1471 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1472 {
1473         const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1474         struct dst_entry *dst;
1475         struct flowi6 fl6;
1476
1477         memset(&fl6, 0, sizeof(fl6));
1478         fl6.flowi6_iif = LOOPBACK_IFINDEX;
1479         fl6.flowi6_oif = oif;
1480         fl6.flowi6_mark = mark;
1481         fl6.daddr = iph->daddr;
1482         fl6.saddr = iph->saddr;
1483         fl6.flowlabel = ip6_flowinfo(iph);
1484
1485         dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1486         rt6_do_redirect(dst, NULL, skb);
1487         dst_release(dst);
1488 }
1489 EXPORT_SYMBOL_GPL(ip6_redirect);
1490
1491 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1492                             u32 mark)
1493 {
1494         const struct ipv6hdr *iph = ipv6_hdr(skb);
1495         const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1496         struct dst_entry *dst;
1497         struct flowi6 fl6;
1498
1499         memset(&fl6, 0, sizeof(fl6));
1500         fl6.flowi6_iif = LOOPBACK_IFINDEX;
1501         fl6.flowi6_oif = oif;
1502         fl6.flowi6_mark = mark;
1503         fl6.daddr = msg->dest;
1504         fl6.saddr = iph->daddr;
1505
1506         dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1507         rt6_do_redirect(dst, NULL, skb);
1508         dst_release(dst);
1509 }
1510
1511 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1512 {
1513         ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1514 }
1515 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1516
1517 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1518 {
1519         struct net_device *dev = dst->dev;
1520         unsigned int mtu = dst_mtu(dst);
1521         struct net *net = dev_net(dev);
1522
1523         mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1524
1525         if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1526                 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1527
1528         /*
1529          * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1530          * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1531          * IPV6_MAXPLEN is also valid and means: "any MSS,
1532          * rely only on pmtu discovery"
1533          */
1534         if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1535                 mtu = IPV6_MAXPLEN;
1536         return mtu;
1537 }
1538
1539 static unsigned int ip6_mtu(const struct dst_entry *dst)
1540 {
1541         const struct rt6_info *rt = (const struct rt6_info *)dst;
1542         unsigned int mtu = rt->rt6i_pmtu;
1543         struct inet6_dev *idev;
1544
1545         if (mtu)
1546                 goto out;
1547
1548         mtu = dst_metric_raw(dst, RTAX_MTU);
1549         if (mtu)
1550                 goto out;
1551
1552         mtu = IPV6_MIN_MTU;
1553
1554         rcu_read_lock();
1555         idev = __in6_dev_get(dst->dev);
1556         if (idev)
1557                 mtu = idev->cnf.mtu6;
1558         rcu_read_unlock();
1559
1560 out:
1561         return min_t(unsigned int, mtu, IP6_MAX_MTU);
1562 }
1563
1564 static struct dst_entry *icmp6_dst_gc_list;
1565 static DEFINE_SPINLOCK(icmp6_dst_lock);
1566
1567 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1568                                   struct flowi6 *fl6)
1569 {
1570         struct dst_entry *dst;
1571         struct rt6_info *rt;
1572         struct inet6_dev *idev = in6_dev_get(dev);
1573         struct net *net = dev_net(dev);
1574
1575         if (unlikely(!idev))
1576                 return ERR_PTR(-ENODEV);
1577
1578         rt = ip6_dst_alloc(net, dev, 0);
1579         if (unlikely(!rt)) {
1580                 in6_dev_put(idev);
1581                 dst = ERR_PTR(-ENOMEM);
1582                 goto out;
1583         }
1584
1585         rt->dst.flags |= DST_HOST;
1586         rt->dst.output  = ip6_output;
1587         atomic_set(&rt->dst.__refcnt, 1);
1588         rt->rt6i_gateway  = fl6->daddr;
1589         rt->rt6i_dst.addr = fl6->daddr;
1590         rt->rt6i_dst.plen = 128;
1591         rt->rt6i_idev     = idev;
1592         dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1593
1594         spin_lock_bh(&icmp6_dst_lock);
1595         rt->dst.next = icmp6_dst_gc_list;
1596         icmp6_dst_gc_list = &rt->dst;
1597         spin_unlock_bh(&icmp6_dst_lock);
1598
1599         fib6_force_start_gc(net);
1600
1601         dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1602
1603 out:
1604         return dst;
1605 }
1606
1607 int icmp6_dst_gc(void)
1608 {
1609         struct dst_entry *dst, **pprev;
1610         int more = 0;
1611
1612         spin_lock_bh(&icmp6_dst_lock);
1613         pprev = &icmp6_dst_gc_list;
1614
1615         while ((dst = *pprev) != NULL) {
1616                 if (!atomic_read(&dst->__refcnt)) {
1617                         *pprev = dst->next;
1618                         dst_free(dst);
1619                 } else {
1620                         pprev = &dst->next;
1621                         ++more;
1622                 }
1623         }
1624
1625         spin_unlock_bh(&icmp6_dst_lock);
1626
1627         return more;
1628 }
1629
1630 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1631                             void *arg)
1632 {
1633         struct dst_entry *dst, **pprev;
1634
1635         spin_lock_bh(&icmp6_dst_lock);
1636         pprev = &icmp6_dst_gc_list;
1637         while ((dst = *pprev) != NULL) {
1638                 struct rt6_info *rt = (struct rt6_info *) dst;
1639                 if (func(rt, arg)) {
1640                         *pprev = dst->next;
1641                         dst_free(dst);
1642                 } else {
1643                         pprev = &dst->next;
1644                 }
1645         }
1646         spin_unlock_bh(&icmp6_dst_lock);
1647 }
1648
1649 static int ip6_dst_gc(struct dst_ops *ops)
1650 {
1651         struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1652         int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1653         int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1654         int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1655         int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1656         unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1657         int entries;
1658
1659         entries = dst_entries_get_fast(ops);
1660         if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1661             entries <= rt_max_size)
1662                 goto out;
1663
1664         net->ipv6.ip6_rt_gc_expire++;
1665         fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1666         entries = dst_entries_get_slow(ops);
1667         if (entries < ops->gc_thresh)
1668                 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1669 out:
1670         net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1671         return entries > rt_max_size;
1672 }
1673
1674 static int ip6_convert_metrics(struct mx6_config *mxc,
1675                                const struct fib6_config *cfg)
1676 {
1677         bool ecn_ca = false;
1678         struct nlattr *nla;
1679         int remaining;
1680         u32 *mp;
1681
1682         if (!cfg->fc_mx)
1683                 return 0;
1684
1685         mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1686         if (unlikely(!mp))
1687                 return -ENOMEM;
1688
1689         nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1690                 int type = nla_type(nla);
1691                 u32 val;
1692
1693                 if (!type)
1694                         continue;
1695                 if (unlikely(type > RTAX_MAX))
1696                         goto err;
1697
1698                 if (type == RTAX_CC_ALGO) {
1699                         char tmp[TCP_CA_NAME_MAX];
1700
1701                         nla_strlcpy(tmp, nla, sizeof(tmp));
1702                         val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1703                         if (val == TCP_CA_UNSPEC)
1704                                 goto err;
1705                 } else {
1706                         val = nla_get_u32(nla);
1707                 }
1708                 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1709                         goto err;
1710
1711                 mp[type - 1] = val;
1712                 __set_bit(type - 1, mxc->mx_valid);
1713         }
1714
1715         if (ecn_ca) {
1716                 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1717                 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1718         }
1719
1720         mxc->mx = mp;
1721         return 0;
1722  err:
1723         kfree(mp);
1724         return -EINVAL;
1725 }
1726
1727 int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
1728 {
1729         int err;
1730         struct net *net = cfg->fc_nlinfo.nl_net;
1731         struct rt6_info *rt = NULL;
1732         struct net_device *dev = NULL;
1733         struct inet6_dev *idev = NULL;
1734         struct fib6_table *table;
1735         int addr_type;
1736
1737         if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1738                 return -EINVAL;
1739 #ifndef CONFIG_IPV6_SUBTREES
1740         if (cfg->fc_src_len)
1741                 return -EINVAL;
1742 #endif
1743         if (cfg->fc_ifindex) {
1744                 err = -ENODEV;
1745                 dev = dev_get_by_index(net, cfg->fc_ifindex);
1746                 if (!dev)
1747                         goto out;
1748                 idev = in6_dev_get(dev);
1749                 if (!idev)
1750                         goto out;
1751         }
1752
1753         if (cfg->fc_metric == 0)
1754                 cfg->fc_metric = IP6_RT_PRIO_USER;
1755
1756         err = -ENOBUFS;
1757         if (cfg->fc_nlinfo.nlh &&
1758             !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1759                 table = fib6_get_table(net, cfg->fc_table);
1760                 if (!table) {
1761                         pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1762                         table = fib6_new_table(net, cfg->fc_table);
1763                 }
1764         } else {
1765                 table = fib6_new_table(net, cfg->fc_table);
1766         }
1767
1768         if (!table)
1769                 goto out;
1770
1771         rt = ip6_dst_alloc(net, NULL,
1772                            (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1773
1774         if (!rt) {
1775                 err = -ENOMEM;
1776                 goto out;
1777         }
1778
1779         if (cfg->fc_flags & RTF_EXPIRES)
1780                 rt6_set_expires(rt, jiffies +
1781                                 clock_t_to_jiffies(cfg->fc_expires));
1782         else
1783                 rt6_clean_expires(rt);
1784
1785         if (cfg->fc_protocol == RTPROT_UNSPEC)
1786                 cfg->fc_protocol = RTPROT_BOOT;
1787         rt->rt6i_protocol = cfg->fc_protocol;
1788
1789         addr_type = ipv6_addr_type(&cfg->fc_dst);
1790
1791         if (addr_type & IPV6_ADDR_MULTICAST)
1792                 rt->dst.input = ip6_mc_input;
1793         else if (cfg->fc_flags & RTF_LOCAL)
1794                 rt->dst.input = ip6_input;
1795         else
1796                 rt->dst.input = ip6_forward;
1797
1798         rt->dst.output = ip6_output;
1799
1800         if (cfg->fc_encap) {
1801                 struct lwtunnel_state *lwtstate;
1802
1803                 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1804                                            cfg->fc_encap, AF_INET6, cfg,
1805                                            &lwtstate);
1806                 if (err)
1807                         goto out;
1808                 rt->dst.lwtstate = lwtstate_get(lwtstate);
1809                 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1810                         rt->dst.lwtstate->orig_output = rt->dst.output;
1811                         rt->dst.output = lwtunnel_output;
1812                 }
1813                 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1814                         rt->dst.lwtstate->orig_input = rt->dst.input;
1815                         rt->dst.input = lwtunnel_input;
1816                 }
1817         }
1818
1819         ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1820         rt->rt6i_dst.plen = cfg->fc_dst_len;
1821         if (rt->rt6i_dst.plen == 128)
1822                 rt->dst.flags |= DST_HOST;
1823
1824 #ifdef CONFIG_IPV6_SUBTREES
1825         ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1826         rt->rt6i_src.plen = cfg->fc_src_len;
1827 #endif
1828
1829         rt->rt6i_metric = cfg->fc_metric;
1830
1831         /* We cannot add true routes via loopback here,
1832            they would result in kernel looping; promote them to reject routes
1833          */
1834         if ((cfg->fc_flags & RTF_REJECT) ||
1835             (dev && (dev->flags & IFF_LOOPBACK) &&
1836              !(addr_type & IPV6_ADDR_LOOPBACK) &&
1837              !(cfg->fc_flags & RTF_LOCAL))) {
1838                 /* hold loopback dev/idev if we haven't done so. */
1839                 if (dev != net->loopback_dev) {
1840                         if (dev) {
1841                                 dev_put(dev);
1842                                 in6_dev_put(idev);
1843                         }
1844                         dev = net->loopback_dev;
1845                         dev_hold(dev);
1846                         idev = in6_dev_get(dev);
1847                         if (!idev) {
1848                                 err = -ENODEV;
1849                                 goto out;
1850                         }
1851                 }
1852                 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1853                 switch (cfg->fc_type) {
1854                 case RTN_BLACKHOLE:
1855                         rt->dst.error = -EINVAL;
1856                         rt->dst.output = dst_discard_sk;
1857                         rt->dst.input = dst_discard;
1858                         break;
1859                 case RTN_PROHIBIT:
1860                         rt->dst.error = -EACCES;
1861                         rt->dst.output = ip6_pkt_prohibit_out;
1862                         rt->dst.input = ip6_pkt_prohibit;
1863                         break;
1864                 case RTN_THROW:
1865                 case RTN_UNREACHABLE:
1866                 default:
1867                         rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1868                                         : (cfg->fc_type == RTN_UNREACHABLE)
1869                                         ? -EHOSTUNREACH : -ENETUNREACH;
1870                         rt->dst.output = ip6_pkt_discard_out;
1871                         rt->dst.input = ip6_pkt_discard;
1872                         break;
1873                 }
1874                 goto install_route;
1875         }
1876
1877         if (cfg->fc_flags & RTF_GATEWAY) {
1878                 const struct in6_addr *gw_addr;
1879                 int gwa_type;
1880
1881                 gw_addr = &cfg->fc_gateway;
1882                 gwa_type = ipv6_addr_type(gw_addr);
1883
1884                 /* if gw_addr is local we will fail to detect this in case
1885                  * address is still TENTATIVE (DAD in progress). rt6_lookup()
1886                  * will return already-added prefix route via interface that
1887                  * prefix route was assigned to, which might be non-loopback.
1888                  */
1889                 err = -EINVAL;
1890                 if (ipv6_chk_addr_and_flags(net, gw_addr,
1891                                             gwa_type & IPV6_ADDR_LINKLOCAL ?
1892                                             dev : NULL, 0, 0))
1893                         goto out;
1894
1895                 rt->rt6i_gateway = *gw_addr;
1896
1897                 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1898                         struct rt6_info *grt;
1899
1900                         /* IPv6 strictly inhibits using not link-local
1901                            addresses as nexthop address.
1902                            Otherwise, router will not able to send redirects.
1903                            It is very good, but in some (rare!) circumstances
1904                            (SIT, PtP, NBMA NOARP links) it is handy to allow
1905                            some exceptions. --ANK
1906                          */
1907                         if (!(gwa_type & IPV6_ADDR_UNICAST))
1908                                 goto out;
1909
1910                         grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1911
1912                         err = -EHOSTUNREACH;
1913                         if (!grt)
1914                                 goto out;
1915                         if (dev) {
1916                                 if (dev != grt->dst.dev) {
1917                                         ip6_rt_put(grt);
1918                                         goto out;
1919                                 }
1920                         } else {
1921                                 dev = grt->dst.dev;
1922                                 idev = grt->rt6i_idev;
1923                                 dev_hold(dev);
1924                                 in6_dev_hold(grt->rt6i_idev);
1925                         }
1926                         if (!(grt->rt6i_flags & RTF_GATEWAY))
1927                                 err = 0;
1928                         ip6_rt_put(grt);
1929
1930                         if (err)
1931                                 goto out;
1932                 }
1933                 err = -EINVAL;
1934                 if (!dev || (dev->flags & IFF_LOOPBACK))
1935                         goto out;
1936         }
1937
1938         err = -ENODEV;
1939         if (!dev)
1940                 goto out;
1941
1942         if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1943                 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1944                         err = -EINVAL;
1945                         goto out;
1946                 }
1947                 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1948                 rt->rt6i_prefsrc.plen = 128;
1949         } else
1950                 rt->rt6i_prefsrc.plen = 0;
1951
1952         rt->rt6i_flags = cfg->fc_flags;
1953
1954 install_route:
1955         rt->dst.dev = dev;
1956         rt->rt6i_idev = idev;
1957         rt->rt6i_table = table;
1958
1959         cfg->fc_nlinfo.nl_net = dev_net(dev);
1960
1961         *rt_ret = rt;
1962
1963         return 0;
1964 out:
1965         if (dev)
1966                 dev_put(dev);
1967         if (idev)
1968                 in6_dev_put(idev);
1969         if (rt)
1970                 dst_free(&rt->dst);
1971
1972         *rt_ret = NULL;
1973
1974         return err;
1975 }
1976
1977 int ip6_route_add(struct fib6_config *cfg)
1978 {
1979         struct mx6_config mxc = { .mx = NULL, };
1980         struct rt6_info *rt = NULL;
1981         int err;
1982
1983         err = ip6_route_info_create(cfg, &rt);
1984         if (err)
1985                 goto out;
1986
1987         err = ip6_convert_metrics(&mxc, cfg);
1988         if (err)
1989                 goto out;
1990
1991         err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
1992
1993         kfree(mxc.mx);
1994
1995         return err;
1996 out:
1997         if (rt)
1998                 dst_free(&rt->dst);
1999
2000         return err;
2001 }
2002
2003 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2004 {
2005         int err;
2006         struct fib6_table *table;
2007         struct net *net = dev_net(rt->dst.dev);
2008
2009         if (rt == net->ipv6.ip6_null_entry ||
2010             rt->dst.flags & DST_NOCACHE) {
2011                 err = -ENOENT;
2012                 goto out;
2013         }
2014
2015         table = rt->rt6i_table;
2016         write_lock_bh(&table->tb6_lock);
2017         err = fib6_del(rt, info);
2018         write_unlock_bh(&table->tb6_lock);
2019
2020 out:
2021         ip6_rt_put(rt);
2022         return err;
2023 }
2024
2025 int ip6_del_rt(struct rt6_info *rt)
2026 {
2027         struct nl_info info = {
2028                 .nl_net = dev_net(rt->dst.dev),
2029         };
2030         return __ip6_del_rt(rt, &info);
2031 }
2032
2033 static int ip6_route_del(struct fib6_config *cfg)
2034 {
2035         struct fib6_table *table;
2036         struct fib6_node *fn;
2037         struct rt6_info *rt;
2038         int err = -ESRCH;
2039
2040         table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2041         if (!table)
2042                 return err;
2043
2044         read_lock_bh(&table->tb6_lock);
2045
2046         fn = fib6_locate(&table->tb6_root,
2047                          &cfg->fc_dst, cfg->fc_dst_len,
2048                          &cfg->fc_src, cfg->fc_src_len);
2049
2050         if (fn) {
2051                 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2052                         if ((rt->rt6i_flags & RTF_CACHE) &&
2053                             !(cfg->fc_flags & RTF_CACHE))
2054                                 continue;
2055                         if (cfg->fc_ifindex &&
2056                             (!rt->dst.dev ||
2057                              rt->dst.dev->ifindex != cfg->fc_ifindex))
2058                                 continue;
2059                         if (cfg->fc_flags & RTF_GATEWAY &&
2060                             !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2061                                 continue;
2062                         if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2063                                 continue;
2064                         dst_hold(&rt->dst);
2065                         read_unlock_bh(&table->tb6_lock);
2066
2067                         return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2068                 }
2069         }
2070         read_unlock_bh(&table->tb6_lock);
2071
2072         return err;
2073 }
2074
2075 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2076 {
2077         struct net *net = dev_net(skb->dev);
2078         struct netevent_redirect netevent;
2079         struct rt6_info *rt, *nrt = NULL;
2080         struct ndisc_options ndopts;
2081         struct inet6_dev *in6_dev;
2082         struct neighbour *neigh;
2083         struct rd_msg *msg;
2084         int optlen, on_link;
2085         u8 *lladdr;
2086
2087         optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2088         optlen -= sizeof(*msg);
2089
2090         if (optlen < 0) {
2091                 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2092                 return;
2093         }
2094
2095         msg = (struct rd_msg *)icmp6_hdr(skb);
2096
2097         if (ipv6_addr_is_multicast(&msg->dest)) {
2098                 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2099                 return;
2100         }
2101
2102         on_link = 0;
2103         if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2104                 on_link = 1;
2105         } else if (ipv6_addr_type(&msg->target) !=
2106                    (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2107                 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2108                 return;
2109         }
2110
2111         in6_dev = __in6_dev_get(skb->dev);
2112         if (!in6_dev)
2113                 return;
2114         if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2115                 return;
2116
2117         /* RFC2461 8.1:
2118          *      The IP source address of the Redirect MUST be the same as the current
2119          *      first-hop router for the specified ICMP Destination Address.
2120          */
2121
2122         if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2123                 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2124                 return;
2125         }
2126
2127         lladdr = NULL;
2128         if (ndopts.nd_opts_tgt_lladdr) {
2129                 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2130                                              skb->dev);
2131                 if (!lladdr) {
2132                         net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2133                         return;
2134                 }
2135         }
2136
2137         rt = (struct rt6_info *) dst;
2138         if (rt == net->ipv6.ip6_null_entry) {
2139                 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2140                 return;
2141         }
2142
2143         /* Redirect received -> path was valid.
2144          * Look, redirects are sent only in response to data packets,
2145          * so that this nexthop apparently is reachable. --ANK
2146          */
2147         dst_confirm(&rt->dst);
2148
2149         neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2150         if (!neigh)
2151                 return;
2152
2153         /*
2154          *      We have finally decided to accept it.
2155          */
2156
2157         neigh_update(neigh, lladdr, NUD_STALE,
2158                      NEIGH_UPDATE_F_WEAK_OVERRIDE|
2159                      NEIGH_UPDATE_F_OVERRIDE|
2160                      (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2161                                      NEIGH_UPDATE_F_ISROUTER))
2162                      );
2163
2164         nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2165         if (!nrt)
2166                 goto out;
2167
2168         nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2169         if (on_link)
2170                 nrt->rt6i_flags &= ~RTF_GATEWAY;
2171
2172         nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2173
2174         if (ip6_ins_rt(nrt))
2175                 goto out;
2176
2177         netevent.old = &rt->dst;
2178         netevent.new = &nrt->dst;
2179         netevent.daddr = &msg->dest;
2180         netevent.neigh = neigh;
2181         call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2182
2183         if (rt->rt6i_flags & RTF_CACHE) {
2184                 rt = (struct rt6_info *) dst_clone(&rt->dst);
2185                 ip6_del_rt(rt);
2186         }
2187
2188 out:
2189         neigh_release(neigh);
2190 }
2191
2192 /*
2193  *      Misc support functions
2194  */
2195
2196 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2197 {
2198         BUG_ON(from->dst.from);
2199
2200         rt->rt6i_flags &= ~RTF_EXPIRES;
2201         dst_hold(&from->dst);
2202         rt->dst.from = &from->dst;
2203         dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2204 }
2205
2206 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2207 {
2208         rt->dst.input = ort->dst.input;
2209         rt->dst.output = ort->dst.output;
2210         rt->rt6i_dst = ort->rt6i_dst;
2211         rt->dst.error = ort->dst.error;
2212         rt->rt6i_idev = ort->rt6i_idev;
2213         if (rt->rt6i_idev)
2214                 in6_dev_hold(rt->rt6i_idev);
2215         rt->dst.lastuse = jiffies;
2216         rt->rt6i_gateway = ort->rt6i_gateway;
2217         rt->rt6i_flags = ort->rt6i_flags;
2218         rt6_set_from(rt, ort);
2219         rt->rt6i_metric = ort->rt6i_metric;
2220 #ifdef CONFIG_IPV6_SUBTREES
2221         rt->rt6i_src = ort->rt6i_src;
2222 #endif
2223         rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2224         rt->rt6i_table = ort->rt6i_table;
2225         rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2226 }
2227
2228 #ifdef CONFIG_IPV6_ROUTE_INFO
2229 static struct rt6_info *rt6_get_route_info(struct net *net,
2230                                            const struct in6_addr *prefix, int prefixlen,
2231                                            const struct in6_addr *gwaddr, int ifindex)
2232 {
2233         struct fib6_node *fn;
2234         struct rt6_info *rt = NULL;
2235         struct fib6_table *table;
2236
2237         table = fib6_get_table(net, RT6_TABLE_INFO);
2238         if (!table)
2239                 return NULL;
2240
2241         read_lock_bh(&table->tb6_lock);
2242         fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2243         if (!fn)
2244                 goto out;
2245
2246         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2247                 if (rt->dst.dev->ifindex != ifindex)
2248                         continue;
2249                 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2250                         continue;
2251                 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2252                         continue;
2253                 dst_hold(&rt->dst);
2254                 break;
2255         }
2256 out:
2257         read_unlock_bh(&table->tb6_lock);
2258         return rt;
2259 }
2260
2261 static struct rt6_info *rt6_add_route_info(struct net *net,
2262                                            const struct in6_addr *prefix, int prefixlen,
2263                                            const struct in6_addr *gwaddr, int ifindex,
2264                                            unsigned int pref)
2265 {
2266         struct fib6_config cfg = {
2267                 .fc_table       = RT6_TABLE_INFO,
2268                 .fc_metric      = IP6_RT_PRIO_USER,
2269                 .fc_ifindex     = ifindex,
2270                 .fc_dst_len     = prefixlen,
2271                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2272                                   RTF_UP | RTF_PREF(pref),
2273                 .fc_nlinfo.portid = 0,
2274                 .fc_nlinfo.nlh = NULL,
2275                 .fc_nlinfo.nl_net = net,
2276         };
2277
2278         cfg.fc_dst = *prefix;
2279         cfg.fc_gateway = *gwaddr;
2280
2281         /* We should treat it as a default route if prefix length is 0. */
2282         if (!prefixlen)
2283                 cfg.fc_flags |= RTF_DEFAULT;
2284
2285         ip6_route_add(&cfg);
2286
2287         return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2288 }
2289 #endif
2290
2291 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2292 {
2293         struct rt6_info *rt;
2294         struct fib6_table *table;
2295
2296         table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2297         if (!table)
2298                 return NULL;
2299
2300         read_lock_bh(&table->tb6_lock);
2301         for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2302                 if (dev == rt->dst.dev &&
2303                     ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2304                     ipv6_addr_equal(&rt->rt6i_gateway, addr))
2305                         break;
2306         }
2307         if (rt)
2308                 dst_hold(&rt->dst);
2309         read_unlock_bh(&table->tb6_lock);
2310         return rt;
2311 }
2312
2313 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2314                                      struct net_device *dev,
2315                                      unsigned int pref)
2316 {
2317         struct fib6_config cfg = {
2318                 .fc_table       = RT6_TABLE_DFLT,
2319                 .fc_metric      = IP6_RT_PRIO_USER,
2320                 .fc_ifindex     = dev->ifindex,
2321                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2322                                   RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2323                 .fc_nlinfo.portid = 0,
2324                 .fc_nlinfo.nlh = NULL,
2325                 .fc_nlinfo.nl_net = dev_net(dev),
2326         };
2327
2328         cfg.fc_gateway = *gwaddr;
2329
2330         ip6_route_add(&cfg);
2331
2332         return rt6_get_dflt_router(gwaddr, dev);
2333 }
2334
2335 void rt6_purge_dflt_routers(struct net *net)
2336 {
2337         struct rt6_info *rt;
2338         struct fib6_table *table;
2339
2340         /* NOTE: Keep consistent with rt6_get_dflt_router */
2341         table = fib6_get_table(net, RT6_TABLE_DFLT);
2342         if (!table)
2343                 return;
2344
2345 restart:
2346         read_lock_bh(&table->tb6_lock);
2347         for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2348                 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2349                     (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2350                         dst_hold(&rt->dst);
2351                         read_unlock_bh(&table->tb6_lock);
2352                         ip6_del_rt(rt);
2353                         goto restart;
2354                 }
2355         }
2356         read_unlock_bh(&table->tb6_lock);
2357 }
2358
2359 static void rtmsg_to_fib6_config(struct net *net,
2360                                  struct in6_rtmsg *rtmsg,
2361                                  struct fib6_config *cfg)
2362 {
2363         memset(cfg, 0, sizeof(*cfg));
2364
2365         cfg->fc_table = RT6_TABLE_MAIN;
2366         cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2367         cfg->fc_metric = rtmsg->rtmsg_metric;
2368         cfg->fc_expires = rtmsg->rtmsg_info;
2369         cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2370         cfg->fc_src_len = rtmsg->rtmsg_src_len;
2371         cfg->fc_flags = rtmsg->rtmsg_flags;
2372
2373         cfg->fc_nlinfo.nl_net = net;
2374
2375         cfg->fc_dst = rtmsg->rtmsg_dst;
2376         cfg->fc_src = rtmsg->rtmsg_src;
2377         cfg->fc_gateway = rtmsg->rtmsg_gateway;
2378 }
2379
2380 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2381 {
2382         struct fib6_config cfg;
2383         struct in6_rtmsg rtmsg;
2384         int err;
2385
2386         switch (cmd) {
2387         case SIOCADDRT:         /* Add a route */
2388         case SIOCDELRT:         /* Delete a route */
2389                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2390                         return -EPERM;
2391                 err = copy_from_user(&rtmsg, arg,
2392                                      sizeof(struct in6_rtmsg));
2393                 if (err)
2394                         return -EFAULT;
2395
2396                 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2397
2398                 rtnl_lock();
2399                 switch (cmd) {
2400                 case SIOCADDRT:
2401                         err = ip6_route_add(&cfg);
2402                         break;
2403                 case SIOCDELRT:
2404                         err = ip6_route_del(&cfg);
2405                         break;
2406                 default:
2407                         err = -EINVAL;
2408                 }
2409                 rtnl_unlock();
2410
2411                 return err;
2412         }
2413
2414         return -EINVAL;
2415 }
2416
2417 /*
2418  *      Drop the packet on the floor
2419  */
2420
2421 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2422 {
2423         int type;
2424         struct dst_entry *dst = skb_dst(skb);
2425         switch (ipstats_mib_noroutes) {
2426         case IPSTATS_MIB_INNOROUTES:
2427                 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2428                 if (type == IPV6_ADDR_ANY) {
2429                         IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2430                                       IPSTATS_MIB_INADDRERRORS);
2431                         break;
2432                 }
2433                 /* FALLTHROUGH */
2434         case IPSTATS_MIB_OUTNOROUTES:
2435                 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2436                               ipstats_mib_noroutes);
2437                 break;
2438         }
2439         icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2440         kfree_skb(skb);
2441         return 0;
2442 }
2443
2444 static int ip6_pkt_discard(struct sk_buff *skb)
2445 {
2446         return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2447 }
2448
2449 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2450 {
2451         skb->dev = skb_dst(skb)->dev;
2452         return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2453 }
2454
2455 static int ip6_pkt_prohibit(struct sk_buff *skb)
2456 {
2457         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2458 }
2459
2460 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2461 {
2462         skb->dev = skb_dst(skb)->dev;
2463         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2464 }
2465
2466 /*
2467  *      Allocate a dst for local (unicast / anycast) address.
2468  */
2469
2470 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2471                                     const struct in6_addr *addr,
2472                                     bool anycast)
2473 {
2474         struct net *net = dev_net(idev->dev);
2475         struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2476                                             DST_NOCOUNT);
2477         if (!rt)
2478                 return ERR_PTR(-ENOMEM);
2479
2480         in6_dev_hold(idev);
2481
2482         rt->dst.flags |= DST_HOST;
2483         rt->dst.input = ip6_input;
2484         rt->dst.output = ip6_output;
2485         rt->rt6i_idev = idev;
2486
2487         rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2488         if (anycast)
2489                 rt->rt6i_flags |= RTF_ANYCAST;
2490         else
2491                 rt->rt6i_flags |= RTF_LOCAL;
2492
2493         rt->rt6i_gateway  = *addr;
2494         rt->rt6i_dst.addr = *addr;
2495         rt->rt6i_dst.plen = 128;
2496         rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2497         rt->dst.flags |= DST_NOCACHE;
2498
2499         atomic_set(&rt->dst.__refcnt, 1);
2500
2501         return rt;
2502 }
2503
2504 int ip6_route_get_saddr(struct net *net,
2505                         struct rt6_info *rt,
2506                         const struct in6_addr *daddr,
2507                         unsigned int prefs,
2508                         struct in6_addr *saddr)
2509 {
2510         struct inet6_dev *idev =
2511                 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2512         int err = 0;
2513         if (rt && rt->rt6i_prefsrc.plen)
2514                 *saddr = rt->rt6i_prefsrc.addr;
2515         else
2516                 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2517                                          daddr, prefs, saddr);
2518         return err;
2519 }
2520
2521 /* remove deleted ip from prefsrc entries */
2522 struct arg_dev_net_ip {
2523         struct net_device *dev;
2524         struct net *net;
2525         struct in6_addr *addr;
2526 };
2527
2528 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2529 {
2530         struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2531         struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2532         struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2533
2534         if (((void *)rt->dst.dev == dev || !dev) &&
2535             rt != net->ipv6.ip6_null_entry &&
2536             ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2537                 /* remove prefsrc entry */
2538                 rt->rt6i_prefsrc.plen = 0;
2539         }
2540         return 0;
2541 }
2542
2543 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2544 {
2545         struct net *net = dev_net(ifp->idev->dev);
2546         struct arg_dev_net_ip adni = {
2547                 .dev = ifp->idev->dev,
2548                 .net = net,
2549                 .addr = &ifp->addr,
2550         };
2551         fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2552 }
2553
2554 #define RTF_RA_ROUTER           (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2555 #define RTF_CACHE_GATEWAY       (RTF_GATEWAY | RTF_CACHE)
2556
2557 /* Remove routers and update dst entries when gateway turn into host. */
2558 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2559 {
2560         struct in6_addr *gateway = (struct in6_addr *)arg;
2561
2562         if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2563              ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2564              ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2565                 return -1;
2566         }
2567         return 0;
2568 }
2569
2570 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2571 {
2572         fib6_clean_all(net, fib6_clean_tohost, gateway);
2573 }
2574
2575 struct arg_dev_net {
2576         struct net_device *dev;
2577         struct net *net;
2578 };
2579
2580 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2581 {
2582         const struct arg_dev_net *adn = arg;
2583         const struct net_device *dev = adn->dev;
2584
2585         if ((rt->dst.dev == dev || !dev) &&
2586             rt != adn->net->ipv6.ip6_null_entry)
2587                 return -1;
2588
2589         return 0;
2590 }
2591
2592 void rt6_ifdown(struct net *net, struct net_device *dev)
2593 {
2594         struct arg_dev_net adn = {
2595                 .dev = dev,
2596                 .net = net,
2597         };
2598
2599         fib6_clean_all(net, fib6_ifdown, &adn);
2600         icmp6_clean_all(fib6_ifdown, &adn);
2601         rt6_uncached_list_flush_dev(net, dev);
2602 }
2603
2604 struct rt6_mtu_change_arg {
2605         struct net_device *dev;
2606         unsigned int mtu;
2607 };
2608
2609 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2610 {
2611         struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2612         struct inet6_dev *idev;
2613
2614         /* In IPv6 pmtu discovery is not optional,
2615            so that RTAX_MTU lock cannot disable it.
2616            We still use this lock to block changes
2617            caused by addrconf/ndisc.
2618         */
2619
2620         idev = __in6_dev_get(arg->dev);
2621         if (!idev)
2622                 return 0;
2623
2624         /* For administrative MTU increase, there is no way to discover
2625            IPv6 PMTU increase, so PMTU increase should be updated here.
2626            Since RFC 1981 doesn't include administrative MTU increase
2627            update PMTU increase is a MUST. (i.e. jumbo frame)
2628          */
2629         /*
2630            If new MTU is less than route PMTU, this new MTU will be the
2631            lowest MTU in the path, update the route PMTU to reflect PMTU
2632            decreases; if new MTU is greater than route PMTU, and the
2633            old MTU is the lowest MTU in the path, update the route PMTU
2634            to reflect the increase. In this case if the other nodes' MTU
2635            also have the lowest MTU, TOO BIG MESSAGE will be lead to
2636            PMTU discouvery.
2637          */
2638         if (rt->dst.dev == arg->dev &&
2639             !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2640                 if (rt->rt6i_flags & RTF_CACHE) {
2641                         /* For RTF_CACHE with rt6i_pmtu == 0
2642                          * (i.e. a redirected route),
2643                          * the metrics of its rt->dst.from has already
2644                          * been updated.
2645                          */
2646                         if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2647                                 rt->rt6i_pmtu = arg->mtu;
2648                 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2649                            (dst_mtu(&rt->dst) < arg->mtu &&
2650                             dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2651                         dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2652                 }
2653         }
2654         return 0;
2655 }
2656
2657 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2658 {
2659         struct rt6_mtu_change_arg arg = {
2660                 .dev = dev,
2661                 .mtu = mtu,
2662         };
2663
2664         fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2665 }
2666
2667 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2668         [RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
2669         [RTA_OIF]               = { .type = NLA_U32 },
2670         [RTA_IIF]               = { .type = NLA_U32 },
2671         [RTA_PRIORITY]          = { .type = NLA_U32 },
2672         [RTA_METRICS]           = { .type = NLA_NESTED },
2673         [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
2674         [RTA_PREF]              = { .type = NLA_U8 },
2675         [RTA_ENCAP_TYPE]        = { .type = NLA_U16 },
2676         [RTA_ENCAP]             = { .type = NLA_NESTED },
2677 };
2678
2679 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2680                               struct fib6_config *cfg)
2681 {
2682         struct rtmsg *rtm;
2683         struct nlattr *tb[RTA_MAX+1];
2684         unsigned int pref;
2685         int err;
2686
2687         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2688         if (err < 0)
2689                 goto errout;
2690
2691         err = -EINVAL;
2692         rtm = nlmsg_data(nlh);
2693         memset(cfg, 0, sizeof(*cfg));
2694
2695         cfg->fc_table = rtm->rtm_table;
2696         cfg->fc_dst_len = rtm->rtm_dst_len;
2697         cfg->fc_src_len = rtm->rtm_src_len;
2698         cfg->fc_flags = RTF_UP;
2699         cfg->fc_protocol = rtm->rtm_protocol;
2700         cfg->fc_type = rtm->rtm_type;
2701
2702         if (rtm->rtm_type == RTN_UNREACHABLE ||
2703             rtm->rtm_type == RTN_BLACKHOLE ||
2704             rtm->rtm_type == RTN_PROHIBIT ||
2705             rtm->rtm_type == RTN_THROW)
2706                 cfg->fc_flags |= RTF_REJECT;
2707
2708         if (rtm->rtm_type == RTN_LOCAL)
2709                 cfg->fc_flags |= RTF_LOCAL;
2710
2711         if (rtm->rtm_flags & RTM_F_CLONED)
2712                 cfg->fc_flags |= RTF_CACHE;
2713
2714         cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2715         cfg->fc_nlinfo.nlh = nlh;
2716         cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2717
2718         if (tb[RTA_GATEWAY]) {
2719                 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2720                 cfg->fc_flags |= RTF_GATEWAY;
2721         }
2722
2723         if (tb[RTA_DST]) {
2724                 int plen = (rtm->rtm_dst_len + 7) >> 3;
2725
2726                 if (nla_len(tb[RTA_DST]) < plen)
2727                         goto errout;
2728
2729                 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2730         }
2731
2732         if (tb[RTA_SRC]) {
2733                 int plen = (rtm->rtm_src_len + 7) >> 3;
2734
2735                 if (nla_len(tb[RTA_SRC]) < plen)
2736                         goto errout;
2737
2738                 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2739         }
2740
2741         if (tb[RTA_PREFSRC])
2742                 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2743
2744         if (tb[RTA_OIF])
2745                 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2746
2747         if (tb[RTA_PRIORITY])
2748                 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2749
2750         if (tb[RTA_METRICS]) {
2751                 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2752                 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2753         }
2754
2755         if (tb[RTA_TABLE])
2756                 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2757
2758         if (tb[RTA_MULTIPATH]) {
2759                 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2760                 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2761         }
2762
2763         if (tb[RTA_PREF]) {
2764                 pref = nla_get_u8(tb[RTA_PREF]);
2765                 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2766                     pref != ICMPV6_ROUTER_PREF_HIGH)
2767                         pref = ICMPV6_ROUTER_PREF_MEDIUM;
2768                 cfg->fc_flags |= RTF_PREF(pref);
2769         }
2770
2771         if (tb[RTA_ENCAP])
2772                 cfg->fc_encap = tb[RTA_ENCAP];
2773
2774         if (tb[RTA_ENCAP_TYPE])
2775                 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2776
2777         err = 0;
2778 errout:
2779         return err;
2780 }
2781
2782 struct rt6_nh {
2783         struct rt6_info *rt6_info;
2784         struct fib6_config r_cfg;
2785         struct mx6_config mxc;
2786         struct list_head next;
2787 };
2788
2789 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2790 {
2791         struct rt6_nh *nh;
2792
2793         list_for_each_entry(nh, rt6_nh_list, next) {
2794                 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2795                         &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2796                         nh->r_cfg.fc_ifindex);
2797         }
2798 }
2799
2800 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2801                                  struct rt6_info *rt, struct fib6_config *r_cfg)
2802 {
2803         struct rt6_nh *nh;
2804         struct rt6_info *rtnh;
2805         int err = -EEXIST;
2806
2807         list_for_each_entry(nh, rt6_nh_list, next) {
2808                 /* check if rt6_info already exists */
2809                 rtnh = nh->rt6_info;
2810
2811                 if (rtnh->dst.dev == rt->dst.dev &&
2812                     rtnh->rt6i_idev == rt->rt6i_idev &&
2813                     ipv6_addr_equal(&rtnh->rt6i_gateway,
2814                                     &rt->rt6i_gateway))
2815                         return err;
2816         }
2817
2818         nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2819         if (!nh)
2820                 return -ENOMEM;
2821         nh->rt6_info = rt;
2822         err = ip6_convert_metrics(&nh->mxc, r_cfg);
2823         if (err) {
2824                 kfree(nh);
2825                 return err;
2826         }
2827         memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2828         list_add_tail(&nh->next, rt6_nh_list);
2829
2830         return 0;
2831 }
2832
2833 static int ip6_route_multipath_add(struct fib6_config *cfg)
2834 {
2835         struct fib6_config r_cfg;
2836         struct rtnexthop *rtnh;
2837         struct rt6_info *rt;
2838         struct rt6_nh *err_nh;
2839         struct rt6_nh *nh, *nh_safe;
2840         int remaining;
2841         int attrlen;
2842         int err = 1;
2843         int nhn = 0;
2844         int replace = (cfg->fc_nlinfo.nlh &&
2845                        (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2846         LIST_HEAD(rt6_nh_list);
2847
2848         remaining = cfg->fc_mp_len;
2849         rtnh = (struct rtnexthop *)cfg->fc_mp;
2850
2851         /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2852          * rt6_info structs per nexthop
2853          */
2854         while (rtnh_ok(rtnh, remaining)) {
2855                 memcpy(&r_cfg, cfg, sizeof(*cfg));
2856                 if (rtnh->rtnh_ifindex)
2857                         r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2858
2859                 attrlen = rtnh_attrlen(rtnh);
2860                 if (attrlen > 0) {
2861                         struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2862
2863                         nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2864                         if (nla) {
2865                                 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2866                                 r_cfg.fc_flags |= RTF_GATEWAY;
2867                         }
2868                         r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2869                         nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2870                         if (nla)
2871                                 r_cfg.fc_encap_type = nla_get_u16(nla);
2872                 }
2873
2874                 err = ip6_route_info_create(&r_cfg, &rt);
2875                 if (err)
2876                         goto cleanup;
2877
2878                 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2879                 if (err) {
2880                         dst_free(&rt->dst);
2881                         goto cleanup;
2882                 }
2883
2884                 rtnh = rtnh_next(rtnh, &remaining);
2885         }
2886
2887         err_nh = NULL;
2888         list_for_each_entry(nh, &rt6_nh_list, next) {
2889                 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2890                 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2891                 nh->rt6_info = NULL;
2892                 if (err) {
2893                         if (replace && nhn)
2894                                 ip6_print_replace_route_err(&rt6_nh_list);
2895                         err_nh = nh;
2896                         goto add_errout;
2897                 }
2898
2899                 /* Because each route is added like a single route we remove
2900                  * these flags after the first nexthop: if there is a collision,
2901                  * we have already failed to add the first nexthop:
2902                  * fib6_add_rt2node() has rejected it; when replacing, old
2903                  * nexthops have been replaced by first new, the rest should
2904                  * be added to it.
2905                  */
2906                 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2907                                                      NLM_F_REPLACE);
2908                 nhn++;
2909         }
2910
2911         goto cleanup;
2912
2913 add_errout:
2914         /* Delete routes that were already added */
2915         list_for_each_entry(nh, &rt6_nh_list, next) {
2916                 if (err_nh == nh)
2917                         break;
2918                 ip6_route_del(&nh->r_cfg);
2919         }
2920
2921 cleanup:
2922         list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2923                 if (nh->rt6_info)
2924                         dst_free(&nh->rt6_info->dst);
2925                 kfree(nh->mxc.mx);
2926                 list_del(&nh->next);
2927                 kfree(nh);
2928         }
2929
2930         return err;
2931 }
2932
2933 static int ip6_route_multipath_del(struct fib6_config *cfg)
2934 {
2935         struct fib6_config r_cfg;
2936         struct rtnexthop *rtnh;
2937         int remaining;
2938         int attrlen;
2939         int err = 1, last_err = 0;
2940
2941         remaining = cfg->fc_mp_len;
2942         rtnh = (struct rtnexthop *)cfg->fc_mp;
2943
2944         /* Parse a Multipath Entry */
2945         while (rtnh_ok(rtnh, remaining)) {
2946                 memcpy(&r_cfg, cfg, sizeof(*cfg));
2947                 if (rtnh->rtnh_ifindex)
2948                         r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2949
2950                 attrlen = rtnh_attrlen(rtnh);
2951                 if (attrlen > 0) {
2952                         struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2953
2954                         nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2955                         if (nla) {
2956                                 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2957                                 r_cfg.fc_flags |= RTF_GATEWAY;
2958                         }
2959                 }
2960                 err = ip6_route_del(&r_cfg);
2961                 if (err)
2962                         last_err = err;
2963
2964                 rtnh = rtnh_next(rtnh, &remaining);
2965         }
2966
2967         return last_err;
2968 }
2969
2970 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2971 {
2972         struct fib6_config cfg;
2973         int err;
2974
2975         err = rtm_to_fib6_config(skb, nlh, &cfg);
2976         if (err < 0)
2977                 return err;
2978
2979         if (cfg.fc_mp)
2980                 return ip6_route_multipath_del(&cfg);
2981         else
2982                 return ip6_route_del(&cfg);
2983 }
2984
2985 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2986 {
2987         struct fib6_config cfg;
2988         int err;
2989
2990         err = rtm_to_fib6_config(skb, nlh, &cfg);
2991         if (err < 0)
2992                 return err;
2993
2994         if (cfg.fc_mp)
2995                 return ip6_route_multipath_add(&cfg);
2996         else
2997                 return ip6_route_add(&cfg);
2998 }
2999
3000 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3001 {
3002         return NLMSG_ALIGN(sizeof(struct rtmsg))
3003                + nla_total_size(16) /* RTA_SRC */
3004                + nla_total_size(16) /* RTA_DST */
3005                + nla_total_size(16) /* RTA_GATEWAY */
3006                + nla_total_size(16) /* RTA_PREFSRC */
3007                + nla_total_size(4) /* RTA_TABLE */
3008                + nla_total_size(4) /* RTA_IIF */
3009                + nla_total_size(4) /* RTA_OIF */
3010                + nla_total_size(4) /* RTA_PRIORITY */
3011                + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3012                + nla_total_size(sizeof(struct rta_cacheinfo))
3013                + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3014                + nla_total_size(1) /* RTA_PREF */
3015                + lwtunnel_get_encap_size(rt->dst.lwtstate);
3016 }
3017
3018 static int rt6_fill_node(struct net *net,
3019                          struct sk_buff *skb, struct rt6_info *rt,
3020                          struct in6_addr *dst, struct in6_addr *src,
3021                          int iif, int type, u32 portid, u32 seq,
3022                          int prefix, int nowait, unsigned int flags)
3023 {
3024         u32 metrics[RTAX_MAX];
3025         struct rtmsg *rtm;
3026         struct nlmsghdr *nlh;
3027         long expires;
3028         u32 table;
3029
3030         if (prefix) {   /* user wants prefix routes only */
3031                 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3032                         /* success since this is not a prefix route */
3033                         return 1;
3034                 }
3035         }
3036
3037         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3038         if (!nlh)
3039                 return -EMSGSIZE;
3040
3041         rtm = nlmsg_data(nlh);
3042         rtm->rtm_family = AF_INET6;
3043         rtm->rtm_dst_len = rt->rt6i_dst.plen;
3044         rtm->rtm_src_len = rt->rt6i_src.plen;
3045         rtm->rtm_tos = 0;
3046         if (rt->rt6i_table)
3047                 table = rt->rt6i_table->tb6_id;
3048         else
3049                 table = RT6_TABLE_UNSPEC;
3050         rtm->rtm_table = table;
3051         if (nla_put_u32(skb, RTA_TABLE, table))
3052                 goto nla_put_failure;
3053         if (rt->rt6i_flags & RTF_REJECT) {
3054                 switch (rt->dst.error) {
3055                 case -EINVAL:
3056                         rtm->rtm_type = RTN_BLACKHOLE;
3057                         break;
3058                 case -EACCES:
3059                         rtm->rtm_type = RTN_PROHIBIT;
3060                         break;
3061                 case -EAGAIN:
3062                         rtm->rtm_type = RTN_THROW;
3063                         break;
3064                 default:
3065                         rtm->rtm_type = RTN_UNREACHABLE;
3066                         break;
3067                 }
3068         }
3069         else if (rt->rt6i_flags & RTF_LOCAL)
3070                 rtm->rtm_type = RTN_LOCAL;
3071         else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3072                 rtm->rtm_type = RTN_LOCAL;
3073         else
3074                 rtm->rtm_type = RTN_UNICAST;
3075         rtm->rtm_flags = 0;
3076         if (!netif_carrier_ok(rt->dst.dev)) {
3077                 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3078                 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3079                         rtm->rtm_flags |= RTNH_F_DEAD;
3080         }
3081         rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3082         rtm->rtm_protocol = rt->rt6i_protocol;
3083         if (rt->rt6i_flags & RTF_DYNAMIC)
3084                 rtm->rtm_protocol = RTPROT_REDIRECT;
3085         else if (rt->rt6i_flags & RTF_ADDRCONF) {
3086                 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3087                         rtm->rtm_protocol = RTPROT_RA;
3088                 else
3089                         rtm->rtm_protocol = RTPROT_KERNEL;
3090         }
3091
3092         if (rt->rt6i_flags & RTF_CACHE)
3093                 rtm->rtm_flags |= RTM_F_CLONED;
3094
3095         if (dst) {
3096                 if (nla_put_in6_addr(skb, RTA_DST, dst))
3097                         goto nla_put_failure;
3098                 rtm->rtm_dst_len = 128;
3099         } else if (rtm->rtm_dst_len)
3100                 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3101                         goto nla_put_failure;
3102 #ifdef CONFIG_IPV6_SUBTREES
3103         if (src) {
3104                 if (nla_put_in6_addr(skb, RTA_SRC, src))
3105                         goto nla_put_failure;
3106                 rtm->rtm_src_len = 128;
3107         } else if (rtm->rtm_src_len &&
3108                    nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3109                 goto nla_put_failure;
3110 #endif
3111         if (iif) {
3112 #ifdef CONFIG_IPV6_MROUTE
3113                 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3114                         int err = ip6mr_get_route(net, skb, rtm, nowait);
3115                         if (err <= 0) {
3116                                 if (!nowait) {
3117                                         if (err == 0)
3118                                                 return 0;
3119                                         goto nla_put_failure;
3120                                 } else {
3121                                         if (err == -EMSGSIZE)
3122                                                 goto nla_put_failure;
3123                                 }
3124                         }
3125                 } else
3126 #endif
3127                         if (nla_put_u32(skb, RTA_IIF, iif))
3128                                 goto nla_put_failure;
3129         } else if (dst) {
3130                 struct in6_addr saddr_buf;
3131                 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3132                     nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3133                         goto nla_put_failure;
3134         }
3135
3136         if (rt->rt6i_prefsrc.plen) {
3137                 struct in6_addr saddr_buf;
3138                 saddr_buf = rt->rt6i_prefsrc.addr;
3139                 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3140                         goto nla_put_failure;
3141         }
3142
3143         memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3144         if (rt->rt6i_pmtu)
3145                 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3146         if (rtnetlink_put_metrics(skb, metrics) < 0)
3147                 goto nla_put_failure;
3148
3149         if (rt->rt6i_flags & RTF_GATEWAY) {
3150                 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3151                         goto nla_put_failure;
3152         }
3153
3154         if (rt->dst.dev &&
3155             nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3156                 goto nla_put_failure;
3157         if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3158                 goto nla_put_failure;
3159
3160         expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3161
3162         if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3163                 goto nla_put_failure;
3164
3165         if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3166                 goto nla_put_failure;
3167
3168         lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3169
3170         nlmsg_end(skb, nlh);
3171         return 0;
3172
3173 nla_put_failure:
3174         nlmsg_cancel(skb, nlh);
3175         return -EMSGSIZE;
3176 }
3177
3178 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3179 {
3180         struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3181         int prefix;
3182
3183         if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3184                 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3185                 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3186         } else
3187                 prefix = 0;
3188
3189         return rt6_fill_node(arg->net,
3190                      arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3191                      NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3192                      prefix, 0, NLM_F_MULTI);
3193 }
3194
3195 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3196 {
3197         struct net *net = sock_net(in_skb->sk);
3198         struct nlattr *tb[RTA_MAX+1];
3199         struct rt6_info *rt;
3200         struct sk_buff *skb;
3201         struct rtmsg *rtm;
3202         struct flowi6 fl6;
3203         int err, iif = 0, oif = 0;
3204
3205         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3206         if (err < 0)
3207                 goto errout;
3208
3209         err = -EINVAL;
3210         memset(&fl6, 0, sizeof(fl6));
3211
3212         if (tb[RTA_SRC]) {
3213                 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3214                         goto errout;
3215
3216                 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3217         }
3218
3219         if (tb[RTA_DST]) {
3220                 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3221                         goto errout;
3222
3223                 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3224         }
3225
3226         if (tb[RTA_IIF])
3227                 iif = nla_get_u32(tb[RTA_IIF]);
3228
3229         if (tb[RTA_OIF])
3230                 oif = nla_get_u32(tb[RTA_OIF]);
3231
3232         if (tb[RTA_MARK])
3233                 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3234
3235         if (iif) {
3236                 struct net_device *dev;
3237                 int flags = 0;
3238
3239                 dev = __dev_get_by_index(net, iif);
3240                 if (!dev) {
3241                         err = -ENODEV;
3242                         goto errout;
3243                 }
3244
3245                 fl6.flowi6_iif = iif;
3246
3247                 if (!ipv6_addr_any(&fl6.saddr))
3248                         flags |= RT6_LOOKUP_F_HAS_SADDR;
3249
3250                 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3251                                                                flags);
3252         } else {
3253                 fl6.flowi6_oif = oif;
3254
3255                 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3256         }
3257
3258         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3259         if (!skb) {
3260                 ip6_rt_put(rt);
3261                 err = -ENOBUFS;
3262                 goto errout;
3263         }
3264
3265         /* Reserve room for dummy headers, this skb can pass
3266            through good chunk of routing engine.
3267          */
3268         skb_reset_mac_header(skb);
3269         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3270
3271         skb_dst_set(skb, &rt->dst);
3272
3273         err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3274                             RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3275                             nlh->nlmsg_seq, 0, 0, 0);
3276         if (err < 0) {
3277                 kfree_skb(skb);
3278                 goto errout;
3279         }
3280
3281         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3282 errout:
3283         return err;
3284 }
3285
3286 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3287                      unsigned int nlm_flags)
3288 {
3289         struct sk_buff *skb;
3290         struct net *net = info->nl_net;
3291         u32 seq;
3292         int err;
3293
3294         err = -ENOBUFS;
3295         seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3296
3297         skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3298         if (!skb)
3299                 goto errout;
3300
3301         err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3302                                 event, info->portid, seq, 0, 0, nlm_flags);
3303         if (err < 0) {
3304                 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3305                 WARN_ON(err == -EMSGSIZE);
3306                 kfree_skb(skb);
3307                 goto errout;
3308         }
3309         rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3310                     info->nlh, gfp_any());
3311         return;
3312 errout:
3313         if (err < 0)
3314                 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3315 }
3316
3317 static int ip6_route_dev_notify(struct notifier_block *this,
3318                                 unsigned long event, void *ptr)
3319 {
3320         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3321         struct net *net = dev_net(dev);
3322
3323         if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3324                 net->ipv6.ip6_null_entry->dst.dev = dev;
3325                 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3326 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3327                 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3328                 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3329                 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3330                 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3331 #endif
3332         }
3333
3334         return NOTIFY_OK;
3335 }
3336
3337 /*
3338  *      /proc
3339  */
3340
3341 #ifdef CONFIG_PROC_FS
3342
3343 static const struct file_operations ipv6_route_proc_fops = {
3344         .owner          = THIS_MODULE,
3345         .open           = ipv6_route_open,
3346         .read           = seq_read,
3347         .llseek         = seq_lseek,
3348         .release        = seq_release_net,
3349 };
3350
3351 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3352 {
3353         struct net *net = (struct net *)seq->private;
3354         seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3355                    net->ipv6.rt6_stats->fib_nodes,
3356                    net->ipv6.rt6_stats->fib_route_nodes,
3357                    net->ipv6.rt6_stats->fib_rt_alloc,
3358                    net->ipv6.rt6_stats->fib_rt_entries,
3359                    net->ipv6.rt6_stats->fib_rt_cache,
3360                    dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3361                    net->ipv6.rt6_stats->fib_discarded_routes);
3362
3363         return 0;
3364 }
3365
3366 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3367 {
3368         return single_open_net(inode, file, rt6_stats_seq_show);
3369 }
3370
3371 static const struct file_operations rt6_stats_seq_fops = {
3372         .owner   = THIS_MODULE,
3373         .open    = rt6_stats_seq_open,
3374         .read    = seq_read,
3375         .llseek  = seq_lseek,
3376         .release = single_release_net,
3377 };
3378 #endif  /* CONFIG_PROC_FS */
3379
3380 #ifdef CONFIG_SYSCTL
3381
3382 static
3383 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3384                               void __user *buffer, size_t *lenp, loff_t *ppos)
3385 {
3386         struct net *net;
3387         int delay;
3388         if (!write)
3389                 return -EINVAL;
3390
3391         net = (struct net *)ctl->extra1;
3392         delay = net->ipv6.sysctl.flush_delay;
3393         proc_dointvec(ctl, write, buffer, lenp, ppos);
3394         fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3395         return 0;
3396 }
3397
3398 struct ctl_table ipv6_route_table_template[] = {
3399         {
3400                 .procname       =       "flush",
3401                 .data           =       &init_net.ipv6.sysctl.flush_delay,
3402                 .maxlen         =       sizeof(int),
3403                 .mode           =       0200,
3404                 .proc_handler   =       ipv6_sysctl_rtcache_flush
3405         },
3406         {
3407                 .procname       =       "gc_thresh",
3408                 .data           =       &ip6_dst_ops_template.gc_thresh,
3409                 .maxlen         =       sizeof(int),
3410                 .mode           =       0644,
3411                 .proc_handler   =       proc_dointvec,
3412         },
3413         {
3414                 .procname       =       "max_size",
3415                 .data           =       &init_net.ipv6.sysctl.ip6_rt_max_size,
3416                 .maxlen         =       sizeof(int),
3417                 .mode           =       0644,
3418                 .proc_handler   =       proc_dointvec,
3419         },
3420         {
3421                 .procname       =       "gc_min_interval",
3422                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3423                 .maxlen         =       sizeof(int),
3424                 .mode           =       0644,
3425                 .proc_handler   =       proc_dointvec_jiffies,
3426         },
3427         {
3428                 .procname       =       "gc_timeout",
3429                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3430                 .maxlen         =       sizeof(int),
3431                 .mode           =       0644,
3432                 .proc_handler   =       proc_dointvec_jiffies,
3433         },
3434         {
3435                 .procname       =       "gc_interval",
3436                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3437                 .maxlen         =       sizeof(int),
3438                 .mode           =       0644,
3439                 .proc_handler   =       proc_dointvec_jiffies,
3440         },
3441         {
3442                 .procname       =       "gc_elasticity",
3443                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3444                 .maxlen         =       sizeof(int),
3445                 .mode           =       0644,
3446                 .proc_handler   =       proc_dointvec,
3447         },
3448         {
3449                 .procname       =       "mtu_expires",
3450                 .data           =       &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3451                 .maxlen         =       sizeof(int),
3452                 .mode           =       0644,
3453                 .proc_handler   =       proc_dointvec_jiffies,
3454         },
3455         {
3456                 .procname       =       "min_adv_mss",
3457                 .data           =       &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3458                 .maxlen         =       sizeof(int),
3459                 .mode           =       0644,
3460                 .proc_handler   =       proc_dointvec,
3461         },
3462         {
3463                 .procname       =       "gc_min_interval_ms",
3464                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3465                 .maxlen         =       sizeof(int),
3466                 .mode           =       0644,
3467                 .proc_handler   =       proc_dointvec_ms_jiffies,
3468         },
3469         { }
3470 };
3471
3472 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3473 {
3474         struct ctl_table *table;
3475
3476         table = kmemdup(ipv6_route_table_template,
3477                         sizeof(ipv6_route_table_template),
3478                         GFP_KERNEL);
3479
3480         if (table) {
3481                 table[0].data = &net->ipv6.sysctl.flush_delay;
3482                 table[0].extra1 = net;
3483                 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3484                 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3485                 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3486                 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3487                 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3488                 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3489                 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3490                 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3491                 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3492
3493                 /* Don't export sysctls to unprivileged users */
3494                 if (net->user_ns != &init_user_ns)
3495                         table[0].procname = NULL;
3496         }
3497
3498         return table;
3499 }
3500 #endif
3501
3502 static int __net_init ip6_route_net_init(struct net *net)
3503 {
3504         int ret = -ENOMEM;
3505
3506         memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3507                sizeof(net->ipv6.ip6_dst_ops));
3508
3509         if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3510                 goto out_ip6_dst_ops;
3511
3512         net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3513                                            sizeof(*net->ipv6.ip6_null_entry),
3514                                            GFP_KERNEL);
3515         if (!net->ipv6.ip6_null_entry)
3516                 goto out_ip6_dst_entries;
3517         net->ipv6.ip6_null_entry->dst.path =
3518                 (struct dst_entry *)net->ipv6.ip6_null_entry;
3519         net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3520         dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3521                          ip6_template_metrics, true);
3522
3523 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3524         net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3525                                                sizeof(*net->ipv6.ip6_prohibit_entry),
3526                                                GFP_KERNEL);
3527         if (!net->ipv6.ip6_prohibit_entry)
3528                 goto out_ip6_null_entry;
3529         net->ipv6.ip6_prohibit_entry->dst.path =
3530                 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3531         net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3532         dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3533                          ip6_template_metrics, true);
3534
3535         net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3536                                                sizeof(*net->ipv6.ip6_blk_hole_entry),
3537                                                GFP_KERNEL);
3538         if (!net->ipv6.ip6_blk_hole_entry)
3539                 goto out_ip6_prohibit_entry;
3540         net->ipv6.ip6_blk_hole_entry->dst.path =
3541                 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3542         net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3543         dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3544                          ip6_template_metrics, true);
3545 #endif
3546
3547         net->ipv6.sysctl.flush_delay = 0;
3548         net->ipv6.sysctl.ip6_rt_max_size = 4096;
3549         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3550         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3551         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3552         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3553         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3554         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3555
3556         net->ipv6.ip6_rt_gc_expire = 30*HZ;
3557
3558         ret = 0;
3559 out:
3560         return ret;
3561
3562 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3563 out_ip6_prohibit_entry:
3564         kfree(net->ipv6.ip6_prohibit_entry);
3565 out_ip6_null_entry:
3566         kfree(net->ipv6.ip6_null_entry);
3567 #endif
3568 out_ip6_dst_entries:
3569         dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3570 out_ip6_dst_ops:
3571         goto out;
3572 }
3573
3574 static void __net_exit ip6_route_net_exit(struct net *net)
3575 {
3576         kfree(net->ipv6.ip6_null_entry);
3577 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3578         kfree(net->ipv6.ip6_prohibit_entry);
3579         kfree(net->ipv6.ip6_blk_hole_entry);
3580 #endif
3581         dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3582 }
3583
3584 static int __net_init ip6_route_net_init_late(struct net *net)
3585 {
3586 #ifdef CONFIG_PROC_FS
3587         proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3588         proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3589 #endif
3590         return 0;
3591 }
3592
3593 static void __net_exit ip6_route_net_exit_late(struct net *net)
3594 {
3595 #ifdef CONFIG_PROC_FS
3596         remove_proc_entry("ipv6_route", net->proc_net);
3597         remove_proc_entry("rt6_stats", net->proc_net);
3598 #endif
3599 }
3600
3601 static struct pernet_operations ip6_route_net_ops = {
3602         .init = ip6_route_net_init,
3603         .exit = ip6_route_net_exit,
3604 };
3605
3606 static int __net_init ipv6_inetpeer_init(struct net *net)
3607 {
3608         struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3609
3610         if (!bp)
3611                 return -ENOMEM;
3612         inet_peer_base_init(bp);
3613         net->ipv6.peers = bp;
3614         return 0;
3615 }
3616
3617 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3618 {
3619         struct inet_peer_base *bp = net->ipv6.peers;
3620
3621         net->ipv6.peers = NULL;
3622         inetpeer_invalidate_tree(bp);
3623         kfree(bp);
3624 }
3625
3626 static struct pernet_operations ipv6_inetpeer_ops = {
3627         .init   =       ipv6_inetpeer_init,
3628         .exit   =       ipv6_inetpeer_exit,
3629 };
3630
3631 static struct pernet_operations ip6_route_net_late_ops = {
3632         .init = ip6_route_net_init_late,
3633         .exit = ip6_route_net_exit_late,
3634 };
3635
3636 static struct notifier_block ip6_route_dev_notifier = {
3637         .notifier_call = ip6_route_dev_notify,
3638         .priority = 0,
3639 };
3640
3641 int __init ip6_route_init(void)
3642 {
3643         int ret;
3644         int cpu;
3645
3646         ret = -ENOMEM;
3647         ip6_dst_ops_template.kmem_cachep =
3648                 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3649                                   SLAB_HWCACHE_ALIGN, NULL);
3650         if (!ip6_dst_ops_template.kmem_cachep)
3651                 goto out;
3652
3653         ret = dst_entries_init(&ip6_dst_blackhole_ops);
3654         if (ret)
3655                 goto out_kmem_cache;
3656
3657         ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3658         if (ret)
3659                 goto out_dst_entries;
3660
3661         ret = register_pernet_subsys(&ip6_route_net_ops);
3662         if (ret)
3663                 goto out_register_inetpeer;
3664
3665         ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3666
3667         /* Registering of the loopback is done before this portion of code,
3668          * the loopback reference in rt6_info will not be taken, do it
3669          * manually for init_net */
3670         init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3671         init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3672   #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3673         init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3674         init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3675         init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3676         init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3677   #endif
3678         ret = fib6_init();
3679         if (ret)
3680                 goto out_register_subsys;
3681
3682         ret = xfrm6_init();
3683         if (ret)
3684                 goto out_fib6_init;
3685
3686         ret = fib6_rules_init();
3687         if (ret)
3688                 goto xfrm6_init;
3689
3690         ret = register_pernet_subsys(&ip6_route_net_late_ops);
3691         if (ret)
3692                 goto fib6_rules_init;
3693
3694         ret = -ENOBUFS;
3695         if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3696             __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3697             __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3698                 goto out_register_late_subsys;
3699
3700         ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3701         if (ret)
3702                 goto out_register_late_subsys;
3703
3704         for_each_possible_cpu(cpu) {
3705                 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3706
3707                 INIT_LIST_HEAD(&ul->head);
3708                 spin_lock_init(&ul->lock);
3709         }
3710
3711 out:
3712         return ret;
3713
3714 out_register_late_subsys:
3715         unregister_pernet_subsys(&ip6_route_net_late_ops);
3716 fib6_rules_init:
3717         fib6_rules_cleanup();
3718 xfrm6_init:
3719         xfrm6_fini();
3720 out_fib6_init:
3721         fib6_gc_cleanup();
3722 out_register_subsys:
3723         unregister_pernet_subsys(&ip6_route_net_ops);
3724 out_register_inetpeer:
3725         unregister_pernet_subsys(&ipv6_inetpeer_ops);
3726 out_dst_entries:
3727         dst_entries_destroy(&ip6_dst_blackhole_ops);
3728 out_kmem_cache:
3729         kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3730         goto out;
3731 }
3732
3733 void ip6_route_cleanup(void)
3734 {
3735         unregister_netdevice_notifier(&ip6_route_dev_notifier);
3736         unregister_pernet_subsys(&ip6_route_net_late_ops);
3737         fib6_rules_cleanup();
3738         xfrm6_fini();
3739         fib6_gc_cleanup();
3740         unregister_pernet_subsys(&ipv6_inetpeer_ops);
3741         unregister_pernet_subsys(&ip6_route_net_ops);
3742         dst_entries_destroy(&ip6_dst_blackhole_ops);
3743         kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3744 }