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/xfrm.h>
  58 #include <net/netevent.h>
  59 #include <net/netlink.h>
  60 #include <net/nexthop.h>
  61
  62 #include <asm/uaccess.h>
  63
  64 #ifdef CONFIG_SYSCTL
  65 #include <linux/sysctl.h>
  66 #endif
  67
  68 enum rt6_nud_state {
  69         RT6_NUD_FAIL_HARD = -2,
  70         RT6_NUD_FAIL_SOFT = -1,
  71         RT6_NUD_SUCCEED = 1
  72 };
  73
  74 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
  75                                     const struct in6_addr *dest);
  76 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
  77 static unsigned int      ip6_default_advmss(const struct dst_entry *dst);
  78 static unsigned int      ip6_mtu(const struct dst_entry *dst);
  79 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
  80 static void             ip6_dst_destroy(struct dst_entry *);
  81 static void             ip6_dst_ifdown(struct dst_entry *,
  82                                        struct net_device *dev, int how);
  83 static int               ip6_dst_gc(struct dst_ops *ops);
  84
  85 static int              ip6_pkt_discard(struct sk_buff *skb);
  86 static int              ip6_pkt_discard_out(struct sk_buff *skb);
  87 static int              ip6_pkt_prohibit(struct sk_buff *skb);
  88 static int              ip6_pkt_prohibit_out(struct sk_buff *skb);
  89 static void             ip6_link_failure(struct sk_buff *skb);
  90 static void             ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
  91                                            struct sk_buff *skb, u32 mtu);
  92 static void             rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
  93                                         struct sk_buff *skb);
  94
  95 #ifdef CONFIG_IPV6_ROUTE_INFO
  96 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
  97                                            const struct in6_addr *prefix, int prefixlen,
  98                                            const struct in6_addr *gwaddr, unsigned int pref);
  99 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
 100                                            const struct in6_addr *prefix, int prefixlen,
 101                                            const struct in6_addr *gwaddr);
 102 #endif
 103
 104 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
 105 {
 106         struct rt6_info *rt = (struct rt6_info *) dst;
 107         struct inet_peer *peer;
 108         u32 *p = NULL;
 109
 110         if (!(rt->dst.flags & DST_HOST))
 111                 return NULL;
 112
 113         peer = rt6_get_peer_create(rt);
 114         if (peer) {
 115                 u32 *old_p = __DST_METRICS_PTR(old);
 116                 unsigned long prev, new;
 117
 118                 p = peer->metrics;
 119                 if (inet_metrics_new(peer))
 120                         memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
 121
 122                 new = (unsigned long) p;
 123                 prev = cmpxchg(&dst->_metrics, old, new);
 124
 125                 if (prev != old) {
 126                         p = __DST_METRICS_PTR(prev);
 127                         if (prev & DST_METRICS_READ_ONLY)
 128                                 p = NULL;
 129                 }
 130         }
 131         return p;
 132 }
 133
 134 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
 135                                              struct sk_buff *skb,
 136                                              const void *daddr)
 137 {
 138         struct in6_addr *p = &rt->rt6i_gateway;
 139
 140         if (!ipv6_addr_any(p))
 141                 return (const void *) p;
 142         else if (skb)
 143                 return &ipv6_hdr(skb)->daddr;
 144         return daddr;
 145 }
 146
 147 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
 148                                           struct sk_buff *skb,
 149                                           const void *daddr)
 150 {
 151         struct rt6_info *rt = (struct rt6_info *) dst;
 152         struct neighbour *n;
 153
 154         daddr = choose_neigh_daddr(rt, skb, daddr);
 155         n = __ipv6_neigh_lookup(dst->dev, daddr);
 156         if (n)
 157                 return n;
 158         return neigh_create(&nd_tbl, daddr, dst->dev);
 159 }
 160
 161 static struct dst_ops ip6_dst_ops_template = {
 162         .family                 =       AF_INET6,
 163         .protocol               =       cpu_to_be16(ETH_P_IPV6),
 164         .gc                     =       ip6_dst_gc,
 165         .gc_thresh              =       1024,
 166         .check                  =       ip6_dst_check,
 167         .default_advmss         =       ip6_default_advmss,
 168         .mtu                    =       ip6_mtu,
 169         .cow_metrics            =       ipv6_cow_metrics,
 170         .destroy                =       ip6_dst_destroy,
 171         .ifdown                 =       ip6_dst_ifdown,
 172         .negative_advice        =       ip6_negative_advice,
 173         .link_failure           =       ip6_link_failure,
 174         .update_pmtu            =       ip6_rt_update_pmtu,
 175         .redirect               =       rt6_do_redirect,
 176         .local_out              =       __ip6_local_out,
 177         .neigh_lookup           =       ip6_neigh_lookup,
 178 };
 179
 180 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
 181 {
 182         unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
 183
 184         return mtu ? : dst->dev->mtu;
 185 }
 186
 187 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
 188                                          struct sk_buff *skb, u32 mtu)
 189 {
 190 }
 191
 192 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
 193                                       struct sk_buff *skb)
 194 {
 195 }
 196
 197 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
 198                                          unsigned long old)
 199 {
 200         return NULL;
 201 }
 202
 203 static struct dst_ops ip6_dst_blackhole_ops = {
 204         .family                 =       AF_INET6,
 205         .protocol               =       cpu_to_be16(ETH_P_IPV6),
 206         .destroy                =       ip6_dst_destroy,
 207         .check                  =       ip6_dst_check,
 208         .mtu                    =       ip6_blackhole_mtu,
 209         .default_advmss         =       ip6_default_advmss,
 210         .update_pmtu            =       ip6_rt_blackhole_update_pmtu,
 211         .redirect               =       ip6_rt_blackhole_redirect,
 212         .cow_metrics            =       ip6_rt_blackhole_cow_metrics,
 213         .neigh_lookup           =       ip6_neigh_lookup,
 214 };
 215
 216 static const u32 ip6_template_metrics[RTAX_MAX] = {
 217         [RTAX_HOPLIMIT - 1] = 0,
 218 };
 219
 220 static const struct rt6_info ip6_null_entry_template = {
 221         .dst = {
 222                 .__refcnt       = ATOMIC_INIT(1),
 223                 .__use          = 1,
 224                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 225                 .error          = -ENETUNREACH,
 226                 .input          = ip6_pkt_discard,
 227                 .output         = ip6_pkt_discard_out,
 228         },
 229         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 230         .rt6i_protocol  = RTPROT_KERNEL,
 231         .rt6i_metric    = ~(u32) 0,
 232         .rt6i_ref       = ATOMIC_INIT(1),
 233 };
 234
 235 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
 236
 237 static const struct rt6_info ip6_prohibit_entry_template = {
 238         .dst = {
 239                 .__refcnt       = ATOMIC_INIT(1),
 240                 .__use          = 1,
 241                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 242                 .error          = -EACCES,
 243                 .input          = ip6_pkt_prohibit,
 244                 .output         = ip6_pkt_prohibit_out,
 245         },
 246         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 247         .rt6i_protocol  = RTPROT_KERNEL,
 248         .rt6i_metric    = ~(u32) 0,
 249         .rt6i_ref       = ATOMIC_INIT(1),
 250 };
 251
 252 static const struct rt6_info ip6_blk_hole_entry_template = {
 253         .dst = {
 254                 .__refcnt       = ATOMIC_INIT(1),
 255                 .__use          = 1,
 256                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 257                 .error          = -EINVAL,
 258                 .input          = dst_discard,
 259                 .output         = dst_discard,
 260         },
 261         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 262         .rt6i_protocol  = RTPROT_KERNEL,
 263         .rt6i_metric    = ~(u32) 0,
 264         .rt6i_ref       = ATOMIC_INIT(1),
 265 };
 266
 267 #endif
 268
 269 /* allocate dst with ip6_dst_ops */
 270 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
 271                                              struct net_device *dev,
 272                                              int flags,
 273                                              struct fib6_table *table)
 274 {
 275         struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
 276                                         0, DST_OBSOLETE_FORCE_CHK, flags);
 277
 278         if (rt) {
 279                 struct dst_entry *dst = &rt->dst;
 280
 281                 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
 282                 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
 283                 rt->rt6i_genid = rt_genid(net);
 284                 INIT_LIST_HEAD(&rt->rt6i_siblings);
 285                 rt->rt6i_nsiblings = 0;
 286         }
 287         return rt;
 288 }
 289
 290 static void ip6_dst_destroy(struct dst_entry *dst)
 291 {
 292         struct rt6_info *rt = (struct rt6_info *)dst;
 293         struct inet6_dev *idev = rt->rt6i_idev;
 294         struct dst_entry *from = dst->from;
 295
 296         if (!(rt->dst.flags & DST_HOST))
 297                 dst_destroy_metrics_generic(dst);
 298
 299         if (idev) {
 300                 rt->rt6i_idev = NULL;
 301                 in6_dev_put(idev);
 302         }
 303
 304         dst->from = NULL;
 305         dst_release(from);
 306
 307         if (rt6_has_peer(rt)) {
 308                 struct inet_peer *peer = rt6_peer_ptr(rt);
 309                 inet_putpeer(peer);
 310         }
 311 }
 312
 313 void rt6_bind_peer(struct rt6_info *rt, int create)
 314 {
 315         struct inet_peer_base *base;
 316         struct inet_peer *peer;
 317
 318         base = inetpeer_base_ptr(rt->_rt6i_peer);
 319         if (!base)
 320                 return;
 321
 322         peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
 323         if (peer) {
 324                 if (!rt6_set_peer(rt, peer))
 325                         inet_putpeer(peer);
 326         }
 327 }
 328
 329 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 330                            int how)
 331 {
 332         struct rt6_info *rt = (struct rt6_info *)dst;
 333         struct inet6_dev *idev = rt->rt6i_idev;
 334         struct net_device *loopback_dev =
 335                 dev_net(dev)->loopback_dev;
 336
 337         if (dev != loopback_dev) {
 338                 if (idev && idev->dev == dev) {
 339                         struct inet6_dev *loopback_idev =
 340                                 in6_dev_get(loopback_dev);
 341                         if (loopback_idev) {
 342                                 rt->rt6i_idev = loopback_idev;
 343                                 in6_dev_put(idev);
 344                         }
 345                 }
 346         }
 347 }
 348
 349 static bool rt6_check_expired(const struct rt6_info *rt)
 350 {
 351         if (rt->rt6i_flags & RTF_EXPIRES) {
 352                 if (time_after(jiffies, rt->dst.expires))
 353                         return true;
 354         } else if (rt->dst.from) {
 355                 return rt6_check_expired((struct rt6_info *) rt->dst.from);
 356         }
 357         return false;
 358 }
 359
 360 static bool rt6_need_strict(const struct in6_addr *daddr)
 361 {
 362         return ipv6_addr_type(daddr) &
 363                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 364 }
 365
 366 /* Multipath route selection:
 367  *   Hash based function using packet header and flowlabel.
 368  * Adapted from fib_info_hashfn()
 369  */
 370 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
 371                                const struct flowi6 *fl6)
 372 {
 373         unsigned int val = fl6->flowi6_proto;
 374
 375         val ^= ipv6_addr_hash(&fl6->daddr);
 376         val ^= ipv6_addr_hash(&fl6->saddr);
 377
 378         /* Work only if this not encapsulated */
 379         switch (fl6->flowi6_proto) {
 380         case IPPROTO_UDP:
 381         case IPPROTO_TCP:
 382         case IPPROTO_SCTP:
 383                 val ^= (__force u16)fl6->fl6_sport;
 384                 val ^= (__force u16)fl6->fl6_dport;
 385                 break;
 386
 387         case IPPROTO_ICMPV6:
 388                 val ^= (__force u16)fl6->fl6_icmp_type;
 389                 val ^= (__force u16)fl6->fl6_icmp_code;
 390                 break;
 391         }
 392         /* RFC6438 recommands to use flowlabel */
 393         val ^= (__force u32)fl6->flowlabel;
 394
 395         /* Perhaps, we need to tune, this function? */
 396         val = val ^ (val >> 7) ^ (val >> 12);
 397         return val % candidate_count;
 398 }
 399
 400 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
 401                                              struct flowi6 *fl6)
 402 {
 403         struct rt6_info *sibling, *next_sibling;
 404         int route_choosen;
 405
 406         route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
 407         /* Don't change the route, if route_choosen == 0
 408          * (siblings does not include ourself)
 409          */
 410         if (route_choosen)
 411                 list_for_each_entry_safe(sibling, next_sibling,
 412                                 &match->rt6i_siblings, rt6i_siblings) {
 413                         route_choosen--;
 414                         if (route_choosen == 0) {
 415                                 match = sibling;
 416                                 break;
 417                         }
 418                 }
 419         return match;
 420 }
 421
 422 /*
 423  *      Route lookup. Any table->tb6_lock is implied.
 424  */
 425
 426 static inline struct rt6_info *rt6_device_match(struct net *net,
 427                                                     struct rt6_info *rt,
 428                                                     const struct in6_addr *saddr,
 429                                                     int oif,
 430                                                     int flags)
 431 {
 432         struct rt6_info *local = NULL;
 433         struct rt6_info *sprt;
 434
 435         if (!oif && ipv6_addr_any(saddr))
 436                 goto out;
 437
 438         for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
 439                 struct net_device *dev = sprt->dst.dev;
 440
 441                 if (oif) {
 442                         if (dev->ifindex == oif)
 443                                 return sprt;
 444                         if (dev->flags & IFF_LOOPBACK) {
 445                                 if (!sprt->rt6i_idev ||
 446                                     sprt->rt6i_idev->dev->ifindex != oif) {
 447                                         if (flags & RT6_LOOKUP_F_IFACE && oif)
 448                                                 continue;
 449                                         if (local && (!oif ||
 450                                                       local->rt6i_idev->dev->ifindex == oif))
 451                                                 continue;
 452                                 }
 453                                 local = sprt;
 454                         }
 455                 } else {
 456                         if (ipv6_chk_addr(net, saddr, dev,
 457                                           flags & RT6_LOOKUP_F_IFACE))
 458                                 return sprt;
 459                 }
 460         }
 461
 462         if (oif) {
 463                 if (local)
 464                         return local;
 465
 466                 if (flags & RT6_LOOKUP_F_IFACE)
 467                         return net->ipv6.ip6_null_entry;
 468         }
 469 out:
 470         return rt;
 471 }
 472
 473 #ifdef CONFIG_IPV6_ROUTER_PREF
 474 struct __rt6_probe_work {
 475         struct work_struct work;
 476         struct in6_addr target;
 477         struct net_device *dev;
 478 };
 479
 480 static void rt6_probe_deferred(struct work_struct *w)
 481 {
 482         struct in6_addr mcaddr;
 483         struct __rt6_probe_work *work =
 484                 container_of(w, struct __rt6_probe_work, work);
 485
 486         addrconf_addr_solict_mult(&work->target, &mcaddr);
 487         ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
 488         dev_put(work->dev);
 489         kfree(w);
 490 }
 491
 492 static void rt6_probe(struct rt6_info *rt)
 493 {
 494         struct neighbour *neigh;
 495         /*
 496          * Okay, this does not seem to be appropriate
 497          * for now, however, we need to check if it
 498          * is really so; aka Router Reachability Probing.
 499          *
 500          * Router Reachability Probe MUST be rate-limited
 501          * to no more than one per minute.
 502          */
 503         if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
 504                 return;
 505         rcu_read_lock_bh();
 506         neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
 507         if (neigh) {
 508                 write_lock(&neigh->lock);
 509                 if (neigh->nud_state & NUD_VALID)
 510                         goto out;
 511         }
 512
 513         if (!neigh ||
 514             time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
 515                 struct __rt6_probe_work *work;
 516
 517                 work = kmalloc(sizeof(*work), GFP_ATOMIC);
 518
 519                 if (neigh && work)
 520                         neigh->updated = jiffies;
 521
 522                 if (neigh)
 523                         write_unlock(&neigh->lock);
 524
 525                 if (work) {
 526                         INIT_WORK(&work->work, rt6_probe_deferred);
 527                         work->target = rt->rt6i_gateway;
 528                         dev_hold(rt->dst.dev);
 529                         work->dev = rt->dst.dev;
 530                         schedule_work(&work->work);
 531                 }
 532         } else {
 533 out:
 534                 write_unlock(&neigh->lock);
 535         }
 536         rcu_read_unlock_bh();
 537 }
 538 #else
 539 static inline void rt6_probe(struct rt6_info *rt)
 540 {
 541 }
 542 #endif
 543
 544 /*
 545  * Default Router Selection (RFC 2461 6.3.6)
 546  */
 547 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
 548 {
 549         struct net_device *dev = rt->dst.dev;
 550         if (!oif || dev->ifindex == oif)
 551                 return 2;
 552         if ((dev->flags & IFF_LOOPBACK) &&
 553             rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
 554                 return 1;
 555         return 0;
 556 }
 557
 558 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
 559 {
 560         struct neighbour *neigh;
 561         enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
 562
 563         if (rt->rt6i_flags & RTF_NONEXTHOP ||
 564             !(rt->rt6i_flags & RTF_GATEWAY))
 565                 return RT6_NUD_SUCCEED;
 566
 567         rcu_read_lock_bh();
 568         neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
 569         if (neigh) {
 570                 read_lock(&neigh->lock);
 571                 if (neigh->nud_state & NUD_VALID)
 572                         ret = RT6_NUD_SUCCEED;
 573 #ifdef CONFIG_IPV6_ROUTER_PREF
 574                 else if (!(neigh->nud_state & NUD_FAILED))
 575                         ret = RT6_NUD_SUCCEED;
 576 #endif
 577                 read_unlock(&neigh->lock);
 578         } else {
 579                 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
 580                       RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
 581         }
 582         rcu_read_unlock_bh();
 583
 584         return ret;
 585 }
 586
 587 static int rt6_score_route(struct rt6_info *rt, int oif,
 588                            int strict)
 589 {
 590         int m;
 591
 592         m = rt6_check_dev(rt, oif);
 593         if (!m && (strict & RT6_LOOKUP_F_IFACE))
 594                 return RT6_NUD_FAIL_HARD;
 595 #ifdef CONFIG_IPV6_ROUTER_PREF
 596         m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
 597 #endif
 598         if (strict & RT6_LOOKUP_F_REACHABLE) {
 599                 int n = rt6_check_neigh(rt);
 600                 if (n < 0)
 601                         return n;
 602         }
 603         return m;
 604 }
 605
 606 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
 607                                    int *mpri, struct rt6_info *match,
 608                                    bool *do_rr)
 609 {
 610         int m;
 611         bool match_do_rr = false;
 612
 613         if (rt6_check_expired(rt))
 614                 goto out;
 615
 616         m = rt6_score_route(rt, oif, strict);
 617         if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
 618                 match_do_rr = true;
 619                 m = 0; /* lowest valid score */
 620         } else if (m < 0) {
 621                 goto out;
 622         }
 623
 624         if (strict & RT6_LOOKUP_F_REACHABLE)
 625                 rt6_probe(rt);
 626
 627         if (m > *mpri) {
 628                 *do_rr = match_do_rr;
 629                 *mpri = m;
 630                 match = rt;
 631         }
 632 out:
 633         return match;
 634 }
 635
 636 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
 637                                      struct rt6_info *rr_head,
 638                                      u32 metric, int oif, int strict,
 639                                      bool *do_rr)
 640 {
 641         struct rt6_info *rt, *match;
 642         int mpri = -1;
 643
 644         match = NULL;
 645         for (rt = rr_head; rt && rt->rt6i_metric == metric;
 646              rt = rt->dst.rt6_next)
 647                 match = find_match(rt, oif, strict, &mpri, match, do_rr);
 648         for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
 649              rt = rt->dst.rt6_next)
 650                 match = find_match(rt, oif, strict, &mpri, match, do_rr);
 651
 652         return match;
 653 }
 654
 655 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
 656 {
 657         struct rt6_info *match, *rt0;
 658         struct net *net;
 659         bool do_rr = false;
 660
 661         rt0 = fn->rr_ptr;
 662         if (!rt0)
 663                 fn->rr_ptr = rt0 = fn->leaf;
 664
 665         match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
 666                              &do_rr);
 667
 668         if (do_rr) {
 669                 struct rt6_info *next = rt0->dst.rt6_next;
 670
 671                 /* no entries matched; do round-robin */
 672                 if (!next || next->rt6i_metric != rt0->rt6i_metric)
 673                         next = fn->leaf;
 674
 675                 if (next != rt0)
 676                         fn->rr_ptr = next;
 677         }
 678
 679         net = dev_net(rt0->dst.dev);
 680         return match ? match : net->ipv6.ip6_null_entry;
 681 }
 682
 683 #ifdef CONFIG_IPV6_ROUTE_INFO
 684 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 685                   const struct in6_addr *gwaddr)
 686 {
 687         struct route_info *rinfo = (struct route_info *) opt;
 688         struct in6_addr prefix_buf, *prefix;
 689         unsigned int pref;
 690         unsigned long lifetime;
 691         struct rt6_info *rt;
 692
 693         if (len < sizeof(struct route_info)) {
 694                 return -EINVAL;
 695         }
 696
 697         /* Sanity check for prefix_len and length */
 698         if (rinfo->length > 3) {
 699                 return -EINVAL;
 700         } else if (rinfo->prefix_len > 128) {
 701                 return -EINVAL;
 702         } else if (rinfo->prefix_len > 64) {
 703                 if (rinfo->length < 2) {
 704                         return -EINVAL;
 705                 }
 706         } else if (rinfo->prefix_len > 0) {
 707                 if (rinfo->length < 1) {
 708                         return -EINVAL;
 709                 }
 710         }
 711
 712         pref = rinfo->route_pref;
 713         if (pref == ICMPV6_ROUTER_PREF_INVALID)
 714                 return -EINVAL;
 715
 716         lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
 717
 718         if (rinfo->length == 3)
 719                 prefix = (struct in6_addr *)rinfo->prefix;
 720         else {
 721                 /* this function is safe */
 722                 ipv6_addr_prefix(&prefix_buf,
 723                                  (struct in6_addr *)rinfo->prefix,
 724                                  rinfo->prefix_len);
 725                 prefix = &prefix_buf;
 726         }
 727
 728         if (rinfo->prefix_len == 0)
 729                 rt = rt6_get_dflt_router(gwaddr, dev);
 730         else
 731                 rt = rt6_get_route_info(dev, prefix, rinfo->prefix_len, gwaddr);
 732
 733         if (rt && !lifetime) {
 734                 ip6_del_rt(rt);
 735                 rt = NULL;
 736         }
 737
 738         if (!rt && lifetime)
 739                 rt = rt6_add_route_info(dev, prefix, rinfo->prefix_len, gwaddr, pref);
 740         else if (rt)
 741                 rt->rt6i_flags = RTF_ROUTEINFO |
 742                                  (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
 743
 744         if (rt) {
 745                 if (!addrconf_finite_timeout(lifetime))
 746                         rt6_clean_expires(rt);
 747                 else
 748                         rt6_set_expires(rt, jiffies + HZ * lifetime);
 749
 750                 ip6_rt_put(rt);
 751         }
 752         return 0;
 753 }
 754 #endif
 755
 756 #define BACKTRACK(__net, saddr)                 \
 757 do { \
 758         if (rt == __net->ipv6.ip6_null_entry) { \
 759                 struct fib6_node *pn; \
 760                 while (1) { \
 761                         if (fn->fn_flags & RTN_TL_ROOT) \
 762                                 goto out; \
 763                         pn = fn->parent; \
 764                         if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
 765                                 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
 766                         else \
 767                                 fn = pn; \
 768                         if (fn->fn_flags & RTN_RTINFO) \
 769                                 goto restart; \
 770                 } \
 771         } \
 772 } while (0)
 773
 774 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 775                                              struct fib6_table *table,
 776                                              struct flowi6 *fl6, int flags)
 777 {
 778         struct fib6_node *fn;
 779         struct rt6_info *rt;
 780
 781         read_lock_bh(&table->tb6_lock);
 782         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 783 restart:
 784         rt = fn->leaf;
 785         rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
 786         if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
 787                 rt = rt6_multipath_select(rt, fl6);
 788         BACKTRACK(net, &fl6->saddr);
 789 out:
 790         dst_use(&rt->dst, jiffies);
 791         read_unlock_bh(&table->tb6_lock);
 792         return rt;
 793
 794 }
 795
 796 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
 797                                     int flags)
 798 {
 799         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
 800 }
 801 EXPORT_SYMBOL_GPL(ip6_route_lookup);
 802
 803 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
 804                             const struct in6_addr *saddr, int oif, int strict)
 805 {
 806         struct flowi6 fl6 = {
 807                 .flowi6_oif = oif,
 808                 .daddr = *daddr,
 809         };
 810         struct dst_entry *dst;
 811         int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
 812
 813         if (saddr) {
 814                 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
 815                 flags |= RT6_LOOKUP_F_HAS_SADDR;
 816         }
 817
 818         dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
 819         if (dst->error == 0)
 820                 return (struct rt6_info *) dst;
 821
 822         dst_release(dst);
 823
 824         return NULL;
 825 }
 826
 827 EXPORT_SYMBOL(rt6_lookup);
 828
 829 /* ip6_ins_rt is called with FREE table->tb6_lock.
 830    It takes new route entry, the addition fails by any reason the
 831    route is freed. In any case, if caller does not hold it, it may
 832    be destroyed.
 833  */
 834
 835 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
 836 {
 837         int err;
 838         struct fib6_table *table;
 839
 840         table = rt->rt6i_table;
 841         write_lock_bh(&table->tb6_lock);
 842         err = fib6_add(&table->tb6_root, rt, info);
 843         write_unlock_bh(&table->tb6_lock);
 844
 845         return err;
 846 }
 847
 848 int ip6_ins_rt(struct rt6_info *rt)
 849 {
 850         struct nl_info info = {
 851                 .nl_net = dev_net(rt->dst.dev),
 852         };
 853         return __ip6_ins_rt(rt, &info);
 854 }
 855
 856 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
 857                                       const struct in6_addr *daddr,
 858                                       const struct in6_addr *saddr)
 859 {
 860         struct rt6_info *rt;
 861
 862         /*
 863          *      Clone the route.
 864          */
 865
 866         rt = ip6_rt_copy(ort, daddr);
 867
 868         if (rt) {
 869                 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
 870                         if (ort->rt6i_dst.plen != 128 &&
 871                             ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
 872                                 rt->rt6i_flags |= RTF_ANYCAST;
 873                 }
 874
 875                 rt->rt6i_flags |= RTF_CACHE;
 876
 877 #ifdef CONFIG_IPV6_SUBTREES
 878                 if (rt->rt6i_src.plen && saddr) {
 879                         rt->rt6i_src.addr = *saddr;
 880                         rt->rt6i_src.plen = 128;
 881                 }
 882 #endif
 883         }
 884
 885         return rt;
 886 }
 887
 888 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
 889                                         const struct in6_addr *daddr)
 890 {
 891         struct rt6_info *rt = ip6_rt_copy(ort, daddr);
 892
 893         if (rt)
 894                 rt->rt6i_flags |= RTF_CACHE;
 895         return rt;
 896 }
 897
 898 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
 899                                       struct flowi6 *fl6, int flags)
 900 {
 901         struct fib6_node *fn;
 902         struct rt6_info *rt, *nrt;
 903         int strict = 0;
 904         int attempts = 3;
 905         int err;
 906         int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
 907
 908         strict |= flags & RT6_LOOKUP_F_IFACE;
 909
 910 relookup:
 911         read_lock_bh(&table->tb6_lock);
 912
 913 restart_2:
 914         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 915
 916 restart:
 917         rt = rt6_select(fn, oif, strict | reachable);
 918         if (rt->rt6i_nsiblings && oif == 0)
 919                 rt = rt6_multipath_select(rt, fl6);
 920         BACKTRACK(net, &fl6->saddr);
 921         if (rt == net->ipv6.ip6_null_entry ||
 922             rt->rt6i_flags & RTF_CACHE)
 923                 goto out;
 924
 925         dst_hold(&rt->dst);
 926         read_unlock_bh(&table->tb6_lock);
 927
 928         if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
 929                 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
 930         else if (!(rt->dst.flags & DST_HOST))
 931                 nrt = rt6_alloc_clone(rt, &fl6->daddr);
 932         else
 933                 goto out2;
 934
 935         ip6_rt_put(rt);
 936         rt = nrt ? : net->ipv6.ip6_null_entry;
 937
 938         dst_hold(&rt->dst);
 939         if (nrt) {
 940                 err = ip6_ins_rt(nrt);
 941                 if (!err)
 942                         goto out2;
 943         }
 944
 945         if (--attempts <= 0)
 946                 goto out2;
 947
 948         /*
 949          * Race condition! In the gap, when table->tb6_lock was
 950          * released someone could insert this route.  Relookup.
 951          */
 952         ip6_rt_put(rt);
 953         goto relookup;
 954
 955 out:
 956         if (reachable) {
 957                 reachable = 0;
 958                 goto restart_2;
 959         }
 960         dst_hold(&rt->dst);
 961         read_unlock_bh(&table->tb6_lock);
 962 out2:
 963         rt->dst.lastuse = jiffies;
 964         rt->dst.__use++;
 965
 966         return rt;
 967 }
 968
 969 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
 970                                             struct flowi6 *fl6, int flags)
 971 {
 972         return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
 973 }
 974
 975 static struct dst_entry *ip6_route_input_lookup(struct net *net,
 976                                                 struct net_device *dev,
 977                                                 struct flowi6 *fl6, int flags)
 978 {
 979         if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
 980                 flags |= RT6_LOOKUP_F_IFACE;
 981
 982         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
 983 }
 984
 985 void ip6_route_input(struct sk_buff *skb)
 986 {
 987         const struct ipv6hdr *iph = ipv6_hdr(skb);
 988         struct net *net = dev_net(skb->dev);
 989         int flags = RT6_LOOKUP_F_HAS_SADDR;
 990         struct flowi6 fl6 = {
 991                 .flowi6_iif = skb->dev->ifindex,
 992                 .daddr = iph->daddr,
 993                 .saddr = iph->saddr,
 994                 .flowlabel = ip6_flowinfo(iph),
 995                 .flowi6_mark = skb->mark,
 996                 .flowi6_proto = iph->nexthdr,
 997         };
 998
 999         skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1000 }
1001
1002 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1003                                              struct flowi6 *fl6, int flags)
1004 {
1005         return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1006 }
1007
1008 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1009                                     struct flowi6 *fl6)
1010 {
1011         int flags = 0;
1012
1013         fl6->flowi6_iif = LOOPBACK_IFINDEX;
1014
1015         if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1016                 flags |= RT6_LOOKUP_F_IFACE;
1017
1018         if (!ipv6_addr_any(&fl6->saddr))
1019                 flags |= RT6_LOOKUP_F_HAS_SADDR;
1020         else if (sk)
1021                 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1022
1023         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1024 }
1025
1026 EXPORT_SYMBOL(ip6_route_output);
1027
1028 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1029 {
1030         struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1031         struct dst_entry *new = NULL;
1032
1033         rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1034         if (rt) {
1035                 new = &rt->dst;
1036
1037                 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1038                 rt6_init_peer(rt, net->ipv6.peers);
1039
1040                 new->__use = 1;
1041                 new->input = dst_discard;
1042                 new->output = dst_discard;
1043
1044                 if (dst_metrics_read_only(&ort->dst))
1045                         new->_metrics = ort->dst._metrics;
1046                 else
1047                         dst_copy_metrics(new, &ort->dst);
1048                 rt->rt6i_idev = ort->rt6i_idev;
1049                 if (rt->rt6i_idev)
1050                         in6_dev_hold(rt->rt6i_idev);
1051
1052                 rt->rt6i_gateway = ort->rt6i_gateway;
1053                 rt->rt6i_flags = ort->rt6i_flags;
1054                 rt->rt6i_metric = 0;
1055
1056                 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1057 #ifdef CONFIG_IPV6_SUBTREES
1058                 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1059 #endif
1060
1061                 dst_free(new);
1062         }
1063
1064         dst_release(dst_orig);
1065         return new ? new : ERR_PTR(-ENOMEM);
1066 }
1067
1068 /*
1069  *      Destination cache support functions
1070  */
1071
1072 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1073 {
1074         struct rt6_info *rt;
1075
1076         rt = (struct rt6_info *) dst;
1077
1078         /* All IPV6 dsts are created with ->obsolete set to the value
1079          * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1080          * into this function always.
1081          */
1082         if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1083                 return NULL;
1084
1085         if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1086                 return NULL;
1087
1088         if (rt6_check_expired(rt))
1089                 return NULL;
1090
1091         return dst;
1092 }
1093
1094 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1095 {
1096         struct rt6_info *rt = (struct rt6_info *) dst;
1097
1098         if (rt) {
1099                 if (rt->rt6i_flags & RTF_CACHE) {
1100                         if (rt6_check_expired(rt)) {
1101                                 ip6_del_rt(rt);
1102                                 dst = NULL;
1103                         }
1104                 } else {
1105                         dst_release(dst);
1106                         dst = NULL;
1107                 }
1108         }
1109         return dst;
1110 }
1111
1112 static void ip6_link_failure(struct sk_buff *skb)
1113 {
1114         struct rt6_info *rt;
1115
1116         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1117
1118         rt = (struct rt6_info *) skb_dst(skb);
1119         if (rt) {
1120                 if (rt->rt6i_flags & RTF_CACHE) {
1121                         dst_hold(&rt->dst);
1122                         if (ip6_del_rt(rt))
1123                                 dst_free(&rt->dst);
1124                 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1125                         rt->rt6i_node->fn_sernum = -1;
1126                 }
1127         }
1128 }
1129
1130 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1131                                struct sk_buff *skb, u32 mtu)
1132 {
1133         struct rt6_info *rt6 = (struct rt6_info*)dst;
1134
1135         dst_confirm(dst);
1136         if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1137                 struct net *net = dev_net(dst->dev);
1138
1139                 rt6->rt6i_flags |= RTF_MODIFIED;
1140                 if (mtu < IPV6_MIN_MTU) {
1141                         u32 features = dst_metric(dst, RTAX_FEATURES);
1142                         mtu = IPV6_MIN_MTU;
1143                         features |= RTAX_FEATURE_ALLFRAG;
1144                         dst_metric_set(dst, RTAX_FEATURES, features);
1145                 }
1146                 dst_metric_set(dst, RTAX_MTU, mtu);
1147                 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1148         }
1149 }
1150
1151 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1152                      int oif, u32 mark, kuid_t uid)
1153 {
1154         const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1155         struct dst_entry *dst;
1156         struct flowi6 fl6;
1157
1158         memset(&fl6, 0, sizeof(fl6));
1159         fl6.flowi6_oif = oif;
1160         fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1161         fl6.flowi6_flags = 0;
1162         fl6.daddr = iph->daddr;
1163         fl6.saddr = iph->saddr;
1164         fl6.flowlabel = ip6_flowinfo(iph);
1165         fl6.flowi6_uid = uid;
1166
1167         dst = ip6_route_output(net, NULL, &fl6);
1168         if (!dst->error)
1169                 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1170         dst_release(dst);
1171 }
1172 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1173
1174 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1175 {
1176         ip6_update_pmtu(skb, sock_net(sk), mtu,
1177                         sk->sk_bound_dev_if, sk->sk_mark, sock_i_uid(sk));
1178 }
1179 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1180
1181 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1182 {
1183         const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1184         struct dst_entry *dst;
1185         struct flowi6 fl6;
1186
1187         memset(&fl6, 0, sizeof(fl6));
1188         fl6.flowi6_oif = oif;
1189         fl6.flowi6_mark = mark;
1190         fl6.flowi6_flags = 0;
1191         fl6.daddr = iph->daddr;
1192         fl6.saddr = iph->saddr;
1193         fl6.flowlabel = ip6_flowinfo(iph);
1194
1195         dst = ip6_route_output(net, NULL, &fl6);
1196         if (!dst->error)
1197                 rt6_do_redirect(dst, NULL, skb);
1198         dst_release(dst);
1199 }
1200 EXPORT_SYMBOL_GPL(ip6_redirect);
1201
1202 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1203 {
1204         ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1205 }
1206 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1207
1208 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1209 {
1210         struct net_device *dev = dst->dev;
1211         unsigned int mtu = dst_mtu(dst);
1212         struct net *net = dev_net(dev);
1213
1214         mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1215
1216         if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1217                 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1218
1219         /*
1220          * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1221          * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1222          * IPV6_MAXPLEN is also valid and means: "any MSS,
1223          * rely only on pmtu discovery"
1224          */
1225         if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1226                 mtu = IPV6_MAXPLEN;
1227         return mtu;
1228 }
1229
1230 static unsigned int ip6_mtu(const struct dst_entry *dst)
1231 {
1232         struct inet6_dev *idev;
1233         unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1234
1235         if (mtu)
1236                 goto out;
1237
1238         mtu = IPV6_MIN_MTU;
1239
1240         rcu_read_lock();
1241         idev = __in6_dev_get(dst->dev);
1242         if (idev)
1243                 mtu = idev->cnf.mtu6;
1244         rcu_read_unlock();
1245
1246 out:
1247         return min_t(unsigned int, mtu, IP6_MAX_MTU);
1248 }
1249
1250 static struct dst_entry *icmp6_dst_gc_list;
1251 static DEFINE_SPINLOCK(icmp6_dst_lock);
1252
1253 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1254                                   struct flowi6 *fl6)
1255 {
1256         struct dst_entry *dst;
1257         struct rt6_info *rt;
1258         struct inet6_dev *idev = in6_dev_get(dev);
1259         struct net *net = dev_net(dev);
1260
1261         if (unlikely(!idev))
1262                 return ERR_PTR(-ENODEV);
1263
1264         rt = ip6_dst_alloc(net, dev, 0, NULL);
1265         if (unlikely(!rt)) {
1266                 in6_dev_put(idev);
1267                 dst = ERR_PTR(-ENOMEM);
1268                 goto out;
1269         }
1270
1271         rt->dst.flags |= DST_HOST;
1272         rt->dst.output  = ip6_output;
1273         atomic_set(&rt->dst.__refcnt, 1);
1274         rt->rt6i_gateway  = fl6->daddr;
1275         rt->rt6i_dst.addr = fl6->daddr;
1276         rt->rt6i_dst.plen = 128;
1277         rt->rt6i_idev     = idev;
1278         dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1279
1280         spin_lock_bh(&icmp6_dst_lock);
1281         rt->dst.next = icmp6_dst_gc_list;
1282         icmp6_dst_gc_list = &rt->dst;
1283         spin_unlock_bh(&icmp6_dst_lock);
1284
1285         fib6_force_start_gc(net);
1286
1287         dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1288
1289 out:
1290         return dst;
1291 }
1292
1293 int icmp6_dst_gc(void)
1294 {
1295         struct dst_entry *dst, **pprev;
1296         int more = 0;
1297
1298         spin_lock_bh(&icmp6_dst_lock);
1299         pprev = &icmp6_dst_gc_list;
1300
1301         while ((dst = *pprev) != NULL) {
1302                 if (!atomic_read(&dst->__refcnt)) {
1303                         *pprev = dst->next;
1304                         dst_free(dst);
1305                 } else {
1306                         pprev = &dst->next;
1307                         ++more;
1308                 }
1309         }
1310
1311         spin_unlock_bh(&icmp6_dst_lock);
1312
1313         return more;
1314 }
1315
1316 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1317                             void *arg)
1318 {
1319         struct dst_entry *dst, **pprev;
1320
1321         spin_lock_bh(&icmp6_dst_lock);
1322         pprev = &icmp6_dst_gc_list;
1323         while ((dst = *pprev) != NULL) {
1324                 struct rt6_info *rt = (struct rt6_info *) dst;
1325                 if (func(rt, arg)) {
1326                         *pprev = dst->next;
1327                         dst_free(dst);
1328                 } else {
1329                         pprev = &dst->next;
1330                 }
1331         }
1332         spin_unlock_bh(&icmp6_dst_lock);
1333 }
1334
1335 static int ip6_dst_gc(struct dst_ops *ops)
1336 {
1337         unsigned long now = jiffies;
1338         struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1339         int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1340         int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1341         int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1342         int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1343         unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1344         int entries;
1345
1346         entries = dst_entries_get_fast(ops);
1347         if (time_after(rt_last_gc + rt_min_interval, now) &&
1348             entries <= rt_max_size)
1349                 goto out;
1350
1351         net->ipv6.ip6_rt_gc_expire++;
1352         fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1353         net->ipv6.ip6_rt_last_gc = now;
1354         entries = dst_entries_get_slow(ops);
1355         if (entries < ops->gc_thresh)
1356                 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1357 out:
1358         net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1359         return entries > rt_max_size;
1360 }
1361
1362 int ip6_dst_hoplimit(struct dst_entry *dst)
1363 {
1364         int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1365         if (hoplimit == 0) {
1366                 struct net_device *dev = dst->dev;
1367                 struct inet6_dev *idev;
1368
1369                 rcu_read_lock();
1370                 idev = __in6_dev_get(dev);
1371                 if (idev)
1372                         hoplimit = idev->cnf.hop_limit;
1373                 else
1374                         hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1375                 rcu_read_unlock();
1376         }
1377         return hoplimit;
1378 }
1379 EXPORT_SYMBOL(ip6_dst_hoplimit);
1380
1381 /*
1382  *
1383  */
1384
1385 int ip6_route_add(struct fib6_config *cfg)
1386 {
1387         int err;
1388         struct net *net = cfg->fc_nlinfo.nl_net;
1389         struct rt6_info *rt = NULL;
1390         struct net_device *dev = NULL;
1391         struct inet6_dev *idev = NULL;
1392         struct fib6_table *table;
1393         int addr_type;
1394
1395         if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1396                 return -EINVAL;
1397 #ifndef CONFIG_IPV6_SUBTREES
1398         if (cfg->fc_src_len)
1399                 return -EINVAL;
1400 #endif
1401         if (cfg->fc_ifindex) {
1402                 err = -ENODEV;
1403                 dev = dev_get_by_index(net, cfg->fc_ifindex);
1404                 if (!dev)
1405                         goto out;
1406                 idev = in6_dev_get(dev);
1407                 if (!idev)
1408                         goto out;
1409         }
1410
1411         if (cfg->fc_metric == 0)
1412                 cfg->fc_metric = IP6_RT_PRIO_USER;
1413
1414         err = -ENOBUFS;
1415         if (cfg->fc_nlinfo.nlh &&
1416             !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1417                 table = fib6_get_table(net, cfg->fc_table);
1418                 if (!table) {
1419                         pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1420                         table = fib6_new_table(net, cfg->fc_table);
1421                 }
1422         } else {
1423                 table = fib6_new_table(net, cfg->fc_table);
1424         }
1425
1426         if (!table)
1427                 goto out;
1428
1429         rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1430
1431         if (!rt) {
1432                 err = -ENOMEM;
1433                 goto out;
1434         }
1435
1436         if (cfg->fc_flags & RTF_EXPIRES)
1437                 rt6_set_expires(rt, jiffies +
1438                                 clock_t_to_jiffies(cfg->fc_expires));
1439         else
1440                 rt6_clean_expires(rt);
1441
1442         if (cfg->fc_protocol == RTPROT_UNSPEC)
1443                 cfg->fc_protocol = RTPROT_BOOT;
1444         rt->rt6i_protocol = cfg->fc_protocol;
1445
1446         addr_type = ipv6_addr_type(&cfg->fc_dst);
1447
1448         if (addr_type & IPV6_ADDR_MULTICAST)
1449                 rt->dst.input = ip6_mc_input;
1450         else if (cfg->fc_flags & RTF_LOCAL)
1451                 rt->dst.input = ip6_input;
1452         else
1453                 rt->dst.input = ip6_forward;
1454
1455         rt->dst.output = ip6_output;
1456
1457         ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1458         rt->rt6i_dst.plen = cfg->fc_dst_len;
1459         if (rt->rt6i_dst.plen == 128)
1460                rt->dst.flags |= DST_HOST;
1461
1462         if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1463                 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1464                 if (!metrics) {
1465                         err = -ENOMEM;
1466                         goto out;
1467                 }
1468                 dst_init_metrics(&rt->dst, metrics, 0);
1469         }
1470 #ifdef CONFIG_IPV6_SUBTREES
1471         ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1472         rt->rt6i_src.plen = cfg->fc_src_len;
1473 #endif
1474
1475         rt->rt6i_metric = cfg->fc_metric;
1476
1477         /* We cannot add true routes via loopback here,
1478            they would result in kernel looping; promote them to reject routes
1479          */
1480         if ((cfg->fc_flags & RTF_REJECT) ||
1481             (dev && (dev->flags & IFF_LOOPBACK) &&
1482              !(addr_type & IPV6_ADDR_LOOPBACK) &&
1483              !(cfg->fc_flags & RTF_LOCAL))) {
1484                 /* hold loopback dev/idev if we haven't done so. */
1485                 if (dev != net->loopback_dev) {
1486                         if (dev) {
1487                                 dev_put(dev);
1488                                 in6_dev_put(idev);
1489                         }
1490                         dev = net->loopback_dev;
1491                         dev_hold(dev);
1492                         idev = in6_dev_get(dev);
1493                         if (!idev) {
1494                                 err = -ENODEV;
1495                                 goto out;
1496                         }
1497                 }
1498                 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1499                 switch (cfg->fc_type) {
1500                 case RTN_BLACKHOLE:
1501                         rt->dst.error = -EINVAL;
1502                         rt->dst.output = dst_discard;
1503                         rt->dst.input = dst_discard;
1504                         break;
1505                 case RTN_PROHIBIT:
1506                         rt->dst.error = -EACCES;
1507                         rt->dst.output = ip6_pkt_prohibit_out;
1508                         rt->dst.input = ip6_pkt_prohibit;
1509                         break;
1510                 case RTN_THROW:
1511                 default:
1512                         rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1513                                         : -ENETUNREACH;
1514                         rt->dst.output = ip6_pkt_discard_out;
1515                         rt->dst.input = ip6_pkt_discard;
1516                         break;
1517                 }
1518                 goto install_route;
1519         }
1520
1521         if (cfg->fc_flags & RTF_GATEWAY) {
1522                 const struct in6_addr *gw_addr;
1523                 int gwa_type;
1524
1525                 gw_addr = &cfg->fc_gateway;
1526                 rt->rt6i_gateway = *gw_addr;
1527                 gwa_type = ipv6_addr_type(gw_addr);
1528
1529                 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1530                         struct rt6_info *grt;
1531
1532                         /* IPv6 strictly inhibits using not link-local
1533                            addresses as nexthop address.
1534                            Otherwise, router will not able to send redirects.
1535                            It is very good, but in some (rare!) circumstances
1536                            (SIT, PtP, NBMA NOARP links) it is handy to allow
1537                            some exceptions. --ANK
1538                          */
1539                         err = -EINVAL;
1540                         if (!(gwa_type & IPV6_ADDR_UNICAST))
1541                                 goto out;
1542
1543                         grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1544
1545                         err = -EHOSTUNREACH;
1546                         if (!grt)
1547                                 goto out;
1548                         if (dev) {
1549                                 if (dev != grt->dst.dev) {
1550                                         ip6_rt_put(grt);
1551                                         goto out;
1552                                 }
1553                         } else {
1554                                 dev = grt->dst.dev;
1555                                 idev = grt->rt6i_idev;
1556                                 dev_hold(dev);
1557                                 in6_dev_hold(grt->rt6i_idev);
1558                         }
1559                         if (!(grt->rt6i_flags & RTF_GATEWAY))
1560                                 err = 0;
1561                         ip6_rt_put(grt);
1562
1563                         if (err)
1564                                 goto out;
1565                 }
1566                 err = -EINVAL;
1567                 if (!dev || (dev->flags & IFF_LOOPBACK))
1568                         goto out;
1569         }
1570
1571         err = -ENODEV;
1572         if (!dev)
1573                 goto out;
1574
1575         if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1576                 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1577                         err = -EINVAL;
1578                         goto out;
1579                 }
1580                 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1581                 rt->rt6i_prefsrc.plen = 128;
1582         } else
1583                 rt->rt6i_prefsrc.plen = 0;
1584
1585         rt->rt6i_flags = cfg->fc_flags;
1586
1587 install_route:
1588         if (cfg->fc_mx) {
1589                 struct nlattr *nla;
1590                 int remaining;
1591
1592                 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1593                         int type = nla_type(nla);
1594
1595                         if (type) {
1596                                 if (type > RTAX_MAX) {
1597                                         err = -EINVAL;
1598                                         goto out;
1599                                 }
1600
1601                                 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1602                         }
1603                 }
1604         }
1605
1606         rt->dst.dev = dev;
1607         rt->rt6i_idev = idev;
1608         rt->rt6i_table = table;
1609
1610         cfg->fc_nlinfo.nl_net = dev_net(dev);
1611
1612         return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1613
1614 out:
1615         if (dev)
1616                 dev_put(dev);
1617         if (idev)
1618                 in6_dev_put(idev);
1619         if (rt)
1620                 dst_free(&rt->dst);
1621         return err;
1622 }
1623
1624 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1625 {
1626         int err;
1627         struct fib6_table *table;
1628         struct net *net = dev_net(rt->dst.dev);
1629
1630         if (rt == net->ipv6.ip6_null_entry) {
1631                 err = -ENOENT;
1632                 goto out;
1633         }
1634
1635         table = rt->rt6i_table;
1636         write_lock_bh(&table->tb6_lock);
1637         err = fib6_del(rt, info);
1638         write_unlock_bh(&table->tb6_lock);
1639
1640 out:
1641         ip6_rt_put(rt);
1642         return err;
1643 }
1644
1645 int ip6_del_rt(struct rt6_info *rt)
1646 {
1647         struct nl_info info = {
1648                 .nl_net = dev_net(rt->dst.dev),
1649         };
1650         return __ip6_del_rt(rt, &info);
1651 }
1652
1653 static int ip6_route_del(struct fib6_config *cfg)
1654 {
1655         struct fib6_table *table;
1656         struct fib6_node *fn;
1657         struct rt6_info *rt;
1658         int err = -ESRCH;
1659
1660         table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1661         if (!table)
1662                 return err;
1663
1664         read_lock_bh(&table->tb6_lock);
1665
1666         fn = fib6_locate(&table->tb6_root,
1667                          &cfg->fc_dst, cfg->fc_dst_len,
1668                          &cfg->fc_src, cfg->fc_src_len);
1669
1670         if (fn) {
1671                 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1672                         if (cfg->fc_ifindex &&
1673                             (!rt->dst.dev ||
1674                              rt->dst.dev->ifindex != cfg->fc_ifindex))
1675                                 continue;
1676                         if (cfg->fc_flags & RTF_GATEWAY &&
1677                             !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1678                                 continue;
1679                         if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1680                                 continue;
1681                         dst_hold(&rt->dst);
1682                         read_unlock_bh(&table->tb6_lock);
1683
1684                         return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1685                 }
1686         }
1687         read_unlock_bh(&table->tb6_lock);
1688
1689         return err;
1690 }
1691
1692 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1693 {
1694         struct net *net = dev_net(skb->dev);
1695         struct netevent_redirect netevent;
1696         struct rt6_info *rt, *nrt = NULL;
1697         struct ndisc_options ndopts;
1698         struct inet6_dev *in6_dev;
1699         struct neighbour *neigh;
1700         struct rd_msg *msg;
1701         int optlen, on_link;
1702         u8 *lladdr;
1703
1704         optlen = skb->tail - skb->transport_header;
1705         optlen -= sizeof(*msg);
1706
1707         if (optlen < 0) {
1708                 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1709                 return;
1710         }
1711
1712         msg = (struct rd_msg *)icmp6_hdr(skb);
1713
1714         if (ipv6_addr_is_multicast(&msg->dest)) {
1715                 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1716                 return;
1717         }
1718
1719         on_link = 0;
1720         if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1721                 on_link = 1;
1722         } else if (ipv6_addr_type(&msg->target) !=
1723                    (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1724                 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1725                 return;
1726         }
1727
1728         in6_dev = __in6_dev_get(skb->dev);
1729         if (!in6_dev)
1730                 return;
1731         if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1732                 return;
1733
1734         /* RFC2461 8.1:
1735          *      The IP source address of the Redirect MUST be the same as the current
1736          *      first-hop router for the specified ICMP Destination Address.
1737          */
1738
1739         if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1740                 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1741                 return;
1742         }
1743
1744         lladdr = NULL;
1745         if (ndopts.nd_opts_tgt_lladdr) {
1746                 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1747                                              skb->dev);
1748                 if (!lladdr) {
1749                         net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1750                         return;
1751                 }
1752         }
1753
1754         rt = (struct rt6_info *) dst;
1755         if (rt == net->ipv6.ip6_null_entry) {
1756                 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1757                 return;
1758         }
1759
1760         /* Redirect received -> path was valid.
1761          * Look, redirects are sent only in response to data packets,
1762          * so that this nexthop apparently is reachable. --ANK
1763          */
1764         dst_confirm(&rt->dst);
1765
1766         neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1767         if (!neigh)
1768                 return;
1769
1770         /*
1771          *      We have finally decided to accept it.
1772          */
1773
1774         neigh_update(neigh, lladdr, NUD_STALE,
1775                      NEIGH_UPDATE_F_WEAK_OVERRIDE|
1776                      NEIGH_UPDATE_F_OVERRIDE|
1777                      (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1778                                      NEIGH_UPDATE_F_ISROUTER))
1779                      );
1780
1781         nrt = ip6_rt_copy(rt, &msg->dest);
1782         if (!nrt)
1783                 goto out;
1784
1785         nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1786         if (on_link)
1787                 nrt->rt6i_flags &= ~RTF_GATEWAY;
1788
1789         nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1790
1791         if (ip6_ins_rt(nrt))
1792                 goto out;
1793
1794         netevent.old = &rt->dst;
1795         netevent.new = &nrt->dst;
1796         netevent.daddr = &msg->dest;
1797         netevent.neigh = neigh;
1798         call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1799
1800         if (rt->rt6i_flags & RTF_CACHE) {
1801                 rt = (struct rt6_info *) dst_clone(&rt->dst);
1802                 ip6_del_rt(rt);
1803         }
1804
1805 out:
1806         neigh_release(neigh);
1807 }
1808
1809 /*
1810  *      Misc support functions
1811  */
1812
1813 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1814                                     const struct in6_addr *dest)
1815 {
1816         struct net *net = dev_net(ort->dst.dev);
1817         struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1818                                             ort->rt6i_table);
1819
1820         if (rt) {
1821                 rt->dst.input = ort->dst.input;
1822                 rt->dst.output = ort->dst.output;
1823                 rt->dst.flags |= DST_HOST;
1824
1825                 rt->rt6i_dst.addr = *dest;
1826                 rt->rt6i_dst.plen = 128;
1827                 dst_copy_metrics(&rt->dst, &ort->dst);
1828                 rt->dst.error = ort->dst.error;
1829                 rt->rt6i_idev = ort->rt6i_idev;
1830                 if (rt->rt6i_idev)
1831                         in6_dev_hold(rt->rt6i_idev);
1832                 rt->dst.lastuse = jiffies;
1833
1834                 if (ort->rt6i_flags & RTF_GATEWAY)
1835                         rt->rt6i_gateway = ort->rt6i_gateway;
1836                 else
1837                         rt->rt6i_gateway = *dest;
1838                 rt->rt6i_flags = ort->rt6i_flags;
1839                 rt6_set_from(rt, ort);
1840                 rt->rt6i_metric = 0;
1841
1842 #ifdef CONFIG_IPV6_SUBTREES
1843                 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1844 #endif
1845                 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1846                 rt->rt6i_table = ort->rt6i_table;
1847         }
1848         return rt;
1849 }
1850
1851 #ifdef CONFIG_IPV6_ROUTE_INFO
1852 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
1853                                            const struct in6_addr *prefix, int prefixlen,
1854                                            const struct in6_addr *gwaddr)
1855 {
1856         struct fib6_node *fn;
1857         struct rt6_info *rt = NULL;
1858         struct fib6_table *table;
1859
1860         table = fib6_get_table(dev_net(dev),
1861                                addrconf_rt_table(dev, RT6_TABLE_INFO));
1862         if (!table)
1863                 return NULL;
1864
1865         read_lock_bh(&table->tb6_lock);
1866         fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1867         if (!fn)
1868                 goto out;
1869
1870         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1871                 if (rt->dst.dev->ifindex != dev->ifindex)
1872                         continue;
1873                 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1874                         continue;
1875                 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1876                         continue;
1877                 dst_hold(&rt->dst);
1878                 break;
1879         }
1880 out:
1881         read_unlock_bh(&table->tb6_lock);
1882         return rt;
1883 }
1884
1885 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
1886                                            const struct in6_addr *prefix, int prefixlen,
1887                                            const struct in6_addr *gwaddr, unsigned int pref)
1888 {
1889         struct fib6_config cfg = {
1890                 .fc_table       = addrconf_rt_table(dev, RT6_TABLE_INFO),
1891                 .fc_metric      = IP6_RT_PRIO_USER,
1892                 .fc_ifindex     = dev->ifindex,
1893                 .fc_dst_len     = prefixlen,
1894                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1895                                   RTF_UP | RTF_PREF(pref),
1896                 .fc_nlinfo.portid = 0,
1897                 .fc_nlinfo.nlh = NULL,
1898                 .fc_nlinfo.nl_net = dev_net(dev),
1899         };
1900
1901         cfg.fc_dst = *prefix;
1902         cfg.fc_gateway = *gwaddr;
1903
1904         /* We should treat it as a default route if prefix length is 0. */
1905         if (!prefixlen)
1906                 cfg.fc_flags |= RTF_DEFAULT;
1907
1908         ip6_route_add(&cfg);
1909
1910         return rt6_get_route_info(dev, prefix, prefixlen, gwaddr);
1911 }
1912 #endif
1913
1914 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1915 {
1916         struct rt6_info *rt;
1917         struct fib6_table *table;
1918
1919         table = fib6_get_table(dev_net(dev),
1920                                addrconf_rt_table(dev, RT6_TABLE_MAIN));
1921         if (!table)
1922                 return NULL;
1923
1924         read_lock_bh(&table->tb6_lock);
1925         for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1926                 if (dev == rt->dst.dev &&
1927                     ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1928                     ipv6_addr_equal(&rt->rt6i_gateway, addr))
1929                         break;
1930         }
1931         if (rt)
1932                 dst_hold(&rt->dst);
1933         read_unlock_bh(&table->tb6_lock);
1934         return rt;
1935 }
1936
1937 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1938                                      struct net_device *dev,
1939                                      unsigned int pref)
1940 {
1941         struct fib6_config cfg = {
1942                 .fc_table       = addrconf_rt_table(dev, RT6_TABLE_DFLT),
1943                 .fc_metric      = IP6_RT_PRIO_USER,
1944                 .fc_ifindex     = dev->ifindex,
1945                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1946                                   RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1947                 .fc_nlinfo.portid = 0,
1948                 .fc_nlinfo.nlh = NULL,
1949                 .fc_nlinfo.nl_net = dev_net(dev),
1950         };
1951
1952         cfg.fc_gateway = *gwaddr;
1953
1954         ip6_route_add(&cfg);
1955
1956         return rt6_get_dflt_router(gwaddr, dev);
1957 }
1958
1959
1960 int rt6_addrconf_purge(struct rt6_info *rt, void *arg) {
1961         if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
1962             (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2))
1963                 return -1;
1964         return 0;
1965 }
1966
1967 void rt6_purge_dflt_routers(struct net *net)
1968 {
1969         fib6_clean_all(net, rt6_addrconf_purge, 0, NULL);
1970 }
1971
1972 static void rtmsg_to_fib6_config(struct net *net,
1973                                  struct in6_rtmsg *rtmsg,
1974                                  struct fib6_config *cfg)
1975 {
1976         memset(cfg, 0, sizeof(*cfg));
1977
1978         cfg->fc_table = RT6_TABLE_MAIN;
1979         cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1980         cfg->fc_metric = rtmsg->rtmsg_metric;
1981         cfg->fc_expires = rtmsg->rtmsg_info;
1982         cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1983         cfg->fc_src_len = rtmsg->rtmsg_src_len;
1984         cfg->fc_flags = rtmsg->rtmsg_flags;
1985
1986         cfg->fc_nlinfo.nl_net = net;
1987
1988         cfg->fc_dst = rtmsg->rtmsg_dst;
1989         cfg->fc_src = rtmsg->rtmsg_src;
1990         cfg->fc_gateway = rtmsg->rtmsg_gateway;
1991 }
1992
1993 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1994 {
1995         struct fib6_config cfg;
1996         struct in6_rtmsg rtmsg;
1997         int err;
1998
1999         switch(cmd) {
2000         case SIOCADDRT:         /* Add a route */
2001         case SIOCDELRT:         /* Delete a route */
2002                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2003                         return -EPERM;
2004                 err = copy_from_user(&rtmsg, arg,
2005                                      sizeof(struct in6_rtmsg));
2006                 if (err)
2007                         return -EFAULT;
2008
2009                 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2010
2011                 rtnl_lock();
2012                 switch (cmd) {
2013                 case SIOCADDRT:
2014                         err = ip6_route_add(&cfg);
2015                         break;
2016                 case SIOCDELRT:
2017                         err = ip6_route_del(&cfg);
2018                         break;
2019                 default:
2020                         err = -EINVAL;
2021                 }
2022                 rtnl_unlock();
2023
2024                 return err;
2025         }
2026
2027         return -EINVAL;
2028 }
2029
2030 /*
2031  *      Drop the packet on the floor
2032  */
2033
2034 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2035 {
2036         int type;
2037         struct dst_entry *dst = skb_dst(skb);
2038         switch (ipstats_mib_noroutes) {
2039         case IPSTATS_MIB_INNOROUTES:
2040                 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2041                 if (type == IPV6_ADDR_ANY) {
2042                         IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2043                                       IPSTATS_MIB_INADDRERRORS);
2044                         break;
2045                 }
2046                 /* FALLTHROUGH */
2047         case IPSTATS_MIB_OUTNOROUTES:
2048                 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2049                               ipstats_mib_noroutes);
2050                 break;
2051         }
2052         icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2053         kfree_skb(skb);
2054         return 0;
2055 }
2056
2057 static int ip6_pkt_discard(struct sk_buff *skb)
2058 {
2059         return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2060 }
2061
2062 static int ip6_pkt_discard_out(struct sk_buff *skb)
2063 {
2064         skb->dev = skb_dst(skb)->dev;
2065         return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2066 }
2067
2068 static int ip6_pkt_prohibit(struct sk_buff *skb)
2069 {
2070         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2071 }
2072
2073 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2074 {
2075         skb->dev = skb_dst(skb)->dev;
2076         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2077 }
2078
2079 /*
2080  *      Allocate a dst for local (unicast / anycast) address.
2081  */
2082
2083 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2084                                     const struct in6_addr *addr,
2085                                     bool anycast)
2086 {
2087         struct net *net = dev_net(idev->dev);
2088         struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2089                                             DST_NOCOUNT, NULL);
2090         if (!rt)
2091                 return ERR_PTR(-ENOMEM);
2092
2093         in6_dev_hold(idev);
2094
2095         rt->dst.flags |= DST_HOST;
2096         rt->dst.input = ip6_input;
2097         rt->dst.output = ip6_output;
2098         rt->rt6i_idev = idev;
2099
2100         rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2101         if (anycast)
2102                 rt->rt6i_flags |= RTF_ANYCAST;
2103         else
2104                 rt->rt6i_flags |= RTF_LOCAL;
2105
2106         rt->rt6i_gateway  = *addr;
2107         rt->rt6i_dst.addr = *addr;
2108         rt->rt6i_dst.plen = 128;
2109         rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2110
2111         atomic_set(&rt->dst.__refcnt, 1);
2112
2113         return rt;
2114 }
2115
2116 int ip6_route_get_saddr(struct net *net,
2117                         struct rt6_info *rt,
2118                         const struct in6_addr *daddr,
2119                         unsigned int prefs,
2120                         struct in6_addr *saddr)
2121 {
2122         struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2123         int err = 0;
2124         if (rt->rt6i_prefsrc.plen)
2125                 *saddr = rt->rt6i_prefsrc.addr;
2126         else
2127                 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2128                                          daddr, prefs, saddr);
2129         return err;
2130 }
2131
2132 /* remove deleted ip from prefsrc entries */
2133 struct arg_dev_net_ip {
2134         struct net_device *dev;
2135         struct net *net;
2136         struct in6_addr *addr;
2137 };
2138
2139 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2140 {
2141         struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2142         struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2143         struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2144
2145         if (((void *)rt->dst.dev == dev || !dev) &&
2146             rt != net->ipv6.ip6_null_entry &&
2147             ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2148                 /* remove prefsrc entry */
2149                 rt->rt6i_prefsrc.plen = 0;
2150         }
2151         return 0;
2152 }
2153
2154 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2155 {
2156         struct net *net = dev_net(ifp->idev->dev);
2157         struct arg_dev_net_ip adni = {
2158                 .dev = ifp->idev->dev,
2159                 .net = net,
2160                 .addr = &ifp->addr,
2161         };
2162         fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2163 }
2164
2165 struct arg_dev_net {
2166         struct net_device *dev;
2167         struct net *net;
2168 };
2169
2170 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2171 {
2172         const struct arg_dev_net *adn = arg;
2173         const struct net_device *dev = adn->dev;
2174
2175         if ((rt->dst.dev == dev || !dev) &&
2176             rt != adn->net->ipv6.ip6_null_entry)
2177                 return -1;
2178
2179         return 0;
2180 }
2181
2182 void rt6_ifdown(struct net *net, struct net_device *dev)
2183 {
2184         struct arg_dev_net adn = {
2185                 .dev = dev,
2186                 .net = net,
2187         };
2188
2189         fib6_clean_all(net, fib6_ifdown, 0, &adn);
2190         icmp6_clean_all(fib6_ifdown, &adn);
2191 }
2192
2193 struct rt6_mtu_change_arg {
2194         struct net_device *dev;
2195         unsigned int mtu;
2196 };
2197
2198 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2199 {
2200         struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2201         struct inet6_dev *idev;
2202
2203         /* In IPv6 pmtu discovery is not optional,
2204            so that RTAX_MTU lock cannot disable it.
2205            We still use this lock to block changes
2206            caused by addrconf/ndisc.
2207         */
2208
2209         idev = __in6_dev_get(arg->dev);
2210         if (!idev)
2211                 return 0;
2212
2213         /* For administrative MTU increase, there is no way to discover
2214            IPv6 PMTU increase, so PMTU increase should be updated here.
2215            Since RFC 1981 doesn't include administrative MTU increase
2216            update PMTU increase is a MUST. (i.e. jumbo frame)
2217          */
2218         /*
2219            If new MTU is less than route PMTU, this new MTU will be the
2220            lowest MTU in the path, update the route PMTU to reflect PMTU
2221            decreases; if new MTU is greater than route PMTU, and the
2222            old MTU is the lowest MTU in the path, update the route PMTU
2223            to reflect the increase. In this case if the other nodes' MTU
2224            also have the lowest MTU, TOO BIG MESSAGE will be lead to
2225            PMTU discouvery.
2226          */
2227         if (rt->dst.dev == arg->dev &&
2228             !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2229             (dst_mtu(&rt->dst) >= arg->mtu ||
2230              (dst_mtu(&rt->dst) < arg->mtu &&
2231               dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2232                 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2233         }
2234         return 0;
2235 }
2236
2237 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2238 {
2239         struct rt6_mtu_change_arg arg = {
2240                 .dev = dev,
2241                 .mtu = mtu,
2242         };
2243
2244         fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2245 }
2246
2247 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2248         [RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
2249         [RTA_OIF]               = { .type = NLA_U32 },
2250         [RTA_IIF]               = { .type = NLA_U32 },
2251         [RTA_PRIORITY]          = { .type = NLA_U32 },
2252         [RTA_METRICS]           = { .type = NLA_NESTED },
2253         [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
2254         [RTA_UID]               = { .type = NLA_U32 },
2255 };
2256
2257 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2258                               struct fib6_config *cfg)
2259 {
2260         struct rtmsg *rtm;
2261         struct nlattr *tb[RTA_MAX+1];
2262         int err;
2263
2264         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2265         if (err < 0)
2266                 goto errout;
2267
2268         err = -EINVAL;
2269         rtm = nlmsg_data(nlh);
2270         memset(cfg, 0, sizeof(*cfg));
2271
2272         cfg->fc_table = rtm->rtm_table;
2273         cfg->fc_dst_len = rtm->rtm_dst_len;
2274         cfg->fc_src_len = rtm->rtm_src_len;
2275         cfg->fc_flags = RTF_UP;
2276         cfg->fc_protocol = rtm->rtm_protocol;
2277         cfg->fc_type = rtm->rtm_type;
2278
2279         if (rtm->rtm_type == RTN_UNREACHABLE ||
2280             rtm->rtm_type == RTN_BLACKHOLE ||
2281             rtm->rtm_type == RTN_PROHIBIT ||
2282             rtm->rtm_type == RTN_THROW)
2283                 cfg->fc_flags |= RTF_REJECT;
2284
2285         if (rtm->rtm_type == RTN_LOCAL)
2286                 cfg->fc_flags |= RTF_LOCAL;
2287
2288         cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2289         cfg->fc_nlinfo.nlh = nlh;
2290         cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2291
2292         if (tb[RTA_GATEWAY]) {
2293                 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2294                 cfg->fc_flags |= RTF_GATEWAY;
2295         }
2296
2297         if (tb[RTA_DST]) {
2298                 int plen = (rtm->rtm_dst_len + 7) >> 3;
2299
2300                 if (nla_len(tb[RTA_DST]) < plen)
2301                         goto errout;
2302
2303                 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2304         }
2305
2306         if (tb[RTA_SRC]) {
2307                 int plen = (rtm->rtm_src_len + 7) >> 3;
2308
2309                 if (nla_len(tb[RTA_SRC]) < plen)
2310                         goto errout;
2311
2312                 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2313         }
2314
2315         if (tb[RTA_PREFSRC])
2316                 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2317
2318         if (tb[RTA_OIF])
2319                 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2320
2321         if (tb[RTA_PRIORITY])
2322                 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2323
2324         if (tb[RTA_METRICS]) {
2325                 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2326                 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2327         }
2328
2329         if (tb[RTA_TABLE])
2330                 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2331
2332         if (tb[RTA_MULTIPATH]) {
2333                 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2334                 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2335         }
2336
2337         err = 0;
2338 errout:
2339         return err;
2340 }
2341
2342 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2343 {
2344         struct fib6_config r_cfg;
2345         struct rtnexthop *rtnh;
2346         int remaining;
2347         int attrlen;
2348         int err = 0, last_err = 0;
2349
2350 beginning:
2351         rtnh = (struct rtnexthop *)cfg->fc_mp;
2352         remaining = cfg->fc_mp_len;
2353
2354         /* Parse a Multipath Entry */
2355         while (rtnh_ok(rtnh, remaining)) {
2356                 memcpy(&r_cfg, cfg, sizeof(*cfg));
2357                 if (rtnh->rtnh_ifindex)
2358                         r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2359
2360                 attrlen = rtnh_attrlen(rtnh);
2361                 if (attrlen > 0) {
2362                         struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2363
2364                         nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2365                         if (nla) {
2366                                 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2367                                 r_cfg.fc_flags |= RTF_GATEWAY;
2368                         }
2369                 }
2370                 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2371                 if (err) {
2372                         last_err = err;
2373                         /* If we are trying to remove a route, do not stop the
2374                          * loop when ip6_route_del() fails (because next hop is
2375                          * already gone), we should try to remove all next hops.
2376                          */
2377                         if (add) {
2378                                 /* If add fails, we should try to delete all
2379                                  * next hops that have been already added.
2380                                  */
2381                                 add = 0;
2382                                 goto beginning;
2383                         }
2384                 }
2385                 /* Because each route is added like a single route we remove
2386                  * this flag after the first nexthop (if there is a collision,
2387                  * we have already fail to add the first nexthop:
2388                  * fib6_add_rt2node() has reject it).
2389                  */
2390                 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2391                 rtnh = rtnh_next(rtnh, &remaining);
2392         }
2393
2394         return last_err;
2395 }
2396
2397 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2398 {
2399         struct fib6_config cfg;
2400         int err;
2401
2402         err = rtm_to_fib6_config(skb, nlh, &cfg);
2403         if (err < 0)
2404                 return err;
2405
2406         if (cfg.fc_mp)
2407                 return ip6_route_multipath(&cfg, 0);
2408         else
2409                 return ip6_route_del(&cfg);
2410 }
2411
2412 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2413 {
2414         struct fib6_config cfg;
2415         int err;
2416
2417         err = rtm_to_fib6_config(skb, nlh, &cfg);
2418         if (err < 0)
2419                 return err;
2420
2421         if (cfg.fc_mp)
2422                 return ip6_route_multipath(&cfg, 1);
2423         else
2424                 return ip6_route_add(&cfg);
2425 }
2426
2427 static inline size_t rt6_nlmsg_size(void)
2428 {
2429         return NLMSG_ALIGN(sizeof(struct rtmsg))
2430                + nla_total_size(16) /* RTA_SRC */
2431                + nla_total_size(16) /* RTA_DST */
2432                + nla_total_size(16) /* RTA_GATEWAY */
2433                + nla_total_size(16) /* RTA_PREFSRC */
2434                + nla_total_size(4) /* RTA_TABLE */
2435                + nla_total_size(4) /* RTA_IIF */
2436                + nla_total_size(4) /* RTA_OIF */
2437                + nla_total_size(4) /* RTA_PRIORITY */
2438                + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2439                + nla_total_size(sizeof(struct rta_cacheinfo));
2440 }
2441
2442 static int rt6_fill_node(struct net *net,
2443                          struct sk_buff *skb, struct rt6_info *rt,
2444                          struct in6_addr *dst, struct in6_addr *src,
2445                          int iif, int type, u32 portid, u32 seq,
2446                          int prefix, int nowait, unsigned int flags)
2447 {
2448         struct rtmsg *rtm;
2449         struct nlmsghdr *nlh;
2450         long expires;
2451         u32 table;
2452
2453         if (prefix) {   /* user wants prefix routes only */
2454                 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2455                         /* success since this is not a prefix route */
2456                         return 1;
2457                 }
2458         }
2459
2460         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2461         if (!nlh)
2462                 return -EMSGSIZE;
2463
2464         rtm = nlmsg_data(nlh);
2465         rtm->rtm_family = AF_INET6;
2466         rtm->rtm_dst_len = rt->rt6i_dst.plen;
2467         rtm->rtm_src_len = rt->rt6i_src.plen;
2468         rtm->rtm_tos = 0;
2469         if (rt->rt6i_table)
2470                 table = rt->rt6i_table->tb6_id;
2471         else
2472                 table = RT6_TABLE_UNSPEC;
2473         rtm->rtm_table = table;
2474         if (nla_put_u32(skb, RTA_TABLE, table))
2475                 goto nla_put_failure;
2476         if (rt->rt6i_flags & RTF_REJECT) {
2477                 switch (rt->dst.error) {
2478                 case -EINVAL:
2479                         rtm->rtm_type = RTN_BLACKHOLE;
2480                         break;
2481                 case -EACCES:
2482                         rtm->rtm_type = RTN_PROHIBIT;
2483                         break;
2484                 case -EAGAIN:
2485                         rtm->rtm_type = RTN_THROW;
2486                         break;
2487                 default:
2488                         rtm->rtm_type = RTN_UNREACHABLE;
2489                         break;
2490                 }
2491         }
2492         else if (rt->rt6i_flags & RTF_LOCAL)
2493                 rtm->rtm_type = RTN_LOCAL;
2494         else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2495                 rtm->rtm_type = RTN_LOCAL;
2496         else
2497                 rtm->rtm_type = RTN_UNICAST;
2498         rtm->rtm_flags = 0;
2499         rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2500         rtm->rtm_protocol = rt->rt6i_protocol;
2501         if (rt->rt6i_flags & RTF_DYNAMIC)
2502                 rtm->rtm_protocol = RTPROT_REDIRECT;
2503         else if (rt->rt6i_flags & RTF_ADDRCONF) {
2504                 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2505                         rtm->rtm_protocol = RTPROT_RA;
2506                 else
2507                         rtm->rtm_protocol = RTPROT_KERNEL;
2508         }
2509
2510         if (rt->rt6i_flags & RTF_CACHE)
2511                 rtm->rtm_flags |= RTM_F_CLONED;
2512
2513         if (dst) {
2514                 if (nla_put(skb, RTA_DST, 16, dst))
2515                         goto nla_put_failure;
2516                 rtm->rtm_dst_len = 128;
2517         } else if (rtm->rtm_dst_len)
2518                 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2519                         goto nla_put_failure;
2520 #ifdef CONFIG_IPV6_SUBTREES
2521         if (src) {
2522                 if (nla_put(skb, RTA_SRC, 16, src))
2523                         goto nla_put_failure;
2524                 rtm->rtm_src_len = 128;
2525         } else if (rtm->rtm_src_len &&
2526                    nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2527                 goto nla_put_failure;
2528 #endif
2529         if (iif) {
2530 #ifdef CONFIG_IPV6_MROUTE
2531                 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2532                         int err = ip6mr_get_route(net, skb, rtm, nowait);
2533                         if (err <= 0) {
2534                                 if (!nowait) {
2535                                         if (err == 0)
2536                                                 return 0;
2537                                         goto nla_put_failure;
2538                                 } else {
2539                                         if (err == -EMSGSIZE)
2540                                                 goto nla_put_failure;
2541                                 }
2542                         }
2543                 } else
2544 #endif
2545                         if (nla_put_u32(skb, RTA_IIF, iif))
2546                                 goto nla_put_failure;
2547         } else if (dst) {
2548                 struct in6_addr saddr_buf;
2549                 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2550                     nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2551                         goto nla_put_failure;
2552         }
2553
2554         if (rt->rt6i_prefsrc.plen) {
2555                 struct in6_addr saddr_buf;
2556                 saddr_buf = rt->rt6i_prefsrc.addr;
2557                 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2558                         goto nla_put_failure;
2559         }
2560
2561         if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2562                 goto nla_put_failure;
2563
2564         if (rt->rt6i_flags & RTF_GATEWAY) {
2565                 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2566                         goto nla_put_failure;
2567         }
2568
2569         if (rt->dst.dev &&
2570             nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2571                 goto nla_put_failure;
2572         if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2573                 goto nla_put_failure;
2574
2575         expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2576
2577         if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2578                 goto nla_put_failure;
2579
2580         return nlmsg_end(skb, nlh);
2581
2582 nla_put_failure:
2583         nlmsg_cancel(skb, nlh);
2584         return -EMSGSIZE;
2585 }
2586
2587 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2588 {
2589         struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2590         int prefix;
2591
2592         if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2593                 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2594                 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2595         } else
2596                 prefix = 0;
2597
2598         return rt6_fill_node(arg->net,
2599                      arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2600                      NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2601                      prefix, 0, NLM_F_MULTI);
2602 }
2603
2604 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2605 {
2606         struct net *net = sock_net(in_skb->sk);
2607         struct nlattr *tb[RTA_MAX+1];
2608         struct rt6_info *rt;
2609         struct sk_buff *skb;
2610         struct rtmsg *rtm;
2611         struct flowi6 fl6;
2612         int err, iif = 0, oif = 0;
2613
2614         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2615         if (err < 0)
2616                 goto errout;
2617
2618         err = -EINVAL;
2619         memset(&fl6, 0, sizeof(fl6));
2620
2621         if (tb[RTA_SRC]) {
2622                 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2623                         goto errout;
2624
2625                 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2626         }
2627
2628         if (tb[RTA_DST]) {
2629                 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2630                         goto errout;
2631
2632                 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2633         }
2634
2635         if (tb[RTA_IIF])
2636                 iif = nla_get_u32(tb[RTA_IIF]);
2637
2638         if (tb[RTA_OIF])
2639                 oif = nla_get_u32(tb[RTA_OIF]);
2640
2641         if (tb[RTA_UID])
2642                 fl6.flowi6_uid = make_kuid(current_user_ns(),
2643                                            nla_get_u32(tb[RTA_UID]));
2644         else
2645                 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
2646
2647         if (iif) {
2648                 struct net_device *dev;
2649                 int flags = 0;
2650
2651                 dev = __dev_get_by_index(net, iif);
2652                 if (!dev) {
2653                         err = -ENODEV;
2654                         goto errout;
2655                 }
2656
2657                 fl6.flowi6_iif = iif;
2658
2659                 if (!ipv6_addr_any(&fl6.saddr))
2660                         flags |= RT6_LOOKUP_F_HAS_SADDR;
2661
2662                 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2663                                                                flags);
2664         } else {
2665                 fl6.flowi6_oif = oif;
2666
2667                 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2668         }
2669
2670         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2671         if (!skb) {
2672                 ip6_rt_put(rt);
2673                 err = -ENOBUFS;
2674                 goto errout;
2675         }
2676
2677         /* Reserve room for dummy headers, this skb can pass
2678            through good chunk of routing engine.
2679          */
2680         skb_reset_mac_header(skb);
2681         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2682
2683         skb_dst_set(skb, &rt->dst);
2684
2685         err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2686                             RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2687                             nlh->nlmsg_seq, 0, 0, 0);
2688         if (err < 0) {
2689                 kfree_skb(skb);
2690                 goto errout;
2691         }
2692
2693         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2694 errout:
2695         return err;
2696 }
2697
2698 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2699 {
2700         struct sk_buff *skb;
2701         struct net *net = info->nl_net;
2702         u32 seq;
2703         int err;
2704
2705         err = -ENOBUFS;
2706         seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2707
2708         skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2709         if (!skb)
2710                 goto errout;
2711
2712         err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2713                                 event, info->portid, seq, 0, 0, 0);
2714         if (err < 0) {
2715                 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2716                 WARN_ON(err == -EMSGSIZE);
2717                 kfree_skb(skb);
2718                 goto errout;
2719         }
2720         rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2721                     info->nlh, gfp_any());
2722         return;
2723 errout:
2724         if (err < 0)
2725                 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2726 }
2727
2728 static int ip6_route_dev_notify(struct notifier_block *this,
2729                                 unsigned long event, void *data)
2730 {
2731         struct net_device *dev = (struct net_device *)data;
2732         struct net *net = dev_net(dev);
2733
2734         if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2735                 net->ipv6.ip6_null_entry->dst.dev = dev;
2736                 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2737 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2738                 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2739                 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2740                 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2741                 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2742 #endif
2743         }
2744
2745         return NOTIFY_OK;
2746 }
2747
2748 /*
2749  *      /proc
2750  */
2751
2752 #ifdef CONFIG_PROC_FS
2753
2754 struct rt6_proc_arg
2755 {
2756         char *buffer;
2757         int offset;
2758         int length;
2759         int skip;
2760         int len;
2761 };
2762
2763 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2764 {
2765         struct seq_file *m = p_arg;
2766
2767         seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2768
2769 #ifdef CONFIG_IPV6_SUBTREES
2770         seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2771 #else
2772         seq_puts(m, "00000000000000000000000000000000 00 ");
2773 #endif
2774         if (rt->rt6i_flags & RTF_GATEWAY) {
2775                 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2776         } else {
2777                 seq_puts(m, "00000000000000000000000000000000");
2778         }
2779         seq_printf(m, " %08x %08x %08x %08x %8s\n",
2780                    rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2781                    rt->dst.__use, rt->rt6i_flags,
2782                    rt->dst.dev ? rt->dst.dev->name : "");
2783         return 0;
2784 }
2785
2786 static int ipv6_route_show(struct seq_file *m, void *v)
2787 {
2788         struct net *net = (struct net *)m->private;
2789         fib6_clean_all_ro(net, rt6_info_route, 0, m);
2790         return 0;
2791 }
2792
2793 static int ipv6_route_open(struct inode *inode, struct file *file)
2794 {
2795         return single_open_net(inode, file, ipv6_route_show);
2796 }
2797
2798 static const struct file_operations ipv6_route_proc_fops = {
2799         .owner          = THIS_MODULE,
2800         .open           = ipv6_route_open,
2801         .read           = seq_read,
2802         .llseek         = seq_lseek,
2803         .release        = single_release_net,
2804 };
2805
2806 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2807 {
2808         struct net *net = (struct net *)seq->private;
2809         seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2810                    net->ipv6.rt6_stats->fib_nodes,
2811                    net->ipv6.rt6_stats->fib_route_nodes,
2812                    net->ipv6.rt6_stats->fib_rt_alloc,
2813                    net->ipv6.rt6_stats->fib_rt_entries,
2814                    net->ipv6.rt6_stats->fib_rt_cache,
2815                    dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2816                    net->ipv6.rt6_stats->fib_discarded_routes);
2817
2818         return 0;
2819 }
2820
2821 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2822 {
2823         return single_open_net(inode, file, rt6_stats_seq_show);
2824 }
2825
2826 static const struct file_operations rt6_stats_seq_fops = {
2827         .owner   = THIS_MODULE,
2828         .open    = rt6_stats_seq_open,
2829         .read    = seq_read,
2830         .llseek  = seq_lseek,
2831         .release = single_release_net,
2832 };
2833 #endif  /* CONFIG_PROC_FS */
2834
2835 #ifdef CONFIG_SYSCTL
2836
2837 static
2838 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2839                               void __user *buffer, size_t *lenp, loff_t *ppos)
2840 {
2841         struct net *net;
2842         int delay;
2843         if (!write)
2844                 return -EINVAL;
2845
2846         net = (struct net *)ctl->extra1;
2847         delay = net->ipv6.sysctl.flush_delay;
2848         proc_dointvec(ctl, write, buffer, lenp, ppos);
2849         fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2850         return 0;
2851 }
2852
2853 ctl_table ipv6_route_table_template[] = {
2854         {
2855                 .procname       =       "flush",
2856                 .data           =       &init_net.ipv6.sysctl.flush_delay,
2857                 .maxlen         =       sizeof(int),
2858                 .mode           =       0200,
2859                 .proc_handler   =       ipv6_sysctl_rtcache_flush
2860         },
2861         {
2862                 .procname       =       "gc_thresh",
2863                 .data           =       &ip6_dst_ops_template.gc_thresh,
2864                 .maxlen         =       sizeof(int),
2865                 .mode           =       0644,
2866                 .proc_handler   =       proc_dointvec,
2867         },
2868         {
2869                 .procname       =       "max_size",
2870                 .data           =       &init_net.ipv6.sysctl.ip6_rt_max_size,
2871                 .maxlen         =       sizeof(int),
2872                 .mode           =       0644,
2873                 .proc_handler   =       proc_dointvec,
2874         },
2875         {
2876                 .procname       =       "gc_min_interval",
2877                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2878                 .maxlen         =       sizeof(int),
2879                 .mode           =       0644,
2880                 .proc_handler   =       proc_dointvec_jiffies,
2881         },
2882         {
2883                 .procname       =       "gc_timeout",
2884                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2885                 .maxlen         =       sizeof(int),
2886                 .mode           =       0644,
2887                 .proc_handler   =       proc_dointvec_jiffies,
2888         },
2889         {
2890                 .procname       =       "gc_interval",
2891                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2892                 .maxlen         =       sizeof(int),
2893                 .mode           =       0644,
2894                 .proc_handler   =       proc_dointvec_jiffies,
2895         },
2896         {
2897                 .procname       =       "gc_elasticity",
2898                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2899                 .maxlen         =       sizeof(int),
2900                 .mode           =       0644,
2901                 .proc_handler   =       proc_dointvec,
2902         },
2903         {
2904                 .procname       =       "mtu_expires",
2905                 .data           =       &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2906                 .maxlen         =       sizeof(int),
2907                 .mode           =       0644,
2908                 .proc_handler   =       proc_dointvec_jiffies,
2909         },
2910         {
2911                 .procname       =       "min_adv_mss",
2912                 .data           =       &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2913                 .maxlen         =       sizeof(int),
2914                 .mode           =       0644,
2915                 .proc_handler   =       proc_dointvec,
2916         },
2917         {
2918                 .procname       =       "gc_min_interval_ms",
2919                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2920                 .maxlen         =       sizeof(int),
2921                 .mode           =       0644,
2922                 .proc_handler   =       proc_dointvec_ms_jiffies,
2923         },
2924         { }
2925 };
2926
2927 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2928 {
2929         struct ctl_table *table;
2930
2931         table = kmemdup(ipv6_route_table_template,
2932                         sizeof(ipv6_route_table_template),
2933                         GFP_KERNEL);
2934
2935         if (table) {
2936                 table[0].data = &net->ipv6.sysctl.flush_delay;
2937                 table[0].extra1 = net;
2938                 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2939                 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2940                 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2941                 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2942                 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2943                 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2944                 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2945                 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2946                 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2947
2948                 /* Don't export sysctls to unprivileged users */
2949                 if (net->user_ns != &init_user_ns)
2950                         table[0].procname = NULL;
2951         }
2952
2953         return table;
2954 }
2955 #endif
2956
2957 static int __net_init ip6_route_net_init(struct net *net)
2958 {
2959         int ret = -ENOMEM;
2960
2961         memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2962                sizeof(net->ipv6.ip6_dst_ops));
2963
2964         if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2965                 goto out_ip6_dst_ops;
2966
2967         net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2968                                            sizeof(*net->ipv6.ip6_null_entry),
2969                                            GFP_KERNEL);
2970         if (!net->ipv6.ip6_null_entry)
2971                 goto out_ip6_dst_entries;
2972         net->ipv6.ip6_null_entry->dst.path =
2973                 (struct dst_entry *)net->ipv6.ip6_null_entry;
2974         net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2975         dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2976                          ip6_template_metrics, true);
2977
2978 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2979         net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2980                                                sizeof(*net->ipv6.ip6_prohibit_entry),
2981                                                GFP_KERNEL);
2982         if (!net->ipv6.ip6_prohibit_entry)
2983                 goto out_ip6_null_entry;
2984         net->ipv6.ip6_prohibit_entry->dst.path =
2985                 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2986         net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2987         dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2988                          ip6_template_metrics, true);
2989
2990         net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2991                                                sizeof(*net->ipv6.ip6_blk_hole_entry),
2992                                                GFP_KERNEL);
2993         if (!net->ipv6.ip6_blk_hole_entry)
2994                 goto out_ip6_prohibit_entry;
2995         net->ipv6.ip6_blk_hole_entry->dst.path =
2996                 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2997         net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2998         dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
2999                          ip6_template_metrics, true);
3000 #endif
3001
3002         net->ipv6.sysctl.flush_delay = 0;
3003         net->ipv6.sysctl.ip6_rt_max_size = 4096;
3004         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3005         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3006         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3007         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3008         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3009         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3010
3011         net->ipv6.ip6_rt_gc_expire = 30*HZ;
3012
3013         ret = 0;
3014 out:
3015         return ret;
3016
3017 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3018 out_ip6_prohibit_entry:
3019         kfree(net->ipv6.ip6_prohibit_entry);
3020 out_ip6_null_entry:
3021         kfree(net->ipv6.ip6_null_entry);
3022 #endif
3023 out_ip6_dst_entries:
3024         dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3025 out_ip6_dst_ops:
3026         goto out;
3027 }
3028
3029 static void __net_exit ip6_route_net_exit(struct net *net)
3030 {
3031         kfree(net->ipv6.ip6_null_entry);
3032 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3033         kfree(net->ipv6.ip6_prohibit_entry);
3034         kfree(net->ipv6.ip6_blk_hole_entry);
3035 #endif
3036         dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3037 }
3038
3039 static int __net_init ip6_route_net_init_late(struct net *net)
3040 {
3041 #ifdef CONFIG_PROC_FS
3042         proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3043         proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3044 #endif
3045         return 0;
3046 }
3047
3048 static void __net_exit ip6_route_net_exit_late(struct net *net)
3049 {
3050 #ifdef CONFIG_PROC_FS
3051         remove_proc_entry("ipv6_route", net->proc_net);
3052         remove_proc_entry("rt6_stats", net->proc_net);
3053 #endif
3054 }
3055
3056 static struct pernet_operations ip6_route_net_ops = {
3057         .init = ip6_route_net_init,
3058         .exit = ip6_route_net_exit,
3059 };
3060
3061 static int __net_init ipv6_inetpeer_init(struct net *net)
3062 {
3063         struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3064
3065         if (!bp)
3066                 return -ENOMEM;
3067         inet_peer_base_init(bp);
3068         net->ipv6.peers = bp;
3069         return 0;
3070 }
3071
3072 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3073 {
3074         struct inet_peer_base *bp = net->ipv6.peers;
3075
3076         net->ipv6.peers = NULL;
3077         inetpeer_invalidate_tree(bp);
3078         kfree(bp);
3079 }
3080
3081 static struct pernet_operations ipv6_inetpeer_ops = {
3082         .init   =       ipv6_inetpeer_init,
3083         .exit   =       ipv6_inetpeer_exit,
3084 };
3085
3086 static struct pernet_operations ip6_route_net_late_ops = {
3087         .init = ip6_route_net_init_late,
3088         .exit = ip6_route_net_exit_late,
3089 };
3090
3091 static struct notifier_block ip6_route_dev_notifier = {
3092         .notifier_call = ip6_route_dev_notify,
3093         .priority = 0,
3094 };
3095
3096 int __init ip6_route_init(void)
3097 {
3098         int ret;
3099
3100         ret = -ENOMEM;
3101         ip6_dst_ops_template.kmem_cachep =
3102                 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3103                                   SLAB_HWCACHE_ALIGN, NULL);
3104         if (!ip6_dst_ops_template.kmem_cachep)
3105                 goto out;
3106
3107         ret = dst_entries_init(&ip6_dst_blackhole_ops);
3108         if (ret)
3109                 goto out_kmem_cache;
3110
3111         ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3112         if (ret)
3113                 goto out_dst_entries;
3114
3115         ret = register_pernet_subsys(&ip6_route_net_ops);
3116         if (ret)
3117                 goto out_register_inetpeer;
3118
3119         ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3120
3121         /* Registering of the loopback is done before this portion of code,
3122          * the loopback reference in rt6_info will not be taken, do it
3123          * manually for init_net */
3124         init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3125         init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3126   #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3127         init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3128         init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3129         init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3130         init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3131   #endif
3132         ret = fib6_init();
3133         if (ret)
3134                 goto out_register_subsys;
3135
3136         ret = xfrm6_init();
3137         if (ret)
3138                 goto out_fib6_init;
3139
3140         ret = fib6_rules_init();
3141         if (ret)
3142                 goto xfrm6_init;
3143
3144         ret = register_pernet_subsys(&ip6_route_net_late_ops);
3145         if (ret)
3146                 goto fib6_rules_init;
3147
3148         ret = -ENOBUFS;
3149         if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3150             __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3151             __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3152                 goto out_register_late_subsys;
3153
3154         ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3155         if (ret)
3156                 goto out_register_late_subsys;
3157
3158 out:
3159         return ret;
3160
3161 out_register_late_subsys:
3162         unregister_pernet_subsys(&ip6_route_net_late_ops);
3163 fib6_rules_init:
3164         fib6_rules_cleanup();
3165 xfrm6_init:
3166         xfrm6_fini();
3167 out_fib6_init:
3168         fib6_gc_cleanup();
3169 out_register_subsys:
3170         unregister_pernet_subsys(&ip6_route_net_ops);
3171 out_register_inetpeer:
3172         unregister_pernet_subsys(&ipv6_inetpeer_ops);
3173 out_dst_entries:
3174         dst_entries_destroy(&ip6_dst_blackhole_ops);
3175 out_kmem_cache:
3176         kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3177         goto out;
3178 }
3179
3180 void ip6_route_cleanup(void)
3181 {
3182         unregister_netdevice_notifier(&ip6_route_dev_notifier);
3183         unregister_pernet_subsys(&ip6_route_net_late_ops);
3184         fib6_rules_cleanup();
3185         xfrm6_fini();
3186         fib6_gc_cleanup();
3187         unregister_pernet_subsys(&ipv6_inetpeer_ops);
3188         unregister_pernet_subsys(&ip6_route_net_ops);
3189         dst_entries_destroy(&ip6_dst_blackhole_ops);
3190         kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3191 }