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 void             ip6_link_failure(struct sk_buff *skb);
  88 static void             ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
  89                                            struct sk_buff *skb, u32 mtu);
  90 static void             rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
  91                                         struct sk_buff *skb);
  92 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
  93
  94 #ifdef CONFIG_IPV6_ROUTE_INFO
  95 static struct rt6_info *rt6_add_route_info(struct net *net,
  96                                            const struct in6_addr *prefix, int prefixlen,
  97                                            const struct in6_addr *gwaddr, int ifindex,
  98                                            unsigned int pref);
  99 static struct rt6_info *rt6_get_route_info(struct net *net,
 100                                            const struct in6_addr *prefix, int prefixlen,
 101                                            const struct in6_addr *gwaddr, int ifindex);
 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 int ip6_pkt_prohibit(struct sk_buff *skb);
 238 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
 239
 240 static const struct rt6_info ip6_prohibit_entry_template = {
 241         .dst = {
 242                 .__refcnt       = ATOMIC_INIT(1),
 243                 .__use          = 1,
 244                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 245                 .error          = -EACCES,
 246                 .input          = ip6_pkt_prohibit,
 247                 .output         = ip6_pkt_prohibit_out,
 248         },
 249         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 250         .rt6i_protocol  = RTPROT_KERNEL,
 251         .rt6i_metric    = ~(u32) 0,
 252         .rt6i_ref       = ATOMIC_INIT(1),
 253 };
 254
 255 static const struct rt6_info ip6_blk_hole_entry_template = {
 256         .dst = {
 257                 .__refcnt       = ATOMIC_INIT(1),
 258                 .__use          = 1,
 259                 .obsolete       = DST_OBSOLETE_FORCE_CHK,
 260                 .error          = -EINVAL,
 261                 .input          = dst_discard,
 262                 .output         = dst_discard,
 263         },
 264         .rt6i_flags     = (RTF_REJECT | RTF_NONEXTHOP),
 265         .rt6i_protocol  = RTPROT_KERNEL,
 266         .rt6i_metric    = ~(u32) 0,
 267         .rt6i_ref       = ATOMIC_INIT(1),
 268 };
 269
 270 #endif
 271
 272 /* allocate dst with ip6_dst_ops */
 273 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
 274                                              struct net_device *dev,
 275                                              int flags,
 276                                              struct fib6_table *table)
 277 {
 278         struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
 279                                         0, DST_OBSOLETE_FORCE_CHK, flags);
 280
 281         if (rt) {
 282                 struct dst_entry *dst = &rt->dst;
 283
 284                 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
 285                 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
 286                 rt->rt6i_genid = rt_genid_ipv6(net);
 287                 INIT_LIST_HEAD(&rt->rt6i_siblings);
 288         }
 289         return rt;
 290 }
 291
 292 static void ip6_dst_destroy(struct dst_entry *dst)
 293 {
 294         struct rt6_info *rt = (struct rt6_info *)dst;
 295         struct inet6_dev *idev = rt->rt6i_idev;
 296         struct dst_entry *from = dst->from;
 297
 298         if (!(rt->dst.flags & DST_HOST))
 299                 dst_destroy_metrics_generic(dst);
 300
 301         if (idev) {
 302                 rt->rt6i_idev = NULL;
 303                 in6_dev_put(idev);
 304         }
 305
 306         dst->from = NULL;
 307         dst_release(from);
 308
 309         if (rt6_has_peer(rt)) {
 310                 struct inet_peer *peer = rt6_peer_ptr(rt);
 311                 inet_putpeer(peer);
 312         }
 313 }
 314
 315 void rt6_bind_peer(struct rt6_info *rt, int create)
 316 {
 317         struct inet_peer_base *base;
 318         struct inet_peer *peer;
 319
 320         base = inetpeer_base_ptr(rt->_rt6i_peer);
 321         if (!base)
 322                 return;
 323
 324         peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
 325         if (peer) {
 326                 if (!rt6_set_peer(rt, peer))
 327                         inet_putpeer(peer);
 328         }
 329 }
 330
 331 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 332                            int how)
 333 {
 334         struct rt6_info *rt = (struct rt6_info *)dst;
 335         struct inet6_dev *idev = rt->rt6i_idev;
 336         struct net_device *loopback_dev =
 337                 dev_net(dev)->loopback_dev;
 338
 339         if (dev != loopback_dev) {
 340                 if (idev && idev->dev == dev) {
 341                         struct inet6_dev *loopback_idev =
 342                                 in6_dev_get(loopback_dev);
 343                         if (loopback_idev) {
 344                                 rt->rt6i_idev = loopback_idev;
 345                                 in6_dev_put(idev);
 346                         }
 347                 }
 348         }
 349 }
 350
 351 static bool rt6_check_expired(const struct rt6_info *rt)
 352 {
 353         if (rt->rt6i_flags & RTF_EXPIRES) {
 354                 if (time_after(jiffies, rt->dst.expires))
 355                         return true;
 356         } else if (rt->dst.from) {
 357                 return rt6_check_expired((struct rt6_info *) rt->dst.from);
 358         }
 359         return false;
 360 }
 361
 362 static bool rt6_need_strict(const struct in6_addr *daddr)
 363 {
 364         return ipv6_addr_type(daddr) &
 365                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
 366 }
 367
 368 /* Multipath route selection:
 369  *   Hash based function using packet header and flowlabel.
 370  * Adapted from fib_info_hashfn()
 371  */
 372 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
 373                                const struct flowi6 *fl6)
 374 {
 375         unsigned int val = fl6->flowi6_proto;
 376
 377         val ^= ipv6_addr_hash(&fl6->daddr);
 378         val ^= ipv6_addr_hash(&fl6->saddr);
 379
 380         /* Work only if this not encapsulated */
 381         switch (fl6->flowi6_proto) {
 382         case IPPROTO_UDP:
 383         case IPPROTO_TCP:
 384         case IPPROTO_SCTP:
 385                 val ^= (__force u16)fl6->fl6_sport;
 386                 val ^= (__force u16)fl6->fl6_dport;
 387                 break;
 388
 389         case IPPROTO_ICMPV6:
 390                 val ^= (__force u16)fl6->fl6_icmp_type;
 391                 val ^= (__force u16)fl6->fl6_icmp_code;
 392                 break;
 393         }
 394         /* RFC6438 recommands to use flowlabel */
 395         val ^= (__force u32)fl6->flowlabel;
 396
 397         /* Perhaps, we need to tune, this function? */
 398         val = val ^ (val >> 7) ^ (val >> 12);
 399         return val % candidate_count;
 400 }
 401
 402 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
 403                                              struct flowi6 *fl6, int oif,
 404                                              int strict)
 405 {
 406         struct rt6_info *sibling, *next_sibling;
 407         int route_choosen;
 408
 409         route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
 410         /* Don't change the route, if route_choosen == 0
 411          * (siblings does not include ourself)
 412          */
 413         if (route_choosen)
 414                 list_for_each_entry_safe(sibling, next_sibling,
 415                                 &match->rt6i_siblings, rt6i_siblings) {
 416                         route_choosen--;
 417                         if (route_choosen == 0) {
 418                                 if (rt6_score_route(sibling, oif, strict) < 0)
 419                                         break;
 420                                 match = sibling;
 421                                 break;
 422                         }
 423                 }
 424         return match;
 425 }
 426
 427 /*
 428  *      Route lookup. Any table->tb6_lock is implied.
 429  */
 430
 431 static inline struct rt6_info *rt6_device_match(struct net *net,
 432                                                     struct rt6_info *rt,
 433                                                     const struct in6_addr *saddr,
 434                                                     int oif,
 435                                                     int flags)
 436 {
 437         struct rt6_info *local = NULL;
 438         struct rt6_info *sprt;
 439
 440         if (!oif && ipv6_addr_any(saddr))
 441                 goto out;
 442
 443         for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
 444                 struct net_device *dev = sprt->dst.dev;
 445
 446                 if (oif) {
 447                         if (dev->ifindex == oif)
 448                                 return sprt;
 449                         if (dev->flags & IFF_LOOPBACK) {
 450                                 if (!sprt->rt6i_idev ||
 451                                     sprt->rt6i_idev->dev->ifindex != oif) {
 452                                         if (flags & RT6_LOOKUP_F_IFACE && oif)
 453                                                 continue;
 454                                         if (local && (!oif ||
 455                                                       local->rt6i_idev->dev->ifindex == oif))
 456                                                 continue;
 457                                 }
 458                                 local = sprt;
 459                         }
 460                 } else {
 461                         if (ipv6_chk_addr(net, saddr, dev,
 462                                           flags & RT6_LOOKUP_F_IFACE))
 463                                 return sprt;
 464                 }
 465         }
 466
 467         if (oif) {
 468                 if (local)
 469                         return local;
 470
 471                 if (flags & RT6_LOOKUP_F_IFACE)
 472                         return net->ipv6.ip6_null_entry;
 473         }
 474 out:
 475         return rt;
 476 }
 477
 478 #ifdef CONFIG_IPV6_ROUTER_PREF
 479 static void rt6_probe(struct rt6_info *rt)
 480 {
 481         struct neighbour *neigh;
 482         /*
 483          * Okay, this does not seem to be appropriate
 484          * for now, however, we need to check if it
 485          * is really so; aka Router Reachability Probing.
 486          *
 487          * Router Reachability Probe MUST be rate-limited
 488          * to no more than one per minute.
 489          */
 490         if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
 491                 return;
 492         rcu_read_lock_bh();
 493         neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
 494         if (neigh) {
 495                 write_lock(&neigh->lock);
 496                 if (neigh->nud_state & NUD_VALID)
 497                         goto out;
 498         }
 499
 500         if (!neigh ||
 501             time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
 502                 struct in6_addr mcaddr;
 503                 struct in6_addr *target;
 504
 505                 if (neigh) {
 506                         neigh->updated = jiffies;
 507                         write_unlock(&neigh->lock);
 508                 }
 509
 510                 target = (struct in6_addr *)&rt->rt6i_gateway;
 511                 addrconf_addr_solict_mult(target, &mcaddr);
 512                 ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);
 513         } else {
 514 out:
 515                 write_unlock(&neigh->lock);
 516         }
 517         rcu_read_unlock_bh();
 518 }
 519 #else
 520 static inline void rt6_probe(struct rt6_info *rt)
 521 {
 522 }
 523 #endif
 524
 525 /*
 526  * Default Router Selection (RFC 2461 6.3.6)
 527  */
 528 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
 529 {
 530         struct net_device *dev = rt->dst.dev;
 531         if (!oif || dev->ifindex == oif)
 532                 return 2;
 533         if ((dev->flags & IFF_LOOPBACK) &&
 534             rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
 535                 return 1;
 536         return 0;
 537 }
 538
 539 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
 540 {
 541         struct neighbour *neigh;
 542         enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
 543
 544         if (rt->rt6i_flags & RTF_NONEXTHOP ||
 545             !(rt->rt6i_flags & RTF_GATEWAY))
 546                 return RT6_NUD_SUCCEED;
 547
 548         rcu_read_lock_bh();
 549         neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
 550         if (neigh) {
 551                 read_lock(&neigh->lock);
 552                 if (neigh->nud_state & NUD_VALID)
 553                         ret = RT6_NUD_SUCCEED;
 554 #ifdef CONFIG_IPV6_ROUTER_PREF
 555                 else if (!(neigh->nud_state & NUD_FAILED))
 556                         ret = RT6_NUD_SUCCEED;
 557 #endif
 558                 read_unlock(&neigh->lock);
 559         } else {
 560                 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
 561                       RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
 562         }
 563         rcu_read_unlock_bh();
 564
 565         return ret;
 566 }
 567
 568 static int rt6_score_route(struct rt6_info *rt, int oif,
 569                            int strict)
 570 {
 571         int m;
 572
 573         m = rt6_check_dev(rt, oif);
 574         if (!m && (strict & RT6_LOOKUP_F_IFACE))
 575                 return RT6_NUD_FAIL_HARD;
 576 #ifdef CONFIG_IPV6_ROUTER_PREF
 577         m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
 578 #endif
 579         if (strict & RT6_LOOKUP_F_REACHABLE) {
 580                 int n = rt6_check_neigh(rt);
 581                 if (n < 0)
 582                         return n;
 583         }
 584         return m;
 585 }
 586
 587 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
 588                                    int *mpri, struct rt6_info *match,
 589                                    bool *do_rr)
 590 {
 591         int m;
 592         bool match_do_rr = false;
 593
 594         if (rt6_check_expired(rt))
 595                 goto out;
 596
 597         m = rt6_score_route(rt, oif, strict);
 598         if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
 599                 match_do_rr = true;
 600                 m = 0; /* lowest valid score */
 601         } else if (m < 0) {
 602                 goto out;
 603         }
 604
 605         if (strict & RT6_LOOKUP_F_REACHABLE)
 606                 rt6_probe(rt);
 607
 608         if (m > *mpri) {
 609                 *do_rr = match_do_rr;
 610                 *mpri = m;
 611                 match = rt;
 612         }
 613 out:
 614         return match;
 615 }
 616
 617 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
 618                                      struct rt6_info *rr_head,
 619                                      u32 metric, int oif, int strict,
 620                                      bool *do_rr)
 621 {
 622         struct rt6_info *rt, *match;
 623         int mpri = -1;
 624
 625         match = NULL;
 626         for (rt = rr_head; rt && rt->rt6i_metric == metric;
 627              rt = rt->dst.rt6_next)
 628                 match = find_match(rt, oif, strict, &mpri, match, do_rr);
 629         for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
 630              rt = rt->dst.rt6_next)
 631                 match = find_match(rt, oif, strict, &mpri, match, do_rr);
 632
 633         return match;
 634 }
 635
 636 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
 637 {
 638         struct rt6_info *match, *rt0;
 639         struct net *net;
 640         bool do_rr = false;
 641
 642         rt0 = fn->rr_ptr;
 643         if (!rt0)
 644                 fn->rr_ptr = rt0 = fn->leaf;
 645
 646         match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
 647                              &do_rr);
 648
 649         if (do_rr) {
 650                 struct rt6_info *next = rt0->dst.rt6_next;
 651
 652                 /* no entries matched; do round-robin */
 653                 if (!next || next->rt6i_metric != rt0->rt6i_metric)
 654                         next = fn->leaf;
 655
 656                 if (next != rt0)
 657                         fn->rr_ptr = next;
 658         }
 659
 660         net = dev_net(rt0->dst.dev);
 661         return match ? match : net->ipv6.ip6_null_entry;
 662 }
 663
 664 #ifdef CONFIG_IPV6_ROUTE_INFO
 665 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 666                   const struct in6_addr *gwaddr)
 667 {
 668         struct net *net = dev_net(dev);
 669         struct route_info *rinfo = (struct route_info *) opt;
 670         struct in6_addr prefix_buf, *prefix;
 671         unsigned int pref;
 672         unsigned long lifetime;
 673         struct rt6_info *rt;
 674
 675         if (len < sizeof(struct route_info)) {
 676                 return -EINVAL;
 677         }
 678
 679         /* Sanity check for prefix_len and length */
 680         if (rinfo->length > 3) {
 681                 return -EINVAL;
 682         } else if (rinfo->prefix_len > 128) {
 683                 return -EINVAL;
 684         } else if (rinfo->prefix_len > 64) {
 685                 if (rinfo->length < 2) {
 686                         return -EINVAL;
 687                 }
 688         } else if (rinfo->prefix_len > 0) {
 689                 if (rinfo->length < 1) {
 690                         return -EINVAL;
 691                 }
 692         }
 693
 694         pref = rinfo->route_pref;
 695         if (pref == ICMPV6_ROUTER_PREF_INVALID)
 696                 return -EINVAL;
 697
 698         lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
 699
 700         if (rinfo->length == 3)
 701                 prefix = (struct in6_addr *)rinfo->prefix;
 702         else {
 703                 /* this function is safe */
 704                 ipv6_addr_prefix(&prefix_buf,
 705                                  (struct in6_addr *)rinfo->prefix,
 706                                  rinfo->prefix_len);
 707                 prefix = &prefix_buf;
 708         }
 709
 710         rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
 711                                 dev->ifindex);
 712
 713         if (rt && !lifetime) {
 714                 ip6_del_rt(rt);
 715                 rt = NULL;
 716         }
 717
 718         if (!rt && lifetime)
 719                 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
 720                                         pref);
 721         else if (rt)
 722                 rt->rt6i_flags = RTF_ROUTEINFO |
 723                                  (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
 724
 725         if (rt) {
 726                 if (!addrconf_finite_timeout(lifetime))
 727                         rt6_clean_expires(rt);
 728                 else
 729                         rt6_set_expires(rt, jiffies + HZ * lifetime);
 730
 731                 ip6_rt_put(rt);
 732         }
 733         return 0;
 734 }
 735 #endif
 736
 737 #define BACKTRACK(__net, saddr)                 \
 738 do { \
 739         if (rt == __net->ipv6.ip6_null_entry) { \
 740                 struct fib6_node *pn; \
 741                 while (1) { \
 742                         if (fn->fn_flags & RTN_TL_ROOT) \
 743                                 goto out; \
 744                         pn = fn->parent; \
 745                         if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
 746                                 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
 747                         else \
 748                                 fn = pn; \
 749                         if (fn->fn_flags & RTN_RTINFO) \
 750                                 goto restart; \
 751                 } \
 752         } \
 753 } while (0)
 754
 755 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 756                                              struct fib6_table *table,
 757                                              struct flowi6 *fl6, int flags)
 758 {
 759         struct fib6_node *fn;
 760         struct rt6_info *rt;
 761
 762         read_lock_bh(&table->tb6_lock);
 763         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 764 restart:
 765         rt = fn->leaf;
 766         rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
 767         if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
 768                 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
 769         BACKTRACK(net, &fl6->saddr);
 770 out:
 771         dst_use(&rt->dst, jiffies);
 772         read_unlock_bh(&table->tb6_lock);
 773         return rt;
 774
 775 }
 776
 777 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
 778                                     int flags)
 779 {
 780         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
 781 }
 782 EXPORT_SYMBOL_GPL(ip6_route_lookup);
 783
 784 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
 785                             const struct in6_addr *saddr, int oif, int strict)
 786 {
 787         struct flowi6 fl6 = {
 788                 .flowi6_oif = oif,
 789                 .daddr = *daddr,
 790         };
 791         struct dst_entry *dst;
 792         int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
 793
 794         if (saddr) {
 795                 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
 796                 flags |= RT6_LOOKUP_F_HAS_SADDR;
 797         }
 798
 799         dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
 800         if (dst->error == 0)
 801                 return (struct rt6_info *) dst;
 802
 803         dst_release(dst);
 804
 805         return NULL;
 806 }
 807
 808 EXPORT_SYMBOL(rt6_lookup);
 809
 810 /* ip6_ins_rt is called with FREE table->tb6_lock.
 811    It takes new route entry, the addition fails by any reason the
 812    route is freed. In any case, if caller does not hold it, it may
 813    be destroyed.
 814  */
 815
 816 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
 817 {
 818         int err;
 819         struct fib6_table *table;
 820
 821         table = rt->rt6i_table;
 822         write_lock_bh(&table->tb6_lock);
 823         err = fib6_add(&table->tb6_root, rt, info);
 824         write_unlock_bh(&table->tb6_lock);
 825
 826         return err;
 827 }
 828
 829 int ip6_ins_rt(struct rt6_info *rt)
 830 {
 831         struct nl_info info = {
 832                 .nl_net = dev_net(rt->dst.dev),
 833         };
 834         return __ip6_ins_rt(rt, &info);
 835 }
 836
 837 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
 838                                       const struct in6_addr *daddr,
 839                                       const struct in6_addr *saddr)
 840 {
 841         struct rt6_info *rt;
 842
 843         /*
 844          *      Clone the route.
 845          */
 846
 847         rt = ip6_rt_copy(ort, daddr);
 848
 849         if (rt) {
 850                 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
 851                         if (ort->rt6i_dst.plen != 128 &&
 852                             ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
 853                                 rt->rt6i_flags |= RTF_ANYCAST;
 854                 }
 855
 856                 rt->rt6i_flags |= RTF_CACHE;
 857
 858 #ifdef CONFIG_IPV6_SUBTREES
 859                 if (rt->rt6i_src.plen && saddr) {
 860                         rt->rt6i_src.addr = *saddr;
 861                         rt->rt6i_src.plen = 128;
 862                 }
 863 #endif
 864         }
 865
 866         return rt;
 867 }
 868
 869 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
 870                                         const struct in6_addr *daddr)
 871 {
 872         struct rt6_info *rt = ip6_rt_copy(ort, daddr);
 873
 874         if (rt)
 875                 rt->rt6i_flags |= RTF_CACHE;
 876         return rt;
 877 }
 878
 879 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
 880                                       struct flowi6 *fl6, int flags)
 881 {
 882         struct fib6_node *fn;
 883         struct rt6_info *rt, *nrt;
 884         int strict = 0;
 885         int attempts = 3;
 886         int err;
 887         int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
 888
 889         strict |= flags & RT6_LOOKUP_F_IFACE;
 890
 891 relookup:
 892         read_lock_bh(&table->tb6_lock);
 893
 894 restart_2:
 895         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 896
 897 restart:
 898         rt = rt6_select(fn, oif, strict | reachable);
 899         if (rt->rt6i_nsiblings)
 900                 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
 901         BACKTRACK(net, &fl6->saddr);
 902         if (rt == net->ipv6.ip6_null_entry ||
 903             rt->rt6i_flags & RTF_CACHE)
 904                 goto out;
 905
 906         dst_hold(&rt->dst);
 907         read_unlock_bh(&table->tb6_lock);
 908
 909         if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
 910                 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
 911         else if (!(rt->dst.flags & DST_HOST))
 912                 nrt = rt6_alloc_clone(rt, &fl6->daddr);
 913         else
 914                 goto out2;
 915
 916         ip6_rt_put(rt);
 917         rt = nrt ? : net->ipv6.ip6_null_entry;
 918
 919         dst_hold(&rt->dst);
 920         if (nrt) {
 921                 err = ip6_ins_rt(nrt);
 922                 if (!err)
 923                         goto out2;
 924         }
 925
 926         if (--attempts <= 0)
 927                 goto out2;
 928
 929         /*
 930          * Race condition! In the gap, when table->tb6_lock was
 931          * released someone could insert this route.  Relookup.
 932          */
 933         ip6_rt_put(rt);
 934         goto relookup;
 935
 936 out:
 937         if (reachable) {
 938                 reachable = 0;
 939                 goto restart_2;
 940         }
 941         dst_hold(&rt->dst);
 942         read_unlock_bh(&table->tb6_lock);
 943 out2:
 944         rt->dst.lastuse = jiffies;
 945         rt->dst.__use++;
 946
 947         return rt;
 948 }
 949
 950 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
 951                                             struct flowi6 *fl6, int flags)
 952 {
 953         return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
 954 }
 955
 956 static struct dst_entry *ip6_route_input_lookup(struct net *net,
 957                                                 struct net_device *dev,
 958                                                 struct flowi6 *fl6, int flags)
 959 {
 960         if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
 961                 flags |= RT6_LOOKUP_F_IFACE;
 962
 963         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
 964 }
 965
 966 void ip6_route_input(struct sk_buff *skb)
 967 {
 968         const struct ipv6hdr *iph = ipv6_hdr(skb);
 969         struct net *net = dev_net(skb->dev);
 970         int flags = RT6_LOOKUP_F_HAS_SADDR;
 971         struct flowi6 fl6 = {
 972                 .flowi6_iif = skb->dev->ifindex,
 973                 .daddr = iph->daddr,
 974                 .saddr = iph->saddr,
 975                 .flowlabel = ip6_flowinfo(iph),
 976                 .flowi6_mark = skb->mark,
 977                 .flowi6_proto = iph->nexthdr,
 978         };
 979
 980         skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
 981 }
 982
 983 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
 984                                              struct flowi6 *fl6, int flags)
 985 {
 986         return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
 987 }
 988
 989 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
 990                                     struct flowi6 *fl6)
 991 {
 992         int flags = 0;
 993
 994         fl6->flowi6_iif = LOOPBACK_IFINDEX;
 995
 996         if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
 997                 flags |= RT6_LOOKUP_F_IFACE;
 998
 999         if (!ipv6_addr_any(&fl6->saddr))
1000                 flags |= RT6_LOOKUP_F_HAS_SADDR;
1001         else if (sk)
1002                 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1003
1004         return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1005 }
1006
1007 EXPORT_SYMBOL(ip6_route_output);
1008
1009 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1010 {
1011         struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1012         struct dst_entry *new = NULL;
1013
1014         rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1015         if (rt) {
1016                 new = &rt->dst;
1017
1018                 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1019                 rt6_init_peer(rt, net->ipv6.peers);
1020
1021                 new->__use = 1;
1022                 new->input = dst_discard;
1023                 new->output = dst_discard;
1024
1025                 if (dst_metrics_read_only(&ort->dst))
1026                         new->_metrics = ort->dst._metrics;
1027                 else
1028                         dst_copy_metrics(new, &ort->dst);
1029                 rt->rt6i_idev = ort->rt6i_idev;
1030                 if (rt->rt6i_idev)
1031                         in6_dev_hold(rt->rt6i_idev);
1032
1033                 rt->rt6i_gateway = ort->rt6i_gateway;
1034                 rt->rt6i_flags = ort->rt6i_flags;
1035                 rt->rt6i_metric = 0;
1036
1037                 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1038 #ifdef CONFIG_IPV6_SUBTREES
1039                 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1040 #endif
1041
1042                 dst_free(new);
1043         }
1044
1045         dst_release(dst_orig);
1046         return new ? new : ERR_PTR(-ENOMEM);
1047 }
1048
1049 /*
1050  *      Destination cache support functions
1051  */
1052
1053 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1054 {
1055         struct rt6_info *rt;
1056
1057         rt = (struct rt6_info *) dst;
1058
1059         /* All IPV6 dsts are created with ->obsolete set to the value
1060          * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1061          * into this function always.
1062          */
1063         if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
1064                 return NULL;
1065
1066         if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
1067                 return dst;
1068
1069         return NULL;
1070 }
1071
1072 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1073 {
1074         struct rt6_info *rt = (struct rt6_info *) dst;
1075
1076         if (rt) {
1077                 if (rt->rt6i_flags & RTF_CACHE) {
1078                         if (rt6_check_expired(rt)) {
1079                                 ip6_del_rt(rt);
1080                                 dst = NULL;
1081                         }
1082                 } else {
1083                         dst_release(dst);
1084                         dst = NULL;
1085                 }
1086         }
1087         return dst;
1088 }
1089
1090 static void ip6_link_failure(struct sk_buff *skb)
1091 {
1092         struct rt6_info *rt;
1093
1094         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1095
1096         rt = (struct rt6_info *) skb_dst(skb);
1097         if (rt) {
1098                 if (rt->rt6i_flags & RTF_CACHE) {
1099                         dst_hold(&rt->dst);
1100                         if (ip6_del_rt(rt))
1101                                 dst_free(&rt->dst);
1102                 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1103                         rt->rt6i_node->fn_sernum = -1;
1104                 }
1105         }
1106 }
1107
1108 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1109                                struct sk_buff *skb, u32 mtu)
1110 {
1111         struct rt6_info *rt6 = (struct rt6_info*)dst;
1112
1113         dst_confirm(dst);
1114         if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1115                 struct net *net = dev_net(dst->dev);
1116
1117                 rt6->rt6i_flags |= RTF_MODIFIED;
1118                 if (mtu < IPV6_MIN_MTU) {
1119                         u32 features = dst_metric(dst, RTAX_FEATURES);
1120                         mtu = IPV6_MIN_MTU;
1121                         features |= RTAX_FEATURE_ALLFRAG;
1122                         dst_metric_set(dst, RTAX_FEATURES, features);
1123                 }
1124                 dst_metric_set(dst, RTAX_MTU, mtu);
1125                 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1126         }
1127 }
1128
1129 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1130                      int oif, u32 mark)
1131 {
1132         const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1133         struct dst_entry *dst;
1134         struct flowi6 fl6;
1135
1136         memset(&fl6, 0, sizeof(fl6));
1137         fl6.flowi6_oif = oif;
1138         fl6.flowi6_mark = mark;
1139         fl6.flowi6_flags = 0;
1140         fl6.daddr = iph->daddr;
1141         fl6.saddr = iph->saddr;
1142         fl6.flowlabel = ip6_flowinfo(iph);
1143
1144         dst = ip6_route_output(net, NULL, &fl6);
1145         if (!dst->error)
1146                 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1147         dst_release(dst);
1148 }
1149 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1150
1151 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1152 {
1153         ip6_update_pmtu(skb, sock_net(sk), mtu,
1154                         sk->sk_bound_dev_if, sk->sk_mark);
1155 }
1156 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1157
1158 /* Handle redirects */
1159 struct ip6rd_flowi {
1160         struct flowi6 fl6;
1161         struct in6_addr gateway;
1162 };
1163
1164 static struct rt6_info *__ip6_route_redirect(struct net *net,
1165                                              struct fib6_table *table,
1166                                              struct flowi6 *fl6,
1167                                              int flags)
1168 {
1169         struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1170         struct rt6_info *rt;
1171         struct fib6_node *fn;
1172
1173         /* Get the "current" route for this destination and
1174          * check if the redirect has come from approriate router.
1175          *
1176          * RFC 4861 specifies that redirects should only be
1177          * accepted if they come from the nexthop to the target.
1178          * Due to the way the routes are chosen, this notion
1179          * is a bit fuzzy and one might need to check all possible
1180          * routes.
1181          */
1182
1183         read_lock_bh(&table->tb6_lock);
1184         fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1185 restart:
1186         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1187                 if (rt6_check_expired(rt))
1188                         continue;
1189                 if (rt->dst.error)
1190                         break;
1191                 if (!(rt->rt6i_flags & RTF_GATEWAY))
1192                         continue;
1193                 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1194                         continue;
1195                 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1196                         continue;
1197                 break;
1198         }
1199
1200         if (!rt)
1201                 rt = net->ipv6.ip6_null_entry;
1202         else if (rt->dst.error) {
1203                 rt = net->ipv6.ip6_null_entry;
1204                 goto out;
1205         }
1206         BACKTRACK(net, &fl6->saddr);
1207 out:
1208         dst_hold(&rt->dst);
1209
1210         read_unlock_bh(&table->tb6_lock);
1211
1212         return rt;
1213 };
1214
1215 static struct dst_entry *ip6_route_redirect(struct net *net,
1216                                         const struct flowi6 *fl6,
1217                                         const struct in6_addr *gateway)
1218 {
1219         int flags = RT6_LOOKUP_F_HAS_SADDR;
1220         struct ip6rd_flowi rdfl;
1221
1222         rdfl.fl6 = *fl6;
1223         rdfl.gateway = *gateway;
1224
1225         return fib6_rule_lookup(net, &rdfl.fl6,
1226                                 flags, __ip6_route_redirect);
1227 }
1228
1229 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1230 {
1231         const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1232         struct dst_entry *dst;
1233         struct flowi6 fl6;
1234
1235         memset(&fl6, 0, sizeof(fl6));
1236         fl6.flowi6_oif = oif;
1237         fl6.flowi6_mark = mark;
1238         fl6.flowi6_flags = 0;
1239         fl6.daddr = iph->daddr;
1240         fl6.saddr = iph->saddr;
1241         fl6.flowlabel = ip6_flowinfo(iph);
1242
1243         dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1244         rt6_do_redirect(dst, NULL, skb);
1245         dst_release(dst);
1246 }
1247 EXPORT_SYMBOL_GPL(ip6_redirect);
1248
1249 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1250                             u32 mark)
1251 {
1252         const struct ipv6hdr *iph = ipv6_hdr(skb);
1253         const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1254         struct dst_entry *dst;
1255         struct flowi6 fl6;
1256
1257         memset(&fl6, 0, sizeof(fl6));
1258         fl6.flowi6_oif = oif;
1259         fl6.flowi6_mark = mark;
1260         fl6.flowi6_flags = 0;
1261         fl6.daddr = msg->dest;
1262         fl6.saddr = iph->daddr;
1263
1264         dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1265         rt6_do_redirect(dst, NULL, skb);
1266         dst_release(dst);
1267 }
1268
1269 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1270 {
1271         ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1272 }
1273 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1274
1275 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1276 {
1277         struct net_device *dev = dst->dev;
1278         unsigned int mtu = dst_mtu(dst);
1279         struct net *net = dev_net(dev);
1280
1281         mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1282
1283         if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1284                 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1285
1286         /*
1287          * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1288          * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1289          * IPV6_MAXPLEN is also valid and means: "any MSS,
1290          * rely only on pmtu discovery"
1291          */
1292         if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1293                 mtu = IPV6_MAXPLEN;
1294         return mtu;
1295 }
1296
1297 static unsigned int ip6_mtu(const struct dst_entry *dst)
1298 {
1299         struct inet6_dev *idev;
1300         unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1301
1302         if (mtu)
1303                 return mtu;
1304
1305         mtu = IPV6_MIN_MTU;
1306
1307         rcu_read_lock();
1308         idev = __in6_dev_get(dst->dev);
1309         if (idev)
1310                 mtu = idev->cnf.mtu6;
1311         rcu_read_unlock();
1312
1313         return mtu;
1314 }
1315
1316 static struct dst_entry *icmp6_dst_gc_list;
1317 static DEFINE_SPINLOCK(icmp6_dst_lock);
1318
1319 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1320                                   struct flowi6 *fl6)
1321 {
1322         struct dst_entry *dst;
1323         struct rt6_info *rt;
1324         struct inet6_dev *idev = in6_dev_get(dev);
1325         struct net *net = dev_net(dev);
1326
1327         if (unlikely(!idev))
1328                 return ERR_PTR(-ENODEV);
1329
1330         rt = ip6_dst_alloc(net, dev, 0, NULL);
1331         if (unlikely(!rt)) {
1332                 in6_dev_put(idev);
1333                 dst = ERR_PTR(-ENOMEM);
1334                 goto out;
1335         }
1336
1337         rt->dst.flags |= DST_HOST;
1338         rt->dst.output  = ip6_output;
1339         atomic_set(&rt->dst.__refcnt, 1);
1340         rt->rt6i_gateway  = fl6->daddr;
1341         rt->rt6i_dst.addr = fl6->daddr;
1342         rt->rt6i_dst.plen = 128;
1343         rt->rt6i_idev     = idev;
1344         dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1345
1346         spin_lock_bh(&icmp6_dst_lock);
1347         rt->dst.next = icmp6_dst_gc_list;
1348         icmp6_dst_gc_list = &rt->dst;
1349         spin_unlock_bh(&icmp6_dst_lock);
1350
1351         fib6_force_start_gc(net);
1352
1353         dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1354
1355 out:
1356         return dst;
1357 }
1358
1359 int icmp6_dst_gc(void)
1360 {
1361         struct dst_entry *dst, **pprev;
1362         int more = 0;
1363
1364         spin_lock_bh(&icmp6_dst_lock);
1365         pprev = &icmp6_dst_gc_list;
1366
1367         while ((dst = *pprev) != NULL) {
1368                 if (!atomic_read(&dst->__refcnt)) {
1369                         *pprev = dst->next;
1370                         dst_free(dst);
1371                 } else {
1372                         pprev = &dst->next;
1373                         ++more;
1374                 }
1375         }
1376
1377         spin_unlock_bh(&icmp6_dst_lock);
1378
1379         return more;
1380 }
1381
1382 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1383                             void *arg)
1384 {
1385         struct dst_entry *dst, **pprev;
1386
1387         spin_lock_bh(&icmp6_dst_lock);
1388         pprev = &icmp6_dst_gc_list;
1389         while ((dst = *pprev) != NULL) {
1390                 struct rt6_info *rt = (struct rt6_info *) dst;
1391                 if (func(rt, arg)) {
1392                         *pprev = dst->next;
1393                         dst_free(dst);
1394                 } else {
1395                         pprev = &dst->next;
1396                 }
1397         }
1398         spin_unlock_bh(&icmp6_dst_lock);
1399 }
1400
1401 static int ip6_dst_gc(struct dst_ops *ops)
1402 {
1403         struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1404         int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1405         int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1406         int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1407         int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1408         unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1409         int entries;
1410
1411         entries = dst_entries_get_fast(ops);
1412         if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1413             entries <= rt_max_size)
1414                 goto out;
1415
1416         net->ipv6.ip6_rt_gc_expire++;
1417         fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1418         entries = dst_entries_get_slow(ops);
1419         if (entries < ops->gc_thresh)
1420                 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1421 out:
1422         net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1423         return entries > rt_max_size;
1424 }
1425
1426 /*
1427  *
1428  */
1429
1430 int ip6_route_add(struct fib6_config *cfg)
1431 {
1432         int err;
1433         struct net *net = cfg->fc_nlinfo.nl_net;
1434         struct rt6_info *rt = NULL;
1435         struct net_device *dev = NULL;
1436         struct inet6_dev *idev = NULL;
1437         struct fib6_table *table;
1438         int addr_type;
1439
1440         if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1441                 return -EINVAL;
1442 #ifndef CONFIG_IPV6_SUBTREES
1443         if (cfg->fc_src_len)
1444                 return -EINVAL;
1445 #endif
1446         if (cfg->fc_ifindex) {
1447                 err = -ENODEV;
1448                 dev = dev_get_by_index(net, cfg->fc_ifindex);
1449                 if (!dev)
1450                         goto out;
1451                 idev = in6_dev_get(dev);
1452                 if (!idev)
1453                         goto out;
1454         }
1455
1456         if (cfg->fc_metric == 0)
1457                 cfg->fc_metric = IP6_RT_PRIO_USER;
1458
1459         err = -ENOBUFS;
1460         if (cfg->fc_nlinfo.nlh &&
1461             !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1462                 table = fib6_get_table(net, cfg->fc_table);
1463                 if (!table) {
1464                         pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1465                         table = fib6_new_table(net, cfg->fc_table);
1466                 }
1467         } else {
1468                 table = fib6_new_table(net, cfg->fc_table);
1469         }
1470
1471         if (!table)
1472                 goto out;
1473
1474         rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
1475
1476         if (!rt) {
1477                 err = -ENOMEM;
1478                 goto out;
1479         }
1480
1481         if (cfg->fc_flags & RTF_EXPIRES)
1482                 rt6_set_expires(rt, jiffies +
1483                                 clock_t_to_jiffies(cfg->fc_expires));
1484         else
1485                 rt6_clean_expires(rt);
1486
1487         if (cfg->fc_protocol == RTPROT_UNSPEC)
1488                 cfg->fc_protocol = RTPROT_BOOT;
1489         rt->rt6i_protocol = cfg->fc_protocol;
1490
1491         addr_type = ipv6_addr_type(&cfg->fc_dst);
1492
1493         if (addr_type & IPV6_ADDR_MULTICAST)
1494                 rt->dst.input = ip6_mc_input;
1495         else if (cfg->fc_flags & RTF_LOCAL)
1496                 rt->dst.input = ip6_input;
1497         else
1498                 rt->dst.input = ip6_forward;
1499
1500         rt->dst.output = ip6_output;
1501
1502         ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1503         rt->rt6i_dst.plen = cfg->fc_dst_len;
1504         if (rt->rt6i_dst.plen == 128)
1505                rt->dst.flags |= DST_HOST;
1506
1507         if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1508                 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1509                 if (!metrics) {
1510                         err = -ENOMEM;
1511                         goto out;
1512                 }
1513                 dst_init_metrics(&rt->dst, metrics, 0);
1514         }
1515 #ifdef CONFIG_IPV6_SUBTREES
1516         ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1517         rt->rt6i_src.plen = cfg->fc_src_len;
1518 #endif
1519
1520         rt->rt6i_metric = cfg->fc_metric;
1521
1522         /* We cannot add true routes via loopback here,
1523            they would result in kernel looping; promote them to reject routes
1524          */
1525         if ((cfg->fc_flags & RTF_REJECT) ||
1526             (dev && (dev->flags & IFF_LOOPBACK) &&
1527              !(addr_type & IPV6_ADDR_LOOPBACK) &&
1528              !(cfg->fc_flags & RTF_LOCAL))) {
1529                 /* hold loopback dev/idev if we haven't done so. */
1530                 if (dev != net->loopback_dev) {
1531                         if (dev) {
1532                                 dev_put(dev);
1533                                 in6_dev_put(idev);
1534                         }
1535                         dev = net->loopback_dev;
1536                         dev_hold(dev);
1537                         idev = in6_dev_get(dev);
1538                         if (!idev) {
1539                                 err = -ENODEV;
1540                                 goto out;
1541                         }
1542                 }
1543                 rt->dst.output = ip6_pkt_discard_out;
1544                 rt->dst.input = ip6_pkt_discard;
1545                 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1546                 switch (cfg->fc_type) {
1547                 case RTN_BLACKHOLE:
1548                         rt->dst.error = -EINVAL;
1549                         break;
1550                 case RTN_PROHIBIT:
1551                         rt->dst.error = -EACCES;
1552                         break;
1553                 case RTN_THROW:
1554                         rt->dst.error = -EAGAIN;
1555                         break;
1556                 default:
1557                         rt->dst.error = -ENETUNREACH;
1558                         break;
1559                 }
1560                 goto install_route;
1561         }
1562
1563         if (cfg->fc_flags & RTF_GATEWAY) {
1564                 const struct in6_addr *gw_addr;
1565                 int gwa_type;
1566
1567                 gw_addr = &cfg->fc_gateway;
1568                 rt->rt6i_gateway = *gw_addr;
1569                 gwa_type = ipv6_addr_type(gw_addr);
1570
1571                 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1572                         struct rt6_info *grt;
1573
1574                         /* IPv6 strictly inhibits using not link-local
1575                            addresses as nexthop address.
1576                            Otherwise, router will not able to send redirects.
1577                            It is very good, but in some (rare!) circumstances
1578                            (SIT, PtP, NBMA NOARP links) it is handy to allow
1579                            some exceptions. --ANK
1580                          */
1581                         err = -EINVAL;
1582                         if (!(gwa_type & IPV6_ADDR_UNICAST))
1583                                 goto out;
1584
1585                         grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1586
1587                         err = -EHOSTUNREACH;
1588                         if (!grt)
1589                                 goto out;
1590                         if (dev) {
1591                                 if (dev != grt->dst.dev) {
1592                                         ip6_rt_put(grt);
1593                                         goto out;
1594                                 }
1595                         } else {
1596                                 dev = grt->dst.dev;
1597                                 idev = grt->rt6i_idev;
1598                                 dev_hold(dev);
1599                                 in6_dev_hold(grt->rt6i_idev);
1600                         }
1601                         if (!(grt->rt6i_flags & RTF_GATEWAY))
1602                                 err = 0;
1603                         ip6_rt_put(grt);
1604
1605                         if (err)
1606                                 goto out;
1607                 }
1608                 err = -EINVAL;
1609                 if (!dev || (dev->flags & IFF_LOOPBACK))
1610                         goto out;
1611         }
1612
1613         err = -ENODEV;
1614         if (!dev)
1615                 goto out;
1616
1617         if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1618                 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1619                         err = -EINVAL;
1620                         goto out;
1621                 }
1622                 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1623                 rt->rt6i_prefsrc.plen = 128;
1624         } else
1625                 rt->rt6i_prefsrc.plen = 0;
1626
1627         rt->rt6i_flags = cfg->fc_flags;
1628
1629 install_route:
1630         if (cfg->fc_mx) {
1631                 struct nlattr *nla;
1632                 int remaining;
1633
1634                 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1635                         int type = nla_type(nla);
1636
1637                         if (type) {
1638                                 if (type > RTAX_MAX) {
1639                                         err = -EINVAL;
1640                                         goto out;
1641                                 }
1642
1643                                 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1644                         }
1645                 }
1646         }
1647
1648         rt->dst.dev = dev;
1649         rt->rt6i_idev = idev;
1650         rt->rt6i_table = table;
1651
1652         cfg->fc_nlinfo.nl_net = dev_net(dev);
1653
1654         return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1655
1656 out:
1657         if (dev)
1658                 dev_put(dev);
1659         if (idev)
1660                 in6_dev_put(idev);
1661         if (rt)
1662                 dst_free(&rt->dst);
1663         return err;
1664 }
1665
1666 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1667 {
1668         int err;
1669         struct fib6_table *table;
1670         struct net *net = dev_net(rt->dst.dev);
1671
1672         if (rt == net->ipv6.ip6_null_entry) {
1673                 err = -ENOENT;
1674                 goto out;
1675         }
1676
1677         table = rt->rt6i_table;
1678         write_lock_bh(&table->tb6_lock);
1679         err = fib6_del(rt, info);
1680         write_unlock_bh(&table->tb6_lock);
1681
1682 out:
1683         ip6_rt_put(rt);
1684         return err;
1685 }
1686
1687 int ip6_del_rt(struct rt6_info *rt)
1688 {
1689         struct nl_info info = {
1690                 .nl_net = dev_net(rt->dst.dev),
1691         };
1692         return __ip6_del_rt(rt, &info);
1693 }
1694
1695 static int ip6_route_del(struct fib6_config *cfg)
1696 {
1697         struct fib6_table *table;
1698         struct fib6_node *fn;
1699         struct rt6_info *rt;
1700         int err = -ESRCH;
1701
1702         table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1703         if (!table)
1704                 return err;
1705
1706         read_lock_bh(&table->tb6_lock);
1707
1708         fn = fib6_locate(&table->tb6_root,
1709                          &cfg->fc_dst, cfg->fc_dst_len,
1710                          &cfg->fc_src, cfg->fc_src_len);
1711
1712         if (fn) {
1713                 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1714                         if (cfg->fc_ifindex &&
1715                             (!rt->dst.dev ||
1716                              rt->dst.dev->ifindex != cfg->fc_ifindex))
1717                                 continue;
1718                         if (cfg->fc_flags & RTF_GATEWAY &&
1719                             !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1720                                 continue;
1721                         if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1722                                 continue;
1723                         dst_hold(&rt->dst);
1724                         read_unlock_bh(&table->tb6_lock);
1725
1726                         return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1727                 }
1728         }
1729         read_unlock_bh(&table->tb6_lock);
1730
1731         return err;
1732 }
1733
1734 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1735 {
1736         struct net *net = dev_net(skb->dev);
1737         struct netevent_redirect netevent;
1738         struct rt6_info *rt, *nrt = NULL;
1739         struct ndisc_options ndopts;
1740         struct inet6_dev *in6_dev;
1741         struct neighbour *neigh;
1742         struct rd_msg *msg;
1743         int optlen, on_link;
1744         u8 *lladdr;
1745
1746         optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1747         optlen -= sizeof(*msg);
1748
1749         if (optlen < 0) {
1750                 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1751                 return;
1752         }
1753
1754         msg = (struct rd_msg *)icmp6_hdr(skb);
1755
1756         if (ipv6_addr_is_multicast(&msg->dest)) {
1757                 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1758                 return;
1759         }
1760
1761         on_link = 0;
1762         if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1763                 on_link = 1;
1764         } else if (ipv6_addr_type(&msg->target) !=
1765                    (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1766                 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1767                 return;
1768         }
1769
1770         in6_dev = __in6_dev_get(skb->dev);
1771         if (!in6_dev)
1772                 return;
1773         if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1774                 return;
1775
1776         /* RFC2461 8.1:
1777          *      The IP source address of the Redirect MUST be the same as the current
1778          *      first-hop router for the specified ICMP Destination Address.
1779          */
1780
1781         if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1782                 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1783                 return;
1784         }
1785
1786         lladdr = NULL;
1787         if (ndopts.nd_opts_tgt_lladdr) {
1788                 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1789                                              skb->dev);
1790                 if (!lladdr) {
1791                         net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1792                         return;
1793                 }
1794         }
1795
1796         rt = (struct rt6_info *) dst;
1797         if (rt == net->ipv6.ip6_null_entry) {
1798                 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1799                 return;
1800         }
1801
1802         /* Redirect received -> path was valid.
1803          * Look, redirects are sent only in response to data packets,
1804          * so that this nexthop apparently is reachable. --ANK
1805          */
1806         dst_confirm(&rt->dst);
1807
1808         neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1809         if (!neigh)
1810                 return;
1811
1812         /*
1813          *      We have finally decided to accept it.
1814          */
1815
1816         neigh_update(neigh, lladdr, NUD_STALE,
1817                      NEIGH_UPDATE_F_WEAK_OVERRIDE|
1818                      NEIGH_UPDATE_F_OVERRIDE|
1819                      (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1820                                      NEIGH_UPDATE_F_ISROUTER))
1821                      );
1822
1823         nrt = ip6_rt_copy(rt, &msg->dest);
1824         if (!nrt)
1825                 goto out;
1826
1827         nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1828         if (on_link)
1829                 nrt->rt6i_flags &= ~RTF_GATEWAY;
1830
1831         nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1832
1833         if (ip6_ins_rt(nrt))
1834                 goto out;
1835
1836         netevent.old = &rt->dst;
1837         netevent.new = &nrt->dst;
1838         netevent.daddr = &msg->dest;
1839         netevent.neigh = neigh;
1840         call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1841
1842         if (rt->rt6i_flags & RTF_CACHE) {
1843                 rt = (struct rt6_info *) dst_clone(&rt->dst);
1844                 ip6_del_rt(rt);
1845         }
1846
1847 out:
1848         neigh_release(neigh);
1849 }
1850
1851 /*
1852  *      Misc support functions
1853  */
1854
1855 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1856                                     const struct in6_addr *dest)
1857 {
1858         struct net *net = dev_net(ort->dst.dev);
1859         struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1860                                             ort->rt6i_table);
1861
1862         if (rt) {
1863                 rt->dst.input = ort->dst.input;
1864                 rt->dst.output = ort->dst.output;
1865                 rt->dst.flags |= DST_HOST;
1866
1867                 rt->rt6i_dst.addr = *dest;
1868                 rt->rt6i_dst.plen = 128;
1869                 dst_copy_metrics(&rt->dst, &ort->dst);
1870                 rt->dst.error = ort->dst.error;
1871                 rt->rt6i_idev = ort->rt6i_idev;
1872                 if (rt->rt6i_idev)
1873                         in6_dev_hold(rt->rt6i_idev);
1874                 rt->dst.lastuse = jiffies;
1875
1876                 if (ort->rt6i_flags & RTF_GATEWAY)
1877                         rt->rt6i_gateway = ort->rt6i_gateway;
1878                 else
1879                         rt->rt6i_gateway = *dest;
1880                 rt->rt6i_flags = ort->rt6i_flags;
1881                 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
1882                     (RTF_DEFAULT | RTF_ADDRCONF))
1883                         rt6_set_from(rt, ort);
1884                 rt->rt6i_metric = 0;
1885
1886 #ifdef CONFIG_IPV6_SUBTREES
1887                 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1888 #endif
1889                 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1890                 rt->rt6i_table = ort->rt6i_table;
1891         }
1892         return rt;
1893 }
1894
1895 #ifdef CONFIG_IPV6_ROUTE_INFO
1896 static struct rt6_info *rt6_get_route_info(struct net *net,
1897                                            const struct in6_addr *prefix, int prefixlen,
1898                                            const struct in6_addr *gwaddr, int ifindex)
1899 {
1900         struct fib6_node *fn;
1901         struct rt6_info *rt = NULL;
1902         struct fib6_table *table;
1903
1904         table = fib6_get_table(net, RT6_TABLE_INFO);
1905         if (!table)
1906                 return NULL;
1907
1908         read_lock_bh(&table->tb6_lock);
1909         fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1910         if (!fn)
1911                 goto out;
1912
1913         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1914                 if (rt->dst.dev->ifindex != ifindex)
1915                         continue;
1916                 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1917                         continue;
1918                 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1919                         continue;
1920                 dst_hold(&rt->dst);
1921                 break;
1922         }
1923 out:
1924         read_unlock_bh(&table->tb6_lock);
1925         return rt;
1926 }
1927
1928 static struct rt6_info *rt6_add_route_info(struct net *net,
1929                                            const struct in6_addr *prefix, int prefixlen,
1930                                            const struct in6_addr *gwaddr, int ifindex,
1931                                            unsigned int pref)
1932 {
1933         struct fib6_config cfg = {
1934                 .fc_table       = RT6_TABLE_INFO,
1935                 .fc_metric      = IP6_RT_PRIO_USER,
1936                 .fc_ifindex     = ifindex,
1937                 .fc_dst_len     = prefixlen,
1938                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1939                                   RTF_UP | RTF_PREF(pref),
1940                 .fc_nlinfo.portid = 0,
1941                 .fc_nlinfo.nlh = NULL,
1942                 .fc_nlinfo.nl_net = net,
1943         };
1944
1945         cfg.fc_dst = *prefix;
1946         cfg.fc_gateway = *gwaddr;
1947
1948         /* We should treat it as a default route if prefix length is 0. */
1949         if (!prefixlen)
1950                 cfg.fc_flags |= RTF_DEFAULT;
1951
1952         ip6_route_add(&cfg);
1953
1954         return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1955 }
1956 #endif
1957
1958 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1959 {
1960         struct rt6_info *rt;
1961         struct fib6_table *table;
1962
1963         table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1964         if (!table)
1965                 return NULL;
1966
1967         read_lock_bh(&table->tb6_lock);
1968         for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1969                 if (dev == rt->dst.dev &&
1970                     ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1971                     ipv6_addr_equal(&rt->rt6i_gateway, addr))
1972                         break;
1973         }
1974         if (rt)
1975                 dst_hold(&rt->dst);
1976         read_unlock_bh(&table->tb6_lock);
1977         return rt;
1978 }
1979
1980 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1981                                      struct net_device *dev,
1982                                      unsigned int pref)
1983 {
1984         struct fib6_config cfg = {
1985                 .fc_table       = RT6_TABLE_DFLT,
1986                 .fc_metric      = IP6_RT_PRIO_USER,
1987                 .fc_ifindex     = dev->ifindex,
1988                 .fc_flags       = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1989                                   RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1990                 .fc_nlinfo.portid = 0,
1991                 .fc_nlinfo.nlh = NULL,
1992                 .fc_nlinfo.nl_net = dev_net(dev),
1993         };
1994
1995         cfg.fc_gateway = *gwaddr;
1996
1997         ip6_route_add(&cfg);
1998
1999         return rt6_get_dflt_router(gwaddr, dev);
2000 }
2001
2002 void rt6_purge_dflt_routers(struct net *net)
2003 {
2004         struct rt6_info *rt;
2005         struct fib6_table *table;
2006
2007         /* NOTE: Keep consistent with rt6_get_dflt_router */
2008         table = fib6_get_table(net, RT6_TABLE_DFLT);
2009         if (!table)
2010                 return;
2011
2012 restart:
2013         read_lock_bh(&table->tb6_lock);
2014         for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2015                 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2016                     (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2017                         dst_hold(&rt->dst);
2018                         read_unlock_bh(&table->tb6_lock);
2019                         ip6_del_rt(rt);
2020                         goto restart;
2021                 }
2022         }
2023         read_unlock_bh(&table->tb6_lock);
2024 }
2025
2026 static void rtmsg_to_fib6_config(struct net *net,
2027                                  struct in6_rtmsg *rtmsg,
2028                                  struct fib6_config *cfg)
2029 {
2030         memset(cfg, 0, sizeof(*cfg));
2031
2032         cfg->fc_table = RT6_TABLE_MAIN;
2033         cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2034         cfg->fc_metric = rtmsg->rtmsg_metric;
2035         cfg->fc_expires = rtmsg->rtmsg_info;
2036         cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2037         cfg->fc_src_len = rtmsg->rtmsg_src_len;
2038         cfg->fc_flags = rtmsg->rtmsg_flags;
2039
2040         cfg->fc_nlinfo.nl_net = net;
2041
2042         cfg->fc_dst = rtmsg->rtmsg_dst;
2043         cfg->fc_src = rtmsg->rtmsg_src;
2044         cfg->fc_gateway = rtmsg->rtmsg_gateway;
2045 }
2046
2047 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2048 {
2049         struct fib6_config cfg;
2050         struct in6_rtmsg rtmsg;
2051         int err;
2052
2053         switch(cmd) {
2054         case SIOCADDRT:         /* Add a route */
2055         case SIOCDELRT:         /* Delete a route */
2056                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2057                         return -EPERM;
2058                 err = copy_from_user(&rtmsg, arg,
2059                                      sizeof(struct in6_rtmsg));
2060                 if (err)
2061                         return -EFAULT;
2062
2063                 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2064
2065                 rtnl_lock();
2066                 switch (cmd) {
2067                 case SIOCADDRT:
2068                         err = ip6_route_add(&cfg);
2069                         break;
2070                 case SIOCDELRT:
2071                         err = ip6_route_del(&cfg);
2072                         break;
2073                 default:
2074                         err = -EINVAL;
2075                 }
2076                 rtnl_unlock();
2077
2078                 return err;
2079         }
2080
2081         return -EINVAL;
2082 }
2083
2084 /*
2085  *      Drop the packet on the floor
2086  */
2087
2088 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2089 {
2090         int type;
2091         struct dst_entry *dst = skb_dst(skb);
2092         switch (ipstats_mib_noroutes) {
2093         case IPSTATS_MIB_INNOROUTES:
2094                 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2095                 if (type == IPV6_ADDR_ANY) {
2096                         IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2097                                       IPSTATS_MIB_INADDRERRORS);
2098                         break;
2099                 }
2100                 /* FALLTHROUGH */
2101         case IPSTATS_MIB_OUTNOROUTES:
2102                 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2103                               ipstats_mib_noroutes);
2104                 break;
2105         }
2106         icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2107         kfree_skb(skb);
2108         return 0;
2109 }
2110
2111 static int ip6_pkt_discard(struct sk_buff *skb)
2112 {
2113         return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2114 }
2115
2116 static int ip6_pkt_discard_out(struct sk_buff *skb)
2117 {
2118         skb->dev = skb_dst(skb)->dev;
2119         return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2120 }
2121
2122 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2123
2124 static int ip6_pkt_prohibit(struct sk_buff *skb)
2125 {
2126         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2127 }
2128
2129 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2130 {
2131         skb->dev = skb_dst(skb)->dev;
2132         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2133 }
2134
2135 #endif
2136
2137 /*
2138  *      Allocate a dst for local (unicast / anycast) address.
2139  */
2140
2141 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2142                                     const struct in6_addr *addr,
2143                                     bool anycast)
2144 {
2145         struct net *net = dev_net(idev->dev);
2146         struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
2147
2148         if (!rt) {
2149                 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2150                 return ERR_PTR(-ENOMEM);
2151         }
2152
2153         in6_dev_hold(idev);
2154
2155         rt->dst.flags |= DST_HOST;
2156         rt->dst.input = ip6_input;
2157         rt->dst.output = ip6_output;
2158         rt->rt6i_idev = idev;
2159
2160         rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2161         if (anycast)
2162                 rt->rt6i_flags |= RTF_ANYCAST;
2163         else
2164                 rt->rt6i_flags |= RTF_LOCAL;
2165
2166         rt->rt6i_gateway  = *addr;
2167         rt->rt6i_dst.addr = *addr;
2168         rt->rt6i_dst.plen = 128;
2169         rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2170
2171         atomic_set(&rt->dst.__refcnt, 1);
2172
2173         return rt;
2174 }
2175
2176 int ip6_route_get_saddr(struct net *net,
2177                         struct rt6_info *rt,
2178                         const struct in6_addr *daddr,
2179                         unsigned int prefs,
2180                         struct in6_addr *saddr)
2181 {
2182         struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2183         int err = 0;
2184         if (rt->rt6i_prefsrc.plen)
2185                 *saddr = rt->rt6i_prefsrc.addr;
2186         else
2187                 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2188                                          daddr, prefs, saddr);
2189         return err;
2190 }
2191
2192 /* remove deleted ip from prefsrc entries */
2193 struct arg_dev_net_ip {
2194         struct net_device *dev;
2195         struct net *net;
2196         struct in6_addr *addr;
2197 };
2198
2199 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2200 {
2201         struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2202         struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2203         struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2204
2205         if (((void *)rt->dst.dev == dev || !dev) &&
2206             rt != net->ipv6.ip6_null_entry &&
2207             ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2208                 /* remove prefsrc entry */
2209                 rt->rt6i_prefsrc.plen = 0;
2210         }
2211         return 0;
2212 }
2213
2214 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2215 {
2216         struct net *net = dev_net(ifp->idev->dev);
2217         struct arg_dev_net_ip adni = {
2218                 .dev = ifp->idev->dev,
2219                 .net = net,
2220                 .addr = &ifp->addr,
2221         };
2222         fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2223 }
2224
2225 struct arg_dev_net {
2226         struct net_device *dev;
2227         struct net *net;
2228 };
2229
2230 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2231 {
2232         const struct arg_dev_net *adn = arg;
2233         const struct net_device *dev = adn->dev;
2234
2235         if ((rt->dst.dev == dev || !dev) &&
2236             rt != adn->net->ipv6.ip6_null_entry)
2237                 return -1;
2238
2239         return 0;
2240 }
2241
2242 void rt6_ifdown(struct net *net, struct net_device *dev)
2243 {
2244         struct arg_dev_net adn = {
2245                 .dev = dev,
2246                 .net = net,
2247         };
2248
2249         fib6_clean_all(net, fib6_ifdown, 0, &adn);
2250         icmp6_clean_all(fib6_ifdown, &adn);
2251 }
2252
2253 struct rt6_mtu_change_arg {
2254         struct net_device *dev;
2255         unsigned int mtu;
2256 };
2257
2258 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2259 {
2260         struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2261         struct inet6_dev *idev;
2262
2263         /* In IPv6 pmtu discovery is not optional,
2264            so that RTAX_MTU lock cannot disable it.
2265            We still use this lock to block changes
2266            caused by addrconf/ndisc.
2267         */
2268
2269         idev = __in6_dev_get(arg->dev);
2270         if (!idev)
2271                 return 0;
2272
2273         /* For administrative MTU increase, there is no way to discover
2274            IPv6 PMTU increase, so PMTU increase should be updated here.
2275            Since RFC 1981 doesn't include administrative MTU increase
2276            update PMTU increase is a MUST. (i.e. jumbo frame)
2277          */
2278         /*
2279            If new MTU is less than route PMTU, this new MTU will be the
2280            lowest MTU in the path, update the route PMTU to reflect PMTU
2281            decreases; if new MTU is greater than route PMTU, and the
2282            old MTU is the lowest MTU in the path, update the route PMTU
2283            to reflect the increase. In this case if the other nodes' MTU
2284            also have the lowest MTU, TOO BIG MESSAGE will be lead to
2285            PMTU discouvery.
2286          */
2287         if (rt->dst.dev == arg->dev &&
2288             !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2289             (dst_mtu(&rt->dst) >= arg->mtu ||
2290              (dst_mtu(&rt->dst) < arg->mtu &&
2291               dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2292                 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2293         }
2294         return 0;
2295 }
2296
2297 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2298 {
2299         struct rt6_mtu_change_arg arg = {
2300                 .dev = dev,
2301                 .mtu = mtu,
2302         };
2303
2304         fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2305 }
2306
2307 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2308         [RTA_GATEWAY]           = { .len = sizeof(struct in6_addr) },
2309         [RTA_OIF]               = { .type = NLA_U32 },
2310         [RTA_IIF]               = { .type = NLA_U32 },
2311         [RTA_PRIORITY]          = { .type = NLA_U32 },
2312         [RTA_METRICS]           = { .type = NLA_NESTED },
2313         [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
2314 };
2315
2316 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2317                               struct fib6_config *cfg)
2318 {
2319         struct rtmsg *rtm;
2320         struct nlattr *tb[RTA_MAX+1];
2321         int err;
2322
2323         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2324         if (err < 0)
2325                 goto errout;
2326
2327         err = -EINVAL;
2328         rtm = nlmsg_data(nlh);
2329         memset(cfg, 0, sizeof(*cfg));
2330
2331         cfg->fc_table = rtm->rtm_table;
2332         cfg->fc_dst_len = rtm->rtm_dst_len;
2333         cfg->fc_src_len = rtm->rtm_src_len;
2334         cfg->fc_flags = RTF_UP;
2335         cfg->fc_protocol = rtm->rtm_protocol;
2336         cfg->fc_type = rtm->rtm_type;
2337
2338         if (rtm->rtm_type == RTN_UNREACHABLE ||
2339             rtm->rtm_type == RTN_BLACKHOLE ||
2340             rtm->rtm_type == RTN_PROHIBIT ||
2341             rtm->rtm_type == RTN_THROW)
2342                 cfg->fc_flags |= RTF_REJECT;
2343
2344         if (rtm->rtm_type == RTN_LOCAL)
2345                 cfg->fc_flags |= RTF_LOCAL;
2346
2347         cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2348         cfg->fc_nlinfo.nlh = nlh;
2349         cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2350
2351         if (tb[RTA_GATEWAY]) {
2352                 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2353                 cfg->fc_flags |= RTF_GATEWAY;
2354         }
2355
2356         if (tb[RTA_DST]) {
2357                 int plen = (rtm->rtm_dst_len + 7) >> 3;
2358
2359                 if (nla_len(tb[RTA_DST]) < plen)
2360                         goto errout;
2361
2362                 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2363         }
2364
2365         if (tb[RTA_SRC]) {
2366                 int plen = (rtm->rtm_src_len + 7) >> 3;
2367
2368                 if (nla_len(tb[RTA_SRC]) < plen)
2369                         goto errout;
2370
2371                 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2372         }
2373
2374         if (tb[RTA_PREFSRC])
2375                 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2376
2377         if (tb[RTA_OIF])
2378                 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2379
2380         if (tb[RTA_PRIORITY])
2381                 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2382
2383         if (tb[RTA_METRICS]) {
2384                 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2385                 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2386         }
2387
2388         if (tb[RTA_TABLE])
2389                 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2390
2391         if (tb[RTA_MULTIPATH]) {
2392                 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2393                 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2394         }
2395
2396         err = 0;
2397 errout:
2398         return err;
2399 }
2400
2401 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2402 {
2403         struct fib6_config r_cfg;
2404         struct rtnexthop *rtnh;
2405         int remaining;
2406         int attrlen;
2407         int err = 0, last_err = 0;
2408
2409 beginning:
2410         rtnh = (struct rtnexthop *)cfg->fc_mp;
2411         remaining = cfg->fc_mp_len;
2412
2413         /* Parse a Multipath Entry */
2414         while (rtnh_ok(rtnh, remaining)) {
2415                 memcpy(&r_cfg, cfg, sizeof(*cfg));
2416                 if (rtnh->rtnh_ifindex)
2417                         r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2418
2419                 attrlen = rtnh_attrlen(rtnh);
2420                 if (attrlen > 0) {
2421                         struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2422
2423                         nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2424                         if (nla) {
2425                                 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2426                                 r_cfg.fc_flags |= RTF_GATEWAY;
2427                         }
2428                 }
2429                 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2430                 if (err) {
2431                         last_err = err;
2432                         /* If we are trying to remove a route, do not stop the
2433                          * loop when ip6_route_del() fails (because next hop is
2434                          * already gone), we should try to remove all next hops.
2435                          */
2436                         if (add) {
2437                                 /* If add fails, we should try to delete all
2438                                  * next hops that have been already added.
2439                                  */
2440                                 add = 0;
2441                                 goto beginning;
2442                         }
2443                 }
2444                 /* Because each route is added like a single route we remove
2445                  * this flag after the first nexthop (if there is a collision,
2446                  * we have already fail to add the first nexthop:
2447                  * fib6_add_rt2node() has reject it).
2448                  */
2449                 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2450                 rtnh = rtnh_next(rtnh, &remaining);
2451         }
2452
2453         return last_err;
2454 }
2455
2456 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2457 {
2458         struct fib6_config cfg;
2459         int err;
2460
2461         err = rtm_to_fib6_config(skb, nlh, &cfg);
2462         if (err < 0)
2463                 return err;
2464
2465         if (cfg.fc_mp)
2466                 return ip6_route_multipath(&cfg, 0);
2467         else
2468                 return ip6_route_del(&cfg);
2469 }
2470
2471 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2472 {
2473         struct fib6_config cfg;
2474         int err;
2475
2476         err = rtm_to_fib6_config(skb, nlh, &cfg);
2477         if (err < 0)
2478                 return err;
2479
2480         if (cfg.fc_mp)
2481                 return ip6_route_multipath(&cfg, 1);
2482         else
2483                 return ip6_route_add(&cfg);
2484 }
2485
2486 static inline size_t rt6_nlmsg_size(void)
2487 {
2488         return NLMSG_ALIGN(sizeof(struct rtmsg))
2489                + nla_total_size(16) /* RTA_SRC */
2490                + nla_total_size(16) /* RTA_DST */
2491                + nla_total_size(16) /* RTA_GATEWAY */
2492                + nla_total_size(16) /* RTA_PREFSRC */
2493                + nla_total_size(4) /* RTA_TABLE */
2494                + nla_total_size(4) /* RTA_IIF */
2495                + nla_total_size(4) /* RTA_OIF */
2496                + nla_total_size(4) /* RTA_PRIORITY */
2497                + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2498                + nla_total_size(sizeof(struct rta_cacheinfo));
2499 }
2500
2501 static int rt6_fill_node(struct net *net,
2502                          struct sk_buff *skb, struct rt6_info *rt,
2503                          struct in6_addr *dst, struct in6_addr *src,
2504                          int iif, int type, u32 portid, u32 seq,
2505                          int prefix, int nowait, unsigned int flags)
2506 {
2507         struct rtmsg *rtm;
2508         struct nlmsghdr *nlh;
2509         long expires;
2510         u32 table;
2511
2512         if (prefix) {   /* user wants prefix routes only */
2513                 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2514                         /* success since this is not a prefix route */
2515                         return 1;
2516                 }
2517         }
2518
2519         nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2520         if (!nlh)
2521                 return -EMSGSIZE;
2522
2523         rtm = nlmsg_data(nlh);
2524         rtm->rtm_family = AF_INET6;
2525         rtm->rtm_dst_len = rt->rt6i_dst.plen;
2526         rtm->rtm_src_len = rt->rt6i_src.plen;
2527         rtm->rtm_tos = 0;
2528         if (rt->rt6i_table)
2529                 table = rt->rt6i_table->tb6_id;
2530         else
2531                 table = RT6_TABLE_UNSPEC;
2532         rtm->rtm_table = table;
2533         if (nla_put_u32(skb, RTA_TABLE, table))
2534                 goto nla_put_failure;
2535         if (rt->rt6i_flags & RTF_REJECT) {
2536                 switch (rt->dst.error) {
2537                 case -EINVAL:
2538                         rtm->rtm_type = RTN_BLACKHOLE;
2539                         break;
2540                 case -EACCES:
2541                         rtm->rtm_type = RTN_PROHIBIT;
2542                         break;
2543                 case -EAGAIN:
2544                         rtm->rtm_type = RTN_THROW;
2545                         break;
2546                 default:
2547                         rtm->rtm_type = RTN_UNREACHABLE;
2548                         break;
2549                 }
2550         }
2551         else if (rt->rt6i_flags & RTF_LOCAL)
2552                 rtm->rtm_type = RTN_LOCAL;
2553         else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2554                 rtm->rtm_type = RTN_LOCAL;
2555         else
2556                 rtm->rtm_type = RTN_UNICAST;
2557         rtm->rtm_flags = 0;
2558         rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2559         rtm->rtm_protocol = rt->rt6i_protocol;
2560         if (rt->rt6i_flags & RTF_DYNAMIC)
2561                 rtm->rtm_protocol = RTPROT_REDIRECT;
2562         else if (rt->rt6i_flags & RTF_ADDRCONF) {
2563                 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2564                         rtm->rtm_protocol = RTPROT_RA;
2565                 else
2566                         rtm->rtm_protocol = RTPROT_KERNEL;
2567         }
2568
2569         if (rt->rt6i_flags & RTF_CACHE)
2570                 rtm->rtm_flags |= RTM_F_CLONED;
2571
2572         if (dst) {
2573                 if (nla_put(skb, RTA_DST, 16, dst))
2574                         goto nla_put_failure;
2575                 rtm->rtm_dst_len = 128;
2576         } else if (rtm->rtm_dst_len)
2577                 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2578                         goto nla_put_failure;
2579 #ifdef CONFIG_IPV6_SUBTREES
2580         if (src) {
2581                 if (nla_put(skb, RTA_SRC, 16, src))
2582                         goto nla_put_failure;
2583                 rtm->rtm_src_len = 128;
2584         } else if (rtm->rtm_src_len &&
2585                    nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2586                 goto nla_put_failure;
2587 #endif
2588         if (iif) {
2589 #ifdef CONFIG_IPV6_MROUTE
2590                 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2591                         int err = ip6mr_get_route(net, skb, rtm, nowait);
2592                         if (err <= 0) {
2593                                 if (!nowait) {
2594                                         if (err == 0)
2595                                                 return 0;
2596                                         goto nla_put_failure;
2597                                 } else {
2598                                         if (err == -EMSGSIZE)
2599                                                 goto nla_put_failure;
2600                                 }
2601                         }
2602                 } else
2603 #endif
2604                         if (nla_put_u32(skb, RTA_IIF, iif))
2605                                 goto nla_put_failure;
2606         } else if (dst) {
2607                 struct in6_addr saddr_buf;
2608                 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2609                     nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2610                         goto nla_put_failure;
2611         }
2612
2613         if (rt->rt6i_prefsrc.plen) {
2614                 struct in6_addr saddr_buf;
2615                 saddr_buf = rt->rt6i_prefsrc.addr;
2616                 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2617                         goto nla_put_failure;
2618         }
2619
2620         if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2621                 goto nla_put_failure;
2622
2623         if (rt->rt6i_flags & RTF_GATEWAY) {
2624                 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2625                         goto nla_put_failure;
2626         }
2627
2628         if (rt->dst.dev &&
2629             nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2630                 goto nla_put_failure;
2631         if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2632                 goto nla_put_failure;
2633
2634         expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2635
2636         if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2637                 goto nla_put_failure;
2638
2639         return nlmsg_end(skb, nlh);
2640
2641 nla_put_failure:
2642         nlmsg_cancel(skb, nlh);
2643         return -EMSGSIZE;
2644 }
2645
2646 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2647 {
2648         struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2649         int prefix;
2650
2651         if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2652                 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2653                 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2654         } else
2655                 prefix = 0;
2656
2657         return rt6_fill_node(arg->net,
2658                      arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2659                      NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2660                      prefix, 0, NLM_F_MULTI);
2661 }
2662
2663 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2664 {
2665         struct net *net = sock_net(in_skb->sk);
2666         struct nlattr *tb[RTA_MAX+1];
2667         struct rt6_info *rt;
2668         struct sk_buff *skb;
2669         struct rtmsg *rtm;
2670         struct flowi6 fl6;
2671         int err, iif = 0, oif = 0;
2672
2673         err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2674         if (err < 0)
2675                 goto errout;
2676
2677         err = -EINVAL;
2678         memset(&fl6, 0, sizeof(fl6));
2679
2680         if (tb[RTA_SRC]) {
2681                 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2682                         goto errout;
2683
2684                 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2685         }
2686
2687         if (tb[RTA_DST]) {
2688                 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2689                         goto errout;
2690
2691                 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2692         }
2693
2694         if (tb[RTA_IIF])
2695                 iif = nla_get_u32(tb[RTA_IIF]);
2696
2697         if (tb[RTA_OIF])
2698                 oif = nla_get_u32(tb[RTA_OIF]);
2699
2700         if (iif) {
2701                 struct net_device *dev;
2702                 int flags = 0;
2703
2704                 dev = __dev_get_by_index(net, iif);
2705                 if (!dev) {
2706                         err = -ENODEV;
2707                         goto errout;
2708                 }
2709
2710                 fl6.flowi6_iif = iif;
2711
2712                 if (!ipv6_addr_any(&fl6.saddr))
2713                         flags |= RT6_LOOKUP_F_HAS_SADDR;
2714
2715                 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2716                                                                flags);
2717         } else {
2718                 fl6.flowi6_oif = oif;
2719
2720                 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2721         }
2722
2723         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2724         if (!skb) {
2725                 ip6_rt_put(rt);
2726                 err = -ENOBUFS;
2727                 goto errout;
2728         }
2729
2730         /* Reserve room for dummy headers, this skb can pass
2731            through good chunk of routing engine.
2732          */
2733         skb_reset_mac_header(skb);
2734         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2735
2736         skb_dst_set(skb, &rt->dst);
2737
2738         err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2739                             RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2740                             nlh->nlmsg_seq, 0, 0, 0);
2741         if (err < 0) {
2742                 kfree_skb(skb);
2743                 goto errout;
2744         }
2745
2746         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2747 errout:
2748         return err;
2749 }
2750
2751 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2752 {
2753         struct sk_buff *skb;
2754         struct net *net = info->nl_net;
2755         u32 seq;
2756         int err;
2757
2758         err = -ENOBUFS;
2759         seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2760
2761         skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2762         if (!skb)
2763                 goto errout;
2764
2765         err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2766                                 event, info->portid, seq, 0, 0, 0);
2767         if (err < 0) {
2768                 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2769                 WARN_ON(err == -EMSGSIZE);
2770                 kfree_skb(skb);
2771                 goto errout;
2772         }
2773         rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2774                     info->nlh, gfp_any());
2775         return;
2776 errout:
2777         if (err < 0)
2778                 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2779 }
2780
2781 static int ip6_route_dev_notify(struct notifier_block *this,
2782                                 unsigned long event, void *ptr)
2783 {
2784         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2785         struct net *net = dev_net(dev);
2786
2787         if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2788                 net->ipv6.ip6_null_entry->dst.dev = dev;
2789                 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2790 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2791                 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2792                 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2793                 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2794                 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2795 #endif
2796         }
2797
2798         return NOTIFY_OK;
2799 }
2800
2801 /*
2802  *      /proc
2803  */
2804
2805 #ifdef CONFIG_PROC_FS
2806
2807 struct rt6_proc_arg
2808 {
2809         char *buffer;
2810         int offset;
2811         int length;
2812         int skip;
2813         int len;
2814 };
2815
2816 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2817 {
2818         struct seq_file *m = p_arg;
2819
2820         seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2821
2822 #ifdef CONFIG_IPV6_SUBTREES
2823         seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2824 #else
2825         seq_puts(m, "00000000000000000000000000000000 00 ");
2826 #endif
2827         if (rt->rt6i_flags & RTF_GATEWAY) {
2828                 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2829         } else {
2830                 seq_puts(m, "00000000000000000000000000000000");
2831         }
2832         seq_printf(m, " %08x %08x %08x %08x %8s\n",
2833                    rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2834                    rt->dst.__use, rt->rt6i_flags,
2835                    rt->dst.dev ? rt->dst.dev->name : "");
2836         return 0;
2837 }
2838
2839 static int ipv6_route_show(struct seq_file *m, void *v)
2840 {
2841         struct net *net = (struct net *)m->private;
2842         fib6_clean_all_ro(net, rt6_info_route, 0, m);
2843         return 0;
2844 }
2845
2846 static int ipv6_route_open(struct inode *inode, struct file *file)
2847 {
2848         return single_open_net(inode, file, ipv6_route_show);
2849 }
2850
2851 static const struct file_operations ipv6_route_proc_fops = {
2852         .owner          = THIS_MODULE,
2853         .open           = ipv6_route_open,
2854         .read           = seq_read,
2855         .llseek         = seq_lseek,
2856         .release        = single_release_net,
2857 };
2858
2859 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2860 {
2861         struct net *net = (struct net *)seq->private;
2862         seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2863                    net->ipv6.rt6_stats->fib_nodes,
2864                    net->ipv6.rt6_stats->fib_route_nodes,
2865                    net->ipv6.rt6_stats->fib_rt_alloc,
2866                    net->ipv6.rt6_stats->fib_rt_entries,
2867                    net->ipv6.rt6_stats->fib_rt_cache,
2868                    dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2869                    net->ipv6.rt6_stats->fib_discarded_routes);
2870
2871         return 0;
2872 }
2873
2874 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2875 {
2876         return single_open_net(inode, file, rt6_stats_seq_show);
2877 }
2878
2879 static const struct file_operations rt6_stats_seq_fops = {
2880         .owner   = THIS_MODULE,
2881         .open    = rt6_stats_seq_open,
2882         .read    = seq_read,
2883         .llseek  = seq_lseek,
2884         .release = single_release_net,
2885 };
2886 #endif  /* CONFIG_PROC_FS */
2887
2888 #ifdef CONFIG_SYSCTL
2889
2890 static
2891 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2892                               void __user *buffer, size_t *lenp, loff_t *ppos)
2893 {
2894         struct net *net;
2895         int delay;
2896         if (!write)
2897                 return -EINVAL;
2898
2899         net = (struct net *)ctl->extra1;
2900         delay = net->ipv6.sysctl.flush_delay;
2901         proc_dointvec(ctl, write, buffer, lenp, ppos);
2902         fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2903         return 0;
2904 }
2905
2906 struct ctl_table ipv6_route_table_template[] = {
2907         {
2908                 .procname       =       "flush",
2909                 .data           =       &init_net.ipv6.sysctl.flush_delay,
2910                 .maxlen         =       sizeof(int),
2911                 .mode           =       0200,
2912                 .proc_handler   =       ipv6_sysctl_rtcache_flush
2913         },
2914         {
2915                 .procname       =       "gc_thresh",
2916                 .data           =       &ip6_dst_ops_template.gc_thresh,
2917                 .maxlen         =       sizeof(int),
2918                 .mode           =       0644,
2919                 .proc_handler   =       proc_dointvec,
2920         },
2921         {
2922                 .procname       =       "max_size",
2923                 .data           =       &init_net.ipv6.sysctl.ip6_rt_max_size,
2924                 .maxlen         =       sizeof(int),
2925                 .mode           =       0644,
2926                 .proc_handler   =       proc_dointvec,
2927         },
2928         {
2929                 .procname       =       "gc_min_interval",
2930                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2931                 .maxlen         =       sizeof(int),
2932                 .mode           =       0644,
2933                 .proc_handler   =       proc_dointvec_jiffies,
2934         },
2935         {
2936                 .procname       =       "gc_timeout",
2937                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2938                 .maxlen         =       sizeof(int),
2939                 .mode           =       0644,
2940                 .proc_handler   =       proc_dointvec_jiffies,
2941         },
2942         {
2943                 .procname       =       "gc_interval",
2944                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2945                 .maxlen         =       sizeof(int),
2946                 .mode           =       0644,
2947                 .proc_handler   =       proc_dointvec_jiffies,
2948         },
2949         {
2950                 .procname       =       "gc_elasticity",
2951                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2952                 .maxlen         =       sizeof(int),
2953                 .mode           =       0644,
2954                 .proc_handler   =       proc_dointvec,
2955         },
2956         {
2957                 .procname       =       "mtu_expires",
2958                 .data           =       &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2959                 .maxlen         =       sizeof(int),
2960                 .mode           =       0644,
2961                 .proc_handler   =       proc_dointvec_jiffies,
2962         },
2963         {
2964                 .procname       =       "min_adv_mss",
2965                 .data           =       &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2966                 .maxlen         =       sizeof(int),
2967                 .mode           =       0644,
2968                 .proc_handler   =       proc_dointvec,
2969         },
2970         {
2971                 .procname       =       "gc_min_interval_ms",
2972                 .data           =       &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2973                 .maxlen         =       sizeof(int),
2974                 .mode           =       0644,
2975                 .proc_handler   =       proc_dointvec_ms_jiffies,
2976         },
2977         { }
2978 };
2979
2980 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2981 {
2982         struct ctl_table *table;
2983
2984         table = kmemdup(ipv6_route_table_template,
2985                         sizeof(ipv6_route_table_template),
2986                         GFP_KERNEL);
2987
2988         if (table) {
2989                 table[0].data = &net->ipv6.sysctl.flush_delay;
2990                 table[0].extra1 = net;
2991                 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2992                 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2993                 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2994                 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2995                 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2996                 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2997                 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2998                 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2999                 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3000
3001                 /* Don't export sysctls to unprivileged users */
3002                 if (net->user_ns != &init_user_ns)
3003                         table[0].procname = NULL;
3004         }
3005
3006         return table;
3007 }
3008 #endif
3009
3010 static int __net_init ip6_route_net_init(struct net *net)
3011 {
3012         int ret = -ENOMEM;
3013
3014         memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3015                sizeof(net->ipv6.ip6_dst_ops));
3016
3017         if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3018                 goto out_ip6_dst_ops;
3019
3020         net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3021                                            sizeof(*net->ipv6.ip6_null_entry),
3022                                            GFP_KERNEL);
3023         if (!net->ipv6.ip6_null_entry)
3024                 goto out_ip6_dst_entries;
3025         net->ipv6.ip6_null_entry->dst.path =
3026                 (struct dst_entry *)net->ipv6.ip6_null_entry;
3027         net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3028         dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3029                          ip6_template_metrics, true);
3030
3031 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3032         net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3033                                                sizeof(*net->ipv6.ip6_prohibit_entry),
3034                                                GFP_KERNEL);
3035         if (!net->ipv6.ip6_prohibit_entry)
3036                 goto out_ip6_null_entry;
3037         net->ipv6.ip6_prohibit_entry->dst.path =
3038                 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3039         net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3040         dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3041                          ip6_template_metrics, true);
3042
3043         net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3044                                                sizeof(*net->ipv6.ip6_blk_hole_entry),
3045                                                GFP_KERNEL);
3046         if (!net->ipv6.ip6_blk_hole_entry)
3047                 goto out_ip6_prohibit_entry;
3048         net->ipv6.ip6_blk_hole_entry->dst.path =
3049                 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3050         net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3051         dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3052                          ip6_template_metrics, true);
3053 #endif
3054
3055         net->ipv6.sysctl.flush_delay = 0;
3056         net->ipv6.sysctl.ip6_rt_max_size = 4096;
3057         net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3058         net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3059         net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3060         net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3061         net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3062         net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3063
3064         net->ipv6.ip6_rt_gc_expire = 30*HZ;
3065
3066         ret = 0;
3067 out:
3068         return ret;
3069
3070 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3071 out_ip6_prohibit_entry:
3072         kfree(net->ipv6.ip6_prohibit_entry);
3073 out_ip6_null_entry:
3074         kfree(net->ipv6.ip6_null_entry);
3075 #endif
3076 out_ip6_dst_entries:
3077         dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3078 out_ip6_dst_ops:
3079         goto out;
3080 }
3081
3082 static void __net_exit ip6_route_net_exit(struct net *net)
3083 {
3084         kfree(net->ipv6.ip6_null_entry);
3085 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3086         kfree(net->ipv6.ip6_prohibit_entry);
3087         kfree(net->ipv6.ip6_blk_hole_entry);
3088 #endif
3089         dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3090 }
3091
3092 static int __net_init ip6_route_net_init_late(struct net *net)
3093 {
3094 #ifdef CONFIG_PROC_FS
3095         proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3096         proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3097 #endif
3098         return 0;
3099 }
3100
3101 static void __net_exit ip6_route_net_exit_late(struct net *net)
3102 {
3103 #ifdef CONFIG_PROC_FS
3104         remove_proc_entry("ipv6_route", net->proc_net);
3105         remove_proc_entry("rt6_stats", net->proc_net);
3106 #endif
3107 }
3108
3109 static struct pernet_operations ip6_route_net_ops = {
3110         .init = ip6_route_net_init,
3111         .exit = ip6_route_net_exit,
3112 };
3113
3114 static int __net_init ipv6_inetpeer_init(struct net *net)
3115 {
3116         struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3117
3118         if (!bp)
3119                 return -ENOMEM;
3120         inet_peer_base_init(bp);
3121         net->ipv6.peers = bp;
3122         return 0;
3123 }
3124
3125 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3126 {
3127         struct inet_peer_base *bp = net->ipv6.peers;
3128
3129         net->ipv6.peers = NULL;
3130         inetpeer_invalidate_tree(bp);
3131         kfree(bp);
3132 }
3133
3134 static struct pernet_operations ipv6_inetpeer_ops = {
3135         .init   =       ipv6_inetpeer_init,
3136         .exit   =       ipv6_inetpeer_exit,
3137 };
3138
3139 static struct pernet_operations ip6_route_net_late_ops = {
3140         .init = ip6_route_net_init_late,
3141         .exit = ip6_route_net_exit_late,
3142 };
3143
3144 static struct notifier_block ip6_route_dev_notifier = {
3145         .notifier_call = ip6_route_dev_notify,
3146         .priority = 0,
3147 };
3148
3149 int __init ip6_route_init(void)
3150 {
3151         int ret;
3152
3153         ret = -ENOMEM;
3154         ip6_dst_ops_template.kmem_cachep =
3155                 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3156                                   SLAB_HWCACHE_ALIGN, NULL);
3157         if (!ip6_dst_ops_template.kmem_cachep)
3158                 goto out;
3159
3160         ret = dst_entries_init(&ip6_dst_blackhole_ops);
3161         if (ret)
3162                 goto out_kmem_cache;
3163
3164         ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3165         if (ret)
3166                 goto out_dst_entries;
3167
3168         ret = register_pernet_subsys(&ip6_route_net_ops);
3169         if (ret)
3170                 goto out_register_inetpeer;
3171
3172         ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3173
3174         /* Registering of the loopback is done before this portion of code,
3175          * the loopback reference in rt6_info will not be taken, do it
3176          * manually for init_net */
3177         init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3178         init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3179   #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3180         init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3181         init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3182         init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3183         init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3184   #endif
3185         ret = fib6_init();
3186         if (ret)
3187                 goto out_register_subsys;
3188
3189         ret = xfrm6_init();
3190         if (ret)
3191                 goto out_fib6_init;
3192
3193         ret = fib6_rules_init();
3194         if (ret)
3195                 goto xfrm6_init;
3196
3197         ret = register_pernet_subsys(&ip6_route_net_late_ops);
3198         if (ret)
3199                 goto fib6_rules_init;
3200
3201         ret = -ENOBUFS;
3202         if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3203             __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3204             __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3205                 goto out_register_late_subsys;
3206
3207         ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3208         if (ret)
3209                 goto out_register_late_subsys;
3210
3211 out:
3212         return ret;
3213
3214 out_register_late_subsys:
3215         unregister_pernet_subsys(&ip6_route_net_late_ops);
3216 fib6_rules_init:
3217         fib6_rules_cleanup();
3218 xfrm6_init:
3219         xfrm6_fini();
3220 out_fib6_init:
3221         fib6_gc_cleanup();
3222 out_register_subsys:
3223         unregister_pernet_subsys(&ip6_route_net_ops);
3224 out_register_inetpeer:
3225         unregister_pernet_subsys(&ipv6_inetpeer_ops);
3226 out_dst_entries:
3227         dst_entries_destroy(&ip6_dst_blackhole_ops);
3228 out_kmem_cache:
3229         kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3230         goto out;
3231 }
3232
3233 void ip6_route_cleanup(void)
3234 {
3235         unregister_netdevice_notifier(&ip6_route_dev_notifier);
3236         unregister_pernet_subsys(&ip6_route_net_late_ops);
3237         fib6_rules_cleanup();
3238         xfrm6_fini();
3239         fib6_gc_cleanup();
3240         unregister_pernet_subsys(&ipv6_inetpeer_ops);
3241         unregister_pernet_subsys(&ip6_route_net_ops);
3242         dst_entries_destroy(&ip6_dst_blackhole_ops);
3243         kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3244 }