include/net/ipv6.h

   1 /*
   2  *      Linux INET6 implementation
   3  *
   4  *      Authors:
   5  *      Pedro Roque             <roque@di.fc.ul.pt>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _NET_IPV6_H
  14 #define _NET_IPV6_H
  15
  16 #include <linux/ipv6.h>
  17 #include <linux/hardirq.h>
  18 #include <net/if_inet6.h>
  19 #include <net/ndisc.h>
  20 #include <net/flow.h>
  21 #include <net/snmp.h>
  22
  23 #define SIN6_LEN_RFC2133        24
  24
  25 #define IPV6_MAXPLEN            65535
  26
  27 /*
  28  *      NextHeader field of IPv6 header
  29  */
  30
  31 #define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
  32 #define NEXTHDR_TCP             6       /* TCP segment. */
  33 #define NEXTHDR_UDP             17      /* UDP message. */
  34 #define NEXTHDR_IPV6            41      /* IPv6 in IPv6 */
  35 #define NEXTHDR_ROUTING         43      /* Routing header. */
  36 #define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly header. */
  37 #define NEXTHDR_ESP             50      /* Encapsulating security payload. */
  38 #define NEXTHDR_AUTH            51      /* Authentication header. */
  39 #define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
  40 #define NEXTHDR_NONE            59      /* No next header */
  41 #define NEXTHDR_DEST            60      /* Destination options header. */
  42 #define NEXTHDR_MOBILITY        135     /* Mobility header. */
  43
  44 #define NEXTHDR_MAX             255
  45
  46
  47
  48 #define IPV6_DEFAULT_HOPLIMIT   64
  49 #define IPV6_DEFAULT_MCASTHOPS  1
  50
  51 /*
  52  *      Addr type
  53  *
  54  *      type    -       unicast | multicast
  55  *      scope   -       local   | site      | global
  56  *      v4      -       compat
  57  *      v4mapped
  58  *      any
  59  *      loopback
  60  */
  61
  62 #define IPV6_ADDR_ANY           0x0000U
  63
  64 #define IPV6_ADDR_UNICAST       0x0001U
  65 #define IPV6_ADDR_MULTICAST     0x0002U
  66
  67 #define IPV6_ADDR_LOOPBACK      0x0010U
  68 #define IPV6_ADDR_LINKLOCAL     0x0020U
  69 #define IPV6_ADDR_SITELOCAL     0x0040U
  70
  71 #define IPV6_ADDR_COMPATv4      0x0080U
  72
  73 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
  74
  75 #define IPV6_ADDR_MAPPED        0x1000U
  76
  77 /*
  78  *      Addr scopes
  79  */
  80 #ifdef __KERNEL__
  81 #define IPV6_ADDR_MC_SCOPE(a)   \
  82         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  83 #define __IPV6_ADDR_SCOPE_INVALID       -1
  84 #endif
  85 #define IPV6_ADDR_SCOPE_NODELOCAL       0x01
  86 #define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
  87 #define IPV6_ADDR_SCOPE_SITELOCAL       0x05
  88 #define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
  89 #define IPV6_ADDR_SCOPE_GLOBAL          0x0e
  90
  91 /*
  92  *      fragmentation header
  93  */
  94
  95 struct frag_hdr {
  96         __u8    nexthdr;
  97         __u8    reserved;
  98         __be16  frag_off;
  99         __be32  identification;
 100 };
 101
 102 #define IP6_MF  0x0001
 103
 104 #ifdef __KERNEL__
 105
 106 #include <net/sock.h>
 107
 108 /* sysctls */
 109 extern int sysctl_mld_max_msf;
 110 extern struct ctl_path net_ipv6_ctl_path[];
 111
 112 #define _DEVINC(net, statname, modifier, idev, field)                   \
 113 ({                                                                      \
 114         struct inet6_dev *_idev = (idev);                               \
 115         if (likely(_idev != NULL))                                      \
 116                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 117         SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
 118 })
 119
 120 #define _DEVADD(net, statname, modifier, idev, field, val)              \
 121 ({                                                                      \
 122         struct inet6_dev *_idev = (idev);                               \
 123         if (likely(_idev != NULL))                                      \
 124                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 125         SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
 126 })
 127
 128 #define _DEVUPD(net, statname, modifier, idev, field, val)              \
 129 ({                                                                      \
 130         struct inet6_dev *_idev = (idev);                               \
 131         if (likely(_idev != NULL))                                      \
 132                 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
 133         SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
 134 })
 135
 136 /* MIBs */
 137
 138 #define IP6_INC_STATS(net, idev,field)          \
 139                 _DEVINC(net, ipv6, 64, idev, field)
 140 #define IP6_INC_STATS_BH(net, idev,field)       \
 141                 _DEVINC(net, ipv6, 64_BH, idev, field)
 142 #define IP6_ADD_STATS(net, idev,field,val)      \
 143                 _DEVADD(net, ipv6, 64, idev, field, val)
 144 #define IP6_ADD_STATS_BH(net, idev,field,val)   \
 145                 _DEVADD(net, ipv6, 64_BH, idev, field, val)
 146 #define IP6_UPD_PO_STATS(net, idev,field,val)   \
 147                 _DEVUPD(net, ipv6, 64, idev, field, val)
 148 #define IP6_UPD_PO_STATS_BH(net, idev,field,val)   \
 149                 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
 150 #define ICMP6_INC_STATS(net, idev, field)       \
 151                 _DEVINC(net, icmpv6, , idev, field)
 152 #define ICMP6_INC_STATS_BH(net, idev, field)    \
 153                 _DEVINC(net, icmpv6, _BH, idev, field)
 154
 155 #define ICMP6MSGOUT_INC_STATS(net, idev, field)         \
 156         _DEVINC(net, icmpv6msg, , idev, field +256)
 157 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field)      \
 158         _DEVINC(net, icmpv6msg, _BH, idev, field +256)
 159 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field)       \
 160         _DEVINC(net, icmpv6msg, _BH, idev, field)
 161
 162 struct ip6_ra_chain {
 163         struct ip6_ra_chain     *next;
 164         struct sock             *sk;
 165         int                     sel;
 166         void                    (*destructor)(struct sock *);
 167 };
 168
 169 extern struct ip6_ra_chain      *ip6_ra_chain;
 170 extern rwlock_t ip6_ra_lock;
 171
 172 /*
 173    This structure is prepared by protocol, when parsing
 174    ancillary data and passed to IPv6.
 175  */
 176
 177 struct ipv6_txoptions {
 178         /* Length of this structure */
 179         int                     tot_len;
 180
 181         /* length of extension headers   */
 182
 183         __u16                   opt_flen;       /* after fragment hdr */
 184         __u16                   opt_nflen;      /* before fragment hdr */
 185
 186         struct ipv6_opt_hdr     *hopopt;
 187         struct ipv6_opt_hdr     *dst0opt;
 188         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 189         struct ipv6_opt_hdr     *dst1opt;
 190
 191         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 192 };
 193
 194 struct ip6_flowlabel {
 195         struct ip6_flowlabel    *next;
 196         __be32                  label;
 197         atomic_t                users;
 198         struct in6_addr         dst;
 199         struct ipv6_txoptions   *opt;
 200         unsigned long           linger;
 201         u8                      share;
 202         u32                     owner;
 203         unsigned long           lastuse;
 204         unsigned long           expires;
 205         struct net              *fl_net;
 206 };
 207
 208 #define IPV6_FLOWINFO_MASK      cpu_to_be32(0x0FFFFFFF)
 209 #define IPV6_FLOWLABEL_MASK     cpu_to_be32(0x000FFFFF)
 210
 211 struct ipv6_fl_socklist {
 212         struct ipv6_fl_socklist *next;
 213         struct ip6_flowlabel    *fl;
 214 };
 215
 216 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 217 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 218                                                    struct ip6_flowlabel * fl,
 219                                                    struct ipv6_txoptions * fopt);
 220 extern void                     fl6_free_socklist(struct sock *sk);
 221 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 222 extern int                      ip6_flowlabel_init(void);
 223 extern void                     ip6_flowlabel_cleanup(void);
 224
 225 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 226 {
 227         if (fl)
 228                 atomic_dec(&fl->users);
 229 }
 230
 231 extern int                      ip6_ra_control(struct sock *sk, int sel);
 232
 233 extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 234
 235 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 236 extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 237                                                    int newtype,
 238                                                    struct ipv6_opt_hdr __user *newopt,
 239                                                    int newoptlen);
 240 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 241                                           struct ipv6_txoptions *opt);
 242
 243 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 244
 245 int ip6_frag_nqueues(struct net *net);
 246 int ip6_frag_mem(struct net *net);
 247
 248 #define IPV6_FRAG_HIGH_THRESH   (256 * 1024)    /* 262144 */
 249 #define IPV6_FRAG_LOW_THRESH    (192 * 1024)    /* 196608 */
 250 #define IPV6_FRAG_TIMEOUT       (60 * HZ)       /* 60 seconds */
 251
 252 extern int __ipv6_addr_type(const struct in6_addr *addr);
 253 static inline int ipv6_addr_type(const struct in6_addr *addr)
 254 {
 255         return __ipv6_addr_type(addr) & 0xffff;
 256 }
 257
 258 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 259 {
 260         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 261 }
 262
 263 static inline int __ipv6_addr_src_scope(int type)
 264 {
 265         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 266 }
 267
 268 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 269 {
 270         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 271 }
 272
 273 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 274 {
 275         return memcmp(a1, a2, sizeof(struct in6_addr));
 276 }
 277
 278 static inline int
 279 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 280                      const struct in6_addr *a2)
 281 {
 282         return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
 283                    ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
 284                    ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
 285                    ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
 286 }
 287
 288 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 289 {
 290         memcpy(a1, a2, sizeof(struct in6_addr));
 291 }
 292
 293 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 294                                     const struct in6_addr *addr,
 295                                     int plen)
 296 {
 297         /* caller must guarantee 0 <= plen <= 128 */
 298         int o = plen >> 3,
 299             b = plen & 0x7;
 300
 301         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 302         memcpy(pfx->s6_addr, addr, o);
 303         if (b != 0)
 304                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 305 }
 306
 307 static inline void ipv6_addr_set(struct in6_addr *addr,
 308                                      __be32 w1, __be32 w2,
 309                                      __be32 w3, __be32 w4)
 310 {
 311         addr->s6_addr32[0] = w1;
 312         addr->s6_addr32[1] = w2;
 313         addr->s6_addr32[2] = w3;
 314         addr->s6_addr32[3] = w4;
 315 }
 316
 317 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 318                                   const struct in6_addr *a2)
 319 {
 320         return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
 321                  (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
 322                  (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
 323                  (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
 324 }
 325
 326 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 327                                       unsigned int prefixlen)
 328 {
 329         unsigned pdw, pbi;
 330
 331         /* check complete u32 in prefix */
 332         pdw = prefixlen >> 5;
 333         if (pdw && memcmp(a1, a2, pdw << 2))
 334                 return 0;
 335
 336         /* check incomplete u32 in prefix */
 337         pbi = prefixlen & 0x1f;
 338         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 339                 return 0;
 340
 341         return 1;
 342 }
 343
 344 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 345                                     const struct in6_addr *a2,
 346                                     unsigned int prefixlen)
 347 {
 348         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 349                                    prefixlen);
 350 }
 351
 352 struct inet_frag_queue;
 353
 354 enum ip6_defrag_users {
 355         IP6_DEFRAG_LOCAL_DELIVER,
 356         IP6_DEFRAG_CONNTRACK_IN,
 357         __IP6_DEFRAG_CONNTRACK_IN       = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
 358         IP6_DEFRAG_CONNTRACK_OUT,
 359         __IP6_DEFRAG_CONNTRACK_OUT      = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
 360         IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
 361         __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
 362 };
 363
 364 struct ip6_create_arg {
 365         __be32 id;
 366         u32 user;
 367         struct in6_addr *src;
 368         struct in6_addr *dst;
 369 };
 370
 371 void ip6_frag_init(struct inet_frag_queue *q, void *a);
 372 int ip6_frag_match(struct inet_frag_queue *q, void *a);
 373
 374 static inline int ipv6_addr_any(const struct in6_addr *a)
 375 {
 376         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 377                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 378 }
 379
 380 static inline int ipv6_addr_loopback(const struct in6_addr *a)
 381 {
 382         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 383                  a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
 384 }
 385
 386 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
 387 {
 388         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 389                  (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
 390 }
 391
 392 /*
 393  * Check for a RFC 4843 ORCHID address
 394  * (Overlay Routable Cryptographic Hash Identifiers)
 395  */
 396 static inline int ipv6_addr_orchid(const struct in6_addr *a)
 397 {
 398         return ((a->s6_addr32[0] & htonl(0xfffffff0))
 399                 == htonl(0x20010010));
 400 }
 401
 402 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
 403                                           struct in6_addr *v4mapped)
 404 {
 405         ipv6_addr_set(v4mapped,
 406                         0, 0,
 407                         htonl(0x0000FFFF),
 408                         addr);
 409 }
 410
 411 /*
 412  * find the first different bit between two addresses
 413  * length of address must be a multiple of 32bits
 414  */
 415 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 416 {
 417         const __be32 *a1 = token1, *a2 = token2;
 418         int i;
 419
 420         addrlen >>= 2;
 421
 422         for (i = 0; i < addrlen; i++) {
 423                 __be32 xb = a1[i] ^ a2[i];
 424                 if (xb)
 425                         return i * 32 + 31 - __fls(ntohl(xb));
 426         }
 427
 428         /*
 429          *      we should *never* get to this point since that
 430          *      would mean the addrs are equal
 431          *
 432          *      However, we do get to it 8) And exacly, when
 433          *      addresses are equal 8)
 434          *
 435          *      ip route add 1111::/128 via ...
 436          *      ip route add 1111::/64 via ...
 437          *      and we are here.
 438          *
 439          *      Ideally, this function should stop comparison
 440          *      at prefix length. It does not, but it is still OK,
 441          *      if returned value is greater than prefix length.
 442          *                                      --ANK (980803)
 443          */
 444         return (addrlen << 5);
 445 }
 446
 447 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 448 {
 449         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 450 }
 451
 452 static __inline__ void ipv6_select_ident(struct frag_hdr *fhdr)
 453 {
 454         static u32 ipv6_fragmentation_id = 1;
 455         static DEFINE_SPINLOCK(ip6_id_lock);
 456
 457         spin_lock_bh(&ip6_id_lock);
 458         fhdr->identification = htonl(ipv6_fragmentation_id);
 459         if (++ipv6_fragmentation_id == 0)
 460                 ipv6_fragmentation_id = 1;
 461         spin_unlock_bh(&ip6_id_lock);
 462 }
 463
 464 /*
 465  *      Prototypes exported by ipv6
 466  */
 467
 468 /*
 469  *      rcv function (called from netdevice level)
 470  */
 471
 472 extern int                      ipv6_rcv(struct sk_buff *skb,
 473                                          struct net_device *dev,
 474                                          struct packet_type *pt,
 475                                          struct net_device *orig_dev);
 476
 477 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 478
 479 /*
 480  *      upper-layer output functions
 481  */
 482 extern int                      ip6_xmit(struct sock *sk,
 483                                          struct sk_buff *skb,
 484                                          struct flowi *fl,
 485                                          struct ipv6_txoptions *opt);
 486
 487 extern int                      ip6_nd_hdr(struct sock *sk,
 488                                            struct sk_buff *skb,
 489                                            struct net_device *dev,
 490                                            const struct in6_addr *saddr,
 491                                            const struct in6_addr *daddr,
 492                                            int proto, int len);
 493
 494 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 495
 496 extern int                      ip6_append_data(struct sock *sk,
 497                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 498                                                 void *from,
 499                                                 int length,
 500                                                 int transhdrlen,
 501                                                 int hlimit,
 502                                                 int tclass,
 503                                                 struct ipv6_txoptions *opt,
 504                                                 struct flowi *fl,
 505                                                 struct rt6_info *rt,
 506                                                 unsigned int flags,
 507                                                 int dontfrag);
 508
 509 extern int                      ip6_push_pending_frames(struct sock *sk);
 510
 511 extern void                     ip6_flush_pending_frames(struct sock *sk);
 512
 513 extern int                      ip6_dst_lookup(struct sock *sk,
 514                                                struct dst_entry **dst,
 515                                                struct flowi *fl);
 516 extern int                      ip6_dst_blackhole(struct sock *sk,
 517                                                   struct dst_entry **dst,
 518                                                   struct flowi *fl);
 519 extern int                      ip6_sk_dst_lookup(struct sock *sk,
 520                                                   struct dst_entry **dst,
 521                                                   struct flowi *fl);
 522
 523 /*
 524  *      skb processing functions
 525  */
 526
 527 extern int                      ip6_output(struct sk_buff *skb);
 528 extern int                      ip6_forward(struct sk_buff *skb);
 529 extern int                      ip6_input(struct sk_buff *skb);
 530 extern int                      ip6_mc_input(struct sk_buff *skb);
 531
 532 extern int                      __ip6_local_out(struct sk_buff *skb);
 533 extern int                      ip6_local_out(struct sk_buff *skb);
 534
 535 /*
 536  *      Extension header (options) processing
 537  */
 538
 539 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 540                                                      struct ipv6_txoptions *opt,
 541                                                      u8 *proto,
 542                                                      struct in6_addr **daddr_p);
 543 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 544                                                     struct ipv6_txoptions *opt,
 545                                                     u8 *proto);
 546
 547 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 548                                                  u8 *nexthdrp);
 549
 550 extern int                      ipv6_ext_hdr(u8 nexthdr);
 551
 552 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 553
 554 extern struct in6_addr *fl6_update_dst(struct flowi *fl,
 555                                        const struct ipv6_txoptions *opt,
 556                                        struct in6_addr *orig);
 557
 558 /*
 559  *      socket options (ipv6_sockglue.c)
 560  */
 561
 562 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 563                                                 int optname,
 564                                                 char __user *optval,
 565                                                 unsigned int optlen);
 566 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 567                                                 int optname,
 568                                                 char __user *optval,
 569                                                 int __user *optlen);
 570 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 571                                                 int level,
 572                                                 int optname,
 573                                                 char __user *optval,
 574                                                 unsigned int optlen);
 575 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 576                                                 int level,
 577                                                 int optname,
 578                                                 char __user *optval,
 579                                                 int __user *optlen);
 580
 581 extern int                      ip6_datagram_connect(struct sock *sk,
 582                                                      struct sockaddr *addr, int addr_len);
 583
 584 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 585 extern int                      ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
 586 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 587                                                 u32 info, u8 *payload);
 588 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 589 extern void                     ipv6_local_rxpmtu(struct sock *sk, struct flowi *fl, u32 mtu);
 590
 591 extern int inet6_release(struct socket *sock);
 592 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 593                       int addr_len);
 594 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 595                          int *uaddr_len, int peer);
 596 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 597                        unsigned long arg);
 598
 599 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 600                               struct sock *sk);
 601
 602 /*
 603  * reassembly.c
 604  */
 605 extern const struct proto_ops inet6_stream_ops;
 606 extern const struct proto_ops inet6_dgram_ops;
 607
 608 struct group_source_req;
 609 struct group_filter;
 610
 611 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 612                          struct group_source_req *pgsr);
 613 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 614 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 615                          struct group_filter __user *optval,
 616                          int __user *optlen);
 617 extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
 618                                     const struct in6_addr *daddr, u32 rnd);
 619
 620 #ifdef CONFIG_PROC_FS
 621 extern int  ac6_proc_init(struct net *net);
 622 extern void ac6_proc_exit(struct net *net);
 623 extern int  raw6_proc_init(void);
 624 extern void raw6_proc_exit(void);
 625 extern int  tcp6_proc_init(struct net *net);
 626 extern void tcp6_proc_exit(struct net *net);
 627 extern int  udp6_proc_init(struct net *net);
 628 extern void udp6_proc_exit(struct net *net);
 629 extern int  udplite6_proc_init(void);
 630 extern void udplite6_proc_exit(void);
 631 extern int  ipv6_misc_proc_init(void);
 632 extern void ipv6_misc_proc_exit(void);
 633 extern int snmp6_register_dev(struct inet6_dev *idev);
 634 extern int snmp6_unregister_dev(struct inet6_dev *idev);
 635
 636 #else
 637 static inline int ac6_proc_init(struct net *net) { return 0; }
 638 static inline void ac6_proc_exit(struct net *net) { }
 639 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
 640 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
 641 #endif
 642
 643 #ifdef CONFIG_SYSCTL
 644 extern ctl_table ipv6_route_table_template[];
 645 extern ctl_table ipv6_icmp_table_template[];
 646
 647 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
 648 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
 649 extern int ipv6_sysctl_register(void);
 650 extern void ipv6_sysctl_unregister(void);
 651 extern int ipv6_static_sysctl_register(void);
 652 extern void ipv6_static_sysctl_unregister(void);
 653 #endif
 654
 655 #endif /* __KERNEL__ */
 656 #endif /* _NET_IPV6_H */