include/net/ipv6.h

   1 /*
   2  *      Linux INET6 implementation
   3  *
   4  *      Authors:
   5  *      Pedro Roque             <roque@di.fc.ul.pt>
   6  *
   7  *      $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #ifndef _NET_IPV6_H
  16 #define _NET_IPV6_H
  17
  18 #include <linux/ipv6.h>
  19 #include <linux/hardirq.h>
  20 #include <net/if_inet6.h>
  21 #include <net/ndisc.h>
  22 #include <net/flow.h>
  23 #include <net/snmp.h>
  24
  25 #define SIN6_LEN_RFC2133        24
  26
  27 #define IPV6_MAXPLEN            65535
  28
  29 /*
  30  *      NextHeader field of IPv6 header
  31  */
  32
  33 #define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
  34 #define NEXTHDR_TCP             6       /* TCP segment. */
  35 #define NEXTHDR_UDP             17      /* UDP message. */
  36 #define NEXTHDR_IPV6            41      /* IPv6 in IPv6 */
  37 #define NEXTHDR_ROUTING         43      /* Routing header. */
  38 #define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly header. */
  39 #define NEXTHDR_ESP             50      /* Encapsulating security payload. */
  40 #define NEXTHDR_AUTH            51      /* Authentication header. */
  41 #define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
  42 #define NEXTHDR_NONE            59      /* No next header */
  43 #define NEXTHDR_DEST            60      /* Destination options header. */
  44 #define NEXTHDR_MOBILITY        135     /* Mobility header. */
  45
  46 #define NEXTHDR_MAX             255
  47
  48
  49
  50 #define IPV6_DEFAULT_HOPLIMIT   64
  51 #define IPV6_DEFAULT_MCASTHOPS  1
  52
  53 /*
  54  *      Addr type
  55  *
  56  *      type    -       unicast | multicast
  57  *      scope   -       local   | site      | global
  58  *      v4      -       compat
  59  *      v4mapped
  60  *      any
  61  *      loopback
  62  */
  63
  64 #define IPV6_ADDR_ANY           0x0000U
  65
  66 #define IPV6_ADDR_UNICAST       0x0001U
  67 #define IPV6_ADDR_MULTICAST     0x0002U
  68
  69 #define IPV6_ADDR_LOOPBACK      0x0010U
  70 #define IPV6_ADDR_LINKLOCAL     0x0020U
  71 #define IPV6_ADDR_SITELOCAL     0x0040U
  72
  73 #define IPV6_ADDR_COMPATv4      0x0080U
  74
  75 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
  76
  77 #define IPV6_ADDR_MAPPED        0x1000U
  78 #define IPV6_ADDR_RESERVED      0x2000U /* reserved address space */
  79
  80 /*
  81  *      Addr scopes
  82  */
  83 #ifdef __KERNEL__
  84 #define IPV6_ADDR_MC_SCOPE(a)   \
  85         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  86 #define __IPV6_ADDR_SCOPE_INVALID       -1
  87 #endif
  88 #define IPV6_ADDR_SCOPE_NODELOCAL       0x01
  89 #define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
  90 #define IPV6_ADDR_SCOPE_SITELOCAL       0x05
  91 #define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
  92 #define IPV6_ADDR_SCOPE_GLOBAL          0x0e
  93
  94 /*
  95  *      fragmentation header
  96  */
  97
  98 struct frag_hdr {
  99         __u8    nexthdr;
 100         __u8    reserved;
 101         __be16  frag_off;
 102         __be32  identification;
 103 };
 104
 105 #define IP6_MF  0x0001
 106
 107 #ifdef __KERNEL__
 108
 109 #include <net/sock.h>
 110
 111 /* sysctls */
 112 extern int sysctl_ipv6_bindv6only;
 113 extern int sysctl_mld_max_msf;
 114
 115 #define _DEVINC(statname, modifier, idev, field)                        \
 116 ({                                                                      \
 117         struct inet6_dev *_idev = (idev);                               \
 118         if (likely(_idev != NULL))                                      \
 119                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 120         SNMP_INC_STATS##modifier(statname##_statistics, (field));       \
 121 })
 122
 123 #define _DEVADD(statname, modifier, idev, field, val)                   \
 124 ({                                                                      \
 125         struct inet6_dev *_idev = (idev);                               \
 126         if (likely(_idev != NULL))                                      \
 127                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 128         SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
 129 })
 130
 131 /* MIBs */
 132 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 133
 134 #define IP6_INC_STATS(idev,field)       _DEVINC(ipv6, , idev, field)
 135 #define IP6_INC_STATS_BH(idev,field)    _DEVINC(ipv6, _BH, idev, field)
 136 #define IP6_INC_STATS_USER(idev,field)  _DEVINC(ipv6, _USER, idev, field)
 137 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
 138
 139 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 140 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
 141
 142 #define ICMP6_INC_STATS(idev, field)    _DEVINC(icmpv6, , idev, field)
 143 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
 144 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
 145
 146 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)  ({                      \
 147         struct inet6_dev *_idev = idev;                                         \
 148         __typeof__(offset) _offset = (offset);                                  \
 149         if (likely(_idev != NULL))                                              \
 150                 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);  \
 151         SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);            \
 152 })
 153
 154 #define ICMP6MSGOUT_INC_STATS(idev, field) \
 155         _DEVINC(icmpv6msg, , idev, field +256)
 156 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
 157         _DEVINC(icmpv6msg, _BH, idev, field +256)
 158 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
 159         _DEVINC(icmpv6msg, _USER, idev, field +256)
 160 #define ICMP6MSGIN_INC_STATS(idev, field) \
 161          _DEVINC(icmpv6msg, , idev, field)
 162 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
 163         _DEVINC(icmpv6msg, _BH, idev, field)
 164 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
 165         _DEVINC(icmpv6msg, _USER, idev, field)
 166
 167 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 168 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
 169 #define UDP6_INC_STATS_BH(field, is_udplite)                          do  {  \
 170         if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field);         \
 171         else            SNMP_INC_STATS_BH(udp_stats_in6, field);    } while(0)
 172 #define UDP6_INC_STATS_USER(field, is_udplite)                         do {    \
 173         if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field);         \
 174         else            SNMP_INC_STATS_USER(udp_stats_in6, field);    } while(0)
 175
 176 struct ip6_ra_chain
 177 {
 178         struct ip6_ra_chain     *next;
 179         struct sock             *sk;
 180         int                     sel;
 181         void                    (*destructor)(struct sock *);
 182 };
 183
 184 extern struct ip6_ra_chain      *ip6_ra_chain;
 185 extern rwlock_t ip6_ra_lock;
 186
 187 /*
 188    This structure is prepared by protocol, when parsing
 189    ancillary data and passed to IPv6.
 190  */
 191
 192 struct ipv6_txoptions
 193 {
 194         /* Length of this structure */
 195         int                     tot_len;
 196
 197         /* length of extension headers   */
 198
 199         __u16                   opt_flen;       /* after fragment hdr */
 200         __u16                   opt_nflen;      /* before fragment hdr */
 201
 202         struct ipv6_opt_hdr     *hopopt;
 203         struct ipv6_opt_hdr     *dst0opt;
 204         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 205         struct ipv6_opt_hdr     *dst1opt;
 206
 207         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 208 };
 209
 210 struct ip6_flowlabel
 211 {
 212         struct ip6_flowlabel    *next;
 213         __be32                  label;
 214         atomic_t                users;
 215         struct in6_addr         dst;
 216         struct ipv6_txoptions   *opt;
 217         unsigned long           linger;
 218         u8                      share;
 219         u32                     owner;
 220         unsigned long           lastuse;
 221         unsigned long           expires;
 222 };
 223
 224 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 225 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 226
 227 struct ipv6_fl_socklist
 228 {
 229         struct ipv6_fl_socklist *next;
 230         struct ip6_flowlabel    *fl;
 231 };
 232
 233 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 234 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 235                                                    struct ip6_flowlabel * fl,
 236                                                    struct ipv6_txoptions * fopt);
 237 extern void                     fl6_free_socklist(struct sock *sk);
 238 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 239 extern void                     ip6_flowlabel_init(void);
 240 extern void                     ip6_flowlabel_cleanup(void);
 241
 242 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 243 {
 244         if (fl)
 245                 atomic_dec(&fl->users);
 246 }
 247
 248 extern int                      ip6_ra_control(struct sock *sk, int sel,
 249                                                void (*destructor)(struct sock *));
 250
 251
 252 extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 253
 254 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 255 extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 256                                                    int newtype,
 257                                                    struct ipv6_opt_hdr __user *newopt,
 258                                                    int newoptlen);
 259 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 260                                           struct ipv6_txoptions *opt);
 261
 262 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 263
 264 int ip6_frag_nqueues(void);
 265 int ip6_frag_mem(void);
 266
 267 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 268
 269 /*
 270  *      Function prototype for build_xmit
 271  */
 272
 273 typedef int             (*inet_getfrag_t) (const void *data,
 274                                            struct in6_addr *addr,
 275                                            char *,
 276                                            unsigned int, unsigned int);
 277
 278 extern int __ipv6_addr_type(const struct in6_addr *addr);
 279 static inline int ipv6_addr_type(const struct in6_addr *addr)
 280 {
 281         return __ipv6_addr_type(addr) & 0xffff;
 282 }
 283
 284 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 285 {
 286         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 287 }
 288
 289 static inline int __ipv6_addr_src_scope(int type)
 290 {
 291         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 292 }
 293
 294 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 295 {
 296         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 297 }
 298
 299 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 300 {
 301         return memcmp(a1, a2, sizeof(struct in6_addr));
 302 }
 303
 304 static inline int
 305 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 306                      const struct in6_addr *a2)
 307 {
 308         unsigned int i;
 309
 310         for (i = 0; i < 4; i++)
 311                 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
 312                         return 1;
 313         return 0;
 314 }
 315
 316 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 317 {
 318         memcpy(a1, a2, sizeof(struct in6_addr));
 319 }
 320
 321 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 322                                     const struct in6_addr *addr,
 323                                     int plen)
 324 {
 325         /* caller must guarantee 0 <= plen <= 128 */
 326         int o = plen >> 3,
 327             b = plen & 0x7;
 328
 329         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 330         memcpy(pfx->s6_addr, addr, o);
 331         if (b != 0)
 332                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 333 }
 334
 335 static inline void ipv6_addr_set(struct in6_addr *addr,
 336                                      __be32 w1, __be32 w2,
 337                                      __be32 w3, __be32 w4)
 338 {
 339         addr->s6_addr32[0] = w1;
 340         addr->s6_addr32[1] = w2;
 341         addr->s6_addr32[2] = w3;
 342         addr->s6_addr32[3] = w4;
 343 }
 344
 345 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 346                                   const struct in6_addr *a2)
 347 {
 348         return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 349                 a1->s6_addr32[1] == a2->s6_addr32[1] &&
 350                 a1->s6_addr32[2] == a2->s6_addr32[2] &&
 351                 a1->s6_addr32[3] == a2->s6_addr32[3]);
 352 }
 353
 354 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 355                                       unsigned int prefixlen)
 356 {
 357         unsigned pdw, pbi;
 358
 359         /* check complete u32 in prefix */
 360         pdw = prefixlen >> 5;
 361         if (pdw && memcmp(a1, a2, pdw << 2))
 362                 return 0;
 363
 364         /* check incomplete u32 in prefix */
 365         pbi = prefixlen & 0x1f;
 366         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 367                 return 0;
 368
 369         return 1;
 370 }
 371
 372 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 373                                     const struct in6_addr *a2,
 374                                     unsigned int prefixlen)
 375 {
 376         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 377                                    prefixlen);
 378 }
 379
 380 struct inet_frag_queue;
 381 int ip6_frag_equal(struct inet_frag_queue *q1, struct inet_frag_queue *q2);
 382
 383 struct ip6_create_arg {
 384         __be32 id;
 385         struct in6_addr *src;
 386         struct in6_addr *dst;
 387 };
 388
 389 void ip6_frag_init(struct inet_frag_queue *q, void *a);
 390 int ip6_frag_match(struct inet_frag_queue *q, void *a);
 391
 392 static inline int ipv6_addr_any(const struct in6_addr *a)
 393 {
 394         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 395                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 396 }
 397
 398 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
 399 {
 400         return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
 401                  a->s6_addr32[2] == htonl(0x0000ffff));
 402 }
 403
 404 /*
 405  * find the first different bit between two addresses
 406  * length of address must be a multiple of 32bits
 407  */
 408 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 409 {
 410         const __be32 *a1 = token1, *a2 = token2;
 411         int i;
 412
 413         addrlen >>= 2;
 414
 415         for (i = 0; i < addrlen; i++) {
 416                 __be32 xb = a1[i] ^ a2[i];
 417                 if (xb)
 418                         return i * 32 + 32 - fls(ntohl(xb));
 419         }
 420
 421         /*
 422          *      we should *never* get to this point since that
 423          *      would mean the addrs are equal
 424          *
 425          *      However, we do get to it 8) And exacly, when
 426          *      addresses are equal 8)
 427          *
 428          *      ip route add 1111::/128 via ...
 429          *      ip route add 1111::/64 via ...
 430          *      and we are here.
 431          *
 432          *      Ideally, this function should stop comparison
 433          *      at prefix length. It does not, but it is still OK,
 434          *      if returned value is greater than prefix length.
 435          *                                      --ANK (980803)
 436          */
 437         return (addrlen << 5);
 438 }
 439
 440 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 441 {
 442         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 443 }
 444
 445 /*
 446  *      Prototypes exported by ipv6
 447  */
 448
 449 /*
 450  *      rcv function (called from netdevice level)
 451  */
 452
 453 extern int                      ipv6_rcv(struct sk_buff *skb,
 454                                          struct net_device *dev,
 455                                          struct packet_type *pt,
 456                                          struct net_device *orig_dev);
 457
 458 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 459
 460 /*
 461  *      upper-layer output functions
 462  */
 463 extern int                      ip6_xmit(struct sock *sk,
 464                                          struct sk_buff *skb,
 465                                          struct flowi *fl,
 466                                          struct ipv6_txoptions *opt,
 467                                          int ipfragok);
 468
 469 extern int                      ip6_nd_hdr(struct sock *sk,
 470                                            struct sk_buff *skb,
 471                                            struct net_device *dev,
 472                                            struct in6_addr *saddr,
 473                                            struct in6_addr *daddr,
 474                                            int proto, int len);
 475
 476 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 477
 478 extern int                      ip6_append_data(struct sock *sk,
 479                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 480                                                 void *from,
 481                                                 int length,
 482                                                 int transhdrlen,
 483                                                 int hlimit,
 484                                                 int tclass,
 485                                                 struct ipv6_txoptions *opt,
 486                                                 struct flowi *fl,
 487                                                 struct rt6_info *rt,
 488                                                 unsigned int flags);
 489
 490 extern int                      ip6_push_pending_frames(struct sock *sk);
 491
 492 extern void                     ip6_flush_pending_frames(struct sock *sk);
 493
 494 extern int                      ip6_dst_lookup(struct sock *sk,
 495                                                struct dst_entry **dst,
 496                                                struct flowi *fl);
 497 extern int                      ip6_dst_blackhole(struct sock *sk,
 498                                                   struct dst_entry **dst,
 499                                                   struct flowi *fl);
 500 extern int                      ip6_sk_dst_lookup(struct sock *sk,
 501                                                   struct dst_entry **dst,
 502                                                   struct flowi *fl);
 503
 504 /*
 505  *      skb processing functions
 506  */
 507
 508 extern int                      ip6_output(struct sk_buff *skb);
 509 extern int                      ip6_forward(struct sk_buff *skb);
 510 extern int                      ip6_input(struct sk_buff *skb);
 511 extern int                      ip6_mc_input(struct sk_buff *skb);
 512
 513 /*
 514  *      Extension header (options) processing
 515  */
 516
 517 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 518                                                       u8 *prev_hdr,
 519                                                       struct ipv6_txoptions *opt,
 520                                                       struct in6_addr *daddr,
 521                                                       u32 jumbolen);
 522 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 523                                                      u8 *prev_hdr,
 524                                                      struct ipv6_txoptions *opt);
 525 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 526                                                      struct ipv6_txoptions *opt,
 527                                                      u8 *proto,
 528                                                      struct in6_addr **daddr_p);
 529 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 530                                                     struct ipv6_txoptions *opt,
 531                                                     u8 *proto);
 532
 533 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 534                                                  u8 *nexthdrp);
 535
 536 extern int                      ipv6_ext_hdr(u8 nexthdr);
 537
 538 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 539
 540 /*
 541  *      socket options (ipv6_sockglue.c)
 542  */
 543
 544 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 545                                                 int optname,
 546                                                 char __user *optval,
 547                                                 int optlen);
 548 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 549                                                 int optname,
 550                                                 char __user *optval,
 551                                                 int __user *optlen);
 552 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 553                                                 int level,
 554                                                 int optname,
 555                                                 char __user *optval,
 556                                                 int optlen);
 557 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 558                                                 int level,
 559                                                 int optname,
 560                                                 char __user *optval,
 561                                                 int __user *optlen);
 562
 563 extern void                     ipv6_packet_init(void);
 564
 565 extern void                     ipv6_packet_cleanup(void);
 566
 567 extern int                      ip6_datagram_connect(struct sock *sk,
 568                                                      struct sockaddr *addr, int addr_len);
 569
 570 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 571 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 572                                                 u32 info, u8 *payload);
 573 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 574
 575 extern int inet6_release(struct socket *sock);
 576 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 577                       int addr_len);
 578 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 579                          int *uaddr_len, int peer);
 580 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 581                        unsigned long arg);
 582
 583 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 584                               struct sock *sk);
 585
 586 /*
 587  * reassembly.c
 588  */
 589 struct inet_frags_ctl;
 590 extern struct inet_frags_ctl ip6_frags_ctl;
 591
 592 extern const struct proto_ops inet6_stream_ops;
 593 extern const struct proto_ops inet6_dgram_ops;
 594
 595 struct group_source_req;
 596 struct group_filter;
 597
 598 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 599                          struct group_source_req *pgsr);
 600 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 601 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 602                          struct group_filter __user *optval,
 603                          int __user *optlen);
 604
 605 #ifdef CONFIG_PROC_FS
 606 extern int  ac6_proc_init(void);
 607 extern void ac6_proc_exit(void);
 608 extern int  raw6_proc_init(void);
 609 extern void raw6_proc_exit(void);
 610 extern int  tcp6_proc_init(void);
 611 extern void tcp6_proc_exit(void);
 612 extern int  udp6_proc_init(void);
 613 extern void udp6_proc_exit(void);
 614 extern int  udplite6_proc_init(void);
 615 extern void udplite6_proc_exit(void);
 616 extern int  ipv6_misc_proc_init(void);
 617 extern void ipv6_misc_proc_exit(void);
 618 extern int snmp6_register_dev(struct inet6_dev *idev);
 619 extern int snmp6_unregister_dev(struct inet6_dev *idev);
 620
 621 extern struct rt6_statistics rt6_stats;
 622 #else
 623 static inline int snmp6_register_dev(struct inet6_dev *idev)
 624 {
 625         return 0;
 626 }
 627
 628 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
 629 {
 630         return 0;
 631 }
 632 #endif
 633
 634 #ifdef CONFIG_SYSCTL
 635 extern ctl_table ipv6_route_table[];
 636 extern ctl_table ipv6_icmp_table[];
 637
 638 extern void ipv6_sysctl_register(void);
 639 extern void ipv6_sysctl_unregister(void);
 640 #endif
 641
 642 #endif /* __KERNEL__ */
 643 #endif /* _NET_IPV6_H */