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 extern struct ctl_path net_ipv6_ctl_path[];
 116
 117 #define _DEVINC(statname, modifier, idev, field)                        \
 118 ({                                                                      \
 119         struct inet6_dev *_idev = (idev);                               \
 120         if (likely(_idev != NULL))                                      \
 121                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 122         SNMP_INC_STATS##modifier(statname##_statistics, (field));       \
 123 })
 124
 125 #define _DEVADD(statname, modifier, idev, field, val)                   \
 126 ({                                                                      \
 127         struct inet6_dev *_idev = (idev);                               \
 128         if (likely(_idev != NULL))                                      \
 129                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 130         SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
 131 })
 132
 133 /* MIBs */
 134 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 135
 136 #define IP6_INC_STATS(idev,field)       _DEVINC(ipv6, , idev, field)
 137 #define IP6_INC_STATS_BH(idev,field)    _DEVINC(ipv6, _BH, idev, field)
 138 #define IP6_INC_STATS_USER(idev,field)  _DEVINC(ipv6, _USER, idev, field)
 139 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
 140
 141 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 142 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
 143
 144 #define ICMP6_INC_STATS(idev, field)    _DEVINC(icmpv6, , idev, field)
 145 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
 146 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
 147
 148 #define ICMP6MSGOUT_INC_STATS(idev, field) \
 149         _DEVINC(icmpv6msg, , idev, field +256)
 150 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
 151         _DEVINC(icmpv6msg, _BH, idev, field +256)
 152 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
 153         _DEVINC(icmpv6msg, _USER, idev, field +256)
 154 #define ICMP6MSGIN_INC_STATS(idev, field) \
 155          _DEVINC(icmpv6msg, , idev, field)
 156 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
 157         _DEVINC(icmpv6msg, _BH, idev, field)
 158 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
 159         _DEVINC(icmpv6msg, _USER, idev, field)
 160
 161 struct ip6_ra_chain
 162 {
 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 {
 179         /* Length of this structure */
 180         int                     tot_len;
 181
 182         /* length of extension headers   */
 183
 184         __u16                   opt_flen;       /* after fragment hdr */
 185         __u16                   opt_nflen;      /* before fragment hdr */
 186
 187         struct ipv6_opt_hdr     *hopopt;
 188         struct ipv6_opt_hdr     *dst0opt;
 189         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 190         struct ipv6_opt_hdr     *dst1opt;
 191
 192         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 193 };
 194
 195 struct ip6_flowlabel
 196 {
 197         struct ip6_flowlabel    *next;
 198         __be32                  label;
 199         atomic_t                users;
 200         struct in6_addr         dst;
 201         struct ipv6_txoptions   *opt;
 202         unsigned long           linger;
 203         u8                      share;
 204         u32                     owner;
 205         unsigned long           lastuse;
 206         unsigned long           expires;
 207 };
 208
 209 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 210 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 211
 212 struct ipv6_fl_socklist
 213 {
 214         struct ipv6_fl_socklist *next;
 215         struct ip6_flowlabel    *fl;
 216 };
 217
 218 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 219 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 220                                                    struct ip6_flowlabel * fl,
 221                                                    struct ipv6_txoptions * fopt);
 222 extern void                     fl6_free_socklist(struct sock *sk);
 223 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 224 extern int                      ip6_flowlabel_init(void);
 225 extern void                     ip6_flowlabel_cleanup(void);
 226
 227 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 228 {
 229         if (fl)
 230                 atomic_dec(&fl->users);
 231 }
 232
 233 extern int                      ip6_ra_control(struct sock *sk, int sel,
 234                                                void (*destructor)(struct sock *));
 235
 236
 237 extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 238
 239 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 240 extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 241                                                    int newtype,
 242                                                    struct ipv6_opt_hdr __user *newopt,
 243                                                    int newoptlen);
 244 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 245                                           struct ipv6_txoptions *opt);
 246
 247 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 248
 249 int ip6_frag_nqueues(void);
 250 int ip6_frag_mem(void);
 251
 252 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 253
 254 /*
 255  *      Function prototype for build_xmit
 256  */
 257
 258 typedef int             (*inet_getfrag_t) (const void *data,
 259                                            struct in6_addr *addr,
 260                                            char *,
 261                                            unsigned int, unsigned int);
 262
 263 extern int __ipv6_addr_type(const struct in6_addr *addr);
 264 static inline int ipv6_addr_type(const struct in6_addr *addr)
 265 {
 266         return __ipv6_addr_type(addr) & 0xffff;
 267 }
 268
 269 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 270 {
 271         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 272 }
 273
 274 static inline int __ipv6_addr_src_scope(int type)
 275 {
 276         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 277 }
 278
 279 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 280 {
 281         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 282 }
 283
 284 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 285 {
 286         return memcmp(a1, a2, sizeof(struct in6_addr));
 287 }
 288
 289 static inline int
 290 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 291                      const struct in6_addr *a2)
 292 {
 293         unsigned int i;
 294
 295         for (i = 0; i < 4; i++)
 296                 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
 297                         return 1;
 298         return 0;
 299 }
 300
 301 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 302 {
 303         memcpy(a1, a2, sizeof(struct in6_addr));
 304 }
 305
 306 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 307                                     const struct in6_addr *addr,
 308                                     int plen)
 309 {
 310         /* caller must guarantee 0 <= plen <= 128 */
 311         int o = plen >> 3,
 312             b = plen & 0x7;
 313
 314         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 315         memcpy(pfx->s6_addr, addr, o);
 316         if (b != 0)
 317                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 318 }
 319
 320 static inline void ipv6_addr_set(struct in6_addr *addr,
 321                                      __be32 w1, __be32 w2,
 322                                      __be32 w3, __be32 w4)
 323 {
 324         addr->s6_addr32[0] = w1;
 325         addr->s6_addr32[1] = w2;
 326         addr->s6_addr32[2] = w3;
 327         addr->s6_addr32[3] = w4;
 328 }
 329
 330 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 331                                   const struct in6_addr *a2)
 332 {
 333         return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 334                 a1->s6_addr32[1] == a2->s6_addr32[1] &&
 335                 a1->s6_addr32[2] == a2->s6_addr32[2] &&
 336                 a1->s6_addr32[3] == a2->s6_addr32[3]);
 337 }
 338
 339 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 340                                       unsigned int prefixlen)
 341 {
 342         unsigned pdw, pbi;
 343
 344         /* check complete u32 in prefix */
 345         pdw = prefixlen >> 5;
 346         if (pdw && memcmp(a1, a2, pdw << 2))
 347                 return 0;
 348
 349         /* check incomplete u32 in prefix */
 350         pbi = prefixlen & 0x1f;
 351         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 352                 return 0;
 353
 354         return 1;
 355 }
 356
 357 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 358                                     const struct in6_addr *a2,
 359                                     unsigned int prefixlen)
 360 {
 361         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 362                                    prefixlen);
 363 }
 364
 365 struct inet_frag_queue;
 366
 367 struct ip6_create_arg {
 368         __be32 id;
 369         struct in6_addr *src;
 370         struct in6_addr *dst;
 371 };
 372
 373 void ip6_frag_init(struct inet_frag_queue *q, void *a);
 374 int ip6_frag_match(struct inet_frag_queue *q, void *a);
 375
 376 static inline int ipv6_addr_any(const struct in6_addr *a)
 377 {
 378         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 379                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 380 }
 381
 382 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
 383 {
 384         return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
 385                  a->s6_addr32[2] == htonl(0x0000ffff));
 386 }
 387
 388 /*
 389  * find the first different bit between two addresses
 390  * length of address must be a multiple of 32bits
 391  */
 392 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 393 {
 394         const __be32 *a1 = token1, *a2 = token2;
 395         int i;
 396
 397         addrlen >>= 2;
 398
 399         for (i = 0; i < addrlen; i++) {
 400                 __be32 xb = a1[i] ^ a2[i];
 401                 if (xb)
 402                         return i * 32 + 32 - fls(ntohl(xb));
 403         }
 404
 405         /*
 406          *      we should *never* get to this point since that
 407          *      would mean the addrs are equal
 408          *
 409          *      However, we do get to it 8) And exacly, when
 410          *      addresses are equal 8)
 411          *
 412          *      ip route add 1111::/128 via ...
 413          *      ip route add 1111::/64 via ...
 414          *      and we are here.
 415          *
 416          *      Ideally, this function should stop comparison
 417          *      at prefix length. It does not, but it is still OK,
 418          *      if returned value is greater than prefix length.
 419          *                                      --ANK (980803)
 420          */
 421         return (addrlen << 5);
 422 }
 423
 424 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 425 {
 426         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 427 }
 428
 429 /*
 430  *      Prototypes exported by ipv6
 431  */
 432
 433 /*
 434  *      rcv function (called from netdevice level)
 435  */
 436
 437 extern int                      ipv6_rcv(struct sk_buff *skb,
 438                                          struct net_device *dev,
 439                                          struct packet_type *pt,
 440                                          struct net_device *orig_dev);
 441
 442 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 443
 444 /*
 445  *      upper-layer output functions
 446  */
 447 extern int                      ip6_xmit(struct sock *sk,
 448                                          struct sk_buff *skb,
 449                                          struct flowi *fl,
 450                                          struct ipv6_txoptions *opt,
 451                                          int ipfragok);
 452
 453 extern int                      ip6_nd_hdr(struct sock *sk,
 454                                            struct sk_buff *skb,
 455                                            struct net_device *dev,
 456                                            struct in6_addr *saddr,
 457                                            struct in6_addr *daddr,
 458                                            int proto, int len);
 459
 460 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 461
 462 extern int                      ip6_append_data(struct sock *sk,
 463                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 464                                                 void *from,
 465                                                 int length,
 466                                                 int transhdrlen,
 467                                                 int hlimit,
 468                                                 int tclass,
 469                                                 struct ipv6_txoptions *opt,
 470                                                 struct flowi *fl,
 471                                                 struct rt6_info *rt,
 472                                                 unsigned int flags);
 473
 474 extern int                      ip6_push_pending_frames(struct sock *sk);
 475
 476 extern void                     ip6_flush_pending_frames(struct sock *sk);
 477
 478 extern int                      ip6_dst_lookup(struct sock *sk,
 479                                                struct dst_entry **dst,
 480                                                struct flowi *fl);
 481 extern int                      ip6_dst_blackhole(struct sock *sk,
 482                                                   struct dst_entry **dst,
 483                                                   struct flowi *fl);
 484 extern int                      ip6_sk_dst_lookup(struct sock *sk,
 485                                                   struct dst_entry **dst,
 486                                                   struct flowi *fl);
 487
 488 /*
 489  *      skb processing functions
 490  */
 491
 492 extern int                      ip6_output(struct sk_buff *skb);
 493 extern int                      ip6_forward(struct sk_buff *skb);
 494 extern int                      ip6_input(struct sk_buff *skb);
 495 extern int                      ip6_mc_input(struct sk_buff *skb);
 496
 497 extern int                      __ip6_local_out(struct sk_buff *skb);
 498 extern int                      ip6_local_out(struct sk_buff *skb);
 499
 500 /*
 501  *      Extension header (options) processing
 502  */
 503
 504 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 505                                                       u8 *prev_hdr,
 506                                                       struct ipv6_txoptions *opt,
 507                                                       struct in6_addr *daddr,
 508                                                       u32 jumbolen);
 509 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 510                                                      u8 *prev_hdr,
 511                                                      struct ipv6_txoptions *opt);
 512 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 513                                                      struct ipv6_txoptions *opt,
 514                                                      u8 *proto,
 515                                                      struct in6_addr **daddr_p);
 516 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 517                                                     struct ipv6_txoptions *opt,
 518                                                     u8 *proto);
 519
 520 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 521                                                  u8 *nexthdrp);
 522
 523 extern int                      ipv6_ext_hdr(u8 nexthdr);
 524
 525 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 526
 527 /*
 528  *      socket options (ipv6_sockglue.c)
 529  */
 530
 531 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 532                                                 int optname,
 533                                                 char __user *optval,
 534                                                 int optlen);
 535 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 536                                                 int optname,
 537                                                 char __user *optval,
 538                                                 int __user *optlen);
 539 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 540                                                 int level,
 541                                                 int optname,
 542                                                 char __user *optval,
 543                                                 int optlen);
 544 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 545                                                 int level,
 546                                                 int optname,
 547                                                 char __user *optval,
 548                                                 int __user *optlen);
 549
 550 extern int                      ipv6_packet_init(void);
 551
 552 extern void                     ipv6_packet_cleanup(void);
 553
 554 extern int                      ip6_datagram_connect(struct sock *sk,
 555                                                      struct sockaddr *addr, int addr_len);
 556
 557 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 558 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 559                                                 u32 info, u8 *payload);
 560 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 561
 562 extern int inet6_release(struct socket *sock);
 563 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 564                       int addr_len);
 565 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 566                          int *uaddr_len, int peer);
 567 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 568                        unsigned long arg);
 569
 570 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 571                               struct sock *sk);
 572
 573 /*
 574  * reassembly.c
 575  */
 576 struct inet_frags_ctl;
 577 extern struct inet_frags_ctl ip6_frags_ctl;
 578
 579 extern const struct proto_ops inet6_stream_ops;
 580 extern const struct proto_ops inet6_dgram_ops;
 581
 582 struct group_source_req;
 583 struct group_filter;
 584
 585 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 586                          struct group_source_req *pgsr);
 587 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 588 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 589                          struct group_filter __user *optval,
 590                          int __user *optlen);
 591
 592 #ifdef CONFIG_PROC_FS
 593 extern int  ac6_proc_init(void);
 594 extern void ac6_proc_exit(void);
 595 extern int  raw6_proc_init(void);
 596 extern void raw6_proc_exit(void);
 597 extern int  tcp6_proc_init(void);
 598 extern void tcp6_proc_exit(void);
 599 extern int  udp6_proc_init(void);
 600 extern void udp6_proc_exit(void);
 601 extern int  udplite6_proc_init(void);
 602 extern void udplite6_proc_exit(void);
 603 extern int  ipv6_misc_proc_init(void);
 604 extern void ipv6_misc_proc_exit(void);
 605 extern int snmp6_register_dev(struct inet6_dev *idev);
 606 extern int snmp6_unregister_dev(struct inet6_dev *idev);
 607
 608 extern struct rt6_statistics rt6_stats;
 609 #else
 610 static inline int snmp6_register_dev(struct inet6_dev *idev)
 611 {
 612         return 0;
 613 }
 614
 615 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
 616 {
 617         return 0;
 618 }
 619 #endif
 620
 621 #ifdef CONFIG_SYSCTL
 622 extern ctl_table ipv6_route_table[];
 623 extern ctl_table ipv6_icmp_table[];
 624
 625 extern void ipv6_sysctl_register(void);
 626 extern void ipv6_sysctl_unregister(void);
 627 #endif
 628
 629 #endif /* __KERNEL__ */
 630 #endif /* _NET_IPV6_H */