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_mld_max_msf;
 113
 114 extern struct ctl_path net_ipv6_ctl_path[];
 115
 116 #define _DEVINC(statname, modifier, idev, field)                        \
 117 ({                                                                      \
 118         struct inet6_dev *_idev = (idev);                               \
 119         if (likely(_idev != NULL))                                      \
 120                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 121         SNMP_INC_STATS##modifier(statname##_statistics, (field));       \
 122 })
 123
 124 #define _DEVADD(statname, modifier, idev, field, val)                   \
 125 ({                                                                      \
 126         struct inet6_dev *_idev = (idev);                               \
 127         if (likely(_idev != NULL))                                      \
 128                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 129         SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
 130 })
 131
 132 /* MIBs */
 133 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 134
 135 #define IP6_INC_STATS(idev,field)       _DEVINC(ipv6, , idev, field)
 136 #define IP6_INC_STATS_BH(idev,field)    _DEVINC(ipv6, _BH, idev, field)
 137 #define IP6_INC_STATS_USER(idev,field)  _DEVINC(ipv6, _USER, idev, field)
 138 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
 139
 140 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 141 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
 142
 143 #define ICMP6_INC_STATS(idev, field)    _DEVINC(icmpv6, , idev, field)
 144 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
 145 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
 146
 147 #define ICMP6MSGOUT_INC_STATS(idev, field) \
 148         _DEVINC(icmpv6msg, , idev, field +256)
 149 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
 150         _DEVINC(icmpv6msg, _BH, idev, field +256)
 151 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
 152         _DEVINC(icmpv6msg, _USER, idev, field +256)
 153 #define ICMP6MSGIN_INC_STATS(idev, field) \
 154          _DEVINC(icmpv6msg, , idev, field)
 155 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
 156         _DEVINC(icmpv6msg, _BH, idev, field)
 157 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
 158         _DEVINC(icmpv6msg, _USER, idev, field)
 159
 160 struct ip6_ra_chain
 161 {
 162         struct ip6_ra_chain     *next;
 163         struct sock             *sk;
 164         int                     sel;
 165         void                    (*destructor)(struct sock *);
 166 };
 167
 168 extern struct ip6_ra_chain      *ip6_ra_chain;
 169 extern rwlock_t ip6_ra_lock;
 170
 171 /*
 172    This structure is prepared by protocol, when parsing
 173    ancillary data and passed to IPv6.
 174  */
 175
 176 struct ipv6_txoptions
 177 {
 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 {
 196         struct ip6_flowlabel    *next;
 197         __be32                  label;
 198         atomic_t                users;
 199         struct in6_addr         dst;
 200         struct ipv6_txoptions   *opt;
 201         unsigned long           linger;
 202         u8                      share;
 203         u32                     owner;
 204         unsigned long           lastuse;
 205         unsigned long           expires;
 206 };
 207
 208 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 209 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 210
 211 struct ipv6_fl_socklist
 212 {
 213         struct ipv6_fl_socklist *next;
 214         struct ip6_flowlabel    *fl;
 215 };
 216
 217 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 218 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 219                                                    struct ip6_flowlabel * fl,
 220                                                    struct ipv6_txoptions * fopt);
 221 extern void                     fl6_free_socklist(struct sock *sk);
 222 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 223 extern int                      ip6_flowlabel_init(void);
 224 extern void                     ip6_flowlabel_cleanup(void);
 225
 226 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 227 {
 228         if (fl)
 229                 atomic_dec(&fl->users);
 230 }
 231
 232 extern int                      ip6_ra_control(struct sock *sk, int sel,
 233                                                void (*destructor)(struct sock *));
 234
 235
 236 extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 237
 238 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 239 extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 240                                                    int newtype,
 241                                                    struct ipv6_opt_hdr __user *newopt,
 242                                                    int newoptlen);
 243 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 244                                           struct ipv6_txoptions *opt);
 245
 246 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 247
 248 int ip6_frag_nqueues(struct net *net);
 249 int ip6_frag_mem(void);
 250
 251 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 252
 253 /*
 254  *      Function prototype for build_xmit
 255  */
 256
 257 typedef int             (*inet_getfrag_t) (const void *data,
 258                                            struct in6_addr *addr,
 259                                            char *,
 260                                            unsigned int, unsigned int);
 261
 262 extern int __ipv6_addr_type(const struct in6_addr *addr);
 263 static inline int ipv6_addr_type(const struct in6_addr *addr)
 264 {
 265         return __ipv6_addr_type(addr) & 0xffff;
 266 }
 267
 268 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 269 {
 270         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 271 }
 272
 273 static inline int __ipv6_addr_src_scope(int type)
 274 {
 275         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 276 }
 277
 278 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 279 {
 280         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 281 }
 282
 283 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 284 {
 285         return memcmp(a1, a2, sizeof(struct in6_addr));
 286 }
 287
 288 static inline int
 289 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 290                      const struct in6_addr *a2)
 291 {
 292         unsigned int i;
 293
 294         for (i = 0; i < 4; i++)
 295                 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
 296                         return 1;
 297         return 0;
 298 }
 299
 300 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 301 {
 302         memcpy(a1, a2, sizeof(struct in6_addr));
 303 }
 304
 305 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 306                                     const struct in6_addr *addr,
 307                                     int plen)
 308 {
 309         /* caller must guarantee 0 <= plen <= 128 */
 310         int o = plen >> 3,
 311             b = plen & 0x7;
 312
 313         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 314         memcpy(pfx->s6_addr, addr, o);
 315         if (b != 0)
 316                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 317 }
 318
 319 static inline void ipv6_addr_set(struct in6_addr *addr,
 320                                      __be32 w1, __be32 w2,
 321                                      __be32 w3, __be32 w4)
 322 {
 323         addr->s6_addr32[0] = w1;
 324         addr->s6_addr32[1] = w2;
 325         addr->s6_addr32[2] = w3;
 326         addr->s6_addr32[3] = w4;
 327 }
 328
 329 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 330                                   const struct in6_addr *a2)
 331 {
 332         return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 333                 a1->s6_addr32[1] == a2->s6_addr32[1] &&
 334                 a1->s6_addr32[2] == a2->s6_addr32[2] &&
 335                 a1->s6_addr32[3] == a2->s6_addr32[3]);
 336 }
 337
 338 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 339                                       unsigned int prefixlen)
 340 {
 341         unsigned pdw, pbi;
 342
 343         /* check complete u32 in prefix */
 344         pdw = prefixlen >> 5;
 345         if (pdw && memcmp(a1, a2, pdw << 2))
 346                 return 0;
 347
 348         /* check incomplete u32 in prefix */
 349         pbi = prefixlen & 0x1f;
 350         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 351                 return 0;
 352
 353         return 1;
 354 }
 355
 356 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 357                                     const struct in6_addr *a2,
 358                                     unsigned int prefixlen)
 359 {
 360         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 361                                    prefixlen);
 362 }
 363
 364 struct inet_frag_queue;
 365
 366 struct ip6_create_arg {
 367         __be32 id;
 368         struct in6_addr *src;
 369         struct in6_addr *dst;
 370 };
 371
 372 void ip6_frag_init(struct inet_frag_queue *q, void *a);
 373 int ip6_frag_match(struct inet_frag_queue *q, void *a);
 374
 375 static inline int ipv6_addr_any(const struct in6_addr *a)
 376 {
 377         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 378                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 379 }
 380
 381 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
 382 {
 383         return ((a->s6_addr32[0] | a->s6_addr32[1]) == 0 &&
 384                  a->s6_addr32[2] == htonl(0x0000ffff));
 385 }
 386
 387 /*
 388  * find the first different bit between two addresses
 389  * length of address must be a multiple of 32bits
 390  */
 391 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 392 {
 393         const __be32 *a1 = token1, *a2 = token2;
 394         int i;
 395
 396         addrlen >>= 2;
 397
 398         for (i = 0; i < addrlen; i++) {
 399                 __be32 xb = a1[i] ^ a2[i];
 400                 if (xb)
 401                         return i * 32 + 32 - fls(ntohl(xb));
 402         }
 403
 404         /*
 405          *      we should *never* get to this point since that
 406          *      would mean the addrs are equal
 407          *
 408          *      However, we do get to it 8) And exacly, when
 409          *      addresses are equal 8)
 410          *
 411          *      ip route add 1111::/128 via ...
 412          *      ip route add 1111::/64 via ...
 413          *      and we are here.
 414          *
 415          *      Ideally, this function should stop comparison
 416          *      at prefix length. It does not, but it is still OK,
 417          *      if returned value is greater than prefix length.
 418          *                                      --ANK (980803)
 419          */
 420         return (addrlen << 5);
 421 }
 422
 423 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 424 {
 425         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 426 }
 427
 428 /*
 429  *      Prototypes exported by ipv6
 430  */
 431
 432 /*
 433  *      rcv function (called from netdevice level)
 434  */
 435
 436 extern int                      ipv6_rcv(struct sk_buff *skb,
 437                                          struct net_device *dev,
 438                                          struct packet_type *pt,
 439                                          struct net_device *orig_dev);
 440
 441 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 442
 443 /*
 444  *      upper-layer output functions
 445  */
 446 extern int                      ip6_xmit(struct sock *sk,
 447                                          struct sk_buff *skb,
 448                                          struct flowi *fl,
 449                                          struct ipv6_txoptions *opt,
 450                                          int ipfragok);
 451
 452 extern int                      ip6_nd_hdr(struct sock *sk,
 453                                            struct sk_buff *skb,
 454                                            struct net_device *dev,
 455                                            struct in6_addr *saddr,
 456                                            struct in6_addr *daddr,
 457                                            int proto, int len);
 458
 459 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 460
 461 extern int                      ip6_append_data(struct sock *sk,
 462                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 463                                                 void *from,
 464                                                 int length,
 465                                                 int transhdrlen,
 466                                                 int hlimit,
 467                                                 int tclass,
 468                                                 struct ipv6_txoptions *opt,
 469                                                 struct flowi *fl,
 470                                                 struct rt6_info *rt,
 471                                                 unsigned int flags);
 472
 473 extern int                      ip6_push_pending_frames(struct sock *sk);
 474
 475 extern void                     ip6_flush_pending_frames(struct sock *sk);
 476
 477 extern int                      ip6_dst_lookup(struct sock *sk,
 478                                                struct dst_entry **dst,
 479                                                struct flowi *fl);
 480 extern int                      ip6_dst_blackhole(struct sock *sk,
 481                                                   struct dst_entry **dst,
 482                                                   struct flowi *fl);
 483 extern int                      ip6_sk_dst_lookup(struct sock *sk,
 484                                                   struct dst_entry **dst,
 485                                                   struct flowi *fl);
 486
 487 /*
 488  *      skb processing functions
 489  */
 490
 491 extern int                      ip6_output(struct sk_buff *skb);
 492 extern int                      ip6_forward(struct sk_buff *skb);
 493 extern int                      ip6_input(struct sk_buff *skb);
 494 extern int                      ip6_mc_input(struct sk_buff *skb);
 495
 496 extern int                      __ip6_local_out(struct sk_buff *skb);
 497 extern int                      ip6_local_out(struct sk_buff *skb);
 498
 499 /*
 500  *      Extension header (options) processing
 501  */
 502
 503 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 504                                                       u8 *prev_hdr,
 505                                                       struct ipv6_txoptions *opt,
 506                                                       struct in6_addr *daddr,
 507                                                       u32 jumbolen);
 508 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 509                                                      u8 *prev_hdr,
 510                                                      struct ipv6_txoptions *opt);
 511 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 512                                                      struct ipv6_txoptions *opt,
 513                                                      u8 *proto,
 514                                                      struct in6_addr **daddr_p);
 515 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 516                                                     struct ipv6_txoptions *opt,
 517                                                     u8 *proto);
 518
 519 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 520                                                  u8 *nexthdrp);
 521
 522 extern int                      ipv6_ext_hdr(u8 nexthdr);
 523
 524 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 525
 526 /*
 527  *      socket options (ipv6_sockglue.c)
 528  */
 529
 530 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 531                                                 int optname,
 532                                                 char __user *optval,
 533                                                 int optlen);
 534 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 535                                                 int optname,
 536                                                 char __user *optval,
 537                                                 int __user *optlen);
 538 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 539                                                 int level,
 540                                                 int optname,
 541                                                 char __user *optval,
 542                                                 int optlen);
 543 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 544                                                 int level,
 545                                                 int optname,
 546                                                 char __user *optval,
 547                                                 int __user *optlen);
 548
 549 extern int                      ipv6_packet_init(void);
 550
 551 extern void                     ipv6_packet_cleanup(void);
 552
 553 extern int                      ip6_datagram_connect(struct sock *sk,
 554                                                      struct sockaddr *addr, int addr_len);
 555
 556 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 557 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 558                                                 u32 info, u8 *payload);
 559 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 560
 561 extern int inet6_release(struct socket *sock);
 562 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 563                       int addr_len);
 564 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 565                          int *uaddr_len, int peer);
 566 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 567                        unsigned long arg);
 568
 569 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 570                               struct sock *sk);
 571
 572 /*
 573  * reassembly.c
 574  */
 575 extern const struct proto_ops inet6_stream_ops;
 576 extern const struct proto_ops inet6_dgram_ops;
 577
 578 struct group_source_req;
 579 struct group_filter;
 580
 581 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 582                          struct group_source_req *pgsr);
 583 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 584 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 585                          struct group_filter __user *optval,
 586                          int __user *optlen);
 587
 588 #ifdef CONFIG_PROC_FS
 589 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
 590 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
 591
 592 extern int  ac6_proc_init(void);
 593 extern void ac6_proc_exit(void);
 594 extern int  raw6_proc_init(void);
 595 extern void raw6_proc_exit(void);
 596 extern int  tcp6_proc_init(void);
 597 extern void tcp6_proc_exit(void);
 598 extern int  udp6_proc_init(void);
 599 extern void udp6_proc_exit(void);
 600 extern int  udplite6_proc_init(void);
 601 extern void udplite6_proc_exit(void);
 602 extern int  ipv6_misc_proc_init(void);
 603 extern void ipv6_misc_proc_exit(void);
 604 extern int snmp6_register_dev(struct inet6_dev *idev);
 605 extern int snmp6_unregister_dev(struct inet6_dev *idev);
 606
 607 extern struct rt6_statistics rt6_stats;
 608 #else
 609 static inline int snmp6_register_dev(struct inet6_dev *idev)
 610 {
 611         return 0;
 612 }
 613
 614 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
 615 {
 616         return 0;
 617 }
 618 #endif
 619
 620 #ifdef CONFIG_SYSCTL
 621 extern ctl_table ipv6_route_table_template[];
 622 extern ctl_table ipv6_icmp_table_template[];
 623
 624 extern int ipv6_sysctl_register(void);
 625 extern void ipv6_sysctl_unregister(void);
 626 #endif
 627
 628 #endif /* __KERNEL__ */
 629 #endif /* _NET_IPV6_H */