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 /* MIBs */
 116 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 117 #define IP6_INC_STATS(idev,field)               ({                      \
 118         struct inet6_dev *_idev = (idev);                               \
 119         if (likely(_idev != NULL))                                      \
 120                 SNMP_INC_STATS(_idev->stats.ipv6, field);               \
 121         SNMP_INC_STATS(ipv6_statistics, field);                         \
 122 })
 123 #define IP6_INC_STATS_BH(idev,field)            ({                      \
 124         struct inet6_dev *_idev = (idev);                               \
 125         if (likely(_idev != NULL))                                      \
 126                 SNMP_INC_STATS_BH(_idev->stats.ipv6, field);            \
 127         SNMP_INC_STATS_BH(ipv6_statistics, field);                      \
 128 })
 129 #define IP6_INC_STATS_USER(idev,field)          ({                      \
 130         struct inet6_dev *_idev = (idev);                               \
 131         if (likely(_idev != NULL))                                      \
 132                 SNMP_INC_STATS_USER(_idev->stats.ipv6, field);          \
 133         SNMP_INC_STATS_USER(ipv6_statistics, field);                    \
 134 })
 135 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 136 #define ICMP6_INC_STATS(idev, field)            ({                      \
 137         struct inet6_dev *_idev = (idev);                               \
 138         if (likely(_idev != NULL))                                      \
 139                 SNMP_INC_STATS(idev->stats.icmpv6, field);              \
 140         SNMP_INC_STATS(icmpv6_statistics, field);                       \
 141 })
 142 #define ICMP6_INC_STATS_BH(idev, field)         ({                      \
 143         struct inet6_dev *_idev = (idev);                               \
 144         if (likely(_idev != NULL))                                      \
 145                 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field);        \
 146         SNMP_INC_STATS_BH(icmpv6_statistics, field);                    \
 147 })
 148 #define ICMP6_INC_STATS_USER(idev, field)       ({                      \
 149         struct inet6_dev *_idev = (idev);                               \
 150         if (likely(_idev != NULL))                                      \
 151                 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field);        \
 152         SNMP_INC_STATS_USER(icmpv6_statistics, field);                  \
 153 })
 154 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)  ({                      \
 155         struct inet6_dev *_idev = idev;                                         \
 156         __typeof__(offset) _offset = (offset);                                  \
 157         if (likely(_idev != NULL))                                              \
 158                 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);  \
 159         SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);            \
 160 })
 161 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 162 DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
 163 #define UDP6_INC_STATS_BH(field, is_udplite)                          do  {  \
 164         if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field);         \
 165         else            SNMP_INC_STATS_BH(udp_stats_in6, field);    } while(0)
 166 #define UDP6_INC_STATS_USER(field, is_udplite)                         do {    \
 167         if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field);         \
 168         else            SNMP_INC_STATS_USER(udp_stats_in6, field);    } while(0)
 169
 170 struct ip6_ra_chain
 171 {
 172         struct ip6_ra_chain     *next;
 173         struct sock             *sk;
 174         int                     sel;
 175         void                    (*destructor)(struct sock *);
 176 };
 177
 178 extern struct ip6_ra_chain      *ip6_ra_chain;
 179 extern rwlock_t ip6_ra_lock;
 180
 181 /*
 182    This structure is prepared by protocol, when parsing
 183    ancillary data and passed to IPv6.
 184  */
 185
 186 struct ipv6_txoptions
 187 {
 188         /* Length of this structure */
 189         int                     tot_len;
 190
 191         /* length of extension headers   */
 192
 193         __u16                   opt_flen;       /* after fragment hdr */
 194         __u16                   opt_nflen;      /* before fragment hdr */
 195
 196         struct ipv6_opt_hdr     *hopopt;
 197         struct ipv6_opt_hdr     *dst0opt;
 198         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 199         struct ipv6_opt_hdr     *dst1opt;
 200
 201         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 202 };
 203
 204 struct ip6_flowlabel
 205 {
 206         struct ip6_flowlabel    *next;
 207         __be32                  label;
 208         atomic_t                users;
 209         struct in6_addr         dst;
 210         struct ipv6_txoptions   *opt;
 211         unsigned long           linger;
 212         u8                      share;
 213         u32                     owner;
 214         unsigned long           lastuse;
 215         unsigned long           expires;
 216 };
 217
 218 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 219 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 220
 221 struct ipv6_fl_socklist
 222 {
 223         struct ipv6_fl_socklist *next;
 224         struct ip6_flowlabel    *fl;
 225 };
 226
 227 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 228 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 229                                                    struct ip6_flowlabel * fl,
 230                                                    struct ipv6_txoptions * fopt);
 231 extern void                     fl6_free_socklist(struct sock *sk);
 232 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 233 extern void                     ip6_flowlabel_init(void);
 234 extern void                     ip6_flowlabel_cleanup(void);
 235
 236 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 237 {
 238         if (fl)
 239                 atomic_dec(&fl->users);
 240 }
 241
 242 extern int                      ip6_ra_control(struct sock *sk, int sel,
 243                                                void (*destructor)(struct sock *));
 244
 245
 246 extern int                      ipv6_parse_hopopts(struct sk_buff **skbp);
 247
 248 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 249 extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 250                                                    int newtype,
 251                                                    struct ipv6_opt_hdr __user *newopt,
 252                                                    int newoptlen);
 253 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 254                                           struct ipv6_txoptions *opt);
 255
 256 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 257
 258 extern int ip6_frag_nqueues;
 259 extern atomic_t ip6_frag_mem;
 260
 261 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 262
 263 /*
 264  *      Function prototype for build_xmit
 265  */
 266
 267 typedef int             (*inet_getfrag_t) (const void *data,
 268                                            struct in6_addr *addr,
 269                                            char *,
 270                                            unsigned int, unsigned int);
 271
 272 extern int __ipv6_addr_type(const struct in6_addr *addr);
 273 static inline int ipv6_addr_type(const struct in6_addr *addr)
 274 {
 275         return __ipv6_addr_type(addr) & 0xffff;
 276 }
 277
 278 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 279 {
 280         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 281 }
 282
 283 static inline int __ipv6_addr_src_scope(int type)
 284 {
 285         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 286 }
 287
 288 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 289 {
 290         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 291 }
 292
 293 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 294 {
 295         return memcmp(a1, a2, sizeof(struct in6_addr));
 296 }
 297
 298 static inline int
 299 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 300                      const struct in6_addr *a2)
 301 {
 302         unsigned int i;
 303
 304         for (i = 0; i < 4; i++)
 305                 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
 306                         return 1;
 307         return 0;
 308 }
 309
 310 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 311 {
 312         memcpy(a1, a2, sizeof(struct in6_addr));
 313 }
 314
 315 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 316                                     const struct in6_addr *addr,
 317                                     int plen)
 318 {
 319         /* caller must guarantee 0 <= plen <= 128 */
 320         int o = plen >> 3,
 321             b = plen & 0x7;
 322
 323         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 324         memcpy(pfx->s6_addr, addr, o);
 325         if (b != 0)
 326                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 327 }
 328
 329 static inline void ipv6_addr_set(struct in6_addr *addr,
 330                                      __be32 w1, __be32 w2,
 331                                      __be32 w3, __be32 w4)
 332 {
 333         addr->s6_addr32[0] = w1;
 334         addr->s6_addr32[1] = w2;
 335         addr->s6_addr32[2] = w3;
 336         addr->s6_addr32[3] = w4;
 337 }
 338
 339 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 340                                   const struct in6_addr *a2)
 341 {
 342         return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 343                 a1->s6_addr32[1] == a2->s6_addr32[1] &&
 344                 a1->s6_addr32[2] == a2->s6_addr32[2] &&
 345                 a1->s6_addr32[3] == a2->s6_addr32[3]);
 346 }
 347
 348 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 349                                       unsigned int prefixlen)
 350 {
 351         unsigned pdw, pbi;
 352
 353         /* check complete u32 in prefix */
 354         pdw = prefixlen >> 5;
 355         if (pdw && memcmp(a1, a2, pdw << 2))
 356                 return 0;
 357
 358         /* check incomplete u32 in prefix */
 359         pbi = prefixlen & 0x1f;
 360         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 361                 return 0;
 362
 363         return 1;
 364 }
 365
 366 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 367                                     const struct in6_addr *a2,
 368                                     unsigned int prefixlen)
 369 {
 370         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 371                                    prefixlen);
 372 }
 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 /*
 381  * find the first different bit between two addresses
 382  * length of address must be a multiple of 32bits
 383  */
 384 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 385 {
 386         const __be32 *a1 = token1, *a2 = token2;
 387         int i;
 388
 389         addrlen >>= 2;
 390
 391         for (i = 0; i < addrlen; i++) {
 392                 __be32 xb = a1[i] ^ a2[i];
 393                 if (xb)
 394                         return i * 32 + 32 - fls(ntohl(xb));
 395         }
 396
 397         /*
 398          *      we should *never* get to this point since that
 399          *      would mean the addrs are equal
 400          *
 401          *      However, we do get to it 8) And exacly, when
 402          *      addresses are equal 8)
 403          *
 404          *      ip route add 1111::/128 via ...
 405          *      ip route add 1111::/64 via ...
 406          *      and we are here.
 407          *
 408          *      Ideally, this function should stop comparison
 409          *      at prefix length. It does not, but it is still OK,
 410          *      if returned value is greater than prefix length.
 411          *                                      --ANK (980803)
 412          */
 413         return (addrlen << 5);
 414 }
 415
 416 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 417 {
 418         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 419 }
 420
 421 /*
 422  *      Prototypes exported by ipv6
 423  */
 424
 425 /*
 426  *      rcv function (called from netdevice level)
 427  */
 428
 429 extern int                      ipv6_rcv(struct sk_buff *skb,
 430                                          struct net_device *dev,
 431                                          struct packet_type *pt,
 432                                          struct net_device *orig_dev);
 433
 434 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 435
 436 /*
 437  *      upper-layer output functions
 438  */
 439 extern int                      ip6_xmit(struct sock *sk,
 440                                          struct sk_buff *skb,
 441                                          struct flowi *fl,
 442                                          struct ipv6_txoptions *opt,
 443                                          int ipfragok);
 444
 445 extern int                      ip6_nd_hdr(struct sock *sk,
 446                                            struct sk_buff *skb,
 447                                            struct net_device *dev,
 448                                            struct in6_addr *saddr,
 449                                            struct in6_addr *daddr,
 450                                            int proto, int len);
 451
 452 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 453
 454 extern int                      ip6_append_data(struct sock *sk,
 455                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 456                                                 void *from,
 457                                                 int length,
 458                                                 int transhdrlen,
 459                                                 int hlimit,
 460                                                 int tclass,
 461                                                 struct ipv6_txoptions *opt,
 462                                                 struct flowi *fl,
 463                                                 struct rt6_info *rt,
 464                                                 unsigned int flags);
 465
 466 extern int                      ip6_push_pending_frames(struct sock *sk);
 467
 468 extern void                     ip6_flush_pending_frames(struct sock *sk);
 469
 470 extern int                      ip6_dst_lookup(struct sock *sk,
 471                                                struct dst_entry **dst,
 472                                                struct flowi *fl);
 473 extern int                      ip6_dst_blackhole(struct sock *sk,
 474                                                   struct dst_entry **dst,
 475                                                   struct flowi *fl);
 476 extern int                      ip6_sk_dst_lookup(struct sock *sk,
 477                                                   struct dst_entry **dst,
 478                                                   struct flowi *fl);
 479
 480 /*
 481  *      skb processing functions
 482  */
 483
 484 extern int                      ip6_output(struct sk_buff *skb);
 485 extern int                      ip6_forward(struct sk_buff *skb);
 486 extern int                      ip6_input(struct sk_buff *skb);
 487 extern int                      ip6_mc_input(struct sk_buff *skb);
 488
 489 /*
 490  *      Extension header (options) processing
 491  */
 492
 493 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 494                                                       u8 *prev_hdr,
 495                                                       struct ipv6_txoptions *opt,
 496                                                       struct in6_addr *daddr,
 497                                                       u32 jumbolen);
 498 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 499                                                      u8 *prev_hdr,
 500                                                      struct ipv6_txoptions *opt);
 501 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 502                                                      struct ipv6_txoptions *opt,
 503                                                      u8 *proto,
 504                                                      struct in6_addr **daddr_p);
 505 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 506                                                     struct ipv6_txoptions *opt,
 507                                                     u8 *proto);
 508
 509 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 510                                                  u8 *nexthdrp);
 511
 512 extern int                      ipv6_ext_hdr(u8 nexthdr);
 513
 514 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 515
 516 /*
 517  *      socket options (ipv6_sockglue.c)
 518  */
 519
 520 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 521                                                 int optname,
 522                                                 char __user *optval,
 523                                                 int optlen);
 524 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 525                                                 int optname,
 526                                                 char __user *optval,
 527                                                 int __user *optlen);
 528 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 529                                                 int level,
 530                                                 int optname,
 531                                                 char __user *optval,
 532                                                 int optlen);
 533 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 534                                                 int level,
 535                                                 int optname,
 536                                                 char __user *optval,
 537                                                 int __user *optlen);
 538
 539 extern void                     ipv6_packet_init(void);
 540
 541 extern void                     ipv6_packet_cleanup(void);
 542
 543 extern int                      ip6_datagram_connect(struct sock *sk,
 544                                                      struct sockaddr *addr, int addr_len);
 545
 546 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 547 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 548                                                 u32 info, u8 *payload);
 549 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 550
 551 extern int inet6_release(struct socket *sock);
 552 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 553                       int addr_len);
 554 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 555                          int *uaddr_len, int peer);
 556 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 557                        unsigned long arg);
 558
 559 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 560                               struct sock *sk);
 561
 562 /*
 563  * reassembly.c
 564  */
 565 extern int sysctl_ip6frag_high_thresh;
 566 extern int sysctl_ip6frag_low_thresh;
 567 extern int sysctl_ip6frag_time;
 568 extern int sysctl_ip6frag_secret_interval;
 569
 570 extern const struct proto_ops inet6_stream_ops;
 571 extern const struct proto_ops inet6_dgram_ops;
 572
 573 struct group_source_req;
 574 struct group_filter;
 575
 576 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 577                          struct group_source_req *pgsr);
 578 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 579 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 580                          struct group_filter __user *optval,
 581                          int __user *optlen);
 582
 583 #ifdef CONFIG_PROC_FS
 584 extern int  ac6_proc_init(void);
 585 extern void ac6_proc_exit(void);
 586 extern int  raw6_proc_init(void);
 587 extern void raw6_proc_exit(void);
 588 extern int  tcp6_proc_init(void);
 589 extern void tcp6_proc_exit(void);
 590 extern int  udp6_proc_init(void);
 591 extern void udp6_proc_exit(void);
 592 extern int  udplite6_proc_init(void);
 593 extern void udplite6_proc_exit(void);
 594 extern int  ipv6_misc_proc_init(void);
 595 extern void ipv6_misc_proc_exit(void);
 596 extern int snmp6_register_dev(struct inet6_dev *idev);
 597 extern int snmp6_unregister_dev(struct inet6_dev *idev);
 598
 599 extern struct rt6_statistics rt6_stats;
 600 #else
 601 static inline int snmp6_register_dev(struct inet6_dev *idev)
 602 {
 603         return 0;
 604 }
 605
 606 static inline int snmp6_unregister_dev(struct inet6_dev *idev)
 607 {
 608         return 0;
 609 }
 610 #endif
 611
 612 #ifdef CONFIG_SYSCTL
 613 extern ctl_table ipv6_route_table[];
 614 extern ctl_table ipv6_icmp_table[];
 615
 616 extern void ipv6_sysctl_register(void);
 617 extern void ipv6_sysctl_unregister(void);
 618 #endif
 619
 620 #endif /* __KERNEL__ */
 621 #endif /* _NET_IPV6_H */