include/net/ipv6.h

   1 /*
   2  *      Linux INET6 implementation
   3  *
   4  *      Authors:
   5  *      Pedro Roque             <roque@di.fc.ul.pt>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _NET_IPV6_H
  14 #define _NET_IPV6_H
  15
  16 #include <linux/ipv6.h>
  17 #include <linux/hardirq.h>
  18 #include <net/if_inet6.h>
  19 #include <net/ndisc.h>
  20 #include <net/flow.h>
  21 #include <net/snmp.h>
  22
  23 #define SIN6_LEN_RFC2133        24
  24
  25 #define IPV6_MAXPLEN            65535
  26
  27 /*
  28  *      NextHeader field of IPv6 header
  29  */
  30
  31 #define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
  32 #define NEXTHDR_TCP             6       /* TCP segment. */
  33 #define NEXTHDR_UDP             17      /* UDP message. */
  34 #define NEXTHDR_IPV6            41      /* IPv6 in IPv6 */
  35 #define NEXTHDR_ROUTING         43      /* Routing header. */
  36 #define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly header. */
  37 #define NEXTHDR_ESP             50      /* Encapsulating security payload. */
  38 #define NEXTHDR_AUTH            51      /* Authentication header. */
  39 #define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
  40 #define NEXTHDR_NONE            59      /* No next header */
  41 #define NEXTHDR_DEST            60      /* Destination options header. */
  42 #define NEXTHDR_MOBILITY        135     /* Mobility header. */
  43
  44 #define NEXTHDR_MAX             255
  45
  46
  47
  48 #define IPV6_DEFAULT_HOPLIMIT   64
  49 #define IPV6_DEFAULT_MCASTHOPS  1
  50
  51 /*
  52  *      Addr type
  53  *
  54  *      type    -       unicast | multicast
  55  *      scope   -       local   | site      | global
  56  *      v4      -       compat
  57  *      v4mapped
  58  *      any
  59  *      loopback
  60  */
  61
  62 #define IPV6_ADDR_ANY           0x0000U
  63
  64 #define IPV6_ADDR_UNICAST       0x0001U
  65 #define IPV6_ADDR_MULTICAST     0x0002U
  66
  67 #define IPV6_ADDR_LOOPBACK      0x0010U
  68 #define IPV6_ADDR_LINKLOCAL     0x0020U
  69 #define IPV6_ADDR_SITELOCAL     0x0040U
  70
  71 #define IPV6_ADDR_COMPATv4      0x0080U
  72
  73 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
  74
  75 #define IPV6_ADDR_MAPPED        0x1000U
  76 #define IPV6_ADDR_RESERVED      0x2000U /* reserved address space */
  77
  78 /*
  79  *      Addr scopes
  80  */
  81 #ifdef __KERNEL__
  82 #define IPV6_ADDR_MC_SCOPE(a)   \
  83         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  84 #define __IPV6_ADDR_SCOPE_INVALID       -1
  85 #endif
  86 #define IPV6_ADDR_SCOPE_NODELOCAL       0x01
  87 #define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
  88 #define IPV6_ADDR_SCOPE_SITELOCAL       0x05
  89 #define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
  90 #define IPV6_ADDR_SCOPE_GLOBAL          0x0e
  91
  92 /*
  93  *      fragmentation header
  94  */
  95
  96 struct frag_hdr {
  97         __u8    nexthdr;
  98         __u8    reserved;
  99         __be16  frag_off;
 100         __be32  identification;
 101 };
 102
 103 #define IP6_MF  0x0001
 104
 105 #ifdef __KERNEL__
 106
 107 #include <net/sock.h>
 108
 109 /* sysctls */
 110 extern int sysctl_mld_max_msf;
 111 extern struct ctl_path net_ipv6_ctl_path[];
 112
 113 #define _DEVINC(statname, modifier, idev, field)                        \
 114 ({                                                                      \
 115         struct inet6_dev *_idev = (idev);                               \
 116         if (likely(_idev != NULL))                                      \
 117                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 118         SNMP_INC_STATS##modifier(statname##_statistics, (field));       \
 119 })
 120
 121 #define _DEVADD(statname, modifier, idev, field, val)                   \
 122 ({                                                                      \
 123         struct inet6_dev *_idev = (idev);                               \
 124         if (likely(_idev != NULL))                                      \
 125                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 126         SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
 127 })
 128
 129 /* MIBs */
 130 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 131
 132 #define IP6_INC_STATS(idev,field)       _DEVINC(ipv6, , idev, field)
 133 #define IP6_INC_STATS_BH(idev,field)    _DEVINC(ipv6, _BH, idev, field)
 134 #define IP6_INC_STATS_USER(idev,field)  _DEVINC(ipv6, _USER, idev, field)
 135 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
 136
 137 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 138 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
 139
 140 #define ICMP6_INC_STATS(idev, field)    _DEVINC(icmpv6, , idev, field)
 141 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
 142 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
 143
 144 #define ICMP6MSGOUT_INC_STATS(idev, field) \
 145         _DEVINC(icmpv6msg, , idev, field +256)
 146 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
 147         _DEVINC(icmpv6msg, _BH, idev, field +256)
 148 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
 149         _DEVINC(icmpv6msg, _USER, idev, field +256)
 150 #define ICMP6MSGIN_INC_STATS(idev, field) \
 151          _DEVINC(icmpv6msg, , idev, field)
 152 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
 153         _DEVINC(icmpv6msg, _BH, idev, field)
 154 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
 155         _DEVINC(icmpv6msg, _USER, idev, field)
 156
 157 struct ip6_ra_chain
 158 {
 159         struct ip6_ra_chain     *next;
 160         struct sock             *sk;
 161         int                     sel;
 162         void                    (*destructor)(struct sock *);
 163 };
 164
 165 extern struct ip6_ra_chain      *ip6_ra_chain;
 166 extern rwlock_t ip6_ra_lock;
 167
 168 /*
 169    This structure is prepared by protocol, when parsing
 170    ancillary data and passed to IPv6.
 171  */
 172
 173 struct ipv6_txoptions
 174 {
 175         /* Length of this structure */
 176         int                     tot_len;
 177
 178         /* length of extension headers   */
 179
 180         __u16                   opt_flen;       /* after fragment hdr */
 181         __u16                   opt_nflen;      /* before fragment hdr */
 182
 183         struct ipv6_opt_hdr     *hopopt;
 184         struct ipv6_opt_hdr     *dst0opt;
 185         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 186         struct ipv6_opt_hdr     *dst1opt;
 187
 188         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 189 };
 190
 191 struct ip6_flowlabel
 192 {
 193         struct ip6_flowlabel    *next;
 194         __be32                  label;
 195         atomic_t                users;
 196         struct in6_addr         dst;
 197         struct ipv6_txoptions   *opt;
 198         unsigned long           linger;
 199         u8                      share;
 200         u32                     owner;
 201         unsigned long           lastuse;
 202         unsigned long           expires;
 203         struct net              *fl_net;
 204 };
 205
 206 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 207 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 208
 209 struct ipv6_fl_socklist
 210 {
 211         struct ipv6_fl_socklist *next;
 212         struct ip6_flowlabel    *fl;
 213 };
 214
 215 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 216 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 217                                                    struct ip6_flowlabel * fl,
 218                                                    struct ipv6_txoptions * fopt);
 219 extern void                     fl6_free_socklist(struct sock *sk);
 220 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 221 extern int                      ip6_flowlabel_init(void);
 222 extern void                     ip6_flowlabel_cleanup(void);
 223
 224 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 225 {
 226         if (fl)
 227                 atomic_dec(&fl->users);
 228 }
 229
 230 extern int                      ip6_ra_control(struct sock *sk, int sel);
 231
 232 extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 233
 234 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 235 extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 236                                                    int newtype,
 237                                                    struct ipv6_opt_hdr __user *newopt,
 238                                                    int newoptlen);
 239 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 240                                           struct ipv6_txoptions *opt);
 241
 242 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 243
 244 int ip6_frag_nqueues(struct net *net);
 245 int ip6_frag_mem(struct net *net);
 246
 247 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 248
 249 extern int __ipv6_addr_type(const struct in6_addr *addr);
 250 static inline int ipv6_addr_type(const struct in6_addr *addr)
 251 {
 252         return __ipv6_addr_type(addr) & 0xffff;
 253 }
 254
 255 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 256 {
 257         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 258 }
 259
 260 static inline int __ipv6_addr_src_scope(int type)
 261 {
 262         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 263 }
 264
 265 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 266 {
 267         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 268 }
 269
 270 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 271 {
 272         return memcmp(a1, a2, sizeof(struct in6_addr));
 273 }
 274
 275 static inline int
 276 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 277                      const struct in6_addr *a2)
 278 {
 279         return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
 280                    ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
 281                    ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
 282                    ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
 283 }
 284
 285 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 286 {
 287         memcpy(a1, a2, sizeof(struct in6_addr));
 288 }
 289
 290 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 291                                     const struct in6_addr *addr,
 292                                     int plen)
 293 {
 294         /* caller must guarantee 0 <= plen <= 128 */
 295         int o = plen >> 3,
 296             b = plen & 0x7;
 297
 298         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 299         memcpy(pfx->s6_addr, addr, o);
 300         if (b != 0)
 301                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 302 }
 303
 304 static inline void ipv6_addr_set(struct in6_addr *addr,
 305                                      __be32 w1, __be32 w2,
 306                                      __be32 w3, __be32 w4)
 307 {
 308         addr->s6_addr32[0] = w1;
 309         addr->s6_addr32[1] = w2;
 310         addr->s6_addr32[2] = w3;
 311         addr->s6_addr32[3] = w4;
 312 }
 313
 314 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 315                                   const struct in6_addr *a2)
 316 {
 317         return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
 318                  (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
 319                  (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
 320                  (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
 321 }
 322
 323 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 324                                       unsigned int prefixlen)
 325 {
 326         unsigned pdw, pbi;
 327
 328         /* check complete u32 in prefix */
 329         pdw = prefixlen >> 5;
 330         if (pdw && memcmp(a1, a2, pdw << 2))
 331                 return 0;
 332
 333         /* check incomplete u32 in prefix */
 334         pbi = prefixlen & 0x1f;
 335         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 336                 return 0;
 337
 338         return 1;
 339 }
 340
 341 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 342                                     const struct in6_addr *a2,
 343                                     unsigned int prefixlen)
 344 {
 345         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 346                                    prefixlen);
 347 }
 348
 349 struct inet_frag_queue;
 350
 351 struct ip6_create_arg {
 352         __be32 id;
 353         struct in6_addr *src;
 354         struct in6_addr *dst;
 355 };
 356
 357 void ip6_frag_init(struct inet_frag_queue *q, void *a);
 358 int ip6_frag_match(struct inet_frag_queue *q, void *a);
 359
 360 static inline int ipv6_addr_any(const struct in6_addr *a)
 361 {
 362         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 363                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 364 }
 365
 366 static inline int ipv6_addr_loopback(const struct in6_addr *a)
 367 {
 368         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 369                  a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
 370 }
 371
 372 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
 373 {
 374         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 375                  (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
 376 }
 377
 378 /*
 379  * Check for a RFC 4843 ORCHID address
 380  * (Overlay Routable Cryptographic Hash Identifiers)
 381  */
 382 static inline int ipv6_addr_orchid(const struct in6_addr *a)
 383 {
 384         return ((a->s6_addr32[0] & htonl(0xfffffff0))
 385                 == htonl(0x20010010));
 386 }
 387
 388 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
 389                                           struct in6_addr *v4mapped)
 390 {
 391         ipv6_addr_set(v4mapped,
 392                         0, 0,
 393                         htonl(0x0000FFFF),
 394                         addr);
 395 }
 396
 397 /*
 398  * find the first different bit between two addresses
 399  * length of address must be a multiple of 32bits
 400  */
 401 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 402 {
 403         const __be32 *a1 = token1, *a2 = token2;
 404         int i;
 405
 406         addrlen >>= 2;
 407
 408         for (i = 0; i < addrlen; i++) {
 409                 __be32 xb = a1[i] ^ a2[i];
 410                 if (xb)
 411                         return i * 32 + 32 - fls(ntohl(xb));
 412         }
 413
 414         /*
 415          *      we should *never* get to this point since that
 416          *      would mean the addrs are equal
 417          *
 418          *      However, we do get to it 8) And exacly, when
 419          *      addresses are equal 8)
 420          *
 421          *      ip route add 1111::/128 via ...
 422          *      ip route add 1111::/64 via ...
 423          *      and we are here.
 424          *
 425          *      Ideally, this function should stop comparison
 426          *      at prefix length. It does not, but it is still OK,
 427          *      if returned value is greater than prefix length.
 428          *                                      --ANK (980803)
 429          */
 430         return (addrlen << 5);
 431 }
 432
 433 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 434 {
 435         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 436 }
 437
 438 /*
 439  *      Prototypes exported by ipv6
 440  */
 441
 442 /*
 443  *      rcv function (called from netdevice level)
 444  */
 445
 446 extern int                      ipv6_rcv(struct sk_buff *skb,
 447                                          struct net_device *dev,
 448                                          struct packet_type *pt,
 449                                          struct net_device *orig_dev);
 450
 451 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 452
 453 /*
 454  *      upper-layer output functions
 455  */
 456 extern int                      ip6_xmit(struct sock *sk,
 457                                          struct sk_buff *skb,
 458                                          struct flowi *fl,
 459                                          struct ipv6_txoptions *opt,
 460                                          int ipfragok);
 461
 462 extern int                      ip6_nd_hdr(struct sock *sk,
 463                                            struct sk_buff *skb,
 464                                            struct net_device *dev,
 465                                            const struct in6_addr *saddr,
 466                                            const struct in6_addr *daddr,
 467                                            int proto, int len);
 468
 469 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 470
 471 extern int                      ip6_append_data(struct sock *sk,
 472                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 473                                                 void *from,
 474                                                 int length,
 475                                                 int transhdrlen,
 476                                                 int hlimit,
 477                                                 int tclass,
 478                                                 struct ipv6_txoptions *opt,
 479                                                 struct flowi *fl,
 480                                                 struct rt6_info *rt,
 481                                                 unsigned int flags);
 482
 483 extern int                      ip6_push_pending_frames(struct sock *sk);
 484
 485 extern void                     ip6_flush_pending_frames(struct sock *sk);
 486
 487 extern int                      ip6_dst_lookup(struct sock *sk,
 488                                                struct dst_entry **dst,
 489                                                struct flowi *fl);
 490 extern int                      ip6_dst_blackhole(struct sock *sk,
 491                                                   struct dst_entry **dst,
 492                                                   struct flowi *fl);
 493 extern int                      ip6_sk_dst_lookup(struct sock *sk,
 494                                                   struct dst_entry **dst,
 495                                                   struct flowi *fl);
 496
 497 /*
 498  *      skb processing functions
 499  */
 500
 501 extern int                      ip6_output(struct sk_buff *skb);
 502 extern int                      ip6_forward(struct sk_buff *skb);
 503 extern int                      ip6_input(struct sk_buff *skb);
 504 extern int                      ip6_mc_input(struct sk_buff *skb);
 505
 506 extern int                      __ip6_local_out(struct sk_buff *skb);
 507 extern int                      ip6_local_out(struct sk_buff *skb);
 508
 509 /*
 510  *      Extension header (options) processing
 511  */
 512
 513 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 514                                                      struct ipv6_txoptions *opt,
 515                                                      u8 *proto,
 516                                                      struct in6_addr **daddr_p);
 517 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 518                                                     struct ipv6_txoptions *opt,
 519                                                     u8 *proto);
 520
 521 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 522                                                  u8 *nexthdrp);
 523
 524 extern int                      ipv6_ext_hdr(u8 nexthdr);
 525
 526 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 527
 528 /*
 529  *      socket options (ipv6_sockglue.c)
 530  */
 531
 532 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 533                                                 int optname,
 534                                                 char __user *optval,
 535                                                 int optlen);
 536 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 537                                                 int optname,
 538                                                 char __user *optval,
 539                                                 int __user *optlen);
 540 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 541                                                 int level,
 542                                                 int optname,
 543                                                 char __user *optval,
 544                                                 int optlen);
 545 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 546                                                 int level,
 547                                                 int optname,
 548                                                 char __user *optval,
 549                                                 int __user *optlen);
 550
 551 extern int                      ip6_datagram_connect(struct sock *sk,
 552                                                      struct sockaddr *addr, int addr_len);
 553
 554 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 555 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 556                                                 u32 info, u8 *payload);
 557 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 558
 559 extern int inet6_release(struct socket *sock);
 560 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 561                       int addr_len);
 562 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 563                          int *uaddr_len, int peer);
 564 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 565                        unsigned long arg);
 566
 567 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 568                               struct sock *sk);
 569
 570 /*
 571  * reassembly.c
 572  */
 573 extern const struct proto_ops inet6_stream_ops;
 574 extern const struct proto_ops inet6_dgram_ops;
 575
 576 struct group_source_req;
 577 struct group_filter;
 578
 579 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 580                          struct group_source_req *pgsr);
 581 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 582 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 583                          struct group_filter __user *optval,
 584                          int __user *optlen);
 585
 586 #ifdef CONFIG_PROC_FS
 587 extern int  ac6_proc_init(struct net *net);
 588 extern void ac6_proc_exit(struct net *net);
 589 extern int  raw6_proc_init(void);
 590 extern void raw6_proc_exit(void);
 591 extern int  tcp6_proc_init(struct net *net);
 592 extern void tcp6_proc_exit(struct net *net);
 593 extern int  udp6_proc_init(struct net *net);
 594 extern void udp6_proc_exit(struct net *net);
 595 extern int  udplite6_proc_init(void);
 596 extern void udplite6_proc_exit(void);
 597 extern int  ipv6_misc_proc_init(void);
 598 extern void ipv6_misc_proc_exit(void);
 599 extern int snmp6_register_dev(struct inet6_dev *idev);
 600 extern int snmp6_unregister_dev(struct inet6_dev *idev);
 601
 602 #else
 603 static inline int ac6_proc_init(struct net *net) { return 0; }
 604 static inline void ac6_proc_exit(struct net *net) { }
 605 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
 606 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
 607 #endif
 608
 609 #ifdef CONFIG_SYSCTL
 610 extern ctl_table ipv6_route_table_template[];
 611 extern ctl_table ipv6_icmp_table_template[];
 612
 613 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
 614 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
 615 extern int ipv6_sysctl_register(void);
 616 extern void ipv6_sysctl_unregister(void);
 617 #endif
 618
 619 #endif /* __KERNEL__ */
 620 #endif /* _NET_IPV6_H */