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 extern struct ctl_path net_ipv6_ctl_path[];
 114
 115 #define _DEVINC(statname, modifier, idev, field)                        \
 116 ({                                                                      \
 117         struct inet6_dev *_idev = (idev);                               \
 118         if (likely(_idev != NULL))                                      \
 119                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 120         SNMP_INC_STATS##modifier(statname##_statistics, (field));       \
 121 })
 122
 123 #define _DEVADD(statname, modifier, idev, field, val)                   \
 124 ({                                                                      \
 125         struct inet6_dev *_idev = (idev);                               \
 126         if (likely(_idev != NULL))                                      \
 127                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 128         SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
 129 })
 130
 131 /* MIBs */
 132 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 133
 134 #define IP6_INC_STATS(idev,field)       _DEVINC(ipv6, , idev, field)
 135 #define IP6_INC_STATS_BH(idev,field)    _DEVINC(ipv6, _BH, idev, field)
 136 #define IP6_INC_STATS_USER(idev,field)  _DEVINC(ipv6, _USER, idev, field)
 137 #define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
 138
 139 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 140 DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
 141
 142 #define ICMP6_INC_STATS(idev, field)    _DEVINC(icmpv6, , idev, field)
 143 #define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
 144 #define ICMP6_INC_STATS_USER(idev, field) _DEVINC(icmpv6, _USER, idev, field)
 145
 146 #define ICMP6MSGOUT_INC_STATS(idev, field) \
 147         _DEVINC(icmpv6msg, , idev, field +256)
 148 #define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
 149         _DEVINC(icmpv6msg, _BH, idev, field +256)
 150 #define ICMP6MSGOUT_INC_STATS_USER(idev, field) \
 151         _DEVINC(icmpv6msg, _USER, idev, field +256)
 152 #define ICMP6MSGIN_INC_STATS(idev, field) \
 153          _DEVINC(icmpv6msg, , idev, field)
 154 #define ICMP6MSGIN_INC_STATS_BH(idev, field) \
 155         _DEVINC(icmpv6msg, _BH, idev, field)
 156 #define ICMP6MSGIN_INC_STATS_USER(idev, field) \
 157         _DEVINC(icmpv6msg, _USER, idev, field)
 158
 159 struct ip6_ra_chain
 160 {
 161         struct ip6_ra_chain     *next;
 162         struct sock             *sk;
 163         int                     sel;
 164         void                    (*destructor)(struct sock *);
 165 };
 166
 167 extern struct ip6_ra_chain      *ip6_ra_chain;
 168 extern rwlock_t ip6_ra_lock;
 169
 170 /*
 171    This structure is prepared by protocol, when parsing
 172    ancillary data and passed to IPv6.
 173  */
 174
 175 struct ipv6_txoptions
 176 {
 177         /* Length of this structure */
 178         int                     tot_len;
 179
 180         /* length of extension headers   */
 181
 182         __u16                   opt_flen;       /* after fragment hdr */
 183         __u16                   opt_nflen;      /* before fragment hdr */
 184
 185         struct ipv6_opt_hdr     *hopopt;
 186         struct ipv6_opt_hdr     *dst0opt;
 187         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 188         struct ipv6_opt_hdr     *dst1opt;
 189
 190         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 191 };
 192
 193 struct ip6_flowlabel
 194 {
 195         struct ip6_flowlabel    *next;
 196         __be32                  label;
 197         atomic_t                users;
 198         struct in6_addr         dst;
 199         struct ipv6_txoptions   *opt;
 200         unsigned long           linger;
 201         u8                      share;
 202         u32                     owner;
 203         unsigned long           lastuse;
 204         unsigned long           expires;
 205         struct net              *fl_net;
 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(struct net *net);
 250
 251 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 252
 253 extern int __ipv6_addr_type(const struct in6_addr *addr);
 254 static inline int ipv6_addr_type(const struct in6_addr *addr)
 255 {
 256         return __ipv6_addr_type(addr) & 0xffff;
 257 }
 258
 259 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 260 {
 261         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 262 }
 263
 264 static inline int __ipv6_addr_src_scope(int type)
 265 {
 266         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 267 }
 268
 269 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 270 {
 271         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 272 }
 273
 274 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 275 {
 276         return memcmp(a1, a2, sizeof(struct in6_addr));
 277 }
 278
 279 static inline int
 280 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 281                      const struct in6_addr *a2)
 282 {
 283         return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
 284                    ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
 285                    ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
 286                    ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
 287 }
 288
 289 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 290 {
 291         memcpy(a1, a2, sizeof(struct in6_addr));
 292 }
 293
 294 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 295                                     const struct in6_addr *addr,
 296                                     int plen)
 297 {
 298         /* caller must guarantee 0 <= plen <= 128 */
 299         int o = plen >> 3,
 300             b = plen & 0x7;
 301
 302         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 303         memcpy(pfx->s6_addr, addr, o);
 304         if (b != 0)
 305                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 306 }
 307
 308 static inline void ipv6_addr_set(struct in6_addr *addr,
 309                                      __be32 w1, __be32 w2,
 310                                      __be32 w3, __be32 w4)
 311 {
 312         addr->s6_addr32[0] = w1;
 313         addr->s6_addr32[1] = w2;
 314         addr->s6_addr32[2] = w3;
 315         addr->s6_addr32[3] = w4;
 316 }
 317
 318 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 319                                   const struct in6_addr *a2)
 320 {
 321         return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
 322                  (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
 323                  (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
 324                  (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
 325 }
 326
 327 static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 328                                       unsigned int prefixlen)
 329 {
 330         unsigned pdw, pbi;
 331
 332         /* check complete u32 in prefix */
 333         pdw = prefixlen >> 5;
 334         if (pdw && memcmp(a1, a2, pdw << 2))
 335                 return 0;
 336
 337         /* check incomplete u32 in prefix */
 338         pbi = prefixlen & 0x1f;
 339         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 340                 return 0;
 341
 342         return 1;
 343 }
 344
 345 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 346                                     const struct in6_addr *a2,
 347                                     unsigned int prefixlen)
 348 {
 349         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 350                                    prefixlen);
 351 }
 352
 353 struct inet_frag_queue;
 354
 355 struct ip6_create_arg {
 356         __be32 id;
 357         struct in6_addr *src;
 358         struct in6_addr *dst;
 359 };
 360
 361 void ip6_frag_init(struct inet_frag_queue *q, void *a);
 362 int ip6_frag_match(struct inet_frag_queue *q, void *a);
 363
 364 static inline int ipv6_addr_any(const struct in6_addr *a)
 365 {
 366         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 367                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 368 }
 369
 370 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
 371 {
 372         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 373                  (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
 374 }
 375
 376 /*
 377  * Check for a RFC 4843 ORCHID address
 378  * (Overlay Routable Cryptographic Hash Identifiers)
 379  */
 380 static inline int ipv6_addr_orchid(const struct in6_addr *a)
 381 {
 382         return ((a->s6_addr32[0] & htonl(0xfffffff0))
 383                 == htonl(0x20010010));
 384 }
 385
 386 /*
 387  * find the first different bit between two addresses
 388  * length of address must be a multiple of 32bits
 389  */
 390 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 391 {
 392         const __be32 *a1 = token1, *a2 = token2;
 393         int i;
 394
 395         addrlen >>= 2;
 396
 397         for (i = 0; i < addrlen; i++) {
 398                 __be32 xb = a1[i] ^ a2[i];
 399                 if (xb)
 400                         return i * 32 + 32 - fls(ntohl(xb));
 401         }
 402
 403         /*
 404          *      we should *never* get to this point since that
 405          *      would mean the addrs are equal
 406          *
 407          *      However, we do get to it 8) And exacly, when
 408          *      addresses are equal 8)
 409          *
 410          *      ip route add 1111::/128 via ...
 411          *      ip route add 1111::/64 via ...
 412          *      and we are here.
 413          *
 414          *      Ideally, this function should stop comparison
 415          *      at prefix length. It does not, but it is still OK,
 416          *      if returned value is greater than prefix length.
 417          *                                      --ANK (980803)
 418          */
 419         return (addrlen << 5);
 420 }
 421
 422 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 423 {
 424         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 425 }
 426
 427 /*
 428  *      Prototypes exported by ipv6
 429  */
 430
 431 /*
 432  *      rcv function (called from netdevice level)
 433  */
 434
 435 extern int                      ipv6_rcv(struct sk_buff *skb,
 436                                          struct net_device *dev,
 437                                          struct packet_type *pt,
 438                                          struct net_device *orig_dev);
 439
 440 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 441
 442 /*
 443  *      upper-layer output functions
 444  */
 445 extern int                      ip6_xmit(struct sock *sk,
 446                                          struct sk_buff *skb,
 447                                          struct flowi *fl,
 448                                          struct ipv6_txoptions *opt,
 449                                          int ipfragok);
 450
 451 extern int                      ip6_nd_hdr(struct sock *sk,
 452                                            struct sk_buff *skb,
 453                                            struct net_device *dev,
 454                                            struct in6_addr *saddr,
 455                                            struct in6_addr *daddr,
 456                                            int proto, int len);
 457
 458 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 459
 460 extern int                      ip6_append_data(struct sock *sk,
 461                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 462                                                 void *from,
 463                                                 int length,
 464                                                 int transhdrlen,
 465                                                 int hlimit,
 466                                                 int tclass,
 467                                                 struct ipv6_txoptions *opt,
 468                                                 struct flowi *fl,
 469                                                 struct rt6_info *rt,
 470                                                 unsigned int flags);
 471
 472 extern int                      ip6_push_pending_frames(struct sock *sk);
 473
 474 extern void                     ip6_flush_pending_frames(struct sock *sk);
 475
 476 extern int                      ip6_dst_lookup(struct sock *sk,
 477                                                struct dst_entry **dst,
 478                                                struct flowi *fl);
 479 extern int                      ip6_dst_blackhole(struct sock *sk,
 480                                                   struct dst_entry **dst,
 481                                                   struct flowi *fl);
 482 extern int                      ip6_sk_dst_lookup(struct sock *sk,
 483                                                   struct dst_entry **dst,
 484                                                   struct flowi *fl);
 485
 486 /*
 487  *      skb processing functions
 488  */
 489
 490 extern int                      ip6_output(struct sk_buff *skb);
 491 extern int                      ip6_forward(struct sk_buff *skb);
 492 extern int                      ip6_input(struct sk_buff *skb);
 493 extern int                      ip6_mc_input(struct sk_buff *skb);
 494
 495 extern int                      __ip6_local_out(struct sk_buff *skb);
 496 extern int                      ip6_local_out(struct sk_buff *skb);
 497
 498 /*
 499  *      Extension header (options) processing
 500  */
 501
 502 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 503                                                      struct ipv6_txoptions *opt,
 504                                                      u8 *proto,
 505                                                      struct in6_addr **daddr_p);
 506 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 507                                                     struct ipv6_txoptions *opt,
 508                                                     u8 *proto);
 509
 510 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 511                                                  u8 *nexthdrp);
 512
 513 extern int                      ipv6_ext_hdr(u8 nexthdr);
 514
 515 extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 516
 517 /*
 518  *      socket options (ipv6_sockglue.c)
 519  */
 520
 521 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 522                                                 int optname,
 523                                                 char __user *optval,
 524                                                 int optlen);
 525 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 526                                                 int optname,
 527                                                 char __user *optval,
 528                                                 int __user *optlen);
 529 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 530                                                 int level,
 531                                                 int optname,
 532                                                 char __user *optval,
 533                                                 int optlen);
 534 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 535                                                 int level,
 536                                                 int optname,
 537                                                 char __user *optval,
 538                                                 int __user *optlen);
 539
 540 extern int                      ip6_datagram_connect(struct sock *sk,
 541                                                      struct sockaddr *addr, int addr_len);
 542
 543 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 544 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 545                                                 u32 info, u8 *payload);
 546 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 547
 548 extern int inet6_release(struct socket *sock);
 549 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 550                       int addr_len);
 551 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 552                          int *uaddr_len, int peer);
 553 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 554                        unsigned long arg);
 555
 556 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 557                               struct sock *sk);
 558
 559 /*
 560  * reassembly.c
 561  */
 562 extern const struct proto_ops inet6_stream_ops;
 563 extern const struct proto_ops inet6_dgram_ops;
 564
 565 struct group_source_req;
 566 struct group_filter;
 567
 568 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 569                          struct group_source_req *pgsr);
 570 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 571 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 572                          struct group_filter __user *optval,
 573                          int __user *optlen);
 574
 575 #ifdef CONFIG_PROC_FS
 576 extern int  ac6_proc_init(struct net *net);
 577 extern void ac6_proc_exit(struct net *net);
 578 extern int  raw6_proc_init(void);
 579 extern void raw6_proc_exit(void);
 580 extern int  tcp6_proc_init(struct net *net);
 581 extern void tcp6_proc_exit(struct net *net);
 582 extern int  udp6_proc_init(struct net *net);
 583 extern void udp6_proc_exit(struct net *net);
 584 extern int  udplite6_proc_init(void);
 585 extern void udplite6_proc_exit(void);
 586 extern int  ipv6_misc_proc_init(void);
 587 extern void ipv6_misc_proc_exit(void);
 588 extern int snmp6_register_dev(struct inet6_dev *idev);
 589 extern int snmp6_unregister_dev(struct inet6_dev *idev);
 590
 591 #else
 592 static inline int ac6_proc_init(struct net *net) { return 0; }
 593 static inline void ac6_proc_exit(struct net *net) { }
 594 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
 595 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
 596 #endif
 597
 598 #ifdef CONFIG_SYSCTL
 599 extern ctl_table ipv6_route_table_template[];
 600 extern ctl_table ipv6_icmp_table_template[];
 601
 602 extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
 603 extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
 604 extern int ipv6_sysctl_register(void);
 605 extern void ipv6_sysctl_unregister(void);
 606 #endif
 607
 608 #endif /* __KERNEL__ */
 609 #endif /* _NET_IPV6_H */