linux/include/net/ipv6.h
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   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
  77/*
  78 *      Addr scopes
  79 */
  80#define IPV6_ADDR_MC_SCOPE(a)   \
  81        ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  82#define __IPV6_ADDR_SCOPE_INVALID       -1
  83#define IPV6_ADDR_SCOPE_NODELOCAL       0x01
  84#define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
  85#define IPV6_ADDR_SCOPE_SITELOCAL       0x05
  86#define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
  87#define IPV6_ADDR_SCOPE_GLOBAL          0x0e
  88
  89/*
  90 *      Addr flags
  91 */
  92#define IPV6_ADDR_MC_FLAG_TRANSIENT(a)  \
  93        ((a)->s6_addr[1] & 0x10)
  94#define IPV6_ADDR_MC_FLAG_PREFIX(a)     \
  95        ((a)->s6_addr[1] & 0x20)
  96#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
  97        ((a)->s6_addr[1] & 0x40)
  98
  99/*
 100 *      fragmentation header
 101 */
 102
 103struct frag_hdr {
 104        __u8    nexthdr;
 105        __u8    reserved;
 106        __be16  frag_off;
 107        __be32  identification;
 108};
 109
 110#define IP6_MF  0x0001
 111
 112#include <net/sock.h>
 113
 114/* sysctls */
 115extern int sysctl_mld_max_msf;
 116
 117#define _DEVINC(net, statname, modifier, idev, field)                   \
 118({                                                                      \
 119        struct inet6_dev *_idev = (idev);                               \
 120        if (likely(_idev != NULL))                                      \
 121                SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 122        SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
 123})
 124
 125/* per device counters are atomic_long_t */
 126#define _DEVINCATOMIC(net, statname, modifier, idev, field)             \
 127({                                                                      \
 128        struct inet6_dev *_idev = (idev);                               \
 129        if (likely(_idev != NULL))                                      \
 130                SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 131        SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
 132})
 133
 134/* per device and per net counters are atomic_long_t */
 135#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)               \
 136({                                                                      \
 137        struct inet6_dev *_idev = (idev);                               \
 138        if (likely(_idev != NULL))                                      \
 139                SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 140        SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
 141})
 142
 143#define _DEVADD(net, statname, modifier, idev, field, val)              \
 144({                                                                      \
 145        struct inet6_dev *_idev = (idev);                               \
 146        if (likely(_idev != NULL))                                      \
 147                SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 148        SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
 149})
 150
 151#define _DEVUPD(net, statname, modifier, idev, field, val)              \
 152({                                                                      \
 153        struct inet6_dev *_idev = (idev);                               \
 154        if (likely(_idev != NULL))                                      \
 155                SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
 156        SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
 157})
 158
 159/* MIBs */
 160
 161#define IP6_INC_STATS(net, idev,field)          \
 162                _DEVINC(net, ipv6, 64, idev, field)
 163#define IP6_INC_STATS_BH(net, idev,field)       \
 164                _DEVINC(net, ipv6, 64_BH, idev, field)
 165#define IP6_ADD_STATS(net, idev,field,val)      \
 166                _DEVADD(net, ipv6, 64, idev, field, val)
 167#define IP6_ADD_STATS_BH(net, idev,field,val)   \
 168                _DEVADD(net, ipv6, 64_BH, idev, field, val)
 169#define IP6_UPD_PO_STATS(net, idev,field,val)   \
 170                _DEVUPD(net, ipv6, 64, idev, field, val)
 171#define IP6_UPD_PO_STATS_BH(net, idev,field,val)   \
 172                _DEVUPD(net, ipv6, 64_BH, idev, field, val)
 173#define ICMP6_INC_STATS(net, idev, field)       \
 174                _DEVINCATOMIC(net, icmpv6, , idev, field)
 175#define ICMP6_INC_STATS_BH(net, idev, field)    \
 176                _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
 177
 178#define ICMP6MSGOUT_INC_STATS(net, idev, field)         \
 179        _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
 180#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field)      \
 181        _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
 182#define ICMP6MSGIN_INC_STATS_BH(net, idev, field)       \
 183        _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
 184
 185struct ip6_ra_chain {
 186        struct ip6_ra_chain     *next;
 187        struct sock             *sk;
 188        int                     sel;
 189        void                    (*destructor)(struct sock *);
 190};
 191
 192extern struct ip6_ra_chain      *ip6_ra_chain;
 193extern rwlock_t ip6_ra_lock;
 194
 195/*
 196   This structure is prepared by protocol, when parsing
 197   ancillary data and passed to IPv6.
 198 */
 199
 200struct ipv6_txoptions {
 201        /* Length of this structure */
 202        int                     tot_len;
 203
 204        /* length of extension headers   */
 205
 206        __u16                   opt_flen;       /* after fragment hdr */
 207        __u16                   opt_nflen;      /* before fragment hdr */
 208
 209        struct ipv6_opt_hdr     *hopopt;
 210        struct ipv6_opt_hdr     *dst0opt;
 211        struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 212        struct ipv6_opt_hdr     *dst1opt;
 213
 214        /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 215};
 216
 217struct ip6_flowlabel {
 218        struct ip6_flowlabel    *next;
 219        __be32                  label;
 220        atomic_t                users;
 221        struct in6_addr         dst;
 222        struct ipv6_txoptions   *opt;
 223        unsigned long           linger;
 224        u8                      share;
 225        u32                     owner;
 226        unsigned long           lastuse;
 227        unsigned long           expires;
 228        struct net              *fl_net;
 229};
 230
 231#define IPV6_FLOWINFO_MASK      cpu_to_be32(0x0FFFFFFF)
 232#define IPV6_FLOWLABEL_MASK     cpu_to_be32(0x000FFFFF)
 233
 234struct ipv6_fl_socklist {
 235        struct ipv6_fl_socklist *next;
 236        struct ip6_flowlabel    *fl;
 237};
 238
 239extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 240extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 241                                                   struct ip6_flowlabel * fl,
 242                                                   struct ipv6_txoptions * fopt);
 243extern void                     fl6_free_socklist(struct sock *sk);
 244extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 245extern int                      ip6_flowlabel_init(void);
 246extern void                     ip6_flowlabel_cleanup(void);
 247
 248static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 249{
 250        if (fl)
 251                atomic_dec(&fl->users);
 252}
 253
 254extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
 255
 256extern int                      ip6_ra_control(struct sock *sk, int sel);
 257
 258extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 259
 260extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 261extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 262                                                   int newtype,
 263                                                   struct ipv6_opt_hdr __user *newopt,
 264                                                   int newoptlen);
 265struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 266                                          struct ipv6_txoptions *opt);
 267
 268extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
 269
 270int ip6_frag_nqueues(struct net *net);
 271int ip6_frag_mem(struct net *net);
 272
 273#define IPV6_FRAG_HIGH_THRESH   (256 * 1024)    /* 262144 */
 274#define IPV6_FRAG_LOW_THRESH    (192 * 1024)    /* 196608 */
 275#define IPV6_FRAG_TIMEOUT       (60 * HZ)       /* 60 seconds */
 276
 277extern int __ipv6_addr_type(const struct in6_addr *addr);
 278static inline int ipv6_addr_type(const struct in6_addr *addr)
 279{
 280        return __ipv6_addr_type(addr) & 0xffff;
 281}
 282
 283static inline int ipv6_addr_scope(const struct in6_addr *addr)
 284{
 285        return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 286}
 287
 288static inline int __ipv6_addr_src_scope(int type)
 289{
 290        return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
 291}
 292
 293static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 294{
 295        return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 296}
 297
 298static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 299{
 300        return memcmp(a1, a2, sizeof(struct in6_addr));
 301}
 302
 303static inline bool
 304ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 305                     const struct in6_addr *a2)
 306{
 307#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 308        const unsigned long *ul1 = (const unsigned long *)a1;
 309        const unsigned long *ulm = (const unsigned long *)m;
 310        const unsigned long *ul2 = (const unsigned long *)a2;
 311
 312        return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
 313                  ((ul1[1] ^ ul2[1]) & ulm[1]));
 314#else
 315        return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
 316                  ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
 317                  ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
 318                  ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
 319#endif
 320}
 321
 322static inline void ipv6_addr_prefix(struct in6_addr *pfx, 
 323                                    const struct in6_addr *addr,
 324                                    int plen)
 325{
 326        /* caller must guarantee 0 <= plen <= 128 */
 327        int o = plen >> 3,
 328            b = plen & 0x7;
 329
 330        memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 331        memcpy(pfx->s6_addr, addr, o);
 332        if (b != 0)
 333                pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 334}
 335
 336static inline void ipv6_addr_set(struct in6_addr *addr, 
 337                                     __be32 w1, __be32 w2,
 338                                     __be32 w3, __be32 w4)
 339{
 340        addr->s6_addr32[0] = w1;
 341        addr->s6_addr32[1] = w2;
 342        addr->s6_addr32[2] = w3;
 343        addr->s6_addr32[3] = w4;
 344}
 345
 346static inline bool ipv6_addr_equal(const struct in6_addr *a1,
 347                                   const struct in6_addr *a2)
 348{
 349#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 350        const unsigned long *ul1 = (const unsigned long *)a1;
 351        const unsigned long *ul2 = (const unsigned long *)a2;
 352
 353        return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
 354#else
 355        return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
 356                (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
 357                (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
 358                (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
 359#endif
 360}
 361
 362static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 363                                       unsigned int prefixlen)
 364{
 365        unsigned int pdw, pbi;
 366
 367        /* check complete u32 in prefix */
 368        pdw = prefixlen >> 5;
 369        if (pdw && memcmp(a1, a2, pdw << 2))
 370                return false;
 371
 372        /* check incomplete u32 in prefix */
 373        pbi = prefixlen & 0x1f;
 374        if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 375                return false;
 376
 377        return true;
 378}
 379
 380static inline bool ipv6_prefix_equal(const struct in6_addr *a1,
 381                                     const struct in6_addr *a2,
 382                                     unsigned int prefixlen)
 383{
 384        return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 385                                   prefixlen);
 386}
 387
 388struct inet_frag_queue;
 389
 390enum ip6_defrag_users {
 391        IP6_DEFRAG_LOCAL_DELIVER,
 392        IP6_DEFRAG_CONNTRACK_IN,
 393        __IP6_DEFRAG_CONNTRACK_IN       = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
 394        IP6_DEFRAG_CONNTRACK_OUT,
 395        __IP6_DEFRAG_CONNTRACK_OUT      = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
 396        IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
 397        __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
 398};
 399
 400struct ip6_create_arg {
 401        __be32 id;
 402        u32 user;
 403        const struct in6_addr *src;
 404        const struct in6_addr *dst;
 405};
 406
 407void ip6_frag_init(struct inet_frag_queue *q, void *a);
 408bool ip6_frag_match(struct inet_frag_queue *q, void *a);
 409
 410static inline bool ipv6_addr_any(const struct in6_addr *a)
 411{
 412#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 413        const unsigned long *ul = (const unsigned long *)a;
 414
 415        return (ul[0] | ul[1]) == 0UL;
 416#else
 417        return (a->s6_addr32[0] | a->s6_addr32[1] |
 418                a->s6_addr32[2] | a->s6_addr32[3]) == 0;
 419#endif
 420}
 421
 422static inline u32 ipv6_addr_hash(const struct in6_addr *a)
 423{
 424#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 425        const unsigned long *ul = (const unsigned long *)a;
 426        unsigned long x = ul[0] ^ ul[1];
 427
 428        return (u32)(x ^ (x >> 32));
 429#else
 430        return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
 431                             a->s6_addr32[2] ^ a->s6_addr32[3]);
 432#endif
 433}
 434
 435static inline bool ipv6_addr_loopback(const struct in6_addr *a)
 436{
 437        return (a->s6_addr32[0] | a->s6_addr32[1] |
 438                a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
 439}
 440
 441static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
 442{
 443        return (a->s6_addr32[0] | a->s6_addr32[1] |
 444                 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
 445}
 446
 447/*
 448 * Check for a RFC 4843 ORCHID address
 449 * (Overlay Routable Cryptographic Hash Identifiers)
 450 */
 451static inline bool ipv6_addr_orchid(const struct in6_addr *a)
 452{
 453        return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
 454}
 455
 456static inline void ipv6_addr_set_v4mapped(const __be32 addr,
 457                                          struct in6_addr *v4mapped)
 458{
 459        ipv6_addr_set(v4mapped,
 460                        0, 0,
 461                        htonl(0x0000FFFF),
 462                        addr);
 463}
 464
 465/*
 466 * find the first different bit between two addresses
 467 * length of address must be a multiple of 32bits
 468 */
 469static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 470{
 471        const __be32 *a1 = token1, *a2 = token2;
 472        int i;
 473
 474        addrlen >>= 2;
 475
 476        for (i = 0; i < addrlen; i++) {
 477                __be32 xb = a1[i] ^ a2[i];
 478                if (xb)
 479                        return i * 32 + 31 - __fls(ntohl(xb));
 480        }
 481
 482        /*
 483         *      we should *never* get to this point since that 
 484         *      would mean the addrs are equal
 485         *
 486         *      However, we do get to it 8) And exacly, when
 487         *      addresses are equal 8)
 488         *
 489         *      ip route add 1111::/128 via ...
 490         *      ip route add 1111::/64 via ...
 491         *      and we are here.
 492         *
 493         *      Ideally, this function should stop comparison
 494         *      at prefix length. It does not, but it is still OK,
 495         *      if returned value is greater than prefix length.
 496         *                                      --ANK (980803)
 497         */
 498        return addrlen << 5;
 499}
 500
 501static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 502{
 503        return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 504}
 505
 506extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
 507
 508/*
 509 *      Prototypes exported by ipv6
 510 */
 511
 512/*
 513 *      rcv function (called from netdevice level)
 514 */
 515
 516extern int                      ipv6_rcv(struct sk_buff *skb, 
 517                                         struct net_device *dev, 
 518                                         struct packet_type *pt,
 519                                         struct net_device *orig_dev);
 520
 521extern int                      ip6_rcv_finish(struct sk_buff *skb);
 522
 523/*
 524 *      upper-layer output functions
 525 */
 526extern int                      ip6_xmit(struct sock *sk,
 527                                         struct sk_buff *skb,
 528                                         struct flowi6 *fl6,
 529                                         struct ipv6_txoptions *opt,
 530                                         int tclass);
 531
 532extern int                      ip6_nd_hdr(struct sock *sk,
 533                                           struct sk_buff *skb,
 534                                           struct net_device *dev,
 535                                           const struct in6_addr *saddr,
 536                                           const struct in6_addr *daddr,
 537                                           int proto, int len);
 538
 539extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 540
 541extern int                      ip6_append_data(struct sock *sk,
 542                                                int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 543                                                void *from,
 544                                                int length,
 545                                                int transhdrlen,
 546                                                int hlimit,
 547                                                int tclass,
 548                                                struct ipv6_txoptions *opt,
 549                                                struct flowi6 *fl6,
 550                                                struct rt6_info *rt,
 551                                                unsigned int flags,
 552                                                int dontfrag);
 553
 554extern int                      ip6_push_pending_frames(struct sock *sk);
 555
 556extern void                     ip6_flush_pending_frames(struct sock *sk);
 557
 558extern int                      ip6_dst_lookup(struct sock *sk,
 559                                               struct dst_entry **dst,
 560                                               struct flowi6 *fl6);
 561extern struct dst_entry *       ip6_dst_lookup_flow(struct sock *sk,
 562                                                    struct flowi6 *fl6,
 563                                                    const struct in6_addr *final_dst,
 564                                                    bool can_sleep);
 565extern struct dst_entry *       ip6_sk_dst_lookup_flow(struct sock *sk,
 566                                                       struct flowi6 *fl6,
 567                                                       const struct in6_addr *final_dst,
 568                                                       bool can_sleep);
 569extern struct dst_entry *       ip6_blackhole_route(struct net *net,
 570                                                    struct dst_entry *orig_dst);
 571
 572/*
 573 *      skb processing functions
 574 */
 575
 576extern int                      ip6_output(struct sk_buff *skb);
 577extern int                      ip6_forward(struct sk_buff *skb);
 578extern int                      ip6_input(struct sk_buff *skb);
 579extern int                      ip6_mc_input(struct sk_buff *skb);
 580
 581extern int                      __ip6_local_out(struct sk_buff *skb);
 582extern int                      ip6_local_out(struct sk_buff *skb);
 583
 584/*
 585 *      Extension header (options) processing
 586 */
 587
 588extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 589                                                     struct ipv6_txoptions *opt,
 590                                                     u8 *proto,
 591                                                     struct in6_addr **daddr_p);
 592extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 593                                                    struct ipv6_txoptions *opt,
 594                                                    u8 *proto);
 595
 596extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 597                                                 u8 *nexthdrp, __be16 *frag_offp);
 598
 599extern bool                     ipv6_ext_hdr(u8 nexthdr);
 600
 601extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 602
 603extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
 604                                       const struct ipv6_txoptions *opt,
 605                                       struct in6_addr *orig);
 606
 607/*
 608 *      socket options (ipv6_sockglue.c)
 609 */
 610
 611extern int                      ipv6_setsockopt(struct sock *sk, int level, 
 612                                                int optname,
 613                                                char __user *optval, 
 614                                                unsigned int optlen);
 615extern int                      ipv6_getsockopt(struct sock *sk, int level, 
 616                                                int optname,
 617                                                char __user *optval, 
 618                                                int __user *optlen);
 619extern int                      compat_ipv6_setsockopt(struct sock *sk,
 620                                                int level,
 621                                                int optname,
 622                                                char __user *optval,
 623                                                unsigned int optlen);
 624extern int                      compat_ipv6_getsockopt(struct sock *sk,
 625                                                int level,
 626                                                int optname,
 627                                                char __user *optval,
 628                                                int __user *optlen);
 629
 630extern int                      ip6_datagram_connect(struct sock *sk, 
 631                                                     struct sockaddr *addr, int addr_len);
 632
 633extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 634extern int                      ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
 635extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 636                                                u32 info, u8 *payload);
 637extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
 638extern void                     ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
 639
 640extern int inet6_release(struct socket *sock);
 641extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 
 642                      int addr_len);
 643extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 644                         int *uaddr_len, int peer);
 645extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 
 646                       unsigned long arg);
 647
 648extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 649                              struct sock *sk);
 650
 651/*
 652 * reassembly.c
 653 */
 654extern const struct proto_ops inet6_stream_ops;
 655extern const struct proto_ops inet6_dgram_ops;
 656
 657struct group_source_req;
 658struct group_filter;
 659
 660extern int ip6_mc_source(int add, int omode, struct sock *sk,
 661                         struct group_source_req *pgsr);
 662extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 663extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 664                         struct group_filter __user *optval,
 665                         int __user *optlen);
 666extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
 667                                    const struct in6_addr *daddr, u32 rnd);
 668
 669#ifdef CONFIG_PROC_FS
 670extern int  ac6_proc_init(struct net *net);
 671extern void ac6_proc_exit(struct net *net);
 672extern int  raw6_proc_init(void);
 673extern void raw6_proc_exit(void);
 674extern int  tcp6_proc_init(struct net *net);
 675extern void tcp6_proc_exit(struct net *net);
 676extern int  udp6_proc_init(struct net *net);
 677extern void udp6_proc_exit(struct net *net);
 678extern int  udplite6_proc_init(void);
 679extern void udplite6_proc_exit(void);
 680extern int  ipv6_misc_proc_init(void);
 681extern void ipv6_misc_proc_exit(void);
 682extern int snmp6_register_dev(struct inet6_dev *idev);
 683extern int snmp6_unregister_dev(struct inet6_dev *idev);
 684
 685#else
 686static inline int ac6_proc_init(struct net *net) { return 0; }
 687static inline void ac6_proc_exit(struct net *net) { }
 688static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
 689static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
 690#endif
 691
 692#ifdef CONFIG_SYSCTL
 693extern ctl_table ipv6_route_table_template[];
 694extern ctl_table ipv6_icmp_table_template[];
 695
 696extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
 697extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
 698extern int ipv6_sysctl_register(void);
 699extern void ipv6_sysctl_unregister(void);
 700#endif
 701
 702#endif /* _NET_IPV6_H */
 703
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