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_GRE             47      /* GRE header. */
  38#define NEXTHDR_ESP             50      /* Encapsulating security payload. */
  39#define NEXTHDR_AUTH            51      /* Authentication header. */
  40#define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
  41#define NEXTHDR_NONE            59      /* No next header */
  42#define NEXTHDR_DEST            60      /* Destination options header. */
  43#define NEXTHDR_MOBILITY        135     /* Mobility header. */
  44
  45#define NEXTHDR_MAX             255
  46
  47
  48
  49#define IPV6_DEFAULT_HOPLIMIT   64
  50#define IPV6_DEFAULT_MCASTHOPS  1
  51
  52/*
  53 *      Addr type
  54 *      
  55 *      type    -       unicast | multicast
  56 *      scope   -       local   | site      | global
  57 *      v4      -       compat
  58 *      v4mapped
  59 *      any
  60 *      loopback
  61 */
  62
  63#define IPV6_ADDR_ANY           0x0000U
  64
  65#define IPV6_ADDR_UNICAST       0x0001U 
  66#define IPV6_ADDR_MULTICAST     0x0002U 
  67
  68#define IPV6_ADDR_LOOPBACK      0x0010U
  69#define IPV6_ADDR_LINKLOCAL     0x0020U
  70#define IPV6_ADDR_SITELOCAL     0x0040U
  71
  72#define IPV6_ADDR_COMPATv4      0x0080U
  73
  74#define IPV6_ADDR_SCOPE_MASK    0x00f0U
  75
  76#define IPV6_ADDR_MAPPED        0x1000U
  77
  78/*
  79 *      Addr scopes
  80 */
  81#define IPV6_ADDR_MC_SCOPE(a)   \
  82        ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  83#define __IPV6_ADDR_SCOPE_INVALID       -1
  84#define IPV6_ADDR_SCOPE_NODELOCAL       0x01
  85#define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
  86#define IPV6_ADDR_SCOPE_SITELOCAL       0x05
  87#define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
  88#define IPV6_ADDR_SCOPE_GLOBAL          0x0e
  89
  90/*
  91 *      Addr flags
  92 */
  93#define IPV6_ADDR_MC_FLAG_TRANSIENT(a)  \
  94        ((a)->s6_addr[1] & 0x10)
  95#define IPV6_ADDR_MC_FLAG_PREFIX(a)     \
  96        ((a)->s6_addr[1] & 0x20)
  97#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
  98        ((a)->s6_addr[1] & 0x40)
  99
 100/*
 101 *      fragmentation header
 102 */
 103
 104struct frag_hdr {
 105        __u8    nexthdr;
 106        __u8    reserved;
 107        __be16  frag_off;
 108        __be32  identification;
 109};
 110
 111#define IP6_MF  0x0001
 112
 113#include <net/sock.h>
 114
 115/* sysctls */
 116extern int sysctl_mld_max_msf;
 117
 118#define _DEVINC(net, statname, modifier, idev, field)                   \
 119({                                                                      \
 120        struct inet6_dev *_idev = (idev);                               \
 121        if (likely(_idev != NULL))                                      \
 122                SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 123        SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
 124})
 125
 126/* per device counters are atomic_long_t */
 127#define _DEVINCATOMIC(net, statname, modifier, idev, field)             \
 128({                                                                      \
 129        struct inet6_dev *_idev = (idev);                               \
 130        if (likely(_idev != NULL))                                      \
 131                SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 132        SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
 133})
 134
 135/* per device and per net counters are atomic_long_t */
 136#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)               \
 137({                                                                      \
 138        struct inet6_dev *_idev = (idev);                               \
 139        if (likely(_idev != NULL))                                      \
 140                SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 141        SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
 142})
 143
 144#define _DEVADD(net, statname, modifier, idev, field, val)              \
 145({                                                                      \
 146        struct inet6_dev *_idev = (idev);                               \
 147        if (likely(_idev != NULL))                                      \
 148                SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 149        SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
 150})
 151
 152#define _DEVUPD(net, statname, modifier, idev, field, val)              \
 153({                                                                      \
 154        struct inet6_dev *_idev = (idev);                               \
 155        if (likely(_idev != NULL))                                      \
 156                SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
 157        SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
 158})
 159
 160/* MIBs */
 161
 162#define IP6_INC_STATS(net, idev,field)          \
 163                _DEVINC(net, ipv6, 64, idev, field)
 164#define IP6_INC_STATS_BH(net, idev,field)       \
 165                _DEVINC(net, ipv6, 64_BH, idev, field)
 166#define IP6_ADD_STATS(net, idev,field,val)      \
 167                _DEVADD(net, ipv6, 64, idev, field, val)
 168#define IP6_ADD_STATS_BH(net, idev,field,val)   \
 169                _DEVADD(net, ipv6, 64_BH, idev, field, val)
 170#define IP6_UPD_PO_STATS(net, idev,field,val)   \
 171                _DEVUPD(net, ipv6, 64, idev, field, val)
 172#define IP6_UPD_PO_STATS_BH(net, idev,field,val)   \
 173                _DEVUPD(net, ipv6, 64_BH, idev, field, val)
 174#define ICMP6_INC_STATS(net, idev, field)       \
 175                _DEVINCATOMIC(net, icmpv6, , idev, field)
 176#define ICMP6_INC_STATS_BH(net, idev, field)    \
 177                _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
 178
 179#define ICMP6MSGOUT_INC_STATS(net, idev, field)         \
 180        _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
 181#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field)      \
 182        _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
 183#define ICMP6MSGIN_INC_STATS_BH(net, idev, field)       \
 184        _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
 185
 186struct ip6_ra_chain {
 187        struct ip6_ra_chain     *next;
 188        struct sock             *sk;
 189        int                     sel;
 190        void                    (*destructor)(struct sock *);
 191};
 192
 193extern struct ip6_ra_chain      *ip6_ra_chain;
 194extern rwlock_t ip6_ra_lock;
 195
 196/*
 197   This structure is prepared by protocol, when parsing
 198   ancillary data and passed to IPv6.
 199 */
 200
 201struct ipv6_txoptions {
 202        /* Length of this structure */
 203        int                     tot_len;
 204
 205        /* length of extension headers   */
 206
 207        __u16                   opt_flen;       /* after fragment hdr */
 208        __u16                   opt_nflen;      /* before fragment hdr */
 209
 210        struct ipv6_opt_hdr     *hopopt;
 211        struct ipv6_opt_hdr     *dst0opt;
 212        struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 213        struct ipv6_opt_hdr     *dst1opt;
 214
 215        /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 216};
 217
 218struct ip6_flowlabel {
 219        struct ip6_flowlabel    *next;
 220        __be32                  label;
 221        atomic_t                users;
 222        struct in6_addr         dst;
 223        struct ipv6_txoptions   *opt;
 224        unsigned long           linger;
 225        u8                      share;
 226        union {
 227                struct pid *pid;
 228                kuid_t uid;
 229        } owner;
 230        unsigned long           lastuse;
 231        unsigned long           expires;
 232        struct net              *fl_net;
 233};
 234
 235#define IPV6_FLOWINFO_MASK      cpu_to_be32(0x0FFFFFFF)
 236#define IPV6_FLOWLABEL_MASK     cpu_to_be32(0x000FFFFF)
 237
 238struct ipv6_fl_socklist {
 239        struct ipv6_fl_socklist *next;
 240        struct ip6_flowlabel    *fl;
 241};
 242
 243extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, __be32 label);
 244extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 245                                                   struct ip6_flowlabel * fl,
 246                                                   struct ipv6_txoptions * fopt);
 247extern void                     fl6_free_socklist(struct sock *sk);
 248extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 249extern int                      ip6_flowlabel_init(void);
 250extern void                     ip6_flowlabel_cleanup(void);
 251
 252static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 253{
 254        if (fl)
 255                atomic_dec(&fl->users);
 256}
 257
 258extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
 259
 260extern int                      ip6_ra_control(struct sock *sk, int sel);
 261
 262extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 263
 264extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 265extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 266                                                   int newtype,
 267                                                   struct ipv6_opt_hdr __user *newopt,
 268                                                   int newoptlen);
 269struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 270                                          struct ipv6_txoptions *opt);
 271
 272extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
 273
 274#if IS_ENABLED(CONFIG_IPV6)
 275static inline int ip6_frag_nqueues(struct net *net)
 276{
 277        return net->ipv6.frags.nqueues;
 278}
 279
 280static inline int ip6_frag_mem(struct net *net)
 281{
 282        return atomic_read(&net->ipv6.frags.mem);
 283}
 284#endif
 285
 286#define IPV6_FRAG_HIGH_THRESH   (256 * 1024)    /* 262144 */
 287#define IPV6_FRAG_LOW_THRESH    (192 * 1024)    /* 196608 */
 288#define IPV6_FRAG_TIMEOUT       (60 * HZ)       /* 60 seconds */
 289
 290extern int __ipv6_addr_type(const struct in6_addr *addr);
 291static inline int ipv6_addr_type(const struct in6_addr *addr)
 292{
 293        return __ipv6_addr_type(addr) & 0xffff;
 294}
 295
 296static inline int ipv6_addr_scope(const struct in6_addr *addr)
 297{
 298        return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 299}
 300
 301static inline int __ipv6_addr_src_scope(int type)
 302{
 303        return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
 304}
 305
 306static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 307{
 308        return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 309}
 310
 311static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 312{
 313        return memcmp(a1, a2, sizeof(struct in6_addr));
 314}
 315
 316static inline bool
 317ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 318                     const struct in6_addr *a2)
 319{
 320#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 321        const unsigned long *ul1 = (const unsigned long *)a1;
 322        const unsigned long *ulm = (const unsigned long *)m;
 323        const unsigned long *ul2 = (const unsigned long *)a2;
 324
 325        return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
 326                  ((ul1[1] ^ ul2[1]) & ulm[1]));
 327#else
 328        return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
 329                  ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
 330                  ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
 331                  ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
 332#endif
 333}
 334
 335static inline void ipv6_addr_prefix(struct in6_addr *pfx, 
 336                                    const struct in6_addr *addr,
 337                                    int plen)
 338{
 339        /* caller must guarantee 0 <= plen <= 128 */
 340        int o = plen >> 3,
 341            b = plen & 0x7;
 342
 343        memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 344        memcpy(pfx->s6_addr, addr, o);
 345        if (b != 0)
 346                pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 347}
 348
 349static inline void ipv6_addr_set(struct in6_addr *addr, 
 350                                     __be32 w1, __be32 w2,
 351                                     __be32 w3, __be32 w4)
 352{
 353        addr->s6_addr32[0] = w1;
 354        addr->s6_addr32[1] = w2;
 355        addr->s6_addr32[2] = w3;
 356        addr->s6_addr32[3] = w4;
 357}
 358
 359static inline bool ipv6_addr_equal(const struct in6_addr *a1,
 360                                   const struct in6_addr *a2)
 361{
 362#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 363        const unsigned long *ul1 = (const unsigned long *)a1;
 364        const unsigned long *ul2 = (const unsigned long *)a2;
 365
 366        return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
 367#else
 368        return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
 369                (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
 370                (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
 371                (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
 372#endif
 373}
 374
 375static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
 376                                       unsigned int prefixlen)
 377{
 378        unsigned int pdw, pbi;
 379
 380        /* check complete u32 in prefix */
 381        pdw = prefixlen >> 5;
 382        if (pdw && memcmp(a1, a2, pdw << 2))
 383                return false;
 384
 385        /* check incomplete u32 in prefix */
 386        pbi = prefixlen & 0x1f;
 387        if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 388                return false;
 389
 390        return true;
 391}
 392
 393static inline bool ipv6_prefix_equal(const struct in6_addr *a1,
 394                                     const struct in6_addr *a2,
 395                                     unsigned int prefixlen)
 396{
 397        return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 398                                   prefixlen);
 399}
 400
 401struct inet_frag_queue;
 402
 403enum ip6_defrag_users {
 404        IP6_DEFRAG_LOCAL_DELIVER,
 405        IP6_DEFRAG_CONNTRACK_IN,
 406        __IP6_DEFRAG_CONNTRACK_IN       = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
 407        IP6_DEFRAG_CONNTRACK_OUT,
 408        __IP6_DEFRAG_CONNTRACK_OUT      = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
 409        IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
 410        __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
 411};
 412
 413struct ip6_create_arg {
 414        __be32 id;
 415        u32 user;
 416        const struct in6_addr *src;
 417        const struct in6_addr *dst;
 418};
 419
 420void ip6_frag_init(struct inet_frag_queue *q, void *a);
 421bool ip6_frag_match(struct inet_frag_queue *q, void *a);
 422
 423/*
 424 *      Equivalent of ipv4 struct ip
 425 */
 426struct frag_queue {
 427        struct inet_frag_queue  q;
 428
 429        __be32                  id;             /* fragment id          */
 430        u32                     user;
 431        struct in6_addr         saddr;
 432        struct in6_addr         daddr;
 433
 434        int                     iif;
 435        unsigned int            csum;
 436        __u16                   nhoffset;
 437};
 438
 439void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
 440                           struct inet_frags *frags);
 441
 442static inline bool ipv6_addr_any(const struct in6_addr *a)
 443{
 444#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 445        const unsigned long *ul = (const unsigned long *)a;
 446
 447        return (ul[0] | ul[1]) == 0UL;
 448#else
 449        return (a->s6_addr32[0] | a->s6_addr32[1] |
 450                a->s6_addr32[2] | a->s6_addr32[3]) == 0;
 451#endif
 452}
 453
 454static inline u32 ipv6_addr_hash(const struct in6_addr *a)
 455{
 456#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 457        const unsigned long *ul = (const unsigned long *)a;
 458        unsigned long x = ul[0] ^ ul[1];
 459
 460        return (u32)(x ^ (x >> 32));
 461#else
 462        return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
 463                             a->s6_addr32[2] ^ a->s6_addr32[3]);
 464#endif
 465}
 466
 467static inline bool ipv6_addr_loopback(const struct in6_addr *a)
 468{
 469        return (a->s6_addr32[0] | a->s6_addr32[1] |
 470                a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
 471}
 472
 473static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
 474{
 475        return (a->s6_addr32[0] | a->s6_addr32[1] |
 476                 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0;
 477}
 478
 479/*
 480 * Check for a RFC 4843 ORCHID address
 481 * (Overlay Routable Cryptographic Hash Identifiers)
 482 */
 483static inline bool ipv6_addr_orchid(const struct in6_addr *a)
 484{
 485        return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
 486}
 487
 488static inline void ipv6_addr_set_v4mapped(const __be32 addr,
 489                                          struct in6_addr *v4mapped)
 490{
 491        ipv6_addr_set(v4mapped,
 492                        0, 0,
 493                        htonl(0x0000FFFF),
 494                        addr);
 495}
 496
 497/*
 498 * find the first different bit between two addresses
 499 * length of address must be a multiple of 32bits
 500 */
 501static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 502{
 503        const __be32 *a1 = token1, *a2 = token2;
 504        int i;
 505
 506        addrlen >>= 2;
 507
 508        for (i = 0; i < addrlen; i++) {
 509                __be32 xb = a1[i] ^ a2[i];
 510                if (xb)
 511                        return i * 32 + 31 - __fls(ntohl(xb));
 512        }
 513
 514        /*
 515         *      we should *never* get to this point since that 
 516         *      would mean the addrs are equal
 517         *
 518         *      However, we do get to it 8) And exacly, when
 519         *      addresses are equal 8)
 520         *
 521         *      ip route add 1111::/128 via ...
 522         *      ip route add 1111::/64 via ...
 523         *      and we are here.
 524         *
 525         *      Ideally, this function should stop comparison
 526         *      at prefix length. It does not, but it is still OK,
 527         *      if returned value is greater than prefix length.
 528         *                                      --ANK (980803)
 529         */
 530        return addrlen << 5;
 531}
 532
 533static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 534{
 535        return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 536}
 537
 538extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
 539
 540/*
 541 *      Prototypes exported by ipv6
 542 */
 543
 544/*
 545 *      rcv function (called from netdevice level)
 546 */
 547
 548extern int                      ipv6_rcv(struct sk_buff *skb, 
 549                                         struct net_device *dev, 
 550                                         struct packet_type *pt,
 551                                         struct net_device *orig_dev);
 552
 553extern int                      ip6_rcv_finish(struct sk_buff *skb);
 554
 555/*
 556 *      upper-layer output functions
 557 */
 558extern int                      ip6_xmit(struct sock *sk,
 559                                         struct sk_buff *skb,
 560                                         struct flowi6 *fl6,
 561                                         struct ipv6_txoptions *opt,
 562                                         int tclass);
 563
 564extern int                      ip6_nd_hdr(struct sock *sk,
 565                                           struct sk_buff *skb,
 566                                           struct net_device *dev,
 567                                           const struct in6_addr *saddr,
 568                                           const struct in6_addr *daddr,
 569                                           int proto, int len);
 570
 571extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 572
 573extern int                      ip6_append_data(struct sock *sk,
 574                                                int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 575                                                void *from,
 576                                                int length,
 577                                                int transhdrlen,
 578                                                int hlimit,
 579                                                int tclass,
 580                                                struct ipv6_txoptions *opt,
 581                                                struct flowi6 *fl6,
 582                                                struct rt6_info *rt,
 583                                                unsigned int flags,
 584                                                int dontfrag);
 585
 586extern int                      ip6_push_pending_frames(struct sock *sk);
 587
 588extern void                     ip6_flush_pending_frames(struct sock *sk);
 589
 590extern int                      ip6_dst_lookup(struct sock *sk,
 591                                               struct dst_entry **dst,
 592                                               struct flowi6 *fl6);
 593extern struct dst_entry *       ip6_dst_lookup_flow(struct sock *sk,
 594                                                    struct flowi6 *fl6,
 595                                                    const struct in6_addr *final_dst,
 596                                                    bool can_sleep);
 597extern struct dst_entry *       ip6_sk_dst_lookup_flow(struct sock *sk,
 598                                                       struct flowi6 *fl6,
 599                                                       const struct in6_addr *final_dst,
 600                                                       bool can_sleep);
 601extern struct dst_entry *       ip6_blackhole_route(struct net *net,
 602                                                    struct dst_entry *orig_dst);
 603
 604/*
 605 *      skb processing functions
 606 */
 607
 608extern int                      ip6_output(struct sk_buff *skb);
 609extern int                      ip6_forward(struct sk_buff *skb);
 610extern int                      ip6_input(struct sk_buff *skb);
 611extern int                      ip6_mc_input(struct sk_buff *skb);
 612
 613extern int                      __ip6_local_out(struct sk_buff *skb);
 614extern int                      ip6_local_out(struct sk_buff *skb);
 615
 616/*
 617 *      Extension header (options) processing
 618 */
 619
 620extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 621                                                     struct ipv6_txoptions *opt,
 622                                                     u8 *proto,
 623                                                     struct in6_addr **daddr_p);
 624extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 625                                                    struct ipv6_txoptions *opt,
 626                                                    u8 *proto);
 627
 628extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 629                                                 u8 *nexthdrp, __be16 *frag_offp);
 630
 631extern bool                     ipv6_ext_hdr(u8 nexthdr);
 632
 633extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 634
 635extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
 636                                       const struct ipv6_txoptions *opt,
 637                                       struct in6_addr *orig);
 638
 639/*
 640 *      socket options (ipv6_sockglue.c)
 641 */
 642
 643extern int                      ipv6_setsockopt(struct sock *sk, int level, 
 644                                                int optname,
 645                                                char __user *optval, 
 646                                                unsigned int optlen);
 647extern int                      ipv6_getsockopt(struct sock *sk, int level, 
 648                                                int optname,
 649                                                char __user *optval, 
 650                                                int __user *optlen);
 651extern int                      compat_ipv6_setsockopt(struct sock *sk,
 652                                                int level,
 653                                                int optname,
 654                                                char __user *optval,
 655                                                unsigned int optlen);
 656extern int                      compat_ipv6_getsockopt(struct sock *sk,
 657                                                int level,
 658                                                int optname,
 659                                                char __user *optval,
 660                                                int __user *optlen);
 661
 662extern int                      ip6_datagram_connect(struct sock *sk, 
 663                                                     struct sockaddr *addr, int addr_len);
 664
 665extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 666extern int                      ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
 667extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 668                                                u32 info, u8 *payload);
 669extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
 670extern void                     ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
 671
 672extern int inet6_release(struct socket *sock);
 673extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, 
 674                      int addr_len);
 675extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 676                         int *uaddr_len, int peer);
 677extern int inet6_ioctl(struct socket *sock, unsigned int cmd, 
 678                       unsigned long arg);
 679
 680extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 681                              struct sock *sk);
 682
 683/*
 684 * reassembly.c
 685 */
 686extern const struct proto_ops inet6_stream_ops;
 687extern const struct proto_ops inet6_dgram_ops;
 688
 689struct group_source_req;
 690struct group_filter;
 691
 692extern int ip6_mc_source(int add, int omode, struct sock *sk,
 693                         struct group_source_req *pgsr);
 694extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 695extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 696                         struct group_filter __user *optval,
 697                         int __user *optlen);
 698extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
 699                                    const struct in6_addr *daddr, u32 rnd);
 700
 701#ifdef CONFIG_PROC_FS
 702extern int  ac6_proc_init(struct net *net);
 703extern void ac6_proc_exit(struct net *net);
 704extern int  raw6_proc_init(void);
 705extern void raw6_proc_exit(void);
 706extern int  tcp6_proc_init(struct net *net);
 707extern void tcp6_proc_exit(struct net *net);
 708extern int  udp6_proc_init(struct net *net);
 709extern void udp6_proc_exit(struct net *net);
 710extern int  udplite6_proc_init(void);
 711extern void udplite6_proc_exit(void);
 712extern int  ipv6_misc_proc_init(void);
 713extern void ipv6_misc_proc_exit(void);
 714extern int snmp6_register_dev(struct inet6_dev *idev);
 715extern int snmp6_unregister_dev(struct inet6_dev *idev);
 716
 717#else
 718static inline int ac6_proc_init(struct net *net) { return 0; }
 719static inline void ac6_proc_exit(struct net *net) { }
 720static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
 721static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
 722#endif
 723
 724#ifdef CONFIG_SYSCTL
 725extern ctl_table ipv6_route_table_template[];
 726extern ctl_table ipv6_icmp_table_template[];
 727
 728extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
 729extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
 730extern int ipv6_sysctl_register(void);
 731extern void ipv6_sysctl_unregister(void);
 732#endif
 733
 734#endif /* _NET_IPV6_H */
 735
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