linux/include/linux/ipv6.h
<<
>>
Prefs
   1#ifndef _IPV6_H
   2#define _IPV6_H
   3
   4#include <linux/types.h>
   5#include <linux/in6.h>
   6#include <asm/byteorder.h>
   7
   8/* The latest drafts declared increase in minimal mtu up to 1280. */
   9
  10#define IPV6_MIN_MTU    1280
  11
  12/*
  13 *      Advanced API
  14 *      source interface/address selection, source routing, etc...
  15 *      *under construction*
  16 */
  17
  18
  19struct in6_pktinfo {
  20        struct in6_addr ipi6_addr;
  21        int             ipi6_ifindex;
  22};
  23
  24struct ip6_mtuinfo {
  25        struct sockaddr_in6     ip6m_addr;
  26        __u32                   ip6m_mtu;
  27};
  28
  29struct in6_ifreq {
  30        struct in6_addr ifr6_addr;
  31        __u32           ifr6_prefixlen;
  32        int             ifr6_ifindex; 
  33};
  34
  35#define IPV6_SRCRT_STRICT       0x01    /* Deprecated; will be removed */
  36#define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
  37#define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
  38
  39/*
  40 *      routing header
  41 */
  42struct ipv6_rt_hdr {
  43        __u8            nexthdr;
  44        __u8            hdrlen;
  45        __u8            type;
  46        __u8            segments_left;
  47
  48        /*
  49         *      type specific data
  50         *      variable length field
  51         */
  52};
  53
  54
  55struct ipv6_opt_hdr {
  56        __u8            nexthdr;
  57        __u8            hdrlen;
  58        /* 
  59         * TLV encoded option data follows.
  60         */
  61} __attribute__ ((packed));     /* required for some archs */
  62
  63#define ipv6_destopt_hdr ipv6_opt_hdr
  64#define ipv6_hopopt_hdr  ipv6_opt_hdr
  65
  66#ifdef __KERNEL__
  67#define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
  68#endif
  69
  70/*
  71 *      routing header type 0 (used in cmsghdr struct)
  72 */
  73
  74struct rt0_hdr {
  75        struct ipv6_rt_hdr      rt_hdr;
  76        __u32                   reserved;
  77        struct in6_addr         addr[0];
  78
  79#define rt0_type                rt_hdr.type
  80};
  81
  82/*
  83 *      routing header type 2
  84 */
  85
  86struct rt2_hdr {
  87        struct ipv6_rt_hdr      rt_hdr;
  88        __u32                   reserved;
  89        struct in6_addr         addr;
  90
  91#define rt2_type                rt_hdr.type
  92};
  93
  94/*
  95 *      home address option in destination options header
  96 */
  97
  98struct ipv6_destopt_hao {
  99        __u8                    type;
 100        __u8                    length;
 101        struct in6_addr         addr;
 102} __attribute__ ((__packed__));
 103
 104/*
 105 *      IPv6 fixed header
 106 *
 107 *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 108 *      are glued to priority now, forming "class".
 109 */
 110
 111struct ipv6hdr {
 112#if defined(__LITTLE_ENDIAN_BITFIELD)
 113        __u8                    priority:4,
 114                                version:4;
 115#elif defined(__BIG_ENDIAN_BITFIELD)
 116        __u8                    version:4,
 117                                priority:4;
 118#else
 119#error  "Please fix <asm/byteorder.h>"
 120#endif
 121        __u8                    flow_lbl[3];
 122
 123        __be16                  payload_len;
 124        __u8                    nexthdr;
 125        __u8                    hop_limit;
 126
 127        struct  in6_addr        saddr;
 128        struct  in6_addr        daddr;
 129};
 130
 131#ifdef __KERNEL__
 132/*
 133 * This structure contains configuration options per IPv6 link.
 134 */
 135struct ipv6_devconf {
 136        __s32           forwarding;
 137        __s32           hop_limit;
 138        __s32           mtu6;
 139        __s32           accept_ra;
 140        __s32           accept_redirects;
 141        __s32           autoconf;
 142        __s32           dad_transmits;
 143        __s32           rtr_solicits;
 144        __s32           rtr_solicit_interval;
 145        __s32           rtr_solicit_delay;
 146        __s32           force_mld_version;
 147#ifdef CONFIG_IPV6_PRIVACY
 148        __s32           use_tempaddr;
 149        __s32           temp_valid_lft;
 150        __s32           temp_prefered_lft;
 151        __s32           regen_max_retry;
 152        __s32           max_desync_factor;
 153#endif
 154        __s32           max_addresses;
 155        __s32           accept_ra_defrtr;
 156        __s32           accept_ra_pinfo;
 157#ifdef CONFIG_IPV6_ROUTER_PREF
 158        __s32           accept_ra_rtr_pref;
 159        __s32           rtr_probe_interval;
 160#ifdef CONFIG_IPV6_ROUTE_INFO
 161        __s32           accept_ra_rt_info_max_plen;
 162#endif
 163#endif
 164        __s32           proxy_ndp;
 165        __s32           accept_source_route;
 166#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 167        __s32           optimistic_dad;
 168#endif
 169#ifdef CONFIG_IPV6_MROUTE
 170        __s32           mc_forwarding;
 171#endif
 172        __s32           disable_ipv6;
 173        __s32           accept_dad;
 174        __s32           force_tllao;
 175        void            *sysctl;
 176};
 177
 178struct ipv6_params {
 179        __s32 disable_ipv6;
 180        __s32 autoconf;
 181};
 182extern struct ipv6_params ipv6_defaults;
 183#endif
 184
 185/* index values for the variables in ipv6_devconf */
 186enum {
 187        DEVCONF_FORWARDING = 0,
 188        DEVCONF_HOPLIMIT,
 189        DEVCONF_MTU6,
 190        DEVCONF_ACCEPT_RA,
 191        DEVCONF_ACCEPT_REDIRECTS,
 192        DEVCONF_AUTOCONF,
 193        DEVCONF_DAD_TRANSMITS,
 194        DEVCONF_RTR_SOLICITS,
 195        DEVCONF_RTR_SOLICIT_INTERVAL,
 196        DEVCONF_RTR_SOLICIT_DELAY,
 197        DEVCONF_USE_TEMPADDR,
 198        DEVCONF_TEMP_VALID_LFT,
 199        DEVCONF_TEMP_PREFERED_LFT,
 200        DEVCONF_REGEN_MAX_RETRY,
 201        DEVCONF_MAX_DESYNC_FACTOR,
 202        DEVCONF_MAX_ADDRESSES,
 203        DEVCONF_FORCE_MLD_VERSION,
 204        DEVCONF_ACCEPT_RA_DEFRTR,
 205        DEVCONF_ACCEPT_RA_PINFO,
 206        DEVCONF_ACCEPT_RA_RTR_PREF,
 207        DEVCONF_RTR_PROBE_INTERVAL,
 208        DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 209        DEVCONF_PROXY_NDP,
 210        DEVCONF_OPTIMISTIC_DAD,
 211        DEVCONF_ACCEPT_SOURCE_ROUTE,
 212        DEVCONF_MC_FORWARDING,
 213        DEVCONF_DISABLE_IPV6,
 214        DEVCONF_ACCEPT_DAD,
 215        DEVCONF_FORCE_TLLAO,
 216        DEVCONF_MAX
 217};
 218
 219#ifdef __KERNEL__
 220#include <linux/icmpv6.h>
 221#include <linux/tcp.h>
 222#include <linux/udp.h>
 223
 224#include <net/inet_sock.h>
 225
 226static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 227{
 228        return (struct ipv6hdr *)skb_network_header(skb);
 229}
 230
 231static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 232{
 233        return (struct ipv6hdr *)skb_transport_header(skb);
 234}
 235
 236/* 
 237   This structure contains results of exthdrs parsing
 238   as offsets from skb->nh.
 239 */
 240
 241struct inet6_skb_parm {
 242        int                     iif;
 243        __u16                   ra;
 244        __u16                   hop;
 245        __u16                   dst0;
 246        __u16                   srcrt;
 247        __u16                   dst1;
 248        __u16                   lastopt;
 249        __u32                   nhoff;
 250        __u16                   flags;
 251#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 252        __u16                   dsthao;
 253#endif
 254
 255#define IP6SKB_XFRM_TRANSFORMED 1
 256#define IP6SKB_FORWARDED        2
 257#define IP6SKB_REROUTED         4
 258};
 259
 260#define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 261#define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 262
 263static inline int inet6_iif(const struct sk_buff *skb)
 264{
 265        return IP6CB(skb)->iif;
 266}
 267
 268struct inet6_request_sock {
 269        struct in6_addr         loc_addr;
 270        struct in6_addr         rmt_addr;
 271        struct sk_buff          *pktopts;
 272        int                     iif;
 273};
 274
 275struct tcp6_request_sock {
 276        struct tcp_request_sock   tcp6rsk_tcp;
 277        struct inet6_request_sock tcp6rsk_inet6;
 278};
 279
 280struct ipv6_mc_socklist;
 281struct ipv6_ac_socklist;
 282struct ipv6_fl_socklist;
 283
 284/**
 285 * struct ipv6_pinfo - ipv6 private area
 286 *
 287 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 288 * this _must_ be the last member, so that inet6_sk_generic
 289 * is able to calculate its offset from the base struct sock
 290 * by using the struct proto->slab_obj_size member. -acme
 291 */
 292struct ipv6_pinfo {
 293        struct in6_addr         saddr;
 294        struct in6_addr         rcv_saddr;
 295        struct in6_addr         daddr;
 296        struct in6_pktinfo      sticky_pktinfo;
 297        struct in6_addr         *daddr_cache;
 298#ifdef CONFIG_IPV6_SUBTREES
 299        struct in6_addr         *saddr_cache;
 300#endif
 301
 302        __be32                  flow_label;
 303        __u32                   frag_size;
 304
 305        /*
 306         * Packed in 16bits.
 307         * Omit one shift by by putting the signed field at MSB.
 308         */
 309#if defined(__BIG_ENDIAN_BITFIELD)
 310        __s16                   hop_limit:9;
 311        __u16                   __unused_1:7;
 312#else
 313        __u16                   __unused_1:7;
 314        __s16                   hop_limit:9;
 315#endif
 316
 317#if defined(__BIG_ENDIAN_BITFIELD)
 318        /* Packed in 16bits. */
 319        __s16                   mcast_hops:9;
 320        __u16                   __unused_2:6,
 321                                mc_loop:1;
 322#else
 323        __u16                   mc_loop:1,
 324                                __unused_2:6;
 325        __s16                   mcast_hops:9;
 326#endif
 327        int                     mcast_oif;
 328
 329        /* pktoption flags */
 330        union {
 331                struct {
 332                        __u16   srcrt:1,
 333                                osrcrt:1,
 334                                rxinfo:1,
 335                                rxoinfo:1,
 336                                rxhlim:1,
 337                                rxohlim:1,
 338                                hopopts:1,
 339                                ohopopts:1,
 340                                dstopts:1,
 341                                odstopts:1,
 342                                rxflow:1,
 343                                rxtclass:1,
 344                                rxpmtu:1;
 345                } bits;
 346                __u16           all;
 347        } rxopt;
 348
 349        /* sockopt flags */
 350        __u16                   recverr:1,
 351                                sndflow:1,
 352                                pmtudisc:2,
 353                                ipv6only:1,
 354                                srcprefs:3,     /* 001: prefer temporary address
 355                                                 * 010: prefer public address
 356                                                 * 100: prefer care-of address
 357                                                 */
 358                                dontfrag:1;
 359        __u8                    min_hopcount;
 360        __u8                    tclass;
 361        __u8                    padding;
 362
 363        __u32                   dst_cookie;
 364
 365        struct ipv6_mc_socklist *ipv6_mc_list;
 366        struct ipv6_ac_socklist *ipv6_ac_list;
 367        struct ipv6_fl_socklist *ipv6_fl_list;
 368
 369        struct ipv6_txoptions   *opt;
 370        struct sk_buff          *pktoptions;
 371        struct sk_buff          *rxpmtu;
 372        struct {
 373                struct ipv6_txoptions *opt;
 374                u8 hop_limit;
 375                u8 tclass;
 376        } cork;
 377};
 378
 379/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 380struct raw6_sock {
 381        /* inet_sock has to be the first member of raw6_sock */
 382        struct inet_sock        inet;
 383        __u32                   checksum;       /* perform checksum */
 384        __u32                   offset;         /* checksum offset  */
 385        struct icmp6_filter     filter;
 386        __u32                   ip6mr_table;
 387        /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 388        struct ipv6_pinfo       inet6;
 389};
 390
 391struct udp6_sock {
 392        struct udp_sock   udp;
 393        /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 394        struct ipv6_pinfo inet6;
 395};
 396
 397struct tcp6_sock {
 398        struct tcp_sock   tcp;
 399        /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 400        struct ipv6_pinfo inet6;
 401};
 402
 403extern int inet6_sk_rebuild_header(struct sock *sk);
 404
 405#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 406static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 407{
 408        return inet_sk(__sk)->pinet6;
 409}
 410
 411static inline struct inet6_request_sock *
 412                        inet6_rsk(const struct request_sock *rsk)
 413{
 414        return (struct inet6_request_sock *)(((u8 *)rsk) +
 415                                             inet_rsk(rsk)->inet6_rsk_offset);
 416}
 417
 418static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 419{
 420        return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 421}
 422
 423static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 424{
 425        struct request_sock *req = reqsk_alloc(ops);
 426
 427        if (req != NULL) {
 428                inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 429                inet6_rsk(req)->pktopts = NULL;
 430        }
 431
 432        return req;
 433}
 434
 435static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 436{
 437        return (struct raw6_sock *)sk;
 438}
 439
 440static inline void inet_sk_copy_descendant(struct sock *sk_to,
 441                                           const struct sock *sk_from)
 442{
 443        int ancestor_size = sizeof(struct inet_sock);
 444
 445        if (sk_from->sk_family == PF_INET6)
 446                ancestor_size += sizeof(struct ipv6_pinfo);
 447
 448        __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 449}
 450
 451#define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 452#define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 453
 454struct inet6_timewait_sock {
 455        struct in6_addr tw_v6_daddr;
 456        struct in6_addr tw_v6_rcv_saddr;
 457};
 458
 459struct tcp6_timewait_sock {
 460        struct tcp_timewait_sock   tcp6tw_tcp;
 461        struct inet6_timewait_sock tcp6tw_inet6;
 462};
 463
 464static inline u16 inet6_tw_offset(const struct proto *prot)
 465{
 466        return prot->twsk_prot->twsk_obj_size -
 467                        sizeof(struct inet6_timewait_sock);
 468}
 469
 470static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 471{
 472        return (struct inet6_timewait_sock *)(((u8 *)sk) +
 473                                              inet_twsk(sk)->tw_ipv6_offset);
 474}
 475
 476static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 477{
 478        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 479                &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 480}
 481
 482static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 483{
 484        return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 485}
 486
 487static inline int inet_v6_ipv6only(const struct sock *sk)
 488{
 489        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 490                ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 491}
 492#else
 493#define __ipv6_only_sock(sk)    0
 494#define ipv6_only_sock(sk)      0
 495
 496static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 497{
 498        return NULL;
 499}
 500
 501static inline struct inet6_request_sock *
 502                        inet6_rsk(const struct request_sock *rsk)
 503{
 504        return NULL;
 505}
 506
 507static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 508{
 509        return NULL;
 510}
 511
 512#define __inet6_rcv_saddr(__sk) NULL
 513#define inet6_rcv_saddr(__sk)   NULL
 514#define tcp_twsk_ipv6only(__sk)         0
 515#define inet_v6_ipv6only(__sk)          0
 516#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 517
 518#define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 519        (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 520         ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
 521         ((__sk)->sk_family             == AF_INET6)            && \
 522         ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 523         ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 524         (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 525
 526#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
 527        (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 528         (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
 529         ((__sk)->sk_family            == PF_INET6)                     && \
 530         (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
 531         (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
 532         (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 533
 534#endif /* __KERNEL__ */
 535
 536#endif /* _IPV6_H */
 537
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.