LXR linux/include/linux/ipv6.h

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