linux/include/linux/ipv6.h
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   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
 236static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
 237{
 238        return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
 239}
 240
 241/* 
 242   This structure contains results of exthdrs parsing
 243   as offsets from skb->nh.
 244 */
 245
 246struct inet6_skb_parm {
 247        int                     iif;
 248        __u16                   ra;
 249        __u16                   hop;
 250        __u16                   dst0;
 251        __u16                   srcrt;
 252        __u16                   dst1;
 253        __u16                   lastopt;
 254        __u16                   nhoff;
 255        __u16                   flags;
 256#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 257        __u16                   dsthao;
 258#endif
 259
 260#define IP6SKB_XFRM_TRANSFORMED 1
 261#define IP6SKB_FORWARDED        2
 262#define IP6SKB_REROUTED         4
 263};
 264
 265#define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 266#define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 267
 268static inline int inet6_iif(const struct sk_buff *skb)
 269{
 270        return IP6CB(skb)->iif;
 271}
 272
 273struct inet6_request_sock {
 274        struct in6_addr         loc_addr;
 275        struct in6_addr         rmt_addr;
 276        struct sk_buff          *pktopts;
 277        int                     iif;
 278};
 279
 280struct tcp6_request_sock {
 281        struct tcp_request_sock   tcp6rsk_tcp;
 282        struct inet6_request_sock tcp6rsk_inet6;
 283};
 284
 285struct ipv6_mc_socklist;
 286struct ipv6_ac_socklist;
 287struct ipv6_fl_socklist;
 288
 289/**
 290 * struct ipv6_pinfo - ipv6 private area
 291 *
 292 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 293 * this _must_ be the last member, so that inet6_sk_generic
 294 * is able to calculate its offset from the base struct sock
 295 * by using the struct proto->slab_obj_size member. -acme
 296 */
 297struct ipv6_pinfo {
 298        struct in6_addr         saddr;
 299        struct in6_addr         rcv_saddr;
 300        struct in6_addr         daddr;
 301        struct in6_pktinfo      sticky_pktinfo;
 302        const struct in6_addr           *daddr_cache;
 303#ifdef CONFIG_IPV6_SUBTREES
 304        const struct in6_addr           *saddr_cache;
 305#endif
 306
 307        __be32                  flow_label;
 308        __u32                   frag_size;
 309
 310        /*
 311         * Packed in 16bits.
 312         * Omit one shift by by putting the signed field at MSB.
 313         */
 314#if defined(__BIG_ENDIAN_BITFIELD)
 315        __s16                   hop_limit:9;
 316        __u16                   __unused_1:7;
 317#else
 318        __u16                   __unused_1:7;
 319        __s16                   hop_limit:9;
 320#endif
 321
 322#if defined(__BIG_ENDIAN_BITFIELD)
 323        /* Packed in 16bits. */
 324        __s16                   mcast_hops:9;
 325        __u16                   __unused_2:6,
 326                                mc_loop:1;
 327#else
 328        __u16                   mc_loop:1,
 329                                __unused_2:6;
 330        __s16                   mcast_hops:9;
 331#endif
 332        int                     ucast_oif;
 333        int                     mcast_oif;
 334
 335        /* pktoption flags */
 336        union {
 337                struct {
 338                        __u16   srcrt:1,
 339                                osrcrt:1,
 340                                rxinfo:1,
 341                                rxoinfo:1,
 342                                rxhlim:1,
 343                                rxohlim:1,
 344                                hopopts:1,
 345                                ohopopts:1,
 346                                dstopts:1,
 347                                odstopts:1,
 348                                rxflow:1,
 349                                rxtclass:1,
 350                                rxpmtu:1,
 351                                rxorigdstaddr:1;
 352                                /* 2 bits hole */
 353                } bits;
 354                __u16           all;
 355        } rxopt;
 356
 357        /* sockopt flags */
 358        __u16                   recverr:1,
 359                                sndflow:1,
 360                                pmtudisc:2,
 361                                ipv6only:1,
 362                                srcprefs:3,     /* 001: prefer temporary address
 363                                                 * 010: prefer public address
 364                                                 * 100: prefer care-of address
 365                                                 */
 366                                dontfrag:1;
 367        __u8                    min_hopcount;
 368        __u8                    tclass;
 369        __u8                    rcv_tclass;
 370
 371        __u32                   dst_cookie;
 372        __u32                   rx_dst_cookie;
 373
 374        struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 375        struct ipv6_ac_socklist *ipv6_ac_list;
 376        struct ipv6_fl_socklist *ipv6_fl_list;
 377
 378        struct ipv6_txoptions   *opt;
 379        struct sk_buff          *pktoptions;
 380        struct sk_buff          *rxpmtu;
 381        struct {
 382                struct ipv6_txoptions *opt;
 383                u8 hop_limit;
 384                u8 tclass;
 385        } cork;
 386};
 387
 388/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 389struct raw6_sock {
 390        /* inet_sock has to be the first member of raw6_sock */
 391        struct inet_sock        inet;
 392        __u32                   checksum;       /* perform checksum */
 393        __u32                   offset;         /* checksum offset  */
 394        struct icmp6_filter     filter;
 395        __u32                   ip6mr_table;
 396        /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 397        struct ipv6_pinfo       inet6;
 398};
 399
 400struct udp6_sock {
 401        struct udp_sock   udp;
 402        /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 403        struct ipv6_pinfo inet6;
 404};
 405
 406struct tcp6_sock {
 407        struct tcp_sock   tcp;
 408        /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 409        struct ipv6_pinfo inet6;
 410};
 411
 412extern int inet6_sk_rebuild_header(struct sock *sk);
 413
 414struct inet6_timewait_sock {
 415        struct in6_addr tw_v6_daddr;
 416        struct in6_addr tw_v6_rcv_saddr;
 417};
 418
 419struct tcp6_timewait_sock {
 420        struct tcp_timewait_sock   tcp6tw_tcp;
 421        struct inet6_timewait_sock tcp6tw_inet6;
 422};
 423
 424static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 425{
 426        return (struct inet6_timewait_sock *)(((u8 *)sk) +
 427                                              inet_twsk(sk)->tw_ipv6_offset);
 428}
 429
 430#if IS_ENABLED(CONFIG_IPV6)
 431static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 432{
 433        return inet_sk(__sk)->pinet6;
 434}
 435
 436static inline struct inet6_request_sock *
 437                        inet6_rsk(const struct request_sock *rsk)
 438{
 439        return (struct inet6_request_sock *)(((u8 *)rsk) +
 440                                             inet_rsk(rsk)->inet6_rsk_offset);
 441}
 442
 443static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 444{
 445        return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 446}
 447
 448static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 449{
 450        struct request_sock *req = reqsk_alloc(ops);
 451
 452        if (req != NULL) {
 453                inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 454                inet6_rsk(req)->pktopts = NULL;
 455        }
 456
 457        return req;
 458}
 459
 460static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 461{
 462        return (struct raw6_sock *)sk;
 463}
 464
 465static inline void inet_sk_copy_descendant(struct sock *sk_to,
 466                                           const struct sock *sk_from)
 467{
 468        int ancestor_size = sizeof(struct inet_sock);
 469
 470        if (sk_from->sk_family == PF_INET6)
 471                ancestor_size += sizeof(struct ipv6_pinfo);
 472
 473        __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 474}
 475
 476#define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 477#define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 478
 479static inline u16 inet6_tw_offset(const struct proto *prot)
 480{
 481        return prot->twsk_prot->twsk_obj_size -
 482                        sizeof(struct inet6_timewait_sock);
 483}
 484
 485static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 486{
 487        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 488                &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 489}
 490
 491static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 492{
 493        return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 494}
 495
 496static inline int inet_v6_ipv6only(const struct sock *sk)
 497{
 498        return likely(sk->sk_state != TCP_TIME_WAIT) ?
 499                ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 500}
 501#else
 502#define __ipv6_only_sock(sk)    0
 503#define ipv6_only_sock(sk)      0
 504
 505static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 506{
 507        return NULL;
 508}
 509
 510static inline struct inet6_request_sock *
 511                        inet6_rsk(const struct request_sock *rsk)
 512{
 513        return NULL;
 514}
 515
 516static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 517{
 518        return NULL;
 519}
 520
 521#define __inet6_rcv_saddr(__sk) NULL
 522#define inet6_rcv_saddr(__sk)   NULL
 523#define tcp_twsk_ipv6only(__sk)         0
 524#define inet_v6_ipv6only(__sk)          0
 525#endif /* IS_ENABLED(CONFIG_IPV6) */
 526
 527#define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 528        (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 529         ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
 530         ((__sk)->sk_family             == AF_INET6)            && \
 531         ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 532         ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 533         (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 534
 535#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
 536        (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 537         (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
 538         ((__sk)->sk_family            == PF_INET6)                     && \
 539         (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
 540         (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
 541         (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 542
 543#endif /* __KERNEL__ */
 544
 545#endif /* _IPV6_H */
 546
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