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
  19 struct in6_pktinfo {
  20         struct in6_addr ipi6_addr;
  21         int             ipi6_ifindex;
  22 };
  23
  24
  25 struct 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  */
  38 struct 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
  51 struct 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
  70 struct 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
  82 struct 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
  94 struct 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
 107 struct 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  */
 131 struct 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
 174 struct ipv6_params {
 175         __s32 disable_ipv6;
 176         __s32 autoconf;
 177 };
 178 extern struct ipv6_params ipv6_defaults;
 179 #endif
 180
 181 /* index values for the variables in ipv6_devconf */
 182 enum {
 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
 222 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 223 {
 224         return (struct ipv6hdr *)skb_network_header(skb);
 225 }
 226
 227 static 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
 237 struct 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
 257 static inline int inet6_iif(const struct sk_buff *skb)
 258 {
 259         return IP6CB(skb)->iif;
 260 }
 261
 262 struct 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
 269 struct tcp6_request_sock {
 270         struct tcp_request_sock   tcp6rsk_tcp;
 271         struct inet6_request_sock tcp6rsk_inet6;
 272 };
 273
 274 struct ipv6_mc_socklist;
 275 struct ipv6_ac_socklist;
 276 struct 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  */
 286 struct 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! */
 369 struct 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
 379 struct 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
 385 struct 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
 391 extern int inet6_sk_rebuild_header(struct sock *sk);
 392
 393 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 394 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 395 {
 396         return inet_sk(__sk)->pinet6;
 397 }
 398
 399 static 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
 406 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 407 {
 408         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 409 }
 410
 411 static 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
 423 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 424 {
 425         return (struct raw6_sock *)sk;
 426 }
 427
 428 static 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
 442 struct inet6_timewait_sock {
 443         struct in6_addr tw_v6_daddr;
 444         struct in6_addr tw_v6_rcv_saddr;
 445 };
 446
 447 struct tcp6_timewait_sock {
 448         struct tcp_timewait_sock   tcp6tw_tcp;
 449         struct inet6_timewait_sock tcp6tw_inet6;
 450 };
 451
 452 static 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
 458 static 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
 464 static 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
 470 static 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
 475 static 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
 484 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 485 {
 486         return NULL;
 487 }
 488
 489 static inline struct inet6_request_sock *
 490                         inet6_rsk(const struct request_sock *rsk)
 491 {
 492         return NULL;
 493 }
 494
 495 static 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 */