include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <linux/in6.h>
   5 #include <asm/byteorder.h>
   6
   7 /* The latest drafts declared increase in minimal mtu up to 1280. */
   8
   9 #define IPV6_MIN_MTU    1280
  10
  11 /*
  12  *      Advanced API
  13  *      source interface/address selection, source routing, etc...
  14  *      *under construction*
  15  */
  16
  17
  18 struct in6_pktinfo {
  19         struct in6_addr ipi6_addr;
  20         int             ipi6_ifindex;
  21 };
  22
  23
  24 struct in6_ifreq {
  25         struct in6_addr ifr6_addr;
  26         __u32           ifr6_prefixlen;
  27         int             ifr6_ifindex;
  28 };
  29
  30 #define IPV6_SRCRT_STRICT       0x01    /* this hop must be a neighbor  */
  31 #define IPV6_SRCRT_TYPE_0       0       /* IPv6 type 0 Routing Header   */
  32 #define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
  33
  34 /*
  35  *      routing header
  36  */
  37 struct ipv6_rt_hdr {
  38         __u8            nexthdr;
  39         __u8            hdrlen;
  40         __u8            type;
  41         __u8            segments_left;
  42
  43         /*
  44          *      type specific data
  45          *      variable length field
  46          */
  47 };
  48
  49
  50 struct ipv6_opt_hdr {
  51         __u8            nexthdr;
  52         __u8            hdrlen;
  53         /*
  54          * TLV encoded option data follows.
  55          */
  56 };
  57
  58 #define ipv6_destopt_hdr ipv6_opt_hdr
  59 #define ipv6_hopopt_hdr  ipv6_opt_hdr
  60
  61 #ifdef __KERNEL__
  62 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
  63 #endif
  64
  65 /*
  66  *      routing header type 0 (used in cmsghdr struct)
  67  */
  68
  69 struct rt0_hdr {
  70         struct ipv6_rt_hdr      rt_hdr;
  71         __u32                   reserved;
  72         struct in6_addr         addr[0];
  73
  74 #define rt0_type                rt_hdr.type
  75 };
  76
  77 /*
  78  *      routing header type 2
  79  */
  80
  81 struct rt2_hdr {
  82         struct ipv6_rt_hdr      rt_hdr;
  83         __u32                   reserved;
  84         struct in6_addr         addr;
  85
  86 #define rt2_type                rt_hdr.type
  87 };
  88
  89 /*
  90  *      home address option in destination options header
  91  */
  92
  93 struct ipv6_destopt_hao {
  94         __u8                    type;
  95         __u8                    length;
  96         struct in6_addr         addr;
  97 } __attribute__ ((__packed__));
  98
  99 struct ipv6_auth_hdr {
 100         __u8  nexthdr;
 101         __u8  hdrlen;           /* This one is measured in 32 bit units! */
 102         __be16 reserved;
 103         __be32 spi;
 104         __be32 seq_no;           /* Sequence number */
 105         __u8  auth_data[0];     /* Length variable but >=4. Mind the 64 bit alignment! */
 106 };
 107
 108 struct ipv6_esp_hdr {
 109         __be32 spi;
 110         __be32 seq_no;           /* Sequence number */
 111         __u8  enc_data[0];      /* Length variable but >=8. Mind the 64 bit alignment! */
 112 };
 113
 114 struct ipv6_comp_hdr {
 115         __u8 nexthdr;
 116         __u8 flags;
 117         __be16 cpi;
 118 };
 119
 120 /*
 121  *      IPv6 fixed header
 122  *
 123  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 124  *      are glued to priority now, forming "class".
 125  */
 126
 127 struct ipv6hdr {
 128 #if defined(__LITTLE_ENDIAN_BITFIELD)
 129         __u8                    priority:4,
 130                                 version:4;
 131 #elif defined(__BIG_ENDIAN_BITFIELD)
 132         __u8                    version:4,
 133                                 priority:4;
 134 #else
 135 #error  "Please fix <asm/byteorder.h>"
 136 #endif
 137         __u8                    flow_lbl[3];
 138
 139         __be16                  payload_len;
 140         __u8                    nexthdr;
 141         __u8                    hop_limit;
 142
 143         struct  in6_addr        saddr;
 144         struct  in6_addr        daddr;
 145 };
 146
 147 /*
 148  * This structure contains configuration options per IPv6 link.
 149  */
 150 struct ipv6_devconf {
 151         __s32           forwarding;
 152         __s32           hop_limit;
 153         __s32           mtu6;
 154         __s32           accept_ra;
 155         __s32           accept_redirects;
 156         __s32           autoconf;
 157         __s32           dad_transmits;
 158         __s32           rtr_solicits;
 159         __s32           rtr_solicit_interval;
 160         __s32           rtr_solicit_delay;
 161         __s32           force_mld_version;
 162 #ifdef CONFIG_IPV6_PRIVACY
 163         __s32           use_tempaddr;
 164         __s32           temp_valid_lft;
 165         __s32           temp_prefered_lft;
 166         __s32           regen_max_retry;
 167         __s32           max_desync_factor;
 168 #endif
 169         __s32           max_addresses;
 170         __s32           accept_ra_defrtr;
 171         __s32           accept_ra_pinfo;
 172 #ifdef CONFIG_IPV6_ROUTER_PREF
 173         __s32           accept_ra_rtr_pref;
 174         __s32           rtr_probe_interval;
 175 #ifdef CONFIG_IPV6_ROUTE_INFO
 176         __s32           accept_ra_rt_info_max_plen;
 177 #endif
 178 #endif
 179         __s32           proxy_ndp;
 180         __s32           accept_source_route;
 181 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 182         __s32           optimistic_dad;
 183 #endif
 184         void            *sysctl;
 185 };
 186
 187 /* index values for the variables in ipv6_devconf */
 188 enum {
 189         DEVCONF_FORWARDING = 0,
 190         DEVCONF_HOPLIMIT,
 191         DEVCONF_MTU6,
 192         DEVCONF_ACCEPT_RA,
 193         DEVCONF_ACCEPT_REDIRECTS,
 194         DEVCONF_AUTOCONF,
 195         DEVCONF_DAD_TRANSMITS,
 196         DEVCONF_RTR_SOLICITS,
 197         DEVCONF_RTR_SOLICIT_INTERVAL,
 198         DEVCONF_RTR_SOLICIT_DELAY,
 199         DEVCONF_USE_TEMPADDR,
 200         DEVCONF_TEMP_VALID_LFT,
 201         DEVCONF_TEMP_PREFERED_LFT,
 202         DEVCONF_REGEN_MAX_RETRY,
 203         DEVCONF_MAX_DESYNC_FACTOR,
 204         DEVCONF_MAX_ADDRESSES,
 205         DEVCONF_FORCE_MLD_VERSION,
 206         DEVCONF_ACCEPT_RA_DEFRTR,
 207         DEVCONF_ACCEPT_RA_PINFO,
 208         DEVCONF_ACCEPT_RA_RTR_PREF,
 209         DEVCONF_RTR_PROBE_INTERVAL,
 210         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 211         DEVCONF_PROXY_NDP,
 212         DEVCONF_OPTIMISTIC_DAD,
 213         DEVCONF_ACCEPT_SOURCE_ROUTE,
 214         DEVCONF_MAX
 215 };
 216
 217 #ifdef __KERNEL__
 218 #include <linux/icmpv6.h>
 219 #include <linux/tcp.h>
 220 #include <linux/udp.h>
 221
 222 #include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
 223 #include <net/inet_sock.h>
 224
 225 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 226 {
 227         return (struct ipv6hdr *)skb_network_header(skb);
 228 }
 229
 230 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 231 {
 232         return (struct ipv6hdr *)skb_transport_header(skb);
 233 }
 234
 235 /*
 236    This structure contains results of exthdrs parsing
 237    as offsets from skb->nh.
 238  */
 239
 240 struct inet6_skb_parm {
 241         int                     iif;
 242         __u16                   ra;
 243         __u16                   hop;
 244         __u16                   dst0;
 245         __u16                   srcrt;
 246         __u16                   dst1;
 247         __u16                   lastopt;
 248         __u32                   nhoff;
 249         __u16                   flags;
 250 #ifdef CONFIG_IPV6_MIP6
 251         __u16                   dsthao;
 252 #endif
 253
 254 #define IP6SKB_XFRM_TRANSFORMED 1
 255 };
 256
 257 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 258
 259 static inline int inet6_iif(const struct sk_buff *skb)
 260 {
 261         return IP6CB(skb)->iif;
 262 }
 263
 264 struct inet6_request_sock {
 265         struct in6_addr         loc_addr;
 266         struct in6_addr         rmt_addr;
 267         struct sk_buff          *pktopts;
 268         int                     iif;
 269 };
 270
 271 struct tcp6_request_sock {
 272         struct tcp_request_sock   tcp6rsk_tcp;
 273         struct inet6_request_sock tcp6rsk_inet6;
 274 };
 275
 276 /**
 277  * struct ipv6_pinfo - ipv6 private area
 278  *
 279  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 280  * this _must_ be the last member, so that inet6_sk_generic
 281  * is able to calculate its offset from the base struct sock
 282  * by using the struct proto->slab_obj_size member. -acme
 283  */
 284 struct ipv6_pinfo {
 285         struct in6_addr         saddr;
 286         struct in6_addr         rcv_saddr;
 287         struct in6_addr         daddr;
 288         struct in6_addr         *daddr_cache;
 289 #ifdef CONFIG_IPV6_SUBTREES
 290         struct in6_addr         *saddr_cache;
 291 #endif
 292
 293         __be32                  flow_label;
 294         __u32                   frag_size;
 295         __s16                   hop_limit;
 296         __s16                   mcast_hops;
 297         int                     mcast_oif;
 298
 299         /* pktoption flags */
 300         union {
 301                 struct {
 302                         __u16   srcrt:2,
 303                                 osrcrt:2,
 304                                 rxinfo:1,
 305                                 rxoinfo:1,
 306                                 rxhlim:1,
 307                                 rxohlim:1,
 308                                 hopopts:1,
 309                                 ohopopts:1,
 310                                 dstopts:1,
 311                                 odstopts:1,
 312                                 rxflow:1,
 313                                 rxtclass:1;
 314                 } bits;
 315                 __u16           all;
 316         } rxopt;
 317
 318         /* sockopt flags */
 319         __u8                    mc_loop:1,
 320                                 recverr:1,
 321                                 sndflow:1,
 322                                 pmtudisc:2,
 323                                 ipv6only:1;
 324         __u8                    tclass;
 325
 326         __u32                   dst_cookie;
 327
 328         struct ipv6_mc_socklist *ipv6_mc_list;
 329         struct ipv6_ac_socklist *ipv6_ac_list;
 330         struct ipv6_fl_socklist *ipv6_fl_list;
 331
 332         struct ipv6_txoptions   *opt;
 333         struct sk_buff          *pktoptions;
 334         struct {
 335                 struct ipv6_txoptions *opt;
 336                 struct rt6_info *rt;
 337                 int hop_limit;
 338                 int tclass;
 339         } cork;
 340 };
 341
 342 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 343 struct raw6_sock {
 344         /* inet_sock has to be the first member of raw6_sock */
 345         struct inet_sock        inet;
 346         __u32                   checksum;       /* perform checksum */
 347         __u32                   offset;         /* checksum offset  */
 348         struct icmp6_filter     filter;
 349         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 350         struct ipv6_pinfo       inet6;
 351 };
 352
 353 struct udp6_sock {
 354         struct udp_sock   udp;
 355         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 356         struct ipv6_pinfo inet6;
 357 };
 358
 359 struct tcp6_sock {
 360         struct tcp_sock   tcp;
 361         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 362         struct ipv6_pinfo inet6;
 363 };
 364
 365 extern int inet6_sk_rebuild_header(struct sock *sk);
 366
 367 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 368 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 369 {
 370         return inet_sk(__sk)->pinet6;
 371 }
 372
 373 static inline struct inet6_request_sock *
 374                         inet6_rsk(const struct request_sock *rsk)
 375 {
 376         return (struct inet6_request_sock *)(((u8 *)rsk) +
 377                                              inet_rsk(rsk)->inet6_rsk_offset);
 378 }
 379
 380 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 381 {
 382         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 383 }
 384
 385 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 386 {
 387         struct request_sock *req = reqsk_alloc(ops);
 388
 389         if (req != NULL)
 390                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 391
 392         return req;
 393 }
 394
 395 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 396 {
 397         return (struct raw6_sock *)sk;
 398 }
 399
 400 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 401                                            const struct sock *sk_from)
 402 {
 403         int ancestor_size = sizeof(struct inet_sock);
 404
 405         if (sk_from->sk_family == PF_INET6)
 406                 ancestor_size += sizeof(struct ipv6_pinfo);
 407
 408         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 409 }
 410
 411 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 412 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 413
 414 struct inet6_timewait_sock {
 415         struct in6_addr tw_v6_daddr;
 416         struct in6_addr tw_v6_rcv_saddr;
 417 };
 418
 419 struct tcp6_timewait_sock {
 420         struct tcp_timewait_sock   tcp6tw_tcp;
 421         struct inet6_timewait_sock tcp6tw_inet6;
 422 };
 423
 424 static inline u16 inet6_tw_offset(const struct proto *prot)
 425 {
 426         return prot->twsk_prot->twsk_obj_size -
 427                         sizeof(struct inet6_timewait_sock);
 428 }
 429
 430 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 431 {
 432         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 433                                               inet_twsk(sk)->tw_ipv6_offset);
 434 }
 435
 436 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 437 {
 438         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 439                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 440 }
 441
 442 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 443 {
 444         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 445 }
 446
 447 static inline int inet_v6_ipv6only(const struct sock *sk)
 448 {
 449         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 450                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 451 }
 452 #else
 453 #define __ipv6_only_sock(sk)    0
 454 #define ipv6_only_sock(sk)      0
 455
 456 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 457 {
 458         return NULL;
 459 }
 460
 461 static inline struct inet6_request_sock *
 462                         inet6_rsk(const struct request_sock *rsk)
 463 {
 464         return NULL;
 465 }
 466
 467 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 468 {
 469         return NULL;
 470 }
 471
 472 #define __inet6_rcv_saddr(__sk) NULL
 473 #define inet6_rcv_saddr(__sk)   NULL
 474 #define tcp_twsk_ipv6only(__sk)         0
 475 #define inet_v6_ipv6only(__sk)          0
 476 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 477
 478 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
 479         (((__sk)->sk_hash == (__hash))                          && \
 480          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
 481          ((__sk)->sk_family             == AF_INET6)            && \
 482          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 483          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 484          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 485
 486 #endif /* __KERNEL__ */
 487
 488 #endif /* _IPV6_H */