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         void            *sysctl;
 182 };
 183
 184 /* index values for the variables in ipv6_devconf */
 185 enum {
 186         DEVCONF_FORWARDING = 0,
 187         DEVCONF_HOPLIMIT,
 188         DEVCONF_MTU6,
 189         DEVCONF_ACCEPT_RA,
 190         DEVCONF_ACCEPT_REDIRECTS,
 191         DEVCONF_AUTOCONF,
 192         DEVCONF_DAD_TRANSMITS,
 193         DEVCONF_RTR_SOLICITS,
 194         DEVCONF_RTR_SOLICIT_INTERVAL,
 195         DEVCONF_RTR_SOLICIT_DELAY,
 196         DEVCONF_USE_TEMPADDR,
 197         DEVCONF_TEMP_VALID_LFT,
 198         DEVCONF_TEMP_PREFERED_LFT,
 199         DEVCONF_REGEN_MAX_RETRY,
 200         DEVCONF_MAX_DESYNC_FACTOR,
 201         DEVCONF_MAX_ADDRESSES,
 202         DEVCONF_FORCE_MLD_VERSION,
 203         DEVCONF_ACCEPT_RA_DEFRTR,
 204         DEVCONF_ACCEPT_RA_PINFO,
 205         DEVCONF_ACCEPT_RA_RTR_PREF,
 206         DEVCONF_RTR_PROBE_INTERVAL,
 207         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 208         DEVCONF_PROXY_NDP,
 209         __DEVCONF_OPTIMISTIC_DAD,
 210         DEVCONF_ACCEPT_SOURCE_ROUTE,
 211         DEVCONF_MAX
 212 };
 213
 214 #ifdef __KERNEL__
 215 #include <linux/icmpv6.h>
 216 #include <linux/tcp.h>
 217 #include <linux/udp.h>
 218
 219 #include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
 220 #include <net/inet_sock.h>
 221
 222 /*
 223    This structure contains results of exthdrs parsing
 224    as offsets from skb->nh.
 225  */
 226
 227 struct inet6_skb_parm {
 228         int                     iif;
 229         __u16                   ra;
 230         __u16                   hop;
 231         __u16                   dst0;
 232         __u16                   srcrt;
 233         __u16                   dst1;
 234         __u16                   lastopt;
 235         __u32                   nhoff;
 236         __u16                   flags;
 237 #ifdef CONFIG_IPV6_MIP6
 238         __u16                   dsthao;
 239 #endif
 240
 241 #define IP6SKB_XFRM_TRANSFORMED 1
 242 };
 243
 244 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 245
 246 static inline int inet6_iif(const struct sk_buff *skb)
 247 {
 248         return IP6CB(skb)->iif;
 249 }
 250
 251 struct inet6_request_sock {
 252         struct in6_addr         loc_addr;
 253         struct in6_addr         rmt_addr;
 254         struct sk_buff          *pktopts;
 255         int                     iif;
 256 };
 257
 258 struct tcp6_request_sock {
 259         struct tcp_request_sock   tcp6rsk_tcp;
 260         struct inet6_request_sock tcp6rsk_inet6;
 261 };
 262
 263 /**
 264  * struct ipv6_pinfo - ipv6 private area
 265  *
 266  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 267  * this _must_ be the last member, so that inet6_sk_generic
 268  * is able to calculate its offset from the base struct sock
 269  * by using the struct proto->slab_obj_size member. -acme
 270  */
 271 struct ipv6_pinfo {
 272         struct in6_addr         saddr;
 273         struct in6_addr         rcv_saddr;
 274         struct in6_addr         daddr;
 275         struct in6_addr         *daddr_cache;
 276 #ifdef CONFIG_IPV6_SUBTREES
 277         struct in6_addr         *saddr_cache;
 278 #endif
 279
 280         __be32                  flow_label;
 281         __u32                   frag_size;
 282         __s16                   hop_limit;
 283         __s16                   mcast_hops;
 284         int                     mcast_oif;
 285
 286         /* pktoption flags */
 287         union {
 288                 struct {
 289                         __u16   srcrt:2,
 290                                 osrcrt:2,
 291                                 rxinfo:1,
 292                                 rxoinfo:1,
 293                                 rxhlim:1,
 294                                 rxohlim:1,
 295                                 hopopts:1,
 296                                 ohopopts:1,
 297                                 dstopts:1,
 298                                 odstopts:1,
 299                                 rxflow:1,
 300                                 rxtclass:1;
 301                 } bits;
 302                 __u16           all;
 303         } rxopt;
 304
 305         /* sockopt flags */
 306         __u8                    mc_loop:1,
 307                                 recverr:1,
 308                                 sndflow:1,
 309                                 pmtudisc:2,
 310                                 ipv6only:1;
 311         __u8                    tclass;
 312
 313         __u32                   dst_cookie;
 314
 315         struct ipv6_mc_socklist *ipv6_mc_list;
 316         struct ipv6_ac_socklist *ipv6_ac_list;
 317         struct ipv6_fl_socklist *ipv6_fl_list;
 318
 319         struct ipv6_txoptions   *opt;
 320         struct sk_buff          *pktoptions;
 321         struct {
 322                 struct ipv6_txoptions *opt;
 323                 struct rt6_info *rt;
 324                 int hop_limit;
 325                 int tclass;
 326         } cork;
 327 };
 328
 329 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 330 struct raw6_sock {
 331         /* inet_sock has to be the first member of raw6_sock */
 332         struct inet_sock        inet;
 333         __u32                   checksum;       /* perform checksum */
 334         __u32                   offset;         /* checksum offset  */
 335         struct icmp6_filter     filter;
 336         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 337         struct ipv6_pinfo       inet6;
 338 };
 339
 340 struct udp6_sock {
 341         struct udp_sock   udp;
 342         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 343         struct ipv6_pinfo inet6;
 344 };
 345
 346 struct tcp6_sock {
 347         struct tcp_sock   tcp;
 348         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 349         struct ipv6_pinfo inet6;
 350 };
 351
 352 extern int inet6_sk_rebuild_header(struct sock *sk);
 353
 354 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 355 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 356 {
 357         return inet_sk(__sk)->pinet6;
 358 }
 359
 360 static inline struct inet6_request_sock *
 361                         inet6_rsk(const struct request_sock *rsk)
 362 {
 363         return (struct inet6_request_sock *)(((u8 *)rsk) +
 364                                              inet_rsk(rsk)->inet6_rsk_offset);
 365 }
 366
 367 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 368 {
 369         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 370 }
 371
 372 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 373 {
 374         struct request_sock *req = reqsk_alloc(ops);
 375
 376         if (req != NULL)
 377                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 378
 379         return req;
 380 }
 381
 382 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 383 {
 384         return (struct raw6_sock *)sk;
 385 }
 386
 387 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 388                                            const struct sock *sk_from)
 389 {
 390         int ancestor_size = sizeof(struct inet_sock);
 391
 392         if (sk_from->sk_family == PF_INET6)
 393                 ancestor_size += sizeof(struct ipv6_pinfo);
 394
 395         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 396 }
 397
 398 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 399 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 400
 401 struct inet6_timewait_sock {
 402         struct in6_addr tw_v6_daddr;
 403         struct in6_addr tw_v6_rcv_saddr;
 404 };
 405
 406 struct tcp6_timewait_sock {
 407         struct tcp_timewait_sock   tcp6tw_tcp;
 408         struct inet6_timewait_sock tcp6tw_inet6;
 409 };
 410
 411 static inline u16 inet6_tw_offset(const struct proto *prot)
 412 {
 413         return prot->twsk_prot->twsk_obj_size -
 414                         sizeof(struct inet6_timewait_sock);
 415 }
 416
 417 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 418 {
 419         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 420                                               inet_twsk(sk)->tw_ipv6_offset);
 421 }
 422
 423 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 424 {
 425         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 426                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 427 }
 428
 429 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 430 {
 431         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 432 }
 433
 434 static inline int inet_v6_ipv6only(const struct sock *sk)
 435 {
 436         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 437                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 438 }
 439 #else
 440 #define __ipv6_only_sock(sk)    0
 441 #define ipv6_only_sock(sk)      0
 442
 443 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 444 {
 445         return NULL;
 446 }
 447
 448 static inline struct inet6_request_sock *
 449                         inet6_rsk(const struct request_sock *rsk)
 450 {
 451         return NULL;
 452 }
 453
 454 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 455 {
 456         return NULL;
 457 }
 458
 459 #define __inet6_rcv_saddr(__sk) NULL
 460 #define inet6_rcv_saddr(__sk)   NULL
 461 #define tcp_twsk_ipv6only(__sk)         0
 462 #define inet_v6_ipv6only(__sk)          0
 463 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 464
 465 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
 466         (((__sk)->sk_hash == (__hash))                          && \
 467          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
 468          ((__sk)->sk_family             == AF_INET6)            && \
 469          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 470          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 471          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 472
 473 #endif /* __KERNEL__ */
 474
 475 #endif /* _IPV6_H */