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