include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <linux/config.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    /* this hop must be a neighbor  */
  32 #define IPV6_SRCRT_TYPE_0       0       /* IPv6 type 0 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 struct ipv6_auth_hdr {
  78         __u8  nexthdr;
  79         __u8  hdrlen;           /* This one is measured in 32 bit units! */
  80         __u16 reserved;
  81         __u32 spi;
  82         __u32 seq_no;           /* Sequence number */
  83         __u8  auth_data[0];     /* Length variable but >=4. Mind the 64 bit alignment! */
  84 };
  85
  86 struct ipv6_esp_hdr {
  87         __u32 spi;
  88         __u32 seq_no;           /* Sequence number */
  89         __u8  enc_data[0];      /* Length variable but >=8. Mind the 64 bit alignment! */
  90 };
  91
  92 struct ipv6_comp_hdr {
  93         __u8 nexthdr;
  94         __u8 flags;
  95         __u16 cpi;
  96 };
  97
  98 /*
  99  *      IPv6 fixed header
 100  *
 101  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 102  *      are glued to priority now, forming "class".
 103  */
 104
 105 struct ipv6hdr {
 106 #if defined(__LITTLE_ENDIAN_BITFIELD)
 107         __u8                    priority:4,
 108                                 version:4;
 109 #elif defined(__BIG_ENDIAN_BITFIELD)
 110         __u8                    version:4,
 111                                 priority:4;
 112 #else
 113 #error  "Please fix <asm/byteorder.h>"
 114 #endif
 115         __u8                    flow_lbl[3];
 116
 117         __u16                   payload_len;
 118         __u8                    nexthdr;
 119         __u8                    hop_limit;
 120
 121         struct  in6_addr        saddr;
 122         struct  in6_addr        daddr;
 123 };
 124
 125 /*
 126  * This structure contains configuration options per IPv6 link.
 127  */
 128 struct ipv6_devconf {
 129         __s32           forwarding;
 130         __s32           hop_limit;
 131         __s32           mtu6;
 132         __s32           accept_ra;
 133         __s32           accept_redirects;
 134         __s32           autoconf;
 135         __s32           dad_transmits;
 136         __s32           rtr_solicits;
 137         __s32           rtr_solicit_interval;
 138         __s32           rtr_solicit_delay;
 139         __s32           force_mld_version;
 140 #ifdef CONFIG_IPV6_PRIVACY
 141         __s32           use_tempaddr;
 142         __s32           temp_valid_lft;
 143         __s32           temp_prefered_lft;
 144         __s32           regen_max_retry;
 145         __s32           max_desync_factor;
 146 #endif
 147         __s32           max_addresses;
 148         __s32           accept_ra_defrtr;
 149         __s32           accept_ra_pinfo;
 150 #ifdef CONFIG_IPV6_ROUTER_PREF
 151         __s32           accept_ra_rtr_pref;
 152         __s32           rtr_probe_interval;
 153 #ifdef CONFIG_IPV6_ROUTE_INFO
 154         __s32           accept_ra_rt_info_max_plen;
 155 #endif
 156 #endif
 157         void            *sysctl;
 158 };
 159
 160 /* index values for the variables in ipv6_devconf */
 161 enum {
 162         DEVCONF_FORWARDING = 0,
 163         DEVCONF_HOPLIMIT,
 164         DEVCONF_MTU6,
 165         DEVCONF_ACCEPT_RA,
 166         DEVCONF_ACCEPT_REDIRECTS,
 167         DEVCONF_AUTOCONF,
 168         DEVCONF_DAD_TRANSMITS,
 169         DEVCONF_RTR_SOLICITS,
 170         DEVCONF_RTR_SOLICIT_INTERVAL,
 171         DEVCONF_RTR_SOLICIT_DELAY,
 172         DEVCONF_USE_TEMPADDR,
 173         DEVCONF_TEMP_VALID_LFT,
 174         DEVCONF_TEMP_PREFERED_LFT,
 175         DEVCONF_REGEN_MAX_RETRY,
 176         DEVCONF_MAX_DESYNC_FACTOR,
 177         DEVCONF_MAX_ADDRESSES,
 178         DEVCONF_FORCE_MLD_VERSION,
 179         DEVCONF_ACCEPT_RA_DEFRTR,
 180         DEVCONF_ACCEPT_RA_PINFO,
 181         DEVCONF_ACCEPT_RA_RTR_PREF,
 182         DEVCONF_RTR_PROBE_INTERVAL,
 183         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 184         DEVCONF_MAX
 185 };
 186
 187 #ifdef __KERNEL__
 188 #include <linux/icmpv6.h>
 189 #include <linux/tcp.h>
 190 #include <linux/udp.h>
 191
 192 #include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
 193 #include <net/inet_sock.h>
 194
 195 /*
 196    This structure contains results of exthdrs parsing
 197    as offsets from skb->nh.
 198  */
 199
 200 struct inet6_skb_parm {
 201         int                     iif;
 202         __u16                   ra;
 203         __u16                   hop;
 204         __u16                   dst0;
 205         __u16                   srcrt;
 206         __u16                   dst1;
 207         __u16                   lastopt;
 208         __u32                   nhoff;
 209         __u16                   flags;
 210
 211 #define IP6SKB_XFRM_TRANSFORMED 1
 212 };
 213
 214 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 215
 216 static inline int inet6_iif(const struct sk_buff *skb)
 217 {
 218         return IP6CB(skb)->iif;
 219 }
 220
 221 struct inet6_request_sock {
 222         struct in6_addr         loc_addr;
 223         struct in6_addr         rmt_addr;
 224         struct sk_buff          *pktopts;
 225         int                     iif;
 226 };
 227
 228 struct tcp6_request_sock {
 229         struct tcp_request_sock   tcp6rsk_tcp;
 230         struct inet6_request_sock tcp6rsk_inet6;
 231 };
 232
 233 /**
 234  * struct ipv6_pinfo - ipv6 private area
 235  *
 236  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 237  * this _must_ be the last member, so that inet6_sk_generic
 238  * is able to calculate its offset from the base struct sock
 239  * by using the struct proto->slab_obj_size member. -acme
 240  */
 241 struct ipv6_pinfo {
 242         struct in6_addr         saddr;
 243         struct in6_addr         rcv_saddr;
 244         struct in6_addr         daddr;
 245         struct in6_addr         *daddr_cache;
 246
 247         __u32                   flow_label;
 248         __u32                   frag_size;
 249         __s16                   hop_limit;
 250         __s16                   mcast_hops;
 251         int                     mcast_oif;
 252
 253         /* pktoption flags */
 254         union {
 255                 struct {
 256                         __u16   srcrt:2,
 257                                 osrcrt:2,
 258                                 rxinfo:1,
 259                                 rxoinfo:1,
 260                                 rxhlim:1,
 261                                 rxohlim:1,
 262                                 hopopts:1,
 263                                 ohopopts:1,
 264                                 dstopts:1,
 265                                 odstopts:1,
 266                                 rxflow:1,
 267                                 rxtclass:1;
 268                 } bits;
 269                 __u16           all;
 270         } rxopt;
 271
 272         /* sockopt flags */
 273         __u8                    mc_loop:1,
 274                                 recverr:1,
 275                                 sndflow:1,
 276                                 pmtudisc:2,
 277                                 ipv6only:1;
 278         __u8                    tclass;
 279
 280         __u32                   dst_cookie;
 281
 282         struct ipv6_mc_socklist *ipv6_mc_list;
 283         struct ipv6_ac_socklist *ipv6_ac_list;
 284         struct ipv6_fl_socklist *ipv6_fl_list;
 285
 286         struct ipv6_txoptions   *opt;
 287         struct sk_buff          *pktoptions;
 288         struct {
 289                 struct ipv6_txoptions *opt;
 290                 struct rt6_info *rt;
 291                 int hop_limit;
 292                 int tclass;
 293         } cork;
 294 };
 295
 296 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 297 struct raw6_sock {
 298         /* inet_sock has to be the first member of raw6_sock */
 299         struct inet_sock        inet;
 300         __u32                   checksum;       /* perform checksum */
 301         __u32                   offset;         /* checksum offset  */
 302         struct icmp6_filter     filter;
 303         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 304         struct ipv6_pinfo       inet6;
 305 };
 306
 307 struct udp6_sock {
 308         struct udp_sock   udp;
 309         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 310         struct ipv6_pinfo inet6;
 311 };
 312
 313 struct tcp6_sock {
 314         struct tcp_sock   tcp;
 315         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 316         struct ipv6_pinfo inet6;
 317 };
 318
 319 extern int inet6_sk_rebuild_header(struct sock *sk);
 320
 321 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 322 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 323 {
 324         return inet_sk(__sk)->pinet6;
 325 }
 326
 327 static inline struct inet6_request_sock *
 328                         inet6_rsk(const struct request_sock *rsk)
 329 {
 330         return (struct inet6_request_sock *)(((u8 *)rsk) +
 331                                              inet_rsk(rsk)->inet6_rsk_offset);
 332 }
 333
 334 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 335 {
 336         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 337 }
 338
 339 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 340 {
 341         struct request_sock *req = reqsk_alloc(ops);
 342
 343         if (req != NULL)
 344                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 345
 346         return req;
 347 }
 348
 349 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 350 {
 351         return (struct raw6_sock *)sk;
 352 }
 353
 354 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 355                                            const struct sock *sk_from)
 356 {
 357         int ancestor_size = sizeof(struct inet_sock);
 358
 359         if (sk_from->sk_family == PF_INET6)
 360                 ancestor_size += sizeof(struct ipv6_pinfo);
 361
 362         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 363 }
 364
 365 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 366 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 367
 368 struct inet6_timewait_sock {
 369         struct in6_addr tw_v6_daddr;
 370         struct in6_addr tw_v6_rcv_saddr;
 371 };
 372
 373 struct tcp6_timewait_sock {
 374         struct tcp_timewait_sock   tcp6tw_tcp;
 375         struct inet6_timewait_sock tcp6tw_inet6;
 376 };
 377
 378 static inline u16 inet6_tw_offset(const struct proto *prot)
 379 {
 380         return prot->twsk_prot->twsk_obj_size -
 381                         sizeof(struct inet6_timewait_sock);
 382 }
 383
 384 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 385 {
 386         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 387                                               inet_twsk(sk)->tw_ipv6_offset);
 388 }
 389
 390 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 391 {
 392         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 393                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 394 }
 395
 396 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 397 {
 398         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 399 }
 400
 401 static inline int inet_v6_ipv6only(const struct sock *sk)
 402 {
 403         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 404                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 405 }
 406 #else
 407 #define __ipv6_only_sock(sk)    0
 408 #define ipv6_only_sock(sk)      0
 409
 410 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 411 {
 412         return NULL;
 413 }
 414
 415 static inline struct inet6_request_sock *
 416                         inet6_rsk(const struct request_sock *rsk)
 417 {
 418         return NULL;
 419 }
 420
 421 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 422 {
 423         return NULL;
 424 }
 425
 426 #define __inet6_rcv_saddr(__sk) NULL
 427 #define inet6_rcv_saddr(__sk)   NULL
 428 #define tcp_twsk_ipv6only(__sk)         0
 429 #define inet_v6_ipv6only(__sk)          0
 430 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 431
 432 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
 433         (((__sk)->sk_hash == (__hash))                          && \
 434          ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports))   && \
 435          ((__sk)->sk_family             == AF_INET6)            && \
 436          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 437          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 438          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 439
 440 #endif /* __KERNEL__ */
 441
 442 #endif /* _IPV6_H */