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         void            *sysctl;
 149 };
 150
 151 /* index values for the variables in ipv6_devconf */
 152 enum {
 153         DEVCONF_FORWARDING = 0,
 154         DEVCONF_HOPLIMIT,
 155         DEVCONF_MTU6,
 156         DEVCONF_ACCEPT_RA,
 157         DEVCONF_ACCEPT_REDIRECTS,
 158         DEVCONF_AUTOCONF,
 159         DEVCONF_DAD_TRANSMITS,
 160         DEVCONF_RTR_SOLICITS,
 161         DEVCONF_RTR_SOLICIT_INTERVAL,
 162         DEVCONF_RTR_SOLICIT_DELAY,
 163         DEVCONF_USE_TEMPADDR,
 164         DEVCONF_TEMP_VALID_LFT,
 165         DEVCONF_TEMP_PREFERED_LFT,
 166         DEVCONF_REGEN_MAX_RETRY,
 167         DEVCONF_MAX_DESYNC_FACTOR,
 168         DEVCONF_MAX_ADDRESSES,
 169         DEVCONF_FORCE_MLD_VERSION,
 170         DEVCONF_MAX
 171 };
 172
 173 #ifdef __KERNEL__
 174 #include <linux/icmpv6.h>
 175 #include <linux/tcp.h>
 176 #include <linux/udp.h>
 177
 178 #include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
 179 #include <net/inet_sock.h>
 180
 181 /*
 182    This structure contains results of exthdrs parsing
 183    as offsets from skb->nh.
 184  */
 185
 186 struct inet6_skb_parm {
 187         int                     iif;
 188         __u16                   ra;
 189         __u16                   hop;
 190         __u16                   dst0;
 191         __u16                   srcrt;
 192         __u16                   dst1;
 193         __u16                   lastopt;
 194         __u32                   nhoff;
 195         __u16                   flags;
 196
 197 #define IP6SKB_XFRM_TRANSFORMED 1
 198 };
 199
 200 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 201
 202 static inline int inet6_iif(const struct sk_buff *skb)
 203 {
 204         return IP6CB(skb)->iif;
 205 }
 206
 207 struct inet6_request_sock {
 208         struct in6_addr         loc_addr;
 209         struct in6_addr         rmt_addr;
 210         struct sk_buff          *pktopts;
 211         int                     iif;
 212 };
 213
 214 struct tcp6_request_sock {
 215         struct tcp_request_sock   tcp6rsk_tcp;
 216         struct inet6_request_sock tcp6rsk_inet6;
 217 };
 218
 219 /**
 220  * struct ipv6_pinfo - ipv6 private area
 221  *
 222  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 223  * this _must_ be the last member, so that inet6_sk_generic
 224  * is able to calculate its offset from the base struct sock
 225  * by using the struct proto->slab_obj_size member. -acme
 226  */
 227 struct ipv6_pinfo {
 228         struct in6_addr         saddr;
 229         struct in6_addr         rcv_saddr;
 230         struct in6_addr         daddr;
 231         struct in6_addr         *daddr_cache;
 232
 233         __u32                   flow_label;
 234         __u32                   frag_size;
 235         __s16                   hop_limit;
 236         __s16                   mcast_hops;
 237         int                     mcast_oif;
 238
 239         /* pktoption flags */
 240         union {
 241                 struct {
 242                         __u16   srcrt:2,
 243                                 osrcrt:2,
 244                                 rxinfo:1,
 245                                 rxoinfo:1,
 246                                 rxhlim:1,
 247                                 rxohlim:1,
 248                                 hopopts:1,
 249                                 ohopopts:1,
 250                                 dstopts:1,
 251                                 odstopts:1,
 252                                 rxflow:1,
 253                                 rxtclass:1;
 254                 } bits;
 255                 __u16           all;
 256         } rxopt;
 257
 258         /* sockopt flags */
 259         __u8                    mc_loop:1,
 260                                 recverr:1,
 261                                 sndflow:1,
 262                                 pmtudisc:2,
 263                                 ipv6only:1;
 264         __u8                    tclass;
 265
 266         __u32                   dst_cookie;
 267
 268         struct ipv6_mc_socklist *ipv6_mc_list;
 269         struct ipv6_ac_socklist *ipv6_ac_list;
 270         struct ipv6_fl_socklist *ipv6_fl_list;
 271
 272         struct ipv6_txoptions   *opt;
 273         struct sk_buff          *pktoptions;
 274         struct {
 275                 struct ipv6_txoptions *opt;
 276                 struct rt6_info *rt;
 277                 int hop_limit;
 278                 int tclass;
 279         } cork;
 280 };
 281
 282 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 283 struct raw6_sock {
 284         /* inet_sock has to be the first member of raw6_sock */
 285         struct inet_sock        inet;
 286         __u32                   checksum;       /* perform checksum */
 287         __u32                   offset;         /* checksum offset  */
 288         struct icmp6_filter     filter;
 289         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 290         struct ipv6_pinfo       inet6;
 291 };
 292
 293 struct udp6_sock {
 294         struct udp_sock   udp;
 295         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 296         struct ipv6_pinfo inet6;
 297 };
 298
 299 struct tcp6_sock {
 300         struct tcp_sock   tcp;
 301         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 302         struct ipv6_pinfo inet6;
 303 };
 304
 305 extern int inet6_sk_rebuild_header(struct sock *sk);
 306
 307 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 308 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 309 {
 310         return inet_sk(__sk)->pinet6;
 311 }
 312
 313 static inline struct inet6_request_sock *
 314                         inet6_rsk(const struct request_sock *rsk)
 315 {
 316         return (struct inet6_request_sock *)(((u8 *)rsk) +
 317                                              inet_rsk(rsk)->inet6_rsk_offset);
 318 }
 319
 320 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 321 {
 322         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 323 }
 324
 325 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 326 {
 327         struct request_sock *req = reqsk_alloc(ops);
 328
 329         if (req != NULL)
 330                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 331
 332         return req;
 333 }
 334
 335 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 336 {
 337         return (struct raw6_sock *)sk;
 338 }
 339
 340 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 341                                            const struct sock *sk_from)
 342 {
 343         int ancestor_size = sizeof(struct inet_sock);
 344
 345         if (sk_from->sk_family == PF_INET6)
 346                 ancestor_size += sizeof(struct ipv6_pinfo);
 347
 348         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 349 }
 350
 351 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 352 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 353
 354 struct inet6_timewait_sock {
 355         struct in6_addr tw_v6_daddr;
 356         struct in6_addr tw_v6_rcv_saddr;
 357 };
 358
 359 struct tcp6_timewait_sock {
 360         struct tcp_timewait_sock   tcp6tw_tcp;
 361         struct inet6_timewait_sock tcp6tw_inet6;
 362 };
 363
 364 static inline u16 inet6_tw_offset(const struct proto *prot)
 365 {
 366         return prot->twsk_prot->twsk_obj_size -
 367                         sizeof(struct inet6_timewait_sock);
 368 }
 369
 370 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 371 {
 372         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 373                                               inet_twsk(sk)->tw_ipv6_offset);
 374 }
 375
 376 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 377 {
 378         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 379                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 380 }
 381
 382 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 383 {
 384         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 385 }
 386
 387 static inline int inet_v6_ipv6only(const struct sock *sk)
 388 {
 389         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 390                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 391 }
 392 #else
 393 #define __ipv6_only_sock(sk)    0
 394 #define ipv6_only_sock(sk)      0
 395
 396 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 397 {
 398         return NULL;
 399 }
 400
 401 static inline struct inet6_request_sock *
 402                         inet6_rsk(const struct request_sock *rsk)
 403 {
 404         return NULL;
 405 }
 406
 407 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 408 {
 409         return NULL;
 410 }
 411
 412 #define __inet6_rcv_saddr(__sk) NULL
 413 #define inet6_rcv_saddr(__sk)   NULL
 414 #define tcp_twsk_ipv6only(__sk)         0
 415 #define inet_v6_ipv6only(__sk)          0
 416 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 417
 418 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
 419         (((__sk)->sk_hash == (__hash))                          && \
 420          ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports))   && \
 421          ((__sk)->sk_family             == AF_INET6)            && \
 422          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 423          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 424          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 425
 426 #endif /* __KERNEL__ */
 427
 428 #endif /* _IPV6_H */