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         void            *sysctl;
 151 };
 152
 153 /* index values for the variables in ipv6_devconf */
 154 enum {
 155         DEVCONF_FORWARDING = 0,
 156         DEVCONF_HOPLIMIT,
 157         DEVCONF_MTU6,
 158         DEVCONF_ACCEPT_RA,
 159         DEVCONF_ACCEPT_REDIRECTS,
 160         DEVCONF_AUTOCONF,
 161         DEVCONF_DAD_TRANSMITS,
 162         DEVCONF_RTR_SOLICITS,
 163         DEVCONF_RTR_SOLICIT_INTERVAL,
 164         DEVCONF_RTR_SOLICIT_DELAY,
 165         DEVCONF_USE_TEMPADDR,
 166         DEVCONF_TEMP_VALID_LFT,
 167         DEVCONF_TEMP_PREFERED_LFT,
 168         DEVCONF_REGEN_MAX_RETRY,
 169         DEVCONF_MAX_DESYNC_FACTOR,
 170         DEVCONF_MAX_ADDRESSES,
 171         DEVCONF_FORCE_MLD_VERSION,
 172         DEVCONF_ACCEPT_RA_DEFRTR,
 173         DEVCONF_ACCEPT_RA_PINFO,
 174         DEVCONF_MAX
 175 };
 176
 177 #ifdef __KERNEL__
 178 #include <linux/icmpv6.h>
 179 #include <linux/tcp.h>
 180 #include <linux/udp.h>
 181
 182 #include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
 183 #include <net/inet_sock.h>
 184
 185 /*
 186    This structure contains results of exthdrs parsing
 187    as offsets from skb->nh.
 188  */
 189
 190 struct inet6_skb_parm {
 191         int                     iif;
 192         __u16                   ra;
 193         __u16                   hop;
 194         __u16                   dst0;
 195         __u16                   srcrt;
 196         __u16                   dst1;
 197         __u16                   lastopt;
 198         __u32                   nhoff;
 199         __u16                   flags;
 200
 201 #define IP6SKB_XFRM_TRANSFORMED 1
 202 };
 203
 204 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 205
 206 static inline int inet6_iif(const struct sk_buff *skb)
 207 {
 208         return IP6CB(skb)->iif;
 209 }
 210
 211 struct inet6_request_sock {
 212         struct in6_addr         loc_addr;
 213         struct in6_addr         rmt_addr;
 214         struct sk_buff          *pktopts;
 215         int                     iif;
 216 };
 217
 218 struct tcp6_request_sock {
 219         struct tcp_request_sock   tcp6rsk_tcp;
 220         struct inet6_request_sock tcp6rsk_inet6;
 221 };
 222
 223 /**
 224  * struct ipv6_pinfo - ipv6 private area
 225  *
 226  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 227  * this _must_ be the last member, so that inet6_sk_generic
 228  * is able to calculate its offset from the base struct sock
 229  * by using the struct proto->slab_obj_size member. -acme
 230  */
 231 struct ipv6_pinfo {
 232         struct in6_addr         saddr;
 233         struct in6_addr         rcv_saddr;
 234         struct in6_addr         daddr;
 235         struct in6_addr         *daddr_cache;
 236
 237         __u32                   flow_label;
 238         __u32                   frag_size;
 239         __s16                   hop_limit;
 240         __s16                   mcast_hops;
 241         int                     mcast_oif;
 242
 243         /* pktoption flags */
 244         union {
 245                 struct {
 246                         __u16   srcrt:2,
 247                                 osrcrt:2,
 248                                 rxinfo:1,
 249                                 rxoinfo:1,
 250                                 rxhlim:1,
 251                                 rxohlim:1,
 252                                 hopopts:1,
 253                                 ohopopts:1,
 254                                 dstopts:1,
 255                                 odstopts:1,
 256                                 rxflow:1,
 257                                 rxtclass:1;
 258                 } bits;
 259                 __u16           all;
 260         } rxopt;
 261
 262         /* sockopt flags */
 263         __u8                    mc_loop:1,
 264                                 recverr:1,
 265                                 sndflow:1,
 266                                 pmtudisc:2,
 267                                 ipv6only:1;
 268         __u8                    tclass;
 269
 270         __u32                   dst_cookie;
 271
 272         struct ipv6_mc_socklist *ipv6_mc_list;
 273         struct ipv6_ac_socklist *ipv6_ac_list;
 274         struct ipv6_fl_socklist *ipv6_fl_list;
 275
 276         struct ipv6_txoptions   *opt;
 277         struct sk_buff          *pktoptions;
 278         struct {
 279                 struct ipv6_txoptions *opt;
 280                 struct rt6_info *rt;
 281                 int hop_limit;
 282                 int tclass;
 283         } cork;
 284 };
 285
 286 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 287 struct raw6_sock {
 288         /* inet_sock has to be the first member of raw6_sock */
 289         struct inet_sock        inet;
 290         __u32                   checksum;       /* perform checksum */
 291         __u32                   offset;         /* checksum offset  */
 292         struct icmp6_filter     filter;
 293         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 294         struct ipv6_pinfo       inet6;
 295 };
 296
 297 struct udp6_sock {
 298         struct udp_sock   udp;
 299         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 300         struct ipv6_pinfo inet6;
 301 };
 302
 303 struct tcp6_sock {
 304         struct tcp_sock   tcp;
 305         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 306         struct ipv6_pinfo inet6;
 307 };
 308
 309 extern int inet6_sk_rebuild_header(struct sock *sk);
 310
 311 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 312 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 313 {
 314         return inet_sk(__sk)->pinet6;
 315 }
 316
 317 static inline struct inet6_request_sock *
 318                         inet6_rsk(const struct request_sock *rsk)
 319 {
 320         return (struct inet6_request_sock *)(((u8 *)rsk) +
 321                                              inet_rsk(rsk)->inet6_rsk_offset);
 322 }
 323
 324 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 325 {
 326         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 327 }
 328
 329 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 330 {
 331         struct request_sock *req = reqsk_alloc(ops);
 332
 333         if (req != NULL)
 334                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 335
 336         return req;
 337 }
 338
 339 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 340 {
 341         return (struct raw6_sock *)sk;
 342 }
 343
 344 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 345                                            const struct sock *sk_from)
 346 {
 347         int ancestor_size = sizeof(struct inet_sock);
 348
 349         if (sk_from->sk_family == PF_INET6)
 350                 ancestor_size += sizeof(struct ipv6_pinfo);
 351
 352         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 353 }
 354
 355 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 356 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 357
 358 struct inet6_timewait_sock {
 359         struct in6_addr tw_v6_daddr;
 360         struct in6_addr tw_v6_rcv_saddr;
 361 };
 362
 363 struct tcp6_timewait_sock {
 364         struct tcp_timewait_sock   tcp6tw_tcp;
 365         struct inet6_timewait_sock tcp6tw_inet6;
 366 };
 367
 368 static inline u16 inet6_tw_offset(const struct proto *prot)
 369 {
 370         return prot->twsk_prot->twsk_obj_size -
 371                         sizeof(struct inet6_timewait_sock);
 372 }
 373
 374 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 375 {
 376         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 377                                               inet_twsk(sk)->tw_ipv6_offset);
 378 }
 379
 380 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 381 {
 382         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 383                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 384 }
 385
 386 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 387 {
 388         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 389 }
 390
 391 static inline int inet_v6_ipv6only(const struct sock *sk)
 392 {
 393         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 394                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 395 }
 396 #else
 397 #define __ipv6_only_sock(sk)    0
 398 #define ipv6_only_sock(sk)      0
 399
 400 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 401 {
 402         return NULL;
 403 }
 404
 405 static inline struct inet6_request_sock *
 406                         inet6_rsk(const struct request_sock *rsk)
 407 {
 408         return NULL;
 409 }
 410
 411 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 412 {
 413         return NULL;
 414 }
 415
 416 #define __inet6_rcv_saddr(__sk) NULL
 417 #define inet6_rcv_saddr(__sk)   NULL
 418 #define tcp_twsk_ipv6only(__sk)         0
 419 #define inet_v6_ipv6only(__sk)          0
 420 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 421
 422 #define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
 423         (((__sk)->sk_hash == (__hash))                          && \
 424          ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports))   && \
 425          ((__sk)->sk_family             == AF_INET6)            && \
 426          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 427          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 428          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 429
 430 #endif /* __KERNEL__ */
 431
 432 #endif /* _IPV6_H */