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    /* Deprecated; will be removed */
  31 #define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
  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 } __attribute__ ((packed));     /* required for some archs */
  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 /*
 100  *      IPv6 fixed header
 101  *
 102  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 103  *      are glued to priority now, forming "class".
 104  */
 105
 106 struct ipv6hdr {
 107 #if defined(__LITTLE_ENDIAN_BITFIELD)
 108         __u8                    priority:4,
 109                                 version:4;
 110 #elif defined(__BIG_ENDIAN_BITFIELD)
 111         __u8                    version:4,
 112                                 priority:4;
 113 #else
 114 #error  "Please fix <asm/byteorder.h>"
 115 #endif
 116         __u8                    flow_lbl[3];
 117
 118         __be16                  payload_len;
 119         __u8                    nexthdr;
 120         __u8                    hop_limit;
 121
 122         struct  in6_addr        saddr;
 123         struct  in6_addr        daddr;
 124 };
 125
 126 /*
 127  * This structure contains configuration options per IPv6 link.
 128  */
 129 struct ipv6_devconf {
 130         __s32           forwarding;
 131         __s32           hop_limit;
 132         __s32           mtu6;
 133         __s32           accept_ra;
 134         __s32           accept_redirects;
 135         __s32           autoconf;
 136         __s32           dad_transmits;
 137         __s32           rtr_solicits;
 138         __s32           rtr_solicit_interval;
 139         __s32           rtr_solicit_delay;
 140         __s32           force_mld_version;
 141 #ifdef CONFIG_IPV6_PRIVACY
 142         __s32           use_tempaddr;
 143         __s32           temp_valid_lft;
 144         __s32           temp_prefered_lft;
 145         __s32           regen_max_retry;
 146         __s32           max_desync_factor;
 147 #endif
 148         __s32           max_addresses;
 149         __s32           accept_ra_defrtr;
 150         __s32           accept_ra_pinfo;
 151 #ifdef CONFIG_IPV6_ROUTER_PREF
 152         __s32           accept_ra_rtr_pref;
 153         __s32           rtr_probe_interval;
 154 #ifdef CONFIG_IPV6_ROUTE_INFO
 155         __s32           accept_ra_rt_info_max_plen;
 156 #endif
 157 #endif
 158         __s32           proxy_ndp;
 159         __s32           accept_source_route;
 160 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 161         __s32           optimistic_dad;
 162 #endif
 163 #ifdef CONFIG_IPV6_MROUTE
 164         __s32           mc_forwarding;
 165 #endif
 166         void            *sysctl;
 167 };
 168
 169 /* index values for the variables in ipv6_devconf */
 170 enum {
 171         DEVCONF_FORWARDING = 0,
 172         DEVCONF_HOPLIMIT,
 173         DEVCONF_MTU6,
 174         DEVCONF_ACCEPT_RA,
 175         DEVCONF_ACCEPT_REDIRECTS,
 176         DEVCONF_AUTOCONF,
 177         DEVCONF_DAD_TRANSMITS,
 178         DEVCONF_RTR_SOLICITS,
 179         DEVCONF_RTR_SOLICIT_INTERVAL,
 180         DEVCONF_RTR_SOLICIT_DELAY,
 181         DEVCONF_USE_TEMPADDR,
 182         DEVCONF_TEMP_VALID_LFT,
 183         DEVCONF_TEMP_PREFERED_LFT,
 184         DEVCONF_REGEN_MAX_RETRY,
 185         DEVCONF_MAX_DESYNC_FACTOR,
 186         DEVCONF_MAX_ADDRESSES,
 187         DEVCONF_FORCE_MLD_VERSION,
 188         DEVCONF_ACCEPT_RA_DEFRTR,
 189         DEVCONF_ACCEPT_RA_PINFO,
 190         DEVCONF_ACCEPT_RA_RTR_PREF,
 191         DEVCONF_RTR_PROBE_INTERVAL,
 192         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 193         DEVCONF_PROXY_NDP,
 194         DEVCONF_OPTIMISTIC_DAD,
 195         DEVCONF_ACCEPT_SOURCE_ROUTE,
 196         DEVCONF_MC_FORWARDING,
 197         DEVCONF_MAX
 198 };
 199
 200 #ifdef __KERNEL__
 201 #include <linux/icmpv6.h>
 202 #include <linux/tcp.h>
 203 #include <linux/udp.h>
 204
 205 #include <net/inet_sock.h>
 206
 207 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 208 {
 209         return (struct ipv6hdr *)skb_network_header(skb);
 210 }
 211
 212 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 213 {
 214         return (struct ipv6hdr *)skb_transport_header(skb);
 215 }
 216
 217 /*
 218    This structure contains results of exthdrs parsing
 219    as offsets from skb->nh.
 220  */
 221
 222 struct inet6_skb_parm {
 223         int                     iif;
 224         __u16                   ra;
 225         __u16                   hop;
 226         __u16                   dst0;
 227         __u16                   srcrt;
 228         __u16                   dst1;
 229         __u16                   lastopt;
 230         __u32                   nhoff;
 231         __u16                   flags;
 232 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 233         __u16                   dsthao;
 234 #endif
 235
 236 #define IP6SKB_XFRM_TRANSFORMED 1
 237 #define IP6SKB_FORWARDED        2
 238 };
 239
 240 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 241
 242 static inline int inet6_iif(const struct sk_buff *skb)
 243 {
 244         return IP6CB(skb)->iif;
 245 }
 246
 247 struct inet6_request_sock {
 248         struct in6_addr         loc_addr;
 249         struct in6_addr         rmt_addr;
 250         struct sk_buff          *pktopts;
 251         int                     iif;
 252 };
 253
 254 struct tcp6_request_sock {
 255         struct tcp_request_sock   tcp6rsk_tcp;
 256         struct inet6_request_sock tcp6rsk_inet6;
 257 };
 258
 259 struct ipv6_mc_socklist;
 260 struct ipv6_ac_socklist;
 261 struct ipv6_fl_socklist;
 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
 283         /*
 284          * Packed in 16bits.
 285          * Omit one shift by by putting the signed field at MSB.
 286          */
 287 #if defined(__BIG_ENDIAN_BITFIELD)
 288         __s16                   hop_limit:9;
 289         __u16                   __unused_1:7;
 290 #else
 291         __u16                   __unused_1:7;
 292         __s16                   hop_limit:9;
 293 #endif
 294
 295 #if defined(__BIG_ENDIAN_BITFIELD)
 296         /* Packed in 16bits. */
 297         __s16                   mcast_hops:9;
 298         __u16                   __unused_2:6,
 299                                 mc_loop:1;
 300 #else
 301         __u16                   mc_loop:1,
 302                                 __unused_2:6;
 303         __s16                   mcast_hops:9;
 304 #endif
 305         int                     mcast_oif;
 306
 307         /* pktoption flags */
 308         union {
 309                 struct {
 310                         __u16   srcrt:1,
 311                                 osrcrt:1,
 312                                 rxinfo:1,
 313                                 rxoinfo:1,
 314                                 rxhlim:1,
 315                                 rxohlim:1,
 316                                 hopopts:1,
 317                                 ohopopts:1,
 318                                 dstopts:1,
 319                                 odstopts:1,
 320                                 rxflow:1,
 321                                 rxtclass:1;
 322                 } bits;
 323                 __u16           all;
 324         } rxopt;
 325
 326         /* sockopt flags */
 327         __u8                    recverr:1,
 328                                 sndflow:1,
 329                                 pmtudisc:2,
 330                                 ipv6only:1,
 331                                 srcprefs:3;     /* 001: prefer temporary address
 332                                                  * 010: prefer public address
 333                                                  * 100: prefer care-of address
 334                                                  */
 335         __u8                    tclass;
 336
 337         __u32                   dst_cookie;
 338
 339         struct ipv6_mc_socklist *ipv6_mc_list;
 340         struct ipv6_ac_socklist *ipv6_ac_list;
 341         struct ipv6_fl_socklist *ipv6_fl_list;
 342
 343         struct ipv6_txoptions   *opt;
 344         struct sk_buff          *pktoptions;
 345         struct {
 346                 struct ipv6_txoptions *opt;
 347                 u8 hop_limit;
 348                 u8 tclass;
 349         } cork;
 350 };
 351
 352 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 353 struct raw6_sock {
 354         /* inet_sock has to be the first member of raw6_sock */
 355         struct inet_sock        inet;
 356         __u32                   checksum;       /* perform checksum */
 357         __u32                   offset;         /* checksum offset  */
 358         struct icmp6_filter     filter;
 359         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 360         struct ipv6_pinfo       inet6;
 361 };
 362
 363 struct udp6_sock {
 364         struct udp_sock   udp;
 365         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 366         struct ipv6_pinfo inet6;
 367 };
 368
 369 struct tcp6_sock {
 370         struct tcp_sock   tcp;
 371         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 372         struct ipv6_pinfo inet6;
 373 };
 374
 375 extern int inet6_sk_rebuild_header(struct sock *sk);
 376
 377 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 378 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 379 {
 380         return inet_sk(__sk)->pinet6;
 381 }
 382
 383 static inline struct inet6_request_sock *
 384                         inet6_rsk(const struct request_sock *rsk)
 385 {
 386         return (struct inet6_request_sock *)(((u8 *)rsk) +
 387                                              inet_rsk(rsk)->inet6_rsk_offset);
 388 }
 389
 390 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 391 {
 392         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 393 }
 394
 395 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 396 {
 397         struct request_sock *req = reqsk_alloc(ops);
 398
 399         if (req != NULL) {
 400                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 401                 inet6_rsk(req)->pktopts = NULL;
 402         }
 403
 404         return req;
 405 }
 406
 407 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 408 {
 409         return (struct raw6_sock *)sk;
 410 }
 411
 412 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 413                                            const struct sock *sk_from)
 414 {
 415         int ancestor_size = sizeof(struct inet_sock);
 416
 417         if (sk_from->sk_family == PF_INET6)
 418                 ancestor_size += sizeof(struct ipv6_pinfo);
 419
 420         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 421 }
 422
 423 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 424 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 425
 426 struct inet6_timewait_sock {
 427         struct in6_addr tw_v6_daddr;
 428         struct in6_addr tw_v6_rcv_saddr;
 429 };
 430
 431 struct tcp6_timewait_sock {
 432         struct tcp_timewait_sock   tcp6tw_tcp;
 433         struct inet6_timewait_sock tcp6tw_inet6;
 434 };
 435
 436 static inline u16 inet6_tw_offset(const struct proto *prot)
 437 {
 438         return prot->twsk_prot->twsk_obj_size -
 439                         sizeof(struct inet6_timewait_sock);
 440 }
 441
 442 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 443 {
 444         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 445                                               inet_twsk(sk)->tw_ipv6_offset);
 446 }
 447
 448 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 449 {
 450         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 451                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 452 }
 453
 454 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 455 {
 456         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 457 }
 458
 459 static inline int inet_v6_ipv6only(const struct sock *sk)
 460 {
 461         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 462                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 463 }
 464 #else
 465 #define __ipv6_only_sock(sk)    0
 466 #define ipv6_only_sock(sk)      0
 467
 468 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 469 {
 470         return NULL;
 471 }
 472
 473 static inline struct inet6_request_sock *
 474                         inet6_rsk(const struct request_sock *rsk)
 475 {
 476         return NULL;
 477 }
 478
 479 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 480 {
 481         return NULL;
 482 }
 483
 484 #define __inet6_rcv_saddr(__sk) NULL
 485 #define inet6_rcv_saddr(__sk)   NULL
 486 #define tcp_twsk_ipv6only(__sk)         0
 487 #define inet_v6_ipv6only(__sk)          0
 488 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 489
 490 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 491         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 492          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
 493          ((__sk)->sk_family             == AF_INET6)            && \
 494          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 495          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 496          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 497
 498 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
 499         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 500          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
 501          ((__sk)->sk_family            == PF_INET6)                     && \
 502          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
 503          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
 504          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 505
 506 #endif /* __KERNEL__ */
 507
 508 #endif /* _IPV6_H */