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         __s32           disable_ipv6;
 167         void            *sysctl;
 168 };
 169
 170 /* index values for the variables in ipv6_devconf */
 171 enum {
 172         DEVCONF_FORWARDING = 0,
 173         DEVCONF_HOPLIMIT,
 174         DEVCONF_MTU6,
 175         DEVCONF_ACCEPT_RA,
 176         DEVCONF_ACCEPT_REDIRECTS,
 177         DEVCONF_AUTOCONF,
 178         DEVCONF_DAD_TRANSMITS,
 179         DEVCONF_RTR_SOLICITS,
 180         DEVCONF_RTR_SOLICIT_INTERVAL,
 181         DEVCONF_RTR_SOLICIT_DELAY,
 182         DEVCONF_USE_TEMPADDR,
 183         DEVCONF_TEMP_VALID_LFT,
 184         DEVCONF_TEMP_PREFERED_LFT,
 185         DEVCONF_REGEN_MAX_RETRY,
 186         DEVCONF_MAX_DESYNC_FACTOR,
 187         DEVCONF_MAX_ADDRESSES,
 188         DEVCONF_FORCE_MLD_VERSION,
 189         DEVCONF_ACCEPT_RA_DEFRTR,
 190         DEVCONF_ACCEPT_RA_PINFO,
 191         DEVCONF_ACCEPT_RA_RTR_PREF,
 192         DEVCONF_RTR_PROBE_INTERVAL,
 193         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 194         DEVCONF_PROXY_NDP,
 195         DEVCONF_OPTIMISTIC_DAD,
 196         DEVCONF_ACCEPT_SOURCE_ROUTE,
 197         DEVCONF_MC_FORWARDING,
 198         DEVCONF_DISABLE_IPV6,
 199         DEVCONF_MAX
 200 };
 201
 202 #ifdef __KERNEL__
 203 #include <linux/icmpv6.h>
 204 #include <linux/tcp.h>
 205 #include <linux/udp.h>
 206
 207 #include <net/inet_sock.h>
 208
 209 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 210 {
 211         return (struct ipv6hdr *)skb_network_header(skb);
 212 }
 213
 214 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 215 {
 216         return (struct ipv6hdr *)skb_transport_header(skb);
 217 }
 218
 219 /*
 220    This structure contains results of exthdrs parsing
 221    as offsets from skb->nh.
 222  */
 223
 224 struct inet6_skb_parm {
 225         int                     iif;
 226         __u16                   ra;
 227         __u16                   hop;
 228         __u16                   dst0;
 229         __u16                   srcrt;
 230         __u16                   dst1;
 231         __u16                   lastopt;
 232         __u32                   nhoff;
 233         __u16                   flags;
 234 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 235         __u16                   dsthao;
 236 #endif
 237
 238 #define IP6SKB_XFRM_TRANSFORMED 1
 239 #define IP6SKB_FORWARDED        2
 240 };
 241
 242 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 243
 244 static inline int inet6_iif(const struct sk_buff *skb)
 245 {
 246         return IP6CB(skb)->iif;
 247 }
 248
 249 struct inet6_request_sock {
 250         struct in6_addr         loc_addr;
 251         struct in6_addr         rmt_addr;
 252         struct sk_buff          *pktopts;
 253         int                     iif;
 254 };
 255
 256 struct tcp6_request_sock {
 257         struct tcp_request_sock   tcp6rsk_tcp;
 258         struct inet6_request_sock tcp6rsk_inet6;
 259 };
 260
 261 struct ipv6_mc_socklist;
 262 struct ipv6_ac_socklist;
 263 struct ipv6_fl_socklist;
 264
 265 /**
 266  * struct ipv6_pinfo - ipv6 private area
 267  *
 268  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 269  * this _must_ be the last member, so that inet6_sk_generic
 270  * is able to calculate its offset from the base struct sock
 271  * by using the struct proto->slab_obj_size member. -acme
 272  */
 273 struct ipv6_pinfo {
 274         struct in6_addr         saddr;
 275         struct in6_addr         rcv_saddr;
 276         struct in6_addr         daddr;
 277         struct in6_addr         *daddr_cache;
 278 #ifdef CONFIG_IPV6_SUBTREES
 279         struct in6_addr         *saddr_cache;
 280 #endif
 281
 282         __be32                  flow_label;
 283         __u32                   frag_size;
 284
 285         /*
 286          * Packed in 16bits.
 287          * Omit one shift by by putting the signed field at MSB.
 288          */
 289 #if defined(__BIG_ENDIAN_BITFIELD)
 290         __s16                   hop_limit:9;
 291         __u16                   __unused_1:7;
 292 #else
 293         __u16                   __unused_1:7;
 294         __s16                   hop_limit:9;
 295 #endif
 296
 297 #if defined(__BIG_ENDIAN_BITFIELD)
 298         /* Packed in 16bits. */
 299         __s16                   mcast_hops:9;
 300         __u16                   __unused_2:6,
 301                                 mc_loop:1;
 302 #else
 303         __u16                   mc_loop:1,
 304                                 __unused_2:6;
 305         __s16                   mcast_hops:9;
 306 #endif
 307         int                     mcast_oif;
 308
 309         /* pktoption flags */
 310         union {
 311                 struct {
 312                         __u16   srcrt:1,
 313                                 osrcrt:1,
 314                                 rxinfo:1,
 315                                 rxoinfo:1,
 316                                 rxhlim:1,
 317                                 rxohlim:1,
 318                                 hopopts:1,
 319                                 ohopopts:1,
 320                                 dstopts:1,
 321                                 odstopts:1,
 322                                 rxflow:1,
 323                                 rxtclass:1;
 324                 } bits;
 325                 __u16           all;
 326         } rxopt;
 327
 328         /* sockopt flags */
 329         __u8                    recverr:1,
 330                                 sndflow:1,
 331                                 pmtudisc:2,
 332                                 ipv6only:1,
 333                                 srcprefs:3;     /* 001: prefer temporary address
 334                                                  * 010: prefer public address
 335                                                  * 100: prefer care-of address
 336                                                  */
 337         __u8                    tclass;
 338
 339         __u32                   dst_cookie;
 340
 341         struct ipv6_mc_socklist *ipv6_mc_list;
 342         struct ipv6_ac_socklist *ipv6_ac_list;
 343         struct ipv6_fl_socklist *ipv6_fl_list;
 344
 345         struct ipv6_txoptions   *opt;
 346         struct sk_buff          *pktoptions;
 347         struct {
 348                 struct ipv6_txoptions *opt;
 349                 u8 hop_limit;
 350                 u8 tclass;
 351         } cork;
 352 };
 353
 354 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 355 struct raw6_sock {
 356         /* inet_sock has to be the first member of raw6_sock */
 357         struct inet_sock        inet;
 358         __u32                   checksum;       /* perform checksum */
 359         __u32                   offset;         /* checksum offset  */
 360         struct icmp6_filter     filter;
 361         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 362         struct ipv6_pinfo       inet6;
 363 };
 364
 365 struct udp6_sock {
 366         struct udp_sock   udp;
 367         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 368         struct ipv6_pinfo inet6;
 369 };
 370
 371 struct tcp6_sock {
 372         struct tcp_sock   tcp;
 373         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 374         struct ipv6_pinfo inet6;
 375 };
 376
 377 extern int inet6_sk_rebuild_header(struct sock *sk);
 378
 379 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 380 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 381 {
 382         return inet_sk(__sk)->pinet6;
 383 }
 384
 385 static inline struct inet6_request_sock *
 386                         inet6_rsk(const struct request_sock *rsk)
 387 {
 388         return (struct inet6_request_sock *)(((u8 *)rsk) +
 389                                              inet_rsk(rsk)->inet6_rsk_offset);
 390 }
 391
 392 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 393 {
 394         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 395 }
 396
 397 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 398 {
 399         struct request_sock *req = reqsk_alloc(ops);
 400
 401         if (req != NULL) {
 402                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 403                 inet6_rsk(req)->pktopts = NULL;
 404         }
 405
 406         return req;
 407 }
 408
 409 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 410 {
 411         return (struct raw6_sock *)sk;
 412 }
 413
 414 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 415                                            const struct sock *sk_from)
 416 {
 417         int ancestor_size = sizeof(struct inet_sock);
 418
 419         if (sk_from->sk_family == PF_INET6)
 420                 ancestor_size += sizeof(struct ipv6_pinfo);
 421
 422         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 423 }
 424
 425 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 426 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 427
 428 struct inet6_timewait_sock {
 429         struct in6_addr tw_v6_daddr;
 430         struct in6_addr tw_v6_rcv_saddr;
 431 };
 432
 433 struct tcp6_timewait_sock {
 434         struct tcp_timewait_sock   tcp6tw_tcp;
 435         struct inet6_timewait_sock tcp6tw_inet6;
 436 };
 437
 438 static inline u16 inet6_tw_offset(const struct proto *prot)
 439 {
 440         return prot->twsk_prot->twsk_obj_size -
 441                         sizeof(struct inet6_timewait_sock);
 442 }
 443
 444 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 445 {
 446         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 447                                               inet_twsk(sk)->tw_ipv6_offset);
 448 }
 449
 450 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 451 {
 452         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 453                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 454 }
 455
 456 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 457 {
 458         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 459 }
 460
 461 static inline int inet_v6_ipv6only(const struct sock *sk)
 462 {
 463         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 464                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 465 }
 466 #else
 467 #define __ipv6_only_sock(sk)    0
 468 #define ipv6_only_sock(sk)      0
 469
 470 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 471 {
 472         return NULL;
 473 }
 474
 475 static inline struct inet6_request_sock *
 476                         inet6_rsk(const struct request_sock *rsk)
 477 {
 478         return NULL;
 479 }
 480
 481 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 482 {
 483         return NULL;
 484 }
 485
 486 #define __inet6_rcv_saddr(__sk) NULL
 487 #define inet6_rcv_saddr(__sk)   NULL
 488 #define tcp_twsk_ipv6only(__sk)         0
 489 #define inet_v6_ipv6only(__sk)          0
 490 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 491
 492 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 493         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 494          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
 495          ((__sk)->sk_family             == AF_INET6)            && \
 496          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 497          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 498          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 499
 500 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
 501         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 502          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
 503          ((__sk)->sk_family            == PF_INET6)                     && \
 504          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
 505          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
 506          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 507
 508 #endif /* __KERNEL__ */
 509
 510 #endif /* _IPV6_H */