include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <linux/types.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    /* Deprecated; will be removed */
  32 #define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
  33 #define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
  34
  35 /*
  36  *      routing header
  37  */
  38 struct ipv6_rt_hdr {
  39         __u8            nexthdr;
  40         __u8            hdrlen;
  41         __u8            type;
  42         __u8            segments_left;
  43
  44         /*
  45          *      type specific data
  46          *      variable length field
  47          */
  48 };
  49
  50
  51 struct ipv6_opt_hdr {
  52         __u8            nexthdr;
  53         __u8            hdrlen;
  54         /*
  55          * TLV encoded option data follows.
  56          */
  57 } __attribute__ ((packed));     /* required for some archs */
  58
  59 #define ipv6_destopt_hdr ipv6_opt_hdr
  60 #define ipv6_hopopt_hdr  ipv6_opt_hdr
  61
  62 #ifdef __KERNEL__
  63 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
  64 #endif
  65
  66 /*
  67  *      routing header type 0 (used in cmsghdr struct)
  68  */
  69
  70 struct rt0_hdr {
  71         struct ipv6_rt_hdr      rt_hdr;
  72         __u32                   reserved;
  73         struct in6_addr         addr[0];
  74
  75 #define rt0_type                rt_hdr.type
  76 };
  77
  78 /*
  79  *      routing header type 2
  80  */
  81
  82 struct rt2_hdr {
  83         struct ipv6_rt_hdr      rt_hdr;
  84         __u32                   reserved;
  85         struct in6_addr         addr;
  86
  87 #define rt2_type                rt_hdr.type
  88 };
  89
  90 /*
  91  *      home address option in destination options header
  92  */
  93
  94 struct ipv6_destopt_hao {
  95         __u8                    type;
  96         __u8                    length;
  97         struct in6_addr         addr;
  98 } __attribute__ ((__packed__));
  99
 100 /*
 101  *      IPv6 fixed header
 102  *
 103  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 104  *      are glued to priority now, forming "class".
 105  */
 106
 107 struct ipv6hdr {
 108 #if defined(__LITTLE_ENDIAN_BITFIELD)
 109         __u8                    priority:4,
 110                                 version:4;
 111 #elif defined(__BIG_ENDIAN_BITFIELD)
 112         __u8                    version:4,
 113                                 priority:4;
 114 #else
 115 #error  "Please fix <asm/byteorder.h>"
 116 #endif
 117         __u8                    flow_lbl[3];
 118
 119         __be16                  payload_len;
 120         __u8                    nexthdr;
 121         __u8                    hop_limit;
 122
 123         struct  in6_addr        saddr;
 124         struct  in6_addr        daddr;
 125 };
 126
 127 #ifdef __KERNEL__
 128 /*
 129  * This structure contains configuration options per IPv6 link.
 130  */
 131 struct ipv6_devconf {
 132         __s32           forwarding;
 133         __s32           hop_limit;
 134         __s32           mtu6;
 135         __s32           accept_ra;
 136         __s32           accept_redirects;
 137         __s32           autoconf;
 138         __s32           dad_transmits;
 139         __s32           rtr_solicits;
 140         __s32           rtr_solicit_interval;
 141         __s32           rtr_solicit_delay;
 142         __s32           force_mld_version;
 143 #ifdef CONFIG_IPV6_PRIVACY
 144         __s32           use_tempaddr;
 145         __s32           temp_valid_lft;
 146         __s32           temp_prefered_lft;
 147         __s32           regen_max_retry;
 148         __s32           max_desync_factor;
 149 #endif
 150         __s32           max_addresses;
 151         __s32           accept_ra_defrtr;
 152         __s32           accept_ra_pinfo;
 153 #ifdef CONFIG_IPV6_ROUTER_PREF
 154         __s32           accept_ra_rtr_pref;
 155         __s32           rtr_probe_interval;
 156 #ifdef CONFIG_IPV6_ROUTE_INFO
 157         __s32           accept_ra_rt_info_max_plen;
 158 #endif
 159 #endif
 160         __s32           proxy_ndp;
 161         __s32           accept_source_route;
 162 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 163         __s32           optimistic_dad;
 164 #endif
 165 #ifdef CONFIG_IPV6_MROUTE
 166         __s32           mc_forwarding;
 167 #endif
 168         __s32           disable_ipv6;
 169         __s32           accept_dad;
 170         void            *sysctl;
 171 };
 172
 173 struct ipv6_params {
 174         __s32 disable_ipv6;
 175         __s32 autoconf;
 176 };
 177 extern struct ipv6_params ipv6_defaults;
 178 #endif
 179
 180 /* index values for the variables in ipv6_devconf */
 181 enum {
 182         DEVCONF_FORWARDING = 0,
 183         DEVCONF_HOPLIMIT,
 184         DEVCONF_MTU6,
 185         DEVCONF_ACCEPT_RA,
 186         DEVCONF_ACCEPT_REDIRECTS,
 187         DEVCONF_AUTOCONF,
 188         DEVCONF_DAD_TRANSMITS,
 189         DEVCONF_RTR_SOLICITS,
 190         DEVCONF_RTR_SOLICIT_INTERVAL,
 191         DEVCONF_RTR_SOLICIT_DELAY,
 192         DEVCONF_USE_TEMPADDR,
 193         DEVCONF_TEMP_VALID_LFT,
 194         DEVCONF_TEMP_PREFERED_LFT,
 195         DEVCONF_REGEN_MAX_RETRY,
 196         DEVCONF_MAX_DESYNC_FACTOR,
 197         DEVCONF_MAX_ADDRESSES,
 198         DEVCONF_FORCE_MLD_VERSION,
 199         DEVCONF_ACCEPT_RA_DEFRTR,
 200         DEVCONF_ACCEPT_RA_PINFO,
 201         DEVCONF_ACCEPT_RA_RTR_PREF,
 202         DEVCONF_RTR_PROBE_INTERVAL,
 203         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 204         DEVCONF_PROXY_NDP,
 205         DEVCONF_OPTIMISTIC_DAD,
 206         DEVCONF_ACCEPT_SOURCE_ROUTE,
 207         DEVCONF_MC_FORWARDING,
 208         DEVCONF_DISABLE_IPV6,
 209         DEVCONF_ACCEPT_DAD,
 210         DEVCONF_MAX
 211 };
 212
 213 #ifdef __KERNEL__
 214 #include <linux/icmpv6.h>
 215 #include <linux/tcp.h>
 216 #include <linux/udp.h>
 217
 218 #include <net/inet_sock.h>
 219
 220 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 221 {
 222         return (struct ipv6hdr *)skb_network_header(skb);
 223 }
 224
 225 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 226 {
 227         return (struct ipv6hdr *)skb_transport_header(skb);
 228 }
 229
 230 /*
 231    This structure contains results of exthdrs parsing
 232    as offsets from skb->nh.
 233  */
 234
 235 struct inet6_skb_parm {
 236         int                     iif;
 237         __u16                   ra;
 238         __u16                   hop;
 239         __u16                   dst0;
 240         __u16                   srcrt;
 241         __u16                   dst1;
 242         __u16                   lastopt;
 243         __u32                   nhoff;
 244         __u16                   flags;
 245 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 246         __u16                   dsthao;
 247 #endif
 248
 249 #define IP6SKB_XFRM_TRANSFORMED 1
 250 #define IP6SKB_FORWARDED        2
 251 };
 252
 253 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 254
 255 static inline int inet6_iif(const struct sk_buff *skb)
 256 {
 257         return IP6CB(skb)->iif;
 258 }
 259
 260 struct inet6_request_sock {
 261         struct in6_addr         loc_addr;
 262         struct in6_addr         rmt_addr;
 263         struct sk_buff          *pktopts;
 264         int                     iif;
 265 };
 266
 267 struct tcp6_request_sock {
 268         struct tcp_request_sock   tcp6rsk_tcp;
 269         struct inet6_request_sock tcp6rsk_inet6;
 270 };
 271
 272 struct ipv6_mc_socklist;
 273 struct ipv6_ac_socklist;
 274 struct ipv6_fl_socklist;
 275
 276 /**
 277  * struct ipv6_pinfo - ipv6 private area
 278  *
 279  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 280  * this _must_ be the last member, so that inet6_sk_generic
 281  * is able to calculate its offset from the base struct sock
 282  * by using the struct proto->slab_obj_size member. -acme
 283  */
 284 struct ipv6_pinfo {
 285         struct in6_addr         saddr;
 286         struct in6_addr         rcv_saddr;
 287         struct in6_addr         daddr;
 288         struct in6_pktinfo      sticky_pktinfo;
 289         struct in6_addr         *daddr_cache;
 290 #ifdef CONFIG_IPV6_SUBTREES
 291         struct in6_addr         *saddr_cache;
 292 #endif
 293
 294         __be32                  flow_label;
 295         __u32                   frag_size;
 296
 297         /*
 298          * Packed in 16bits.
 299          * Omit one shift by by putting the signed field at MSB.
 300          */
 301 #if defined(__BIG_ENDIAN_BITFIELD)
 302         __s16                   hop_limit:9;
 303         __u16                   __unused_1:7;
 304 #else
 305         __u16                   __unused_1:7;
 306         __s16                   hop_limit:9;
 307 #endif
 308
 309 #if defined(__BIG_ENDIAN_BITFIELD)
 310         /* Packed in 16bits. */
 311         __s16                   mcast_hops:9;
 312         __u16                   __unused_2:6,
 313                                 mc_loop:1;
 314 #else
 315         __u16                   mc_loop:1,
 316                                 __unused_2:6;
 317         __s16                   mcast_hops:9;
 318 #endif
 319         int                     mcast_oif;
 320
 321         /* pktoption flags */
 322         union {
 323                 struct {
 324                         __u16   srcrt:1,
 325                                 osrcrt:1,
 326                                 rxinfo:1,
 327                                 rxoinfo:1,
 328                                 rxhlim:1,
 329                                 rxohlim:1,
 330                                 hopopts:1,
 331                                 ohopopts:1,
 332                                 dstopts:1,
 333                                 odstopts:1,
 334                                 rxflow:1,
 335                                 rxtclass:1;
 336                 } bits;
 337                 __u16           all;
 338         } rxopt;
 339
 340         /* sockopt flags */
 341         __u8                    recverr:1,
 342                                 sndflow:1,
 343                                 pmtudisc:2,
 344                                 ipv6only:1,
 345                                 srcprefs:3;     /* 001: prefer temporary address
 346                                                  * 010: prefer public address
 347                                                  * 100: prefer care-of address
 348                                                  */
 349         __u8                    tclass;
 350
 351         __u32                   dst_cookie;
 352
 353         struct ipv6_mc_socklist *ipv6_mc_list;
 354         struct ipv6_ac_socklist *ipv6_ac_list;
 355         struct ipv6_fl_socklist *ipv6_fl_list;
 356
 357         struct ipv6_txoptions   *opt;
 358         struct sk_buff          *pktoptions;
 359         struct {
 360                 struct ipv6_txoptions *opt;
 361                 u8 hop_limit;
 362                 u8 tclass;
 363         } cork;
 364 };
 365
 366 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 367 struct raw6_sock {
 368         /* inet_sock has to be the first member of raw6_sock */
 369         struct inet_sock        inet;
 370         __u32                   checksum;       /* perform checksum */
 371         __u32                   offset;         /* checksum offset  */
 372         struct icmp6_filter     filter;
 373         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 374         struct ipv6_pinfo       inet6;
 375 };
 376
 377 struct udp6_sock {
 378         struct udp_sock   udp;
 379         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 380         struct ipv6_pinfo inet6;
 381 };
 382
 383 struct tcp6_sock {
 384         struct tcp_sock   tcp;
 385         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 386         struct ipv6_pinfo inet6;
 387 };
 388
 389 extern int inet6_sk_rebuild_header(struct sock *sk);
 390
 391 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 392 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 393 {
 394         return inet_sk(__sk)->pinet6;
 395 }
 396
 397 static inline struct inet6_request_sock *
 398                         inet6_rsk(const struct request_sock *rsk)
 399 {
 400         return (struct inet6_request_sock *)(((u8 *)rsk) +
 401                                              inet_rsk(rsk)->inet6_rsk_offset);
 402 }
 403
 404 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 405 {
 406         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 407 }
 408
 409 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 410 {
 411         struct request_sock *req = reqsk_alloc(ops);
 412
 413         if (req != NULL) {
 414                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 415                 inet6_rsk(req)->pktopts = NULL;
 416         }
 417
 418         return req;
 419 }
 420
 421 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 422 {
 423         return (struct raw6_sock *)sk;
 424 }
 425
 426 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 427                                            const struct sock *sk_from)
 428 {
 429         int ancestor_size = sizeof(struct inet_sock);
 430
 431         if (sk_from->sk_family == PF_INET6)
 432                 ancestor_size += sizeof(struct ipv6_pinfo);
 433
 434         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 435 }
 436
 437 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 438 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 439
 440 struct inet6_timewait_sock {
 441         struct in6_addr tw_v6_daddr;
 442         struct in6_addr tw_v6_rcv_saddr;
 443 };
 444
 445 struct tcp6_timewait_sock {
 446         struct tcp_timewait_sock   tcp6tw_tcp;
 447         struct inet6_timewait_sock tcp6tw_inet6;
 448 };
 449
 450 static inline u16 inet6_tw_offset(const struct proto *prot)
 451 {
 452         return prot->twsk_prot->twsk_obj_size -
 453                         sizeof(struct inet6_timewait_sock);
 454 }
 455
 456 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 457 {
 458         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 459                                               inet_twsk(sk)->tw_ipv6_offset);
 460 }
 461
 462 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 463 {
 464         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 465                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 466 }
 467
 468 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 469 {
 470         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 471 }
 472
 473 static inline int inet_v6_ipv6only(const struct sock *sk)
 474 {
 475         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 476                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 477 }
 478 #else
 479 #define __ipv6_only_sock(sk)    0
 480 #define ipv6_only_sock(sk)      0
 481
 482 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 483 {
 484         return NULL;
 485 }
 486
 487 static inline struct inet6_request_sock *
 488                         inet6_rsk(const struct request_sock *rsk)
 489 {
 490         return NULL;
 491 }
 492
 493 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 494 {
 495         return NULL;
 496 }
 497
 498 #define __inet6_rcv_saddr(__sk) NULL
 499 #define inet6_rcv_saddr(__sk)   NULL
 500 #define tcp_twsk_ipv6only(__sk)         0
 501 #define inet_v6_ipv6only(__sk)          0
 502 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 503
 504 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 505         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 506          ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports))      && \
 507          ((__sk)->sk_family             == AF_INET6)            && \
 508          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 509          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 510          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 511
 512 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
 513         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 514          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
 515          ((__sk)->sk_family            == PF_INET6)                     && \
 516          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
 517          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
 518          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 519
 520 #endif /* __KERNEL__ */
 521
 522 #endif /* _IPV6_H */