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