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