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 struct ip6_mtuinfo {
  25         struct sockaddr_in6     ip6m_addr;
  26         __u32                   ip6m_mtu;
  27 };
  28
  29 struct in6_ifreq {
  30         struct in6_addr ifr6_addr;
  31         __u32           ifr6_prefixlen;
  32         int             ifr6_ifindex;
  33 };
  34
  35 #define IPV6_SRCRT_STRICT       0x01    /* Deprecated; will be removed */
  36 #define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
  37 #define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
  38
  39 /*
  40  *      routing header
  41  */
  42 struct ipv6_rt_hdr {
  43         __u8            nexthdr;
  44         __u8            hdrlen;
  45         __u8            type;
  46         __u8            segments_left;
  47
  48         /*
  49          *      type specific data
  50          *      variable length field
  51          */
  52 };
  53
  54
  55 struct ipv6_opt_hdr {
  56         __u8            nexthdr;
  57         __u8            hdrlen;
  58         /*
  59          * TLV encoded option data follows.
  60          */
  61 } __attribute__((packed));      /* required for some archs */
  62
  63 #define ipv6_destopt_hdr ipv6_opt_hdr
  64 #define ipv6_hopopt_hdr  ipv6_opt_hdr
  65
  66 #ifdef __KERNEL__
  67 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
  68 #endif
  69
  70 /*
  71  *      routing header type 0 (used in cmsghdr struct)
  72  */
  73
  74 struct rt0_hdr {
  75         struct ipv6_rt_hdr      rt_hdr;
  76         __u32                   reserved;
  77         struct in6_addr         addr[0];
  78
  79 #define rt0_type                rt_hdr.type
  80 };
  81
  82 /*
  83  *      routing header type 2
  84  */
  85
  86 struct rt2_hdr {
  87         struct ipv6_rt_hdr      rt_hdr;
  88         __u32                   reserved;
  89         struct in6_addr         addr;
  90
  91 #define rt2_type                rt_hdr.type
  92 };
  93
  94 /*
  95  *      home address option in destination options header
  96  */
  97
  98 struct ipv6_destopt_hao {
  99         __u8                    type;
 100         __u8                    length;
 101         struct in6_addr         addr;
 102 } __attribute__((packed));
 103
 104 /*
 105  *      IPv6 fixed header
 106  *
 107  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 108  *      are glued to priority now, forming "class".
 109  */
 110
 111 struct ipv6hdr {
 112 #if defined(__LITTLE_ENDIAN_BITFIELD)
 113         __u8                    priority:4,
 114                                 version:4;
 115 #elif defined(__BIG_ENDIAN_BITFIELD)
 116         __u8                    version:4,
 117                                 priority:4;
 118 #else
 119 #error  "Please fix <asm/byteorder.h>"
 120 #endif
 121         __u8                    flow_lbl[3];
 122
 123         __be16                  payload_len;
 124         __u8                    nexthdr;
 125         __u8                    hop_limit;
 126
 127         struct  in6_addr        saddr;
 128         struct  in6_addr        daddr;
 129 };
 130
 131 #ifdef __KERNEL__
 132 /*
 133  * This structure contains configuration options per IPv6 link.
 134  */
 135 struct ipv6_devconf {
 136         __s32           forwarding;
 137         __s32           hop_limit;
 138         __s32           mtu6;
 139         __s32           accept_ra;
 140         __s32           accept_redirects;
 141         __s32           autoconf;
 142         __s32           dad_transmits;
 143         __s32           rtr_solicits;
 144         __s32           rtr_solicit_interval;
 145         __s32           rtr_solicit_delay;
 146         __s32           force_mld_version;
 147 #ifdef CONFIG_IPV6_PRIVACY
 148         __s32           use_tempaddr;
 149         __s32           temp_valid_lft;
 150         __s32           temp_prefered_lft;
 151         __s32           regen_max_retry;
 152         __s32           max_desync_factor;
 153 #endif
 154         __s32           max_addresses;
 155         __s32           accept_ra_defrtr;
 156         __s32           accept_ra_pinfo;
 157 #ifdef CONFIG_IPV6_ROUTER_PREF
 158         __s32           accept_ra_rtr_pref;
 159         __s32           rtr_probe_interval;
 160 #ifdef CONFIG_IPV6_ROUTE_INFO
 161         __s32           accept_ra_rt_info_max_plen;
 162 #endif
 163 #endif
 164         __s32           proxy_ndp;
 165         __s32           accept_source_route;
 166 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
 167         __s32           optimistic_dad;
 168 #endif
 169 #ifdef CONFIG_IPV6_MROUTE
 170         __s32           mc_forwarding;
 171 #endif
 172         __s32           disable_ipv6;
 173         __s32           accept_dad;
 174         __s32           force_tllao;
 175         void            *sysctl;
 176 };
 177
 178 struct ipv6_params {
 179         __s32 disable_ipv6;
 180         __s32 autoconf;
 181 };
 182 extern struct ipv6_params ipv6_defaults;
 183 #endif
 184
 185 /* index values for the variables in ipv6_devconf */
 186 enum {
 187         DEVCONF_FORWARDING = 0,
 188         DEVCONF_HOPLIMIT,
 189         DEVCONF_MTU6,
 190         DEVCONF_ACCEPT_RA,
 191         DEVCONF_ACCEPT_REDIRECTS,
 192         DEVCONF_AUTOCONF,
 193         DEVCONF_DAD_TRANSMITS,
 194         DEVCONF_RTR_SOLICITS,
 195         DEVCONF_RTR_SOLICIT_INTERVAL,
 196         DEVCONF_RTR_SOLICIT_DELAY,
 197         DEVCONF_USE_TEMPADDR,
 198         DEVCONF_TEMP_VALID_LFT,
 199         DEVCONF_TEMP_PREFERED_LFT,
 200         DEVCONF_REGEN_MAX_RETRY,
 201         DEVCONF_MAX_DESYNC_FACTOR,
 202         DEVCONF_MAX_ADDRESSES,
 203         DEVCONF_FORCE_MLD_VERSION,
 204         DEVCONF_ACCEPT_RA_DEFRTR,
 205         DEVCONF_ACCEPT_RA_PINFO,
 206         DEVCONF_ACCEPT_RA_RTR_PREF,
 207         DEVCONF_RTR_PROBE_INTERVAL,
 208         DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
 209         DEVCONF_PROXY_NDP,
 210         DEVCONF_OPTIMISTIC_DAD,
 211         DEVCONF_ACCEPT_SOURCE_ROUTE,
 212         DEVCONF_MC_FORWARDING,
 213         DEVCONF_DISABLE_IPV6,
 214         DEVCONF_ACCEPT_DAD,
 215         DEVCONF_FORCE_TLLAO,
 216         DEVCONF_MAX
 217 };
 218
 219 #ifdef __KERNEL__
 220 #include <linux/icmpv6.h>
 221 #include <linux/tcp.h>
 222 #include <linux/udp.h>
 223
 224 #include <net/inet_sock.h>
 225
 226 static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
 227 {
 228         return (struct ipv6hdr *)skb_network_header(skb);
 229 }
 230
 231 static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
 232 {
 233         return (struct ipv6hdr *)skb_transport_header(skb);
 234 }
 235
 236 static inline __u8 ipv6_tclass(const struct ipv6hdr *iph)
 237 {
 238         return (ntohl(*(__be32 *)iph) >> 20) & 0xff;
 239 }
 240
 241 /*
 242    This structure contains results of exthdrs parsing
 243    as offsets from skb->nh.
 244  */
 245
 246 struct inet6_skb_parm {
 247         int                     iif;
 248         __u16                   ra;
 249         __u16                   hop;
 250         __u16                   dst0;
 251         __u16                   srcrt;
 252         __u16                   dst1;
 253         __u16                   lastopt;
 254         __u16                   nhoff;
 255         __u16                   flags;
 256 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
 257         __u16                   dsthao;
 258 #endif
 259
 260 #define IP6SKB_XFRM_TRANSFORMED 1
 261 #define IP6SKB_FORWARDED        2
 262 #define IP6SKB_REROUTED         4
 263 };
 264
 265 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 266 #define IP6CBMTU(skb)   ((struct ip6_mtuinfo *)((skb)->cb))
 267
 268 static inline int inet6_iif(const struct sk_buff *skb)
 269 {
 270         return IP6CB(skb)->iif;
 271 }
 272
 273 struct inet6_request_sock {
 274         struct in6_addr         loc_addr;
 275         struct in6_addr         rmt_addr;
 276         struct sk_buff          *pktopts;
 277         int                     iif;
 278 };
 279
 280 struct tcp6_request_sock {
 281         struct tcp_request_sock   tcp6rsk_tcp;
 282         struct inet6_request_sock tcp6rsk_inet6;
 283 };
 284
 285 struct ipv6_mc_socklist;
 286 struct ipv6_ac_socklist;
 287 struct ipv6_fl_socklist;
 288
 289 /**
 290  * struct ipv6_pinfo - ipv6 private area
 291  *
 292  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 293  * this _must_ be the last member, so that inet6_sk_generic
 294  * is able to calculate its offset from the base struct sock
 295  * by using the struct proto->slab_obj_size member. -acme
 296  */
 297 struct ipv6_pinfo {
 298         struct in6_addr         saddr;
 299         struct in6_addr         rcv_saddr;
 300         struct in6_addr         daddr;
 301         struct in6_pktinfo      sticky_pktinfo;
 302         struct in6_addr         *daddr_cache;
 303 #ifdef CONFIG_IPV6_SUBTREES
 304         struct in6_addr         *saddr_cache;
 305 #endif
 306
 307         __be32                  flow_label;
 308         __u32                   frag_size;
 309
 310         /*
 311          * Packed in 16bits.
 312          * Omit one shift by by putting the signed field at MSB.
 313          */
 314 #if defined(__BIG_ENDIAN_BITFIELD)
 315         __s16                   hop_limit:9;
 316         __u16                   __unused_1:7;
 317 #else
 318         __u16                   __unused_1:7;
 319         __s16                   hop_limit:9;
 320 #endif
 321
 322 #if defined(__BIG_ENDIAN_BITFIELD)
 323         /* Packed in 16bits. */
 324         __s16                   mcast_hops:9;
 325         __u16                   __unused_2:6,
 326                                 mc_loop:1;
 327 #else
 328         __u16                   mc_loop:1,
 329                                 __unused_2:6;
 330         __s16                   mcast_hops:9;
 331 #endif
 332         int                     ucast_oif;
 333         int                     mcast_oif;
 334
 335         /* pktoption flags */
 336         union {
 337                 struct {
 338                         __u16   srcrt:1,
 339                                 osrcrt:1,
 340                                 rxinfo:1,
 341                                 rxoinfo:1,
 342                                 rxhlim:1,
 343                                 rxohlim:1,
 344                                 hopopts:1,
 345                                 ohopopts:1,
 346                                 dstopts:1,
 347                                 odstopts:1,
 348                                 rxflow:1,
 349                                 rxtclass:1,
 350                                 rxpmtu:1,
 351                                 rxorigdstaddr:1;
 352                                 /* 2 bits hole */
 353                 } bits;
 354                 __u16           all;
 355         } rxopt;
 356
 357         /* sockopt flags */
 358         __u16                   recverr:1,
 359                                 sndflow:1,
 360                                 pmtudisc:2,
 361                                 ipv6only:1,
 362                                 srcprefs:3,     /* 001: prefer temporary address
 363                                                  * 010: prefer public address
 364                                                  * 100: prefer care-of address
 365                                                  */
 366                                 dontfrag:1;
 367         __u8                    min_hopcount;
 368         __u8                    tclass;
 369         __u8                    rcv_tclass;
 370
 371         __u32                   dst_cookie;
 372
 373         struct ipv6_mc_socklist __rcu *ipv6_mc_list;
 374         struct ipv6_ac_socklist *ipv6_ac_list;
 375         struct ipv6_fl_socklist *ipv6_fl_list;
 376
 377         struct ipv6_txoptions   *opt;
 378         struct sk_buff          *pktoptions;
 379         struct sk_buff          *rxpmtu;
 380         struct {
 381                 struct ipv6_txoptions *opt;
 382                 u8 hop_limit;
 383                 u8 tclass;
 384         } cork;
 385 };
 386
 387 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 388 struct raw6_sock {
 389         /* inet_sock has to be the first member of raw6_sock */
 390         struct inet_sock        inet;
 391         __u32                   checksum;       /* perform checksum */
 392         __u32                   offset;         /* checksum offset  */
 393         struct icmp6_filter     filter;
 394         __u32                   ip6mr_table;
 395         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 396         struct ipv6_pinfo       inet6;
 397 };
 398
 399 struct udp6_sock {
 400         struct udp_sock   udp;
 401         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 402         struct ipv6_pinfo inet6;
 403 };
 404
 405 struct tcp6_sock {
 406         struct tcp_sock   tcp;
 407         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 408         struct ipv6_pinfo inet6;
 409 };
 410
 411 extern int inet6_sk_rebuild_header(struct sock *sk);
 412
 413 #if IS_ENABLED(CONFIG_IPV6)
 414 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 415 {
 416         return inet_sk(__sk)->pinet6;
 417 }
 418
 419 static inline struct inet6_request_sock *
 420                         inet6_rsk(const struct request_sock *rsk)
 421 {
 422         return (struct inet6_request_sock *)(((u8 *)rsk) +
 423                                              inet_rsk(rsk)->inet6_rsk_offset);
 424 }
 425
 426 static inline u32 inet6_rsk_offset(struct request_sock *rsk)
 427 {
 428         return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
 429 }
 430
 431 static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
 432 {
 433         struct request_sock *req = reqsk_alloc(ops);
 434
 435         if (req != NULL) {
 436                 inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
 437                 inet6_rsk(req)->pktopts = NULL;
 438         }
 439
 440         return req;
 441 }
 442
 443 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 444 {
 445         return (struct raw6_sock *)sk;
 446 }
 447
 448 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 449                                            const struct sock *sk_from)
 450 {
 451         int ancestor_size = sizeof(struct inet_sock);
 452
 453         if (sk_from->sk_family == PF_INET6)
 454                 ancestor_size += sizeof(struct ipv6_pinfo);
 455
 456         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 457 }
 458
 459 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 460 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 461
 462 struct inet6_timewait_sock {
 463         struct in6_addr tw_v6_daddr;
 464         struct in6_addr tw_v6_rcv_saddr;
 465 };
 466
 467 struct tcp6_timewait_sock {
 468         struct tcp_timewait_sock   tcp6tw_tcp;
 469         struct inet6_timewait_sock tcp6tw_inet6;
 470 };
 471
 472 static inline u16 inet6_tw_offset(const struct proto *prot)
 473 {
 474         return prot->twsk_prot->twsk_obj_size -
 475                         sizeof(struct inet6_timewait_sock);
 476 }
 477
 478 static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 479 {
 480         return (struct inet6_timewait_sock *)(((u8 *)sk) +
 481                                               inet_twsk(sk)->tw_ipv6_offset);
 482 }
 483
 484 static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 485 {
 486         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 487                 &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 488 }
 489
 490 static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 491 {
 492         return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 493 }
 494
 495 static inline int inet_v6_ipv6only(const struct sock *sk)
 496 {
 497         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 498                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 499 }
 500 #else
 501 #define __ipv6_only_sock(sk)    0
 502 #define ipv6_only_sock(sk)      0
 503
 504 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 505 {
 506         return NULL;
 507 }
 508
 509 static inline struct inet6_request_sock *
 510                         inet6_rsk(const struct request_sock *rsk)
 511 {
 512         return NULL;
 513 }
 514
 515 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 516 {
 517         return NULL;
 518 }
 519
 520 #define __inet6_rcv_saddr(__sk) NULL
 521 #define inet6_rcv_saddr(__sk)   NULL
 522 #define tcp_twsk_ipv6only(__sk)         0
 523 #define inet_v6_ipv6only(__sk)          0
 524 #endif /* IS_ENABLED(CONFIG_IPV6) */
 525
 526 #define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
 527         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 528          ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
 529          ((__sk)->sk_family             == AF_INET6)            && \
 530          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 531          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 532          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 533
 534 #define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
 535         (((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)   && \
 536          (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))   && \
 537          ((__sk)->sk_family            == PF_INET6)                     && \
 538          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))   && \
 539          (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
 540          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 541
 542 #endif /* __KERNEL__ */
 543
 544 #endif /* _IPV6_H */