include/linux/ipv6.h

   1 #ifndef _IPV6_H
   2 #define _IPV6_H
   3
   4 #include <linux/config.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    /* this hop must be a neighbor  */
  32 #define IPV6_SRCRT_TYPE_0       0       /* IPv6 type 0 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 };
  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                   bitmap;         /* strict/loose bit map */
  72         struct in6_addr         addr[0];
  73
  74 #define rt0_type                rt_hdr.type
  75 };
  76
  77 struct ipv6_auth_hdr {
  78         __u8  nexthdr;
  79         __u8  hdrlen;           /* This one is measured in 32 bit units! */
  80         __u16 reserved;
  81         __u32 spi;
  82         __u32 seq_no;           /* Sequence number */
  83         __u8  auth_data[0];     /* Length variable but >=4. Mind the 64 bit alignment! */
  84 };
  85
  86 struct ipv6_esp_hdr {
  87         __u32 spi;
  88         __u32 seq_no;           /* Sequence number */
  89         __u8  enc_data[0];      /* Length variable but >=8. Mind the 64 bit alignment! */
  90 };
  91
  92 struct ipv6_comp_hdr {
  93         __u8 nexthdr;
  94         __u8 flags;
  95         __u16 cpi;
  96 };
  97
  98 /*
  99  *      IPv6 fixed header
 100  *
 101  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 102  *      are glued to priority now, forming "class".
 103  */
 104
 105 struct ipv6hdr {
 106 #if defined(__LITTLE_ENDIAN_BITFIELD)
 107         __u8                    priority:4,
 108                                 version:4;
 109 #elif defined(__BIG_ENDIAN_BITFIELD)
 110         __u8                    version:4,
 111                                 priority:4;
 112 #else
 113 #error  "Please fix <asm/byteorder.h>"
 114 #endif
 115         __u8                    flow_lbl[3];
 116
 117         __u16                   payload_len;
 118         __u8                    nexthdr;
 119         __u8                    hop_limit;
 120
 121         struct  in6_addr        saddr;
 122         struct  in6_addr        daddr;
 123 };
 124
 125 /*
 126  * This structure contains configuration options per IPv6 link.
 127  */
 128 struct ipv6_devconf {
 129         __s32           forwarding;
 130         __s32           hop_limit;
 131         __s32           mtu6;
 132         __s32           accept_ra;
 133         __s32           accept_redirects;
 134         __s32           autoconf;
 135         __s32           dad_transmits;
 136         __s32           rtr_solicits;
 137         __s32           rtr_solicit_interval;
 138         __s32           rtr_solicit_delay;
 139         __s32           force_mld_version;
 140 #ifdef CONFIG_IPV6_PRIVACY
 141         __s32           use_tempaddr;
 142         __s32           temp_valid_lft;
 143         __s32           temp_prefered_lft;
 144         __s32           regen_max_retry;
 145         __s32           max_desync_factor;
 146 #endif
 147         __s32           max_addresses;
 148         void            *sysctl;
 149 };
 150
 151 /* index values for the variables in ipv6_devconf */
 152 enum {
 153         DEVCONF_FORWARDING = 0,
 154         DEVCONF_HOPLIMIT,
 155         DEVCONF_MTU6,
 156         DEVCONF_ACCEPT_RA,
 157         DEVCONF_ACCEPT_REDIRECTS,
 158         DEVCONF_AUTOCONF,
 159         DEVCONF_DAD_TRANSMITS,
 160         DEVCONF_RTR_SOLICITS,
 161         DEVCONF_RTR_SOLICIT_INTERVAL,
 162         DEVCONF_RTR_SOLICIT_DELAY,
 163         DEVCONF_USE_TEMPADDR,
 164         DEVCONF_TEMP_VALID_LFT,
 165         DEVCONF_TEMP_PREFERED_LFT,
 166         DEVCONF_REGEN_MAX_RETRY,
 167         DEVCONF_MAX_DESYNC_FACTOR,
 168         DEVCONF_MAX_ADDRESSES,
 169         DEVCONF_FORCE_MLD_VERSION,
 170         DEVCONF_MAX
 171 };
 172
 173 #ifdef __KERNEL__
 174 #include <linux/in6.h>          /* struct sockaddr_in6 */
 175 #include <linux/icmpv6.h>
 176 #include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
 177 #include <linux/tcp.h>
 178 #include <linux/udp.h>
 179
 180 /*
 181    This structure contains results of exthdrs parsing
 182    as offsets from skb->nh.
 183  */
 184
 185 struct inet6_skb_parm {
 186         int                     iif;
 187         __u16                   ra;
 188         __u16                   hop;
 189         __u16                   dst0;
 190         __u16                   srcrt;
 191         __u16                   dst1;
 192 };
 193
 194 #define IP6CB(skb)      ((struct inet6_skb_parm*)((skb)->cb))
 195
 196 static inline int inet6_iif(const struct sk_buff *skb)
 197 {
 198         return IP6CB(skb)->iif;
 199 }
 200
 201 struct tcp6_request_sock {
 202         struct tcp_request_sock req;
 203         struct in6_addr         loc_addr;
 204         struct in6_addr         rmt_addr;
 205         struct sk_buff          *pktopts;
 206         int                     iif;
 207 };
 208
 209 static inline struct tcp6_request_sock *tcp6_rsk(const struct request_sock *sk)
 210 {
 211         return (struct tcp6_request_sock *)sk;
 212 }
 213
 214 /**
 215  * struct ipv6_pinfo - ipv6 private area
 216  *
 217  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 218  * this _must_ be the last member, so that inet6_sk_generic
 219  * is able to calculate its offset from the base struct sock
 220  * by using the struct proto->slab_obj_size member. -acme
 221  */
 222 struct ipv6_pinfo {
 223         struct in6_addr         saddr;
 224         struct in6_addr         rcv_saddr;
 225         struct in6_addr         daddr;
 226         struct in6_addr         *daddr_cache;
 227
 228         __u32                   flow_label;
 229         __u32                   frag_size;
 230         __s16                   hop_limit;
 231         __s16                   mcast_hops;
 232         int                     mcast_oif;
 233
 234         /* pktoption flags */
 235         union {
 236                 struct {
 237                         __u8    srcrt:2,
 238                                 rxinfo:1,
 239                                 rxhlim:1,
 240                                 hopopts:1,
 241                                 dstopts:1,
 242                                 rxflow:1;
 243                 } bits;
 244                 __u8            all;
 245         } rxopt;
 246
 247         /* sockopt flags */
 248         __u8                    mc_loop:1,
 249                                 recverr:1,
 250                                 sndflow:1,
 251                                 pmtudisc:2,
 252                                 ipv6only:1;
 253
 254         __u32                   dst_cookie;
 255
 256         struct ipv6_mc_socklist *ipv6_mc_list;
 257         struct ipv6_ac_socklist *ipv6_ac_list;
 258         struct ipv6_fl_socklist *ipv6_fl_list;
 259
 260         struct ipv6_txoptions   *opt;
 261         struct sk_buff          *pktoptions;
 262         struct {
 263                 struct ipv6_txoptions *opt;
 264                 struct rt6_info *rt;
 265                 int hop_limit;
 266         } cork;
 267 };
 268
 269 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 270 struct raw6_sock {
 271         /* inet_sock has to be the first member of raw6_sock */
 272         struct inet_sock        inet;
 273         __u32                   checksum;       /* perform checksum */
 274         __u32                   offset;         /* checksum offset  */
 275         struct icmp6_filter     filter;
 276         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 277         struct ipv6_pinfo       inet6;
 278 };
 279
 280 struct udp6_sock {
 281         struct udp_sock   udp;
 282         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 283         struct ipv6_pinfo inet6;
 284 };
 285
 286 struct tcp6_sock {
 287         struct tcp_sock   tcp;
 288         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 289         struct ipv6_pinfo inet6;
 290 };
 291
 292 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 293 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 294 {
 295         return inet_sk(__sk)->pinet6;
 296 }
 297
 298 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 299 {
 300         return (struct raw6_sock *)sk;
 301 }
 302
 303 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 304                                            const struct sock *sk_from)
 305 {
 306         int ancestor_size = sizeof(struct inet_sock);
 307
 308         if (sk_from->sk_family == PF_INET6)
 309                 ancestor_size += sizeof(struct ipv6_pinfo);
 310
 311         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 312 }
 313
 314 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 315 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 316
 317 #include <linux/tcp.h>
 318
 319 struct tcp6_timewait_sock {
 320         struct tcp_timewait_sock tw_v6_sk;
 321         struct in6_addr          tw_v6_daddr;
 322         struct in6_addr          tw_v6_rcv_saddr;
 323 };
 324
 325 static inline struct tcp6_timewait_sock *tcp6_twsk(const struct sock *sk)
 326 {
 327         return (struct tcp6_timewait_sock *)sk;
 328 }
 329
 330 static inline struct in6_addr *__tcp_v6_rcv_saddr(const struct sock *sk)
 331 {
 332         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 333                 &inet6_sk(sk)->rcv_saddr : &tcp6_twsk(sk)->tw_v6_rcv_saddr;
 334 }
 335
 336 static inline struct in6_addr *tcp_v6_rcv_saddr(const struct sock *sk)
 337 {
 338         return sk->sk_family == AF_INET6 ? __tcp_v6_rcv_saddr(sk) : NULL;
 339 }
 340
 341 static inline int inet_v6_ipv6only(const struct sock *sk)
 342 {
 343         return likely(sk->sk_state != TCP_TIME_WAIT) ?
 344                 ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
 345 }
 346 #else
 347 #define __ipv6_only_sock(sk)    0
 348 #define ipv6_only_sock(sk)      0
 349
 350 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 351 {
 352         return NULL;
 353 }
 354
 355 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 356 {
 357         return NULL;
 358 }
 359
 360 #define __tcp_v6_rcv_saddr(__sk)        NULL
 361 #define tcp_v6_rcv_saddr(__sk)          NULL
 362 #define tcp_twsk_ipv6only(__sk)         0
 363 #define inet_v6_ipv6only(__sk)          0
 364 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
 365
 366 #define INET6_MATCH(__sk, __saddr, __daddr, __ports, __dif)        \
 367         (((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports))   && \
 368          ((__sk)->sk_family             == AF_INET6)            && \
 369          ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))     && \
 370          ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
 371          (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
 372
 373 #endif /* __KERNEL__ */
 374
 375 #endif /* _IPV6_H */