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 /**
 197  * struct ipv6_pinfo - ipv6 private area
 198  *
 199  * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 200  * this _must_ be the last member, so that inet6_sk_generic
 201  * is able to calculate its offset from the base struct sock
 202  * by using the struct proto->slab_obj_size member. -acme
 203  */
 204 struct ipv6_pinfo {
 205         struct in6_addr         saddr;
 206         struct in6_addr         rcv_saddr;
 207         struct in6_addr         daddr;
 208         struct in6_addr         *daddr_cache;
 209
 210         __u32                   flow_label;
 211         __u32                   frag_size;
 212         __s16                   hop_limit;
 213         __s16                   mcast_hops;
 214         int                     mcast_oif;
 215
 216         /* pktoption flags */
 217         union {
 218                 struct {
 219                         __u8    srcrt:2,
 220                                 rxinfo:1,
 221                                 rxhlim:1,
 222                                 hopopts:1,
 223                                 dstopts:1,
 224                                 rxflow:1;
 225                 } bits;
 226                 __u8            all;
 227         } rxopt;
 228
 229         /* sockopt flags */
 230         __u8                    mc_loop:1,
 231                                 recverr:1,
 232                                 sndflow:1,
 233                                 pmtudisc:2,
 234                                 ipv6only:1;
 235
 236         __u32                   dst_cookie;
 237
 238         struct ipv6_mc_socklist *ipv6_mc_list;
 239         struct ipv6_ac_socklist *ipv6_ac_list;
 240         struct ipv6_fl_socklist *ipv6_fl_list;
 241
 242         struct ipv6_txoptions   *opt;
 243         struct sk_buff          *pktoptions;
 244         struct {
 245                 struct ipv6_txoptions *opt;
 246                 struct rt6_info *rt;
 247                 int hop_limit;
 248         } cork;
 249 };
 250
 251 /* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
 252 struct raw6_sock {
 253         /* inet_sock has to be the first member of raw6_sock */
 254         struct inet_sock        inet;
 255         __u32                   checksum;       /* perform checksum */
 256         __u32                   offset;         /* checksum offset  */
 257         struct icmp6_filter     filter;
 258         /* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
 259         struct ipv6_pinfo       inet6;
 260 };
 261
 262 struct udp6_sock {
 263         struct udp_sock   udp;
 264         /* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
 265         struct ipv6_pinfo inet6;
 266 };
 267
 268 struct tcp6_sock {
 269         struct tcp_sock   tcp;
 270         /* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
 271         struct ipv6_pinfo inet6;
 272 };
 273
 274 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 275 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 276 {
 277         return inet_sk(__sk)->pinet6;
 278 }
 279
 280 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 281 {
 282         return (struct raw6_sock *)sk;
 283 }
 284
 285 static inline void inet_sk_copy_descendant(struct sock *sk_to,
 286                                            const struct sock *sk_from)
 287 {
 288         int ancestor_size = sizeof(struct inet_sock);
 289
 290         if (sk_from->sk_family == PF_INET6)
 291                 ancestor_size += sizeof(struct ipv6_pinfo);
 292
 293         __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
 294 }
 295
 296 #define __ipv6_only_sock(sk)    (inet6_sk(sk)->ipv6only)
 297 #define ipv6_only_sock(sk)      ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
 298 #else
 299 #define __ipv6_only_sock(sk)    0
 300 #define ipv6_only_sock(sk)      0
 301
 302 static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 303 {
 304         return NULL;
 305 }
 306
 307 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 308 {
 309         return NULL;
 310 }
 311
 312 #endif
 313
 314 #endif
 315
 316 #endif