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    /* this hop must be a neighbor  */
  31 #define IPV6_SRCRT_TYPE_0       0       /* IPv6 type 0 Routing Header   */
  32
  33 /*
  34  *      routing header
  35  */
  36 struct ipv6_rt_hdr {
  37         __u8            nexthdr;
  38         __u8            hdrlen;
  39         __u8            type;
  40         __u8            segments_left;
  41
  42         /*
  43          *      type specific data
  44          *      variable length field
  45          */
  46 };
  47
  48
  49 struct ipv6_opt_hdr {
  50         __u8            nexthdr;
  51         __u8            hdrlen;
  52         /*
  53          * TLV encoded option data follows.
  54          */
  55 };
  56
  57 #define ipv6_destopt_hdr ipv6_opt_hdr
  58 #define ipv6_hopopt_hdr  ipv6_opt_hdr
  59
  60 #ifdef __KERNEL__
  61 #define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
  62 #endif
  63
  64 /*
  65  *      routing header type 0 (used in cmsghdr struct)
  66  */
  67
  68 struct rt0_hdr {
  69         struct ipv6_rt_hdr      rt_hdr;
  70         __u32                   bitmap;         /* strict/loose bit map */
  71         struct in6_addr         addr[0];
  72
  73 #define rt0_type                rt_hdr.type;
  74 };
  75
  76 /*
  77  *      IPv6 fixed header
  78  *
  79  *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
  80  *      are glued to priority now, forming "class".
  81  */
  82
  83 struct ipv6hdr {
  84 #if defined(__LITTLE_ENDIAN_BITFIELD)
  85         __u8                    priority:4,
  86                                 version:4;
  87 #elif defined(__BIG_ENDIAN_BITFIELD)
  88         __u8                    version:4,
  89                                 priority:4;
  90 #else
  91 #error  "Please fix <asm/byteorder.h>"
  92 #endif
  93         __u8                    flow_lbl[3];
  94
  95         __u16                   payload_len;
  96         __u8                    nexthdr;
  97         __u8                    hop_limit;
  98
  99         struct  in6_addr        saddr;
 100         struct  in6_addr        daddr;
 101 };
 102
 103 #ifdef __KERNEL__
 104
 105 /*
 106    This structure contains results of exthdrs parsing
 107    as offsets from skb->nh.
 108  */
 109
 110 struct inet6_skb_parm
 111 {
 112         int                     iif;
 113         __u16                   ra;
 114         __u16                   hop;
 115         __u16                   auth;
 116         __u16                   dst0;
 117         __u16                   srcrt;
 118         __u16                   dst1;
 119 };
 120
 121 #endif
 122
 123 #endif