inet/netinet/ip6.h

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _NETINET_IP6_H
  20 #define _NETINET_IP6_H 1
  21
  22 #include <inttypes.h>
  23 #include <netinet/in.h>
  24
  25 struct ip6_hdr
  26   {
  27     union
  28       {
  29         struct ip6_hdrctl
  30           {
  31             uint32_t ip6_un1_flow;   /* 24 bits of flow-ID */
  32             uint16_t ip6_un1_plen;   /* payload length */
  33             uint8_t  ip6_un1_nxt;    /* next header */
  34             uint8_t  ip6_un1_hlim;   /* hop limit */
  35           } ip6_un1;
  36         uint8_t ip6_un2_vfc;       /* 4 bits version, 4 bits priority */
  37       } ip6_ctlun;
  38     struct in6_addr ip6_src;      /* source address */
  39     struct in6_addr ip6_dst;      /* destination address */
  40   };
  41
  42 #define ip6_vfc   ip6_ctlun.ip6_un2_vfc
  43 #define ip6_flow  ip6_ctlun.ip6_un1.ip6_un1_flow
  44 #define ip6_plen  ip6_ctlun.ip6_un1.ip6_un1_plen
  45 #define ip6_nxt   ip6_ctlun.ip6_un1.ip6_un1_nxt
  46 #define ip6_hlim  ip6_ctlun.ip6_un1.ip6_un1_hlim
  47 #define ip6_hops  ip6_ctlun.ip6_un1.ip6_un1_hlim
  48
  49 /* Hop-by-Hop options header.  */
  50 struct ip6_hbh
  51   {
  52     uint8_t  ip6h_nxt;        /* next hesder.  */
  53     uint8_t  ip6h_len;        /* length in units of 8 octets.  */
  54     /* followed by options */
  55   };
  56
  57 /* Destination options header */
  58 struct ip6_dest
  59   {
  60     uint8_t  ip6d_nxt;        /* next header */
  61     uint8_t  ip6d_len;        /* length in units of 8 octets */
  62     /* followed by options */
  63   };
  64
  65 /* Routing header */
  66 struct ip6_rthdr
  67   {
  68     uint8_t  ip6r_nxt;        /* next header */
  69     uint8_t  ip6r_len;        /* length in units of 8 octets */
  70     uint8_t  ip6r_type;       /* routing type */
  71     uint8_t  ip6r_segleft;    /* segments left */
  72     /* followed by routing type specific data */
  73   };
  74
  75 /* Type 0 Routing header */
  76 struct ip6_rthdr0
  77   {
  78     uint8_t  ip6r0_nxt;       /* next header */
  79     uint8_t  ip6r0_len;       /* length in units of 8 octets */
  80     uint8_t  ip6r0_type;      /* always zero */
  81     uint8_t  ip6r0_segleft;   /* segments left */
  82     uint8_t  ip6r0_reserved;  /* reserved field */
  83     uint8_t  ip6r0_slmap[3];  /* strict/loose bit map */
  84     struct in6_addr  ip6r0_addr[1];  /* up to 23 addresses */
  85   };
  86
  87 /* Fragment header */
  88 struct ip6_frag
  89   {
  90     uint8_t   ip6f_nxt;       /* next header */
  91     uint8_t   ip6f_reserved;  /* reserved field */
  92     uint16_t  ip6f_offlg;     /* offset, reserved, and flag */
  93     uint32_t  ip6f_ident;     /* identification */
  94   };
  95
  96 #if     BYTE_ORDER == BIG_ENDIAN
  97 #define IP6F_OFF_MASK       0xfff8  /* mask out offset from _offlg */
  98 #define IP6F_RESERVED_MASK  0x0006  /* reserved bits in ip6f_offlg */
  99 #define IP6F_MORE_FRAG      0x0001  /* more-fragments flag */
 100 #else   /* BYTE_ORDER == LITTLE_ENDIAN */
 101 #define IP6F_OFF_MASK       0xf8ff  /* mask out offset from _offlg */
 102 #define IP6F_RESERVED_MASK  0x0600  /* reserved bits in ip6f_offlg */
 103 #define IP6F_MORE_FRAG      0x0100  /* more-fragments flag */
 104 #endif
 105
 106 #endif /* netinet/ip6.h */