epan/dissectors/packet-ipv6.h

   1 /** @file
   2  *
   3  * Wireshark - Network traffic analyzer
   4  * By Gerald Combs <gerald@wireshark.org>
   5  * Copyright 1998 Gerald Combs
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 #ifndef __PACKET_IPV6_H__
  11 #define __PACKET_IPV6_H__
  12
  13 #include <inttypes.h>
  14 #include <wsutil/inet_addr.h>
  15 #include <epan/conversation.h>
  16
  17 #define IPv6_ADDR_SIZE          16
  18 #define IPv6_HDR_SIZE           40
  19 #define IPv6_FRAGMENT_HDR_SIZE  8
  20
  21 /*
  22  * Definition for internet protocol version 6.
  23  * RFC 2460
  24  */
  25 struct ws_ip6_hdr {
  26     uint32_t    ip6h_vc_flow;           /* version, class, flow */
  27     uint16_t    ip6h_plen;              /* payload length */
  28     uint8_t     ip6h_nxt;               /* next header */
  29     uint8_t     ip6h_hlim;              /* hop limit */
  30     ws_in6_addr ip6h_src;               /* source address */
  31     ws_in6_addr ip6h_dst;               /* destination address */
  32 };
  33
  34 /*
  35  * Extension Headers
  36  */
  37
  38 struct ws_ip6_ext {
  39     unsigned char ip6e_nxt;
  40     unsigned char ip6e_len;
  41 };
  42
  43 /* Routing header */
  44 struct ws_ip6_rthdr {
  45     uint8_t ip6r_nxt;        /* next header */
  46     uint8_t ip6r_len;        /* length in units of 8 octets */
  47     uint8_t ip6r_type;       /* routing type */
  48     uint8_t ip6r_segleft;    /* segments left */
  49     /* followed by routing type specific data */
  50 };
  51
  52 /* Type 0 Routing header */
  53 struct ws_ip6_rthdr0 {
  54     uint8_t ip6r0_nxt;       /* next header */
  55     uint8_t ip6r0_len;       /* length in units of 8 octets */
  56     uint8_t ip6r0_type;      /* always zero */
  57     uint8_t ip6r0_segleft;   /* segments left */
  58     uint8_t ip6r0_reserved;  /* reserved field */
  59     uint8_t ip6r0_slmap[3];  /* strict/loose bit map */
  60     /* followed by up to 127 addresses */
  61     ws_in6_addr ip6r0_addr[1];
  62 };
  63
  64 /* Fragment header */
  65 struct ws_ip6_frag {
  66     uint8_t ip6f_nxt;       /* next header */
  67     uint8_t ip6f_reserved;  /* reserved field */
  68     uint16_t ip6f_offlg;     /* offset, reserved, and flag */
  69     uint32_t ip6f_ident;     /* identification */
  70 };
  71
  72 #define IP6F_OFF_MASK           0xfff8 /* mask out offset from _offlg */
  73 #define IP6F_RESERVED_MASK      0x0006 /* reserved bits in ip6f_offlg */
  74 #define IP6F_MORE_FRAG          0x0001 /* more-fragments flag */
  75
  76 struct ipv6_analysis {
  77
  78     /* Initial frame starting this conversation
  79      */
  80     uint32_t initial_frame;
  81
  82     uint32_t stream;
  83 };
  84
  85 WS_DLL_PUBLIC struct ipv6_analysis *get_ipv6_conversation_data(conversation_t *conv,
  86                                 packet_info *pinfo);
  87
  88 #endif