// From Network Programming for Microsoft Windows, Second Edition by 
// Anthony Jones and James Ohlund.  
// Copyright 2002.   Reproduced by permission of Microsoft Press.  
// All rights reserved.
//
//
// Sample: Protocol header definitions used by ping (raw sockets)
// 
// Files:
//      iphdr.h     - this file
//      
// Description:
//      This file contains various protocol header definitions used by
//      the raw socket ping sample.
//
// Compile:
//      See ping.cpp
//
// Usage:
//      See ping.cpp
//

// Align on a 1-byte boundary
#include <pshpack1.h>

// IPv4 header
typedef struct ip_hdr
{
    unsigned char  ip_verlen;        // 4-bit IPv4 version
                                     // 4-bit header length (in 32-bit words)
    unsigned char  ip_tos;           // IP type of service
    unsigned short ip_totallength;   // Total length
    unsigned short ip_id;            // Unique identifier 
    unsigned short ip_offset;        // Fragment offset field
    unsigned char  ip_ttl;           // Time to live
    unsigned char  ip_protocol;      // Protocol(TCP,UDP etc)
    unsigned short ip_checksum;      // IP checksum
    unsigned int   ip_srcaddr;       // Source address
    unsigned int   ip_destaddr;      // Source address
} IPV4_HDR, *PIPV4_HDR, FAR * LPIPV4_HDR;

// IPv4 option header
typedef struct ipv4_option_hdr
{
    unsigned char   opt_code;           // option type
    unsigned char   opt_len;            // length of the option header
    unsigned char   opt_ptr;            // offset into options
    unsigned long   opt_addr[9];        // list of IPv4 addresses
} IPV4_OPTION_HDR, *PIPV4_OPTION_HDR, FAR *LPIPV4_OPTION_HDR;

// ICMP header
typedef struct icmp_hdr
{
    unsigned char   icmp_type;
    unsigned char   icmp_code;
    unsigned short  icmp_checksum;
    unsigned short  icmp_id;
    unsigned short  icmp_sequence;
} ICMP_HDR, *PICMP_HDR, FAR *LPICMP_HDR;

// IPv6 protocol header
typedef struct ipv6_hdr
{
    unsigned long   ipv6_vertcflow;        // 4-bit IPv6 version
                                           // 8-bit traffic class
                                           // 20-bit flow label
    unsigned short  ipv6_payloadlen;       // payload length
    unsigned char   ipv6_nexthdr;          // next header protocol value
    unsigned char   ipv6_hoplimit;         // TTL 
    struct in6_addr ipv6_srcaddr;          // Source address
    struct in6_addr ipv6_destaddr;         // Destination address
} IPV6_HDR, *PIPV6_HDR, FAR * LPIPV6_HDR;

// IPv6 fragment header
typedef struct ipv6_fragment_hdr
{
    unsigned char   ipv6_frag_nexthdr;
    unsigned char   ipv6_frag_reserved;
    unsigned short  ipv6_frag_offset;
    unsigned long   ipv6_frag_id;
} IPV6_FRAGMENT_HDR, *PIPV6_FRAGMENT_HDR, FAR * LPIPV6_FRAGMENT_HDR;

// ICMPv6 header
typedef struct icmpv6_hdr {
    unsigned char   icmp6_type;
    unsigned char   icmp6_code;
    unsigned short  icmp6_checksum;
} ICMPV6_HDR;

// ICMPv6 echo request body
typedef struct icmpv6_echo_request
{
    unsigned short  icmp6_echo_id;
    unsigned short  icmp6_echo_sequence;
} ICMPV6_ECHO_REQUEST;

// Define the UDP header 
typedef struct udp_hdr
{
    unsigned short src_portno;       // Source port no.
    unsigned short dst_portno;       // Dest. port no.
    unsigned short udp_length;       // Udp packet length
    unsigned short udp_checksum;     // Udp checksum (optional)
} UDP_HDR, *PUDP_HDR;

// IPv4 option for record route
#define IP_RECORD_ROUTE     0x7

// ICMP6 protocol value (used in the socket call and IPv6 header)
#define IPPROTO_ICMP6       58

// ICMP types and codes
#define ICMPV4_ECHO_REQUEST_TYPE   8
#define ICMPV4_ECHO_REQUEST_CODE   0
#define ICMPV4_ECHO_REPLY_TYPE     0
#define ICMPV4_ECHO_REPLY_CODE     0
#define ICMPV4_MINIMUM_HEADER      8

// ICPM6 types and codes
#define ICMPV6_ECHO_REQUEST_TYPE   128
#define ICMPV6_ECHO_REQUEST_CODE   0
#define ICMPV6_ECHO_REPLY_TYPE     129
#define ICMPV6_ECHO_REPLY_CODE     0

// Restore byte alignment back to default
#include <poppack.h>