iphdr.h

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//
// Sample: Header definitions for raw UDP sample (IP_HDRINCL option)
//
// Files:
//      iphdr.h     - this file
//
// Description:
//      This file contains the header definitions for the IPv4, IPv6, UDP,
//      fragment headers, etc. which are used by the raw UDP sample.
//      
// Compile:
//      See rawudp.cpp
//
// Usage:
//      See rawudp.cpp
//

// Set the packing to a 1 byte boundary
#include <pshpack1.h>

//
// Define the IPv4 header. Make the version and length field one
// character since we can't declare two 4 bit fields without
// the compiler aligning them on at least a 1 byte boundary.
//
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;

// IPv6 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;

//
// 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;

// Restore the byte boundary back to the previous value
#include <poppack.h>