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_internet.h
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#pragma once
#include <stdio.h>
typedef struct EthHeader {
uint8_t dest[6];
uint8_t src[6];
uint16_t ethertype;
} EthHeader;
//以太网类型
namespace EthType
{
extern const uint16_t ARP;
extern const uint16_t IPv4;
}
//IP上层协议
namespace IpProto
{
extern const uint8_t ICMP;
}
//IP头部
struct IpHeader {
#ifdef CPuIS_BIG_ENDIAN
uint8_t version : 4;//ip版本-4位
uint8_t hdrlen : 4;//首部长度-4位
uint8_t tos;//区分服务,一般不使用
uint16_t len;//网络层及以上层数据包总长度
uint16_t id;//标识位
uint16_t flag_offset;//标志位及偏移
uint8_t ttl;//生存时间
uint8_t proto;//协议
uint16_t csum;//首部检验和
uint8_t src[4];//源地址
uint8_t dest[4];//目的地址
#else
uint8_t hdrlen : 4;//首部长度-4位
uint8_t version : 4;//ip版本-4位
uint8_t tos;//区分服务,一般不使用
uint16_t len;//网络层及以上层数据包总长度
uint16_t id;//标识位
uint16_t flag_offset;//标志位及偏移
uint8_t ttl;//生存时间
uint8_t proto;//协议
uint16_t csum;//首部检验和
uint8_t src[4];//源地址
uint8_t dest[4];//目的地址
#endif
};
// ICMP头部
struct IcmpHeader {
uint8_t type;//类型
uint8_t code;//代码
uint16_t csum;//检验和
uint32_t roh;//首部剩余部分
};
struct icmp_ra_addr
{
uint32_t ira_addr;
uint32_t ira_preference;
};
struct icmp
{
uint8_t icmp_type; /* type of message, see below */
uint8_t icmp_code; /* type sub code */
uint16_t icmp_cksum; /* ones complement checksum of struct */
union
{
uint8_t ih_pptr; /* ICMP_PARAMPROB */
//struct in_addr ih_gwaddr; /* gateway address */
struct ih_idseq /* echo datagram */
{
uint16_t icd_id;
uint16_t icd_seq;
} ih_idseq;
uint32_t ih_void;
/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
struct ih_pmtu
{
uint16_t ipm_void;
uint16_t ipm_nextmtu;
} ih_pmtu;
struct ih_rtradv
{
uint8_t irt_num_addrs;
uint8_t irt_wpa;
uint16_t irt_lifetime;
} ih_rtradv;
} icmp_hun; // header union 头部部分联合体
#define icmp_pptr icmp_hun.ih_pptr
#define icmp_gwaddr icmp_hun.ih_gwaddr
#define icmp_id icmp_hun.ih_idseq.icd_id
#define icmp_seq icmp_hun.ih_idseq.icd_seq
#define icmp_void icmp_hun.ih_void
#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
union
{
struct
{
uint32_t its_otime;
uint32_t its_rtime;
uint32_t its_ttime;
} id_ts;
struct icmp_ra_addr id_radv;
uint32_t id_mask;
uint8_t id_data[1];
} icmp_dun; // data union 数据部分联合体
#define icmp_otime icmp_dun.id_ts.its_otime
#define icmp_rtime icmp_dun.id_ts.its_rtime
#define icmp_ttime icmp_dun.id_ts.its_ttime
#define icmp_ip icmp_dun.id_ip.idi_ip
#define icmp_radv icmp_dun.id_radv
#define icmp_mask icmp_dun.id_mask
#define icmp_data icmp_dun.id_data
};
//首部校验和算法
uint16_t CheckSum(uint8_t* packet, int len);
//计算子网前缀长度
int GetMaskLen(uint8_t* mask, int len);