网络协议结构体-02

/*********************************************/

#define ETHER_ADDR_LEN 6 //NIC物理地址占6字节
#define MAXDATA 10240
/*

数据包中的TCP包头,IP包头,UDP包头,ARP包,Ethernet包等.
以及各种表.路由寻址表,地址解析协议表DNS表等
*/

#define ETHERTYPE_IP 0x0800 //IP Protocal
#define ETHERTYPE_ARP 0x0806 //Address Resolution Protocal
#define ETHERTYPE_REVARP 0x0835 //Reverse Address Resolution Protocal 逆地址解析协议
/*********************************************/

//ethernet
typedef struct ether_header
{
u_char ether_dhost[ETHER_ADDR_LEN];
u_char ether_shost[ETHER_ADDR_LEN];
u_short ether_type;
}ETH_HEADER;

//arp
typedef struct arphdr
{
u_short ar_hrd;
u_short ar_pro;
u_char ar_hln;
u_char ar_pln;
u_short ar_op;
}ARP_HEADER;

//IP报头
typedef struct ip
{
u_int ip_v:4; //version(版本)
u_int ip_hl:4; //header length(报头长度)
u_char ip_tos;
u_short ip_len;
u_short ip_id;
u_short ip_off;
u_char ip_ttl;
u_char ip_p;
u_short ip_sum;
struct in_addr ip_src;
struct in_addr ip_dst;
}IP_HEADER;

//TCP报头结构体
typedef struct tcphdr
{
u_short th_sport;
u_short th_dport;
u_int th_seq;
u_int th_ack;
u_int th_off:4;
u_int th_x2:4;
u_char th_flags;
u_short th_win;
u_short th_sum;
u_short th_urp;
}TCP_HEADER;

#define TH_FIN 0x01
#define TH_SYN 0x02
#define TH_RST 0x04
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20

//UDP报头结构体*/
typedef struct udphdr
{
u_short uh_sport;
u_short uh_dport;
u_short uh_ulen;
u_short uh_sum;
}UDP_HEADER;

/*ARP与ETHERNET生成的报头*/
typedef struct ether_arp
{
struct arphdr ea_hdr;
u_char arp_sha[ETHER_ADDR_LEN];
u_char arp_spa[4];
u_char arp_tha[ETHER_ADDR_LEN];
u_char arp_tpa[4];
}ETH_ARP;

#define arp_hrd ea_hdr.ar_hrd
#define arp_pro ea_hdr.ar_pro
#define arp_hln ea_hdr.ar_hln
#define arp_pln ea_hdr.ar_pln
#define arp_op ea_hdr.ar_op
#define ARPHRD 1

//tcp与ip生成的报头
typedef struct packet_tcp
{
struct ip ip;
struct tcphdr tcp;
u_char data[MAXDATA];
}TCP_IP;

//udp与ip生成的报头
typedef struct packet_udp
{
struct ip ip;
struct udphdr udp;
}UDP_IP;

//ICMP的各种形式
//icmpx,x==icmp_type;
//icmp报文(能到达目的地,响应-请求包)
struct icmp8
{
u_char icmp_type; //type of message(报文类型)
u_char icmp_code; //type sub code(报文类型子码)
u_short icmp_cksum;
u_short icmp_id;
u_short icmp_seq;
char icmp_data[1];
};

//icmp报文(能返回目的地,响应-应答包)
struct icmp0
{
u_char icmp_type; //type of message(报文类型)
u_char icmp_code; //type sub code(报文类型子码)
u_short icmp_cksum;
u_short icmp_id;
u_short icmp_seq;
char icmp_data[1];
};

//icmp报文(不能到达目的地)
struct icmp3
{
u_char icmp_type; //type of message(报文类型)
u_char icmp_code; //type sub code(报文类型子码),例如:0网络原因不能到达,1主机原因不能到达...
u_short icmp_cksum;
u_short icmp_pmvoid;
u_short icmp_nextmtu;
char icmp_data[1];
};

//icmp报文(重发结构体)
struct icmp5
{
u_char icmp_type; //type of message(报文类型)
u_char icmp_code; //type sub code(报文类型子码)
u_short icmp_cksum;
struct in_addr icmp_gwaddr;
char icmp_data[1];
};

struct icmp11
{
u_char icmp_type; //type of message(报文类型)
u_char icmp_code; //type sub code(报文类型子码)
u_short icmp_cksum;
u_int icmp_void;
char icmp_data[1];
};