ip.h

此文档为采用FPGA实现的以太网MAC层

#ifndef _IP_H
#define _IP_H

#include "sys.h"
#include "mac.h"

typedef struct
{
    Uint8 version;
    Uint8 service;
    Uint16 packetlength;
    Uint16 ident;
    Uint16 offset;
    Uint8 timetolive;
    Uint8 protocol;
    Uint16 checksum;
    Uint16 sourceip_h;
    Uint16 sourceip_l;
    Uint16 destip_h;
    Uint16 destip_l;
}
IPHEADER;

typedef struct
{
    Uint16 ip_address_h;
    Uint16 ip_address_l;
    Uint8 mac_address[6];
} ARP_ENTRY;

#define ENTRY_SIZE 5
typedef struct
{
    Uint16 index;        //Holds index of next entry to fill out
    ARP_ENTRY entry[ENTRY_SIZE];
} ARP_TABLE;


typedef struct
{
    Uint16 ip_h;
    Uint16 ip_l;
    Uint8 domain[62];
} IP_TABLE_ENTRY;

#define IP_TABLE_ENTRY_COUNT 5
typedef struct
{
    Uint16 index;
    IP_TABLE_ENTRY dns_server;
    IP_TABLE_ENTRY iptable[IP_TABLE_ENTRY_COUNT];
} IP_TABLE;


#define IP_SIZE sizeof(IPHEADER)
#define IP_OFFSET ETH_SIZE

#define PROTOCOL_UDP 0x11
#define PROTOCOL_ICMP 0x1
#define PROTOCOL_TCP 0x6

Uint8 ip_process(IPHEADER *packet, ETHHEADER *eth_header);

//unsigned int ip_packet(unsigned char protocol, unsigned long src_ip, unsigned long dest_ip, unsigned int data_len, unsigned int *packet);
Uint16 ip_packet(IPHEADER *packet, Uint16 data_len);
Uint16 ip_chksum(Uint16 *buf,Uint16 len);
Uint16 ip_chksum2(Uint16 *buf,Uint16 len,Uint16 *buf2,Uint16 len2);
void ip_init(void);
void ip_send(Uint16 dest_ip_h, Uint16 dest_ip_l, Uint16 data_len, Uint8 protocol);
void arptable_add(Uint16 ip_address_h, Uint16 ip_address_l, Uint8 *mac_address);
Uint16 arptable_match(Uint16 ip_address_h, Uint16 ip_address_l);

#endif