tcp.h

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#ifndef __TCP_H__
#define __TCP_H__
 
#include <list.h>
#include <Net/socket.h>
#include <Net/ipv4.h>
#include <Fs/vfs.h>
 
#define TCP_FLAGS_FIN (1<<0)
#define TCP_FLAGS_SYN (1<<1)
#define TCP_FLAGS_RST (1<<2)
#define TCP_FLAGS_PSH (1<<3)
#define TCP_FLAGS_ACK (1<<4)
#define TCP_FLAGS_URG (1<<5)
#define TCP_FLAGS_ECE (1<<6)
#define TCP_FLAGS_CWR (1<<7)
#define TCP_FLAGS_NS (1<<8)
#define TCP_DATA_OFFSET_5 (0x5 << 12)
 
#define TCP_DEFAULT_WIN_SZ 65535
 
#ifdef ARCH_X64
#pragma pack(push,1)
#endif
typedef struct _tcphead_ {
    unsigned short srcPort;
    unsigned short destPort;
    unsigned sequenceNum;
    unsigned ackNum;
    unsigned short dataOffsetFlags;
    unsigned short window;
    unsigned short checksum;
    unsigned short urgentPointer;
}TCPHeader;
#ifdef ARCH_X64
#pragma pack(pop)
#endif
 
/*
* CreateTCPSocket -- creates a new TCP Socket
*/
extern int CreateTCPSocket();
 
/*
 * TCPGetSocketList -- return the current socket
 * list of TCP
 */
extern list_t* TCPGetSocketList();
 
/*
 * AuTCPAcknowledge -- send ack packets
 * @param nic -- Pointer to NIC device
 * @param sock -- Pointer to session socket
 * @param ippack -- Pointer to IPv4 packet
 * @param payloadLen -- length of the payload
*/
extern int AuTCPAcknowledge(AuVFSNode* nic, AuSocket* sock, IPv4Header* ippack, size_t payloadLen);
 
/*
 * TCPProtocolInstall -- initialize the TCP protocol
 */
extern void TCPProtocolInstall();
 
#endif