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// TCP control bits
#ifndef _TCPIP_
#define _TCPIP_
#define TH_SYN 0x02 // Synchronize sequence numbers
#define TH_FIN 0x01 // Sender has reached end of his stream
#define TH_RST 0x04 // Reset the connection
#define TH_PUSH 0x08 // Push data to above level
#define TH_ACK 0x10 // Acknowledgement field is valid
#define TH_URG 0x20 // Urgent pointer is valid
struct tcphdr {
USHORT th_sport;
USHORT th_dport;
ULONG th_seq;
ULONG th_ack;
UCHAR th_off;
UCHAR th_flags;
USHORT th_win;
UCHAR th_sumhi;
UCHAR th_sumlo;
USHORT th_urp;
UCHAR th_data[1];
};
#define IP_ALEN 4
typedef struct IPaddr {
ULONG s_addr;
} IPaddr;
#define IPPROTO_TCP 6
struct ip {
UCHAR ip_hl;
UCHAR ip_tos;
USHORT ip_len;
USHORT ip_id;
USHORT ip_off;
UCHAR ip_ttl;
UCHAR ip_p;
USHORT ip_sum;
IPaddr ip_src;
IPaddr ip_dst;
UCHAR ip_data[1];
};
typedef struct ip IPHeader, *PIPHeader;
#endif // _TCPIP_
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