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1.1 ! root 1: /* tcp.h 6.1 83/07/29 */ ! 2: ! 3: typedef u_long tcp_seq; ! 4: /* ! 5: * TCP header. ! 6: * Per RFC 793, September, 1981. ! 7: */ ! 8: struct tcphdr { ! 9: u_short th_sport; /* source port */ ! 10: u_short th_dport; /* destination port */ ! 11: tcp_seq th_seq; /* sequence number */ ! 12: tcp_seq th_ack; /* acknowledgement number */ ! 13: #ifdef vax ! 14: u_char th_x2:4, /* (unused) */ ! 15: th_off:4; /* data offset */ ! 16: #endif ! 17: u_char th_flags; ! 18: #define TH_FIN 0x01 ! 19: #define TH_SYN 0x02 ! 20: #define TH_RST 0x04 ! 21: #define TH_PUSH 0x08 ! 22: #define TH_ACK 0x10 ! 23: #define TH_URG 0x20 ! 24: u_short th_win; /* window */ ! 25: u_short th_sum; /* checksum */ ! 26: u_short th_urp; /* urgent pointer */ ! 27: }; ! 28: ! 29: #define TCPOPT_EOL 0 ! 30: #define TCPOPT_NOP 1 ! 31: #define TCPOPT_MAXSEG 2
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