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struct tcphdr { uint16_t th_sport; uint16_t th_dport; uint32_t th_seq; uint32_t th_ack; #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ uint8_t th_off:4; uint8_t _padding0:4; #else uint8_t th_off:4; uint8_t _padding0:4; #endif uint8_t th_flags; uint16_t th_win; uint16_t th_sum; uint16_t th_urp; };