TCP header

�@��@TCP�w�b�_�̃t�H�[�}�b�g

�@TCP�Z�O��g�iTCP�p�P�b�g�j�͈ȉ��̒ʂ�uTCP�w�b�_�v�ƁuTCP�y�C��[�h�v�ō\��܂��B
�@TCP�w�b�_�̒��g�͈ȉ��ł��BTCP�y�C��[�h��TCP��ʂ̃v��g�R��܂ރf�[�^�̂��Ƃł��B

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�e�t�B�[��h �r�b�g�� e�t�B�[��h�̐��

��M��|�[�g�ԍ� 16 bit
�@��M��̃|�[�g�ԍ��̒l�B

��|�[�g�ԍ� 16 bit
�@��̃|�[�g�ԍ��̒l�B

�V�[�P��X�ԍ� 32 bit
�@��M��f�[�^�̏��l�B�u��肩��M��m�F��ԍ��v�̒l�B

�m�F��ԍ� 32 bit
�@�m�F��ԍ��̒l�B�u��肩��M��V�[�P��X�ԍ��v�{�u�f�[�^�T�C�Y�v�B

�f�[�^�I�t�Z�b�g 4 bit
�@TCP�w�b�_�̒��l�B

�\�� 3 bit �@�S�r�b�g�u0�v��B��̊g��̂��߂ɗp�ӂ��Ă��B

�R��g��[��t��O 9 bit
�@NS�ACWR�AECE�AURG�AACK�APSH�ARST�ASYN�AFIN��9�r�b�g�ō\��B
�@��̃r�b�g�́u 1 �v�̒l��i�t��O�𗧂Ă�j�ꍇ�ɈӖ��Ȃ��B�@

�E�B��h�E�T�C�Y 16 bit
�@��M��x�Ɏ�M��邱�Ƃ��ł��f�[�^�ʂ𑗐M��ɒʒm��邽�߂�
�@�g�p��B��M��́A��̒l�̃f�[�^�ʂ𒴂��đ��M��邱�Ƃ͂ł��Ȃ��B

�`�F�b�N�T�� 16 bit �@TCP�w�b�_�ƃf�[�^��̃G��[�`�F�b�N��s��߂Ɏg�p��l��B

�ً}�|�C��^ 16 bit
�@�R��g��[��t��O��URG�̒l��u1�v�ł��ꍇ�ɂ̂ݎg�p��t�B�[��h�B
�@�ً}�f�[�^�̊J�n�ʒu��񂪓��B

�I�v�V�� ϒ�
�@TCP�̒ʐM�ɂ��āA��\��コ��邽�߂ɗ��p��B�Ⴆ��
�@TCP�R�l�N�V��̍ۂɁAMSS��肷�邽�߂Ɏg�p��ꂽ�肵�܂��B

�p�f�B��O �ϒ�
�@TCP�w�b�_�̒��32�r�b�g�̐��ɂ��邽�߂�
�@�l�ߕ�(Padding)�Ƃ��ċ�f�[�^�� u 0 �v �̒l��邱�Ƃɂ�蒲��B

�@�ȉ��̕\�́ATCP�w�b�_�̃t�B�[��h�ɂ��u�R��g��[��t��O�v�� 9 bit�̏ڍׂƂȂ�܂��B

�R��g��[��t��O�̏ڍ�

�r�b�g �l��u1�v�ł��i�t��O��Ă��j��̈Ӗ�

�@NS �@ECN-nonce �t�s�ی��B

�@CWR �@�t�s��E�B��h�E�k��iCongestion Window Reduced�j��B

�@ECE �@ECN-Echo ��BSYN�t��O��Z�b�g��Ă��ꍇ�AECN��p�ł��邱�Ƃ��Ӗ��B

�@URG (Urgent) �@�ً}�ɏ��ׂ��f�[�^�܂܂�Ă��邱�Ƃ��B

�@ACK (Acknowledgement) �@�m�F��ԍ��̃t�B�[��h��L��ł��邱�Ƃ��B�ŏ��SYN�ȊO�͏�Ɂu1�v�ƂȂ�B

�@PSH ( Push ) �@��M��f�[�^��o�b�t�@��O��ɁA��ɃA�v��P�[�V��i��ʁj�ɓn��Ƃ��B

�@RST ( Reset ) �@�R�l�N�V��I�ɐؒf��邱�Ƃ��B��炩�ُ̈��o��ꍇ�ɑ��M��B

�@SYN ( Synchronize ) �@�R�l�N�V��̊m��v��邱�Ƃ��B

�@FIN ( Fin ) �@�R�l�N�V��̐��ȏI��v��邱�Ƃ��B

�@��TCP�w�b�_�̒l��TCP�̓��ł��u�|�[�g�ԍ��g�p�v�A�u�R�l�N�V��̊m��A�ێ��ؒf�v
�@�u��v�A�u�đ��v�A�u�E�B��h�E��v�A�u�t��[��v�ŁA��Ɛ��Ă��܂��B