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< a name = "l1" > < / a > < span class = cF1 > Bool< / span > < span class = cF0 > TCPHandleValidSEQ(CTCPSocket *tcp_socket, CTCPHeader *header, < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_seq_num, < / span > < span class = cF9 > I64< / span > < span class = cF0 > length, < / span > < span class = cF1 > U8< / span > < span class = cF0 > *data)
< a name = "l2" > < / a > {< / span > < span class = cF2 > // returns the value of must_ack, used later in TCPHandleSocket. Copies data to receive buffer.< / span > < span class = cF0 >
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< a name = "l3" > < / a > < / span > < span class = cF1 > Bool< / span > < span class = cF0 > must_ack = < / span > < span class = cF3 > FALSE< / span > < span class = cF0 > ;
< a name = "l4" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > write_position;
< a name = "l5" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > next_position;
< a name = "l6" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > i;
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< a name = "l7" > < / a >
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< a name = "l8" > < / a > < / span > < span class = cF2 > //< / span > < span class = cF0 > < / span > < span class = cF2 > tcp_socket-> send_window = header-> window_size;< / span > < span class = cF0 >
< a name = "l9" > < / a > tcp_socket-> send_window = < / span > < span class = cF5 > EndianU16< / span > < span class = cF0 > (header-> window_size);
< a name = "l10" > < / a > < / span > < span class = cF2 > // Shrine doesn't use EndianU16 (ntohs)? are these all being stored network byte order? ...< / span > < span class = cF0 >
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< a name = "l11" > < / a >
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< a name = "l12" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (tcp_socket-> state)
< a name = "l13" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l14" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_ESTABLISHED:
< a name = "l15" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_FIN_WAIT1:
< a name = "l16" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_FIN_WAIT2: < / span > < span class = cF2 > // FIN2 check is ommitted in Shrine, yet used in below logic. Adding.< / span > < span class = cF0 >
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< a name = "l17" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_CLOSE_WAIT: < / span > < span class = cF2 > // allowing data to be pushed to receive buffer during closing state< / span > < span class = cF0 >
< a name = "l18" > < / a >
< a name = "l19" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLE VALID SEQ: Updating data in receive buffer." < / span > < span class = cF0 > );
< a name = "l20" > < / a >
< a name = "l21" > < / a > < / span > < span class = cF2 > // TODO: review while loops, make sure we DO NOT HANG INTERRUPT HANDLER.< / span > < span class = cF0 >
< a name = "l22" > < / a > write_position = tcp_socket-> write_position;
< a name = "l23" > < / a >
< a name = "l24" > < / a > < / span > < span class = cF1 > while< / span > < span class = cF0 > (length & & segment_seq_num != tcp_socket-> next_recv_seq_num)
< a name = "l25" > < / a > {
< a name = "l26" > < / a > segment_seq_num = (segment_seq_num + < / span > < span class = cFE > 1< / span > < span class = cF0 > ) & < / span > < span class = cFE > 0xFFFFFFFF< / span > < span class = cF0 > ;
< a name = "l27" > < / a > data++;
< a name = "l28" > < / a > length--;
< a name = "l29" > < / a > }
< a name = "l30" > < / a >
< a name = "l31" > < / a > < / span > < span class = cF1 > for< / span > < span class = cF0 > (i = < / span > < span class = cFE > 0< / span > < span class = cF0 > ; i < length; i++)
< a name = "l32" > < / a > {
< a name = "l33" > < / a > < / span > < span class = cF2 > //< / span > < span class = cF0 > < / span > < span class = cF2 > next_position = (write_position + 1) & (tcp_socket-> receive_buffer_size - 1);< / span > < span class = cF0 >
< a name = "l34" > < / a > next_position = (write_position + < / span > < span class = cFE > 1< / span > < span class = cF0 > ) % tcp_socket-> receive_buffer_size;
< a name = "l35" > < / a >
< a name = "l36" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (next_position == tcp_socket-> read_position)
< a name = "l37" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ; < / span > < span class = cF2 > // ...?< / span > < span class = cF0 >
< a name = "l38" > < / a >
< a name = "l39" > < / a > tcp_socket-> receive_buffer[write_position] = data[i];
< a name = "l40" > < / a > write_position = next_position;
< a name = "l41" > < / a > }
< a name = "l42" > < / a >
< a name = "l43" > < / a > tcp_socket-> write_position = write_position;
< a name = "l44" > < / a > tcp_socket-> next_recv_seq_num += i;
< a name = "l45" > < / a >
< a name = "l46" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (i > < / span > < span class = cFE > 0< / span > < span class = cF0 > )
< a name = "l47" > < / a > must_ack = < / span > < span class = cF3 > TRUE< / span > < span class = cF0 > ;
< a name = "l48" > < / a >
< a name = "l49" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_FIN< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l50" > < / a > {
< a name = "l51" > < / a > must_ack = < / span > < span class = cF3 > TRUE< / span > < span class = cF0 > ;
< a name = "l52" > < / a > tcp_socket-> next_recv_seq_num++;
< a name = "l53" > < / a >
< a name = "l54" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (tcp_socket-> state)
< a name = "l55" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l56" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_ESTABLISHED:
< a name = "l57" > < / a > tcp_socket-> state = TCP_STATE_CLOSE_WAIT;
< a name = "l58" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l59" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_FIN_WAIT1:
< a name = "l60" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_FIN_WAIT2:
< a name = "l61" > < / a > tcp_socket-> state = TCP_STATE_TIME_WAIT;
< a name = "l62" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l63" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 > < / span > < span class = cF2 > // review RFC, whether more state checks needed here.< / span > < span class = cF0 >
< a name = "l64" > < / a > }
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< a name = "l65" > < / a >
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< a name = "l66" > < / a >
< a name = "l67" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l68" > < / a >
< a name = "l69" > < / a > < / span > < span class = cF1 > default< / span > < span class = cF0 > :
< a name = "l70" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l71" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l72" > < / a >
< a name = "l73" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > must_ack;
< a name = "l74" > < / a > }
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< a name = "l75" > < / a >
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< a name = "l76" > < / a >
< a name = "l77" > < / a > < / span > < span class = cF1 > Bool< / span > < span class = cF0 > TCPHandleACK(CTCPSocket *tcp_socket, CIPV4Packet *packet, CTCPHeader *header,
< a name = "l78" > < / a > < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_seq_num, < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_ack_num, < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_length)
< a name = "l79" > < / a > { < / span > < span class = cF2 > // returns the value of must_ack, used later in TCPHandleSocket< / span > < span class = cF0 >
< a name = "l80" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > ack_relative;
< a name = "l81" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > ack_next_relative;
< a name = "l82" > < / a >
< a name = "l83" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_ACK< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l84" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l85" > < / a > ack_relative = (segment_ack_num - tcp_socket-> first_unacked_seq) & < / span > < span class = cFE > 0xFFFFFFFF< / span > < span class = cF0 > ;
< a name = "l86" > < / a > ack_next_relative = (tcp_socket-> next_send_seq_num - tcp_socket-> first_unacked_seq) & < / span > < span class = cFE > 0xFFFFFFFF< / span > < span class = cF0 > ;
< a name = "l87" > < / a >
< a name = "l88" > < / a > < / span > < span class = cF2 > // Shrine has comments here about RFC poor wording,< / span > < span class = cF0 >
< a name = "l89" > < / a > < / span > < span class = cF2 > // TODO: review RFC and implement more refined approach.< / span > < span class = cF0 >
< a name = "l90" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (ack_relative < = ack_next_relative)
< a name = "l91" > < / a > {
< a name = "l92" > < / a > TCPAcknowledgePacket(tcp_socket, segment_ack_num);
< a name = "l93" > < / a >
< a name = "l94" > < / a > < / span > < span class = cF2 > // " Accept ACK" < / span > < span class = cF0 >
< a name = "l95" > < / a > tcp_socket-> first_unacked_seq = segment_ack_num;
< a name = "l96" > < / a >
< a name = "l97" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (tcp_socket-> state)
< a name = "l98" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l99" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_SYN_SENT:
< a name = "l100" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLE ACK: Acceptable ACK; state: SYN_SENT" < / span > < span class = cF0 > );
< a name = "l101" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (!< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_SYN< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l102" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l103" > < / a > < / span > < span class = cF2 > // else, fall-through< / span > < span class = cF0 >
< a name = "l104" > < / a >
< a name = "l105" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_SYN_RECEIVED:
< a name = "l106" > < / a > tcp_socket-> state = TCP_STATE_ESTABLISHED;
< a name = "l107" > < / a > tcp_socket-> srtt = < / span > < span class = cF5 > tS< / span > < span class = cF0 > - tcp_socket-> connection_time;
< a name = "l108" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l109" > < / a >
< a name = "l110" > < / a > < / span > < span class = cF1 > default< / span > < span class = cF0 > :
< a name = "l111" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l112" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l113" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLE ACK: Acceptable ACK returning; state: 0x%0X" < / span > < span class = cF0 > , tcp_socket-> state);
< a name = "l114" > < / a > }
< a name = "l115" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l116" > < / a > {
< a name = "l117" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLE SOCKET: Invalid ACK." < / span > < span class = cF0 > );
< a name = "l118" > < / a >
< a name = "l119" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (tcp_socket-> state)
< a name = "l120" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l121" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_LISTEN:
< a name = "l122" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_SYN_SENT:
< a name = "l123" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_SYN_RECEIVED:
< a name = "l124" > < / a > TCPSend(packet-> destination_ip_address,
< a name = "l125" > < / a > < / span > < span class = cF5 > EndianU16< / span > < span class = cF7 > (< / span > < span class = cF0 > header-> destination_port< / span > < span class = cF7 > )< / span > < span class = cF0 > ,
< a name = "l126" > < / a > packet-> source_ip_address,
< a name = "l127" > < / a > < / span > < span class = cF5 > EndianU16< / span > < span class = cF7 > (< / span > < span class = cF0 > header-> source_port< / span > < span class = cF7 > )< / span > < span class = cF0 > ,
< a name = "l128" > < / a > segment_ack_num,
< a name = "l129" > < / a > segment_seq_num + segment_length,
< a name = "l130" > < / a > TCPF_ACK | TCPF_RST);
< a name = "l131" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l132" > < / a >
< a name = "l133" > < / a > < / span > < span class = cF1 > default< / span > < span class = cF0 > :
< a name = "l134" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (IsTCPStateSync< / span > < span class = cF7 > (< / span > < span class = cF0 > tcp_socket< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l135" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > TRUE< / span > < span class = cF0 > ; < / span > < span class = cF2 > // must ACK the packet.< / span > < span class = cF0 >
< a name = "l136" > < / a >
< a name = "l137" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l138" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l139" > < / a > }
< a name = "l140" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l141" > < / a >
< a name = "l142" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > FALSE< / span > < span class = cF0 > ; < / span > < span class = cF2 > // do not need to ACK the packet.< / span > < span class = cF0 >
< a name = "l143" > < / a > }
< a name = "l144" > < / a >
< a name = "l145" > < / a > < / span > < span class = cF1 > Bool< / span > < span class = cF0 > TCPHandleReset(CTCPSocket *tcp_socket, CTCPHeader *header, < / span > < span class = cF1 > Bool< / span > < span class = cF0 > is_seq_valid)
< a name = "l146" > < / a > { < / span > < span class = cF2 > // returns whether or not to stop overall TCP procedure.< / span > < span class = cF0 >
< a name = "l147" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_RST< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l148" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l149" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (tcp_socket-> state)
< a name = "l150" > < / a > {
< a name = "l151" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_SYN_SENT:
< a name = "l152" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (tcp_socket-> first_unacked_seq == tcp_socket-> next_send_seq_num)
< a name = "l153" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l154" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLE SOCKET: Got RST, socket state SYN_SENT. Connection refused." < / span > < span class = cF0 > );
< a name = "l155" > < / a > tcp_socket-> state = TCP_STATE_CLOSED;
< a name = "l156" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > TRUE< / span > < span class = cF0 > ;
< a name = "l157" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l158" > < / a > < / span > < span class = cF1 > break< / span > < span class = cF0 > ;
< a name = "l159" > < / a >
< a name = "l160" > < / a > < / span > < span class = cF1 > default< / span > < span class = cF0 > :
< a name = "l161" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (is_seq_valid)
< a name = "l162" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l163" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLE SOCKET: Got RST, connection refused by remote host." < / span > < span class = cF0 > );
< a name = "l164" > < / a > tcp_socket-> state = TCP_STATE_CLOSED;
< a name = "l165" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > TRUE< / span > < span class = cF0 > ;
< a name = "l166" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l167" > < / a > }
< a name = "l168" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l169" > < / a >
< a name = "l170" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cF3 > FALSE< / span > < span class = cF0 > ;
< a name = "l171" > < / a > }
< a name = "l172" > < / a >
< a name = "l173" > < / a > < / span > < span class = cF1 > U0< / span > < span class = cF0 > TCPHandleSocketListen(CTCPSocket *tcp_socket, CIPV4Packet *packet, CTCPHeader *header, < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_seq_num)
< a name = "l174" > < / a > { < / span > < span class = cF2 > // if SYN and socket listening, queue up the connection in the socket's accept queue.< / span > < span class = cF0 >
< a name = "l175" > < / a > CTCPAcceptQueue *new_connection;
< a name = "l176" > < / a >
< a name = "l177" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_SYN< / span > < span class = cF7 > )< / span > < span class = cF0 > & & < / span > < span class = cF5 > QueueSize< / span > < span class = cF7 > (< / span > < span class = cF0 > tcp_socket-> accept_queue< / span > < span class = cF7 > )< / span > < span class = cF0 > < tcp_socket-> accept_queue_limit)
< a name = "l178" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l179" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLE SOCKET LISTEN: Adding new connection to Socket accept queue" < / span > < span class = cF0 > );
< a name = "l180" > < / a > new_connection = < / span > < span class = cF5 > CAlloc< / span > < span class = cF0 > (< / span > < span class = cF1 > sizeof< / span > < span class = cF7 > (< / span > < span class = cF0 > CTCPAcceptQueue< / span > < span class = cF7 > )< / span > < span class = cF0 > );
< a name = "l181" > < / a >
< a name = "l182" > < / a > new_connection-> segment_seq_num = segment_seq_num;
< a name = "l183" > < / a > new_connection-> ipv4_address = packet-> source_ip_address;
< a name = "l184" > < / a > new_connection-> port = header-> source_port;
< a name = "l185" > < / a >
< a name = "l186" > < / a > < / span > < span class = cF5 > QueueInsertRev< / span > < span class = cF0 > (new_connection, tcp_socket-> accept_queue);
< a name = "l187" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l188" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l189" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 > < / span > < span class = cF2 > // refuse< / span > < span class = cF0 >
< a name = "l190" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLE SOCKET LISTEN: Header flags not SYN or Queue full, REFUSING CONNECTION" < / span > < span class = cF0 > );
< a name = "l191" > < / a > TCPSend(packet-> destination_ip_address,
< a name = "l192" > < / a > < / span > < span class = cF5 > EndianU16< / span > < span class = cF7 > (< / span > < span class = cF0 > header-> destination_port< / span > < span class = cF7 > )< / span > < span class = cF0 > ,
< a name = "l193" > < / a > packet-> source_ip_address,
< a name = "l194" > < / a > < / span > < span class = cF5 > EndianU16< / span > < span class = cF7 > (< / span > < span class = cF0 > header-> source_port< / span > < span class = cF7 > )< / span > < span class = cF0 > ,
2021-07-04 23:11:34 +01:00
< a name = "l195" > < / a > segment_seq_num + < / span > < span class = cFE > 1< / span > < span class = cF0 > ,
2021-11-30 04:50:05 +00:00
< a name = "l196" > < / a > segment_seq_num + < / span > < span class = cFE > 1< / span > < span class = cF0 > ,
< a name = "l197" > < / a > TCPF_ACK | TCPF_RST);
< a name = "l198" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l199" > < / a > }
< a name = "l200" > < / a >
< a name = "l201" > < / a > < / span > < span class = cF1 > U0< / span > < span class = cF0 > TCPHandleSocket(CTCPSocket *tcp_socket, CIPV4Packet *packet, CTCPHeader *header, < / span > < span class = cF1 > U8< / span > < span class = cF0 > *data, < / span > < span class = cF9 > I64< / span > < span class = cF0 > length)
< a name = "l202" > < / a > {
< a name = "l203" > < / a > < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_length = length;
< a name = "l204" > < / a > < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_seq_num = < / span > < span class = cF5 > EndianU32< / span > < span class = cF0 > (header-> seq_num);
< a name = "l205" > < / a > < / span > < span class = cF9 > U32< / span > < span class = cF0 > segment_ack_num = < / span > < span class = cF5 > EndianU32< / span > < span class = cF0 > (header-> ack_num);
< a name = "l206" > < / a > < / span > < span class = cF1 > Bool< / span > < span class = cF0 > must_ack = < / span > < span class = cF3 > FALSE< / span > < span class = cF0 > ;
< a name = "l207" > < / a > < / span > < span class = cF1 > Bool< / span > < span class = cF0 > is_seq_valid = < / span > < span class = cF3 > FALSE< / span > < span class = cF0 > ;
< a name = "l208" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > seq_relative;
< a name = "l209" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > seq_end_relative;
< a name = "l210" > < / a >
< a name = "l211" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_FIN< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l212" > < / a > segment_length++;
< a name = "l213" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_SYN< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l214" > < / a > segment_length++;
< a name = "l215" > < / a >
< a name = "l216" > < / a > < / span > < span class = cF1 > switch< / span > < span class = cF0 > (tcp_socket-> state)
< a name = "l217" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l218" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_LISTEN:
< a name = "l219" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLE SOCKET: Running TCP HANDLE SOCKET LISTEN" < / span > < span class = cF0 > );
< a name = "l220" > < / a > TCPHandleSocketListen(tcp_socket, packet, header, segment_seq_num);
< a name = "l221" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > ;
< a name = "l222" > < / a >
< a name = "l223" > < / a > < / span > < span class = cF1 > case< / span > < span class = cF0 > TCP_STATE_CLOSED:
< a name = "l224" > < / a > NetErr(< / span > < span class = cF6 > " TCP HANDLE SOCKET: Received packet but TCP Socket is CLOSED." < / span > < span class = cF0 > );
< a name = "l225" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > ;
< a name = "l226" > < / a >
< a name = "l227" > < / a > < / span > < span class = cF1 > default< / span > < span class = cF0 > :
< a name = "l228" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_SYN< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l229" > < / a > {
< a name = "l230" > < / a > tcp_socket-> next_recv_seq_num = ++segment_seq_num;
< a name = "l231" > < / a >
< a name = "l232" > < / a > must_ack = < / span > < span class = cF3 > TRUE< / span > < span class = cF0 > ;
< a name = "l233" > < / a > }
< a name = "l234" > < / a >
< a name = "l235" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (segment_length == < / span > < span class = cFE > 0< / span > < span class = cF0 > & & tcp_socket-> receive_window == < / span > < span class = cFE > 0< / span > < span class = cF0 > )
< a name = "l236" > < / a > {
< a name = "l237" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLE SOCKET: segment length == 0 & & receive window == 0, SEQ valid if seq == next recv seq" < / span > < span class = cF0 > );
< a name = "l238" > < / a > is_seq_valid = (segment_seq_num == tcp_socket-> next_recv_seq_num);
< a name = "l239" > < / a > }
< a name = "l240" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l241" > < / a > {
< a name = "l242" > < / a > seq_relative = (segment_seq_num - tcp_socket-> next_recv_seq_num) & < / span > < span class = cFE > 0xFFFFFFFF< / span > < span class = cF0 > ;
< a name = "l243" > < / a > seq_end_relative = (segment_seq_num + segment_length - < / span > < span class = cFE > 1< / span > < span class = cF0 > - tcp_socket-> next_recv_seq_num) & < / span > < span class = cFE > 0xFFFFFFFF< / span > < span class = cF0 > ;
< a name = "l244" > < / a >
< a name = "l245" > < / a > is_seq_valid = (seq_relative < tcp_socket-> receive_window ||
< a name = "l246" > < / a > seq_end_relative < tcp_socket-> receive_window);
< a name = "l247" > < / a > }
< a name = "l248" > < / a >
< a name = "l249" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (!is_seq_valid)
< a name = "l250" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLE SOCKET: Invalid SEQ." < / span > < span class = cF0 > );
< a name = "l251" > < / a >
< a name = "l252" > < / a > must_ack |= TCPHandleACK(tcp_socket, packet, header, segment_seq_num, segment_ack_num, segment_length);
2021-07-03 05:07:57 +01:00
< a name = "l253" > < / a >
2021-11-30 04:50:05 +00:00
< a name = "l254" > < / a >
< a name = "l255" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (TCPHandleReset< / span > < span class = cF7 > (< / span > < span class = cF0 > tcp_socket, header, is_seq_valid< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l256" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > ;
< a name = "l257" > < / a >
< a name = "l258" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (is_seq_valid)
< a name = "l259" > < / a > must_ack |= TCPHandleValidSEQ(tcp_socket, header, segment_seq_num, length, data);
< a name = "l260" > < / a >
< a name = "l261" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (must_ack)
< a name = "l262" > < / a > TCPSendFlags(tcp_socket, TCPF_ACK);
< a name = "l263" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l264" > < / a >
< a name = "l265" > < / a > }
< a name = "l266" > < / a >
< a name = "l267" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > TCPHandleRefuse(CIPV4Packet *packet, CTCPHeader *header, < / span > < span class = cF9 > I64< / span > < span class = cF0 > length)
< a name = "l268" > < / a > {
< a name = "l269" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > de_index;
< a name = "l270" > < / a > < / span > < span class = cF9 > U32< / span > < span class = cF0 > ack_num = < / span > < span class = cF5 > EndianU32< / span > < span class = cF0 > (header-> ack_num);
< a name = "l271" > < / a > < / span > < span class = cF9 > U32< / span > < span class = cF0 > seq_num = < / span > < span class = cF5 > EndianU32< / span > < span class = cF0 > (header-> seq_num);
< a name = "l272" > < / a >
< a name = "l273" > < / a > < / span > < span class = cF1 > no_warn< / span > < span class = cF0 > length; < / span > < span class = cF2 > // TODO: Will reset generation need length ?< / span > < span class = cF0 >
< a name = "l274" > < / a >
< a name = "l275" > < / a > ack_num = ++seq_num;
< a name = "l276" > < / a > seq_num = < / span > < span class = cFE > 0< / span > < span class = cF0 > ;
< a name = "l277" > < / a >
< a name = "l278" > < / a > < / span > < span class = cF2 > // review RFC Reset-Generation ...< / span > < span class = cF0 >
< a name = "l279" > < / a >
< a name = "l280" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (< / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_RST< / span > < span class = cF7 > )< / span > < span class = cF0 > & & < / span > < span class = cF5 > Bt< / span > < span class = cF7 > (< / span > < span class = cF0 > & header-> flags, TCPf_ACK< / span > < span class = cF7 > )< / span > < span class = cF0 > )
< a name = "l281" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cFE > 0< / span > < span class = cF0 > ; < / span > < span class = cF2 > // bail: we probably sent an RST earlier, and this is the acknowledgement< / span > < span class = cF0 >
< a name = "l282" > < / a >
< a name = "l283" > < / a > de_index = TCPSend(packet-> destination_ip_address,
< a name = "l284" > < / a > < / span > < span class = cF5 > EndianU16< / span > < span class = cF7 > (< / span > < span class = cF0 > header-> destination_port< / span > < span class = cF7 > )< / span > < span class = cF0 > ,
< a name = "l285" > < / a > packet-> source_ip_address,
< a name = "l286" > < / a > < / span > < span class = cF5 > EndianU16< / span > < span class = cF7 > (< / span > < span class = cF0 > header-> source_port< / span > < span class = cF7 > )< / span > < span class = cF0 > ,
< a name = "l287" > < / a > seq_num,
< a name = "l288" > < / a > ack_num,
< a name = "l289" > < / a > TCPF_RST | TCPF_ACK);
< a name = "l290" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (de_index < < / span > < span class = cFE > 0< / span > < span class = cF0 > )
< a name = "l291" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l292" > < / a > NetErr(< / span > < span class = cF6 > " TCP Handler Refuse: TCP Send failed." < / span > < span class = cF0 > );
< a name = "l293" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > de_index;
< a name = "l294" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l295" > < / a >
< a name = "l296" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cFE > 0< / span > < span class = cF0 > ;
< a name = "l297" > < / a > }
< a name = "l298" > < / a >
< a name = "l299" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > TCPHandler(CIPV4Packet *packet)
< a name = "l300" > < / a > {
< a name = "l301" > < / a > CTCPHeader *header;
< a name = "l302" > < / a > < / span > < span class = cF9 > U16< / span > < span class = cF0 > destination_port;
< a name = "l303" > < / a > < / span > < span class = cF1 > U8< / span > < span class = cF0 > *data;
< a name = "l304" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > length;
< a name = "l305" > < / a > CTCPTreeNode *head = tcp_globals.bound_socket_tree;
< a name = "l306" > < / a > CTCPTreeNode *node;
< a name = "l307" > < / a > CTCPTreeQueue *queue;
< a name = "l308" > < / a > CTCPSocket *tcp_socket;
< a name = "l309" > < / a > < / span > < span class = cF9 > I64< / span > < span class = cF0 > error = TCPPacketParse(& header, & data, & length, packet);
< a name = "l310" > < / a >
< a name = "l311" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (error < < / span > < span class = cFE > 0< / span > < span class = cF0 > )
< a name = "l312" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l313" > < / a > NetErr(< / span > < span class = cF6 > " TCP HANDLER: Packet Parse Error." < / span > < span class = cF0 > );
< a name = "l314" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > error;
< a name = "l315" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l316" > < / a >
< a name = "l317" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLER: Caught packet with dest port of %0X (B.E.)" < / span > < span class = cF0 > , header-> destination_port);
< a name = "l318" > < / a >
< a name = "l319" > < / a > destination_port = < / span > < span class = cF5 > EndianU16< / span > < span class = cF0 > (header-> destination_port); < / span > < span class = cF2 > // B.E. -> L.E.< / span > < span class = cF0 >
< a name = "l320" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLER: Caught packet with dest port of %0X (L.E.)" < / span > < span class = cF0 > , destination_port);
< a name = "l321" > < / a >
< a name = "l322" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (head)
< a name = "l323" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l324" > < / a > node = TCPTreeNodeFind(destination_port, head);
< a name = "l325" > < / a >
< a name = "l326" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (node)
< a name = "l327" > < / a > {
< a name = "l328" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLER: Found node for port, looking for address %0X (L.E.)" < / span > < span class = cF0 > , packet-> source_ip_address);
< a name = "l329" > < / a > queue = TCPTreeNodeQueueIPV4Find(packet-> source_ip_address, node); < / span > < span class = cF2 > // TODO: make sure bit order is correct here!!< / span > < span class = cF0 >
< a name = "l330" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (queue)
< a name = "l331" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l332" > < / a > tcp_socket = queue-> socket;
< a name = "l333" > < / a > NetLog(< / span > < span class = cF6 > " TCP HANDLER: Port and Address are in bound tree." < / span > < span class = cF0 > );
< a name = "l334" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l335" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l336" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l337" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLER: Found node for port, but address is not in node queue." < / span > < span class = cF0 > );
< a name = "l338" > < / a > NetWarn(< / span > < span class = cF6 > " TCP source ip: 0x%0X." < / span > < span class = cF0 > , packet-> source_ip_address);
< a name = "l339" > < / a >
< a name = "l340" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLER: Sending TCP RST ACK packet. Refusing connection." < / span > < span class = cF0 > );
< a name = "l341" > < / a > TCPHandleRefuse(packet, header, length);
< a name = "l342" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > -< / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l343" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l344" > < / a > }
< a name = "l345" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l346" > < / a > {
< a name = "l347" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLER: NODE SEARCH FAILURE: PORT %0X" < / span > < span class = cF0 > , destination_port);
< a name = "l348" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLER: Node for Port is not in tree." < / span > < span class = cF0 > );
< a name = "l349" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLER: Sending TCP RST ACK packet. Refusing connection." < / span > < span class = cF0 > );
< a name = "l350" > < / a > TCPHandleRefuse(packet, header, length);
< a name = "l351" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > -< / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l352" > < / a > }
< a name = "l353" > < / a >
< a name = "l354" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l355" > < / a > < / span > < span class = cF1 > else< / span > < span class = cF0 >
< a name = "l356" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l357" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLER: Socket tree is currently empty." < / span > < span class = cF0 > );
< a name = "l358" > < / a > NetWarn(< / span > < span class = cF6 > " TCP HANDLER: Sending TCP RST ACK packet. Refusing connection." < / span > < span class = cF0 > );
< a name = "l359" > < / a > TCPHandleRefuse(packet, header, length);
< a name = "l360" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > -< / span > < span class = cFE > 1< / span > < span class = cF0 > ;
< a name = "l361" > < / a > < / span > < span class = cF7 > }< / span > < span class = cF0 >
< a name = "l362" > < / a >
< a name = "l363" > < / a > < / span > < span class = cF2 > // at this point, tcp_socket is set, otherwise has already returned -1.< / span > < span class = cF0 >
< a name = "l364" > < / a >
< a name = "l365" > < / a > NetDebug(< / span > < span class = cF6 > " TCP HANDLER: Running TCP HANDLE SOCKET" < / span > < span class = cF0 > );
< a name = "l366" > < / a > TCPHandleSocket(tcp_socket, packet, header, data, length);
< a name = "l367" > < / a >
< a name = "l368" > < / a > }
< / span > < / pre > < / body >
2021-07-03 05:07:57 +01:00
< / html >
