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TomAwezome a879d1a330 Update docs.
2021-12-30 22:21:33 -05:00

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<pre style="font-family:monospace;font-size:12pt">
<a name="l1"></a><span class=cF0>
<a name="l2"></a></span><span class=cF1>U0</span><span class=cF0> TCPGlobalsInit()
<a name="l3"></a>{
<a name="l4"></a> tcp_globals.bound_socket_tree = </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l5"></a> tcp_globals.next_source_port = </span><span class=cFE>0</span><span class=cF0>;
<a name="l6"></a>}
<a name="l7"></a>
<a name="l8"></a></span><span class=cF1>Bool</span><span class=cF0> IsTCPStateSync(CTCPSocket *tcp_socket)
<a name="l9"></a>{
<a name="l10"></a> </span><span class=cF1>switch</span><span class=cF0> (tcp_socket-&gt;state)
<a name="l11"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l12"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_ESTABLISHED:
<a name="l13"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_FIN_WAIT1:
<a name="l14"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_FIN_WAIT2:
<a name="l15"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_CLOSE_WAIT:
<a name="l16"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_CLOSING:
<a name="l17"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_LAST_ACK:
<a name="l18"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_TIME_WAIT:
<a name="l19"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>TRUE</span><span class=cF0>;
<a name="l20"></a> </span><span class=cF1>default</span><span class=cF0>:
<a name="l21"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>FALSE</span><span class=cF0>;
<a name="l22"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l23"></a>}
<a name="l24"></a>
<a name="l25"></a></span><span class=cF2>// TODO: Merge IPV4Checksum, TCPChecksumPartial, and TCPChecksumFinal into 1.</span><span class=cF0>
<a name="l26"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2> All use same alg.</span><span class=cF0>
<a name="l27"></a></span><span class=cF9>U16</span><span class=cF0> TCPChecksumPartial(</span><span class=cF9>U32</span><span class=cF0> sum, </span><span class=cF1>U8</span><span class=cF0> *header, </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l28"></a>{ </span><span class=cF2>// same algorithm as IPV4Checksum, except sum is arg. First half.</span><span class=cF0>
<a name="l29"></a> </span><span class=cF2>//todo. make names clearer, and better comments.</span><span class=cF0>
<a name="l30"></a> </span><span class=cF9>I64</span><span class=cF0> nleft = length;
<a name="l31"></a> </span><span class=cF9>U16</span><span class=cF0> *w = header;
<a name="l32"></a>
<a name="l33"></a> </span><span class=cF1>while</span><span class=cF0> (nleft &gt; </span><span class=cFE>1</span><span class=cF0>)
<a name="l34"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l35"></a> sum += *w++;
<a name="l36"></a> nleft -= </span><span class=cFE>2</span><span class=cF0>;
<a name="l37"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l38"></a>
<a name="l39"></a> </span><span class=cF1>return</span><span class=cF0> sum;
<a name="l40"></a>}
<a name="l41"></a>
<a name="l42"></a></span><span class=cF9>U16</span><span class=cF0> TCPChecksumFinal(</span><span class=cF9>U32</span><span class=cF0> sum, </span><span class=cF1>U8</span><span class=cF0> *header, </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l43"></a>{ </span><span class=cF2>// same algorithm as IPV4Checksum, except sum is arg. Both halves.</span><span class=cF0>
<a name="l44"></a> </span><span class=cF2>//todo. make names clearer, and better comments.</span><span class=cF0>
<a name="l45"></a> </span><span class=cF9>I64</span><span class=cF0> nleft = length;
<a name="l46"></a> </span><span class=cF9>U16</span><span class=cF0> *w = header;
<a name="l47"></a>
<a name="l48"></a> </span><span class=cF1>while</span><span class=cF0> (nleft &gt; </span><span class=cFE>1</span><span class=cF0>)
<a name="l49"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l50"></a> sum += *w++;
<a name="l51"></a> nleft -= </span><span class=cFE>2</span><span class=cF0>;
<a name="l52"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l53"></a>
<a name="l54"></a> </span><span class=cF2>// &quot;mop up an odd byte, if necessary&quot;</span><span class=cF0>
<a name="l55"></a> </span><span class=cF1>if</span><span class=cF0> (nleft == </span><span class=cFE>1</span><span class=cF0>)
<a name="l56"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l57"></a> sum += *w &amp; </span><span class=cFE>0x00FF</span><span class=cF0>;
<a name="l58"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l59"></a>
<a name="l60"></a> </span><span class=cF2>// &quot;add back carry outs from top 16 bits to low 16 bits&quot;</span><span class=cF0>
<a name="l61"></a> sum = sum &gt;&gt; </span><span class=cFE>16</span><span class=cF0> + sum &amp; </span><span class=cFE>0xFFFF</span><span class=cF0>; </span><span class=cF2>// &quot;add hi 16 to low 16&quot;</span><span class=cF0>
<a name="l62"></a> sum += sum &gt;&gt; </span><span class=cFE>16</span><span class=cF0>; </span><span class=cF2>// add carry</span><span class=cF0>
<a name="l63"></a> </span><span class=cF1>return</span><span class=cF0> ~sum &amp; </span><span class=cFE>0xFFFF</span><span class=cF0>;
<a name="l64"></a>
<a name="l65"></a>}
<a name="l66"></a>
<a name="l67"></a></span><span class=cF9>I64</span><span class=cF0> TCPPacketAllocate(</span><span class=cF1>U8</span><span class=cF0> **frame_out,
<a name="l68"></a> </span><span class=cF9>U32</span><span class=cF0> source_ip,
<a name="l69"></a> </span><span class=cF9>U16</span><span class=cF0> source_port,
<a name="l70"></a> </span><span class=cF9>U32</span><span class=cF0> destination_ip,
<a name="l71"></a> </span><span class=cF9>U16</span><span class=cF0> destination_port,
<a name="l72"></a> </span><span class=cF9>U32</span><span class=cF0> seq_num,
<a name="l73"></a> </span><span class=cF9>U32</span><span class=cF0> ack_num,
<a name="l74"></a> </span><span class=cF1>U8</span><span class=cF0> flags,
<a name="l75"></a> </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l76"></a>{
<a name="l77"></a> </span><span class=cF1>U8</span><span class=cF0> *tcp_frame;
<a name="l78"></a> </span><span class=cF9>I64</span><span class=cF0> de_index;
<a name="l79"></a> CTCPHeader *header;
<a name="l80"></a>
<a name="l81"></a> de_index = IPV4PacketAllocate(&amp;tcp_frame,
<a name="l82"></a> IP_PROTOCOL_TCP,
<a name="l83"></a> source_ip,
<a name="l84"></a> destination_ip,
<a name="l85"></a> </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPHeader</span><span class=cF7>)</span><span class=cF0> + length);
<a name="l86"></a> </span><span class=cF1>if</span><span class=cF0> (de_index &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l87"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l88"></a> NetLog(</span><span class=cF6>&quot;TCP PACKET ALLOCATE: Ethernet Frame Allocate failed.&quot;</span><span class=cF0>);
<a name="l89"></a> </span><span class=cF1>return</span><span class=cF0> de_index;
<a name="l90"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l91"></a>
<a name="l92"></a> header = tcp_frame;
<a name="l93"></a>
<a name="l94"></a> header-&gt;source_port = </span><span class=cF5>EndianU16</span><span class=cF0>(source_port);
<a name="l95"></a> header-&gt;destination_port = </span><span class=cF5>EndianU16</span><span class=cF0>(destination_port);
<a name="l96"></a>
<a name="l97"></a> NetDebug(</span><span class=cF6>&quot;TCP PACKET ALLOCATE: Outputting header port src/dest 0x%0X/0x%0X:&quot;</span><span class=cF0>,
<a name="l98"></a> header-&gt;source_port, header-&gt;destination_port);
<a name="l99"></a>
<a name="l100"></a> header-&gt;seq_num = </span><span class=cF5>EndianU32</span><span class=cF0>(seq_num);
<a name="l101"></a> header-&gt;ack_num = </span><span class=cF5>EndianU32</span><span class=cF0>(ack_num);
<a name="l102"></a> header-&gt;data_offset = (</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPHeader</span><span class=cF7>)</span><span class=cF0> / </span><span class=cFE>4</span><span class=cF0>) &lt;&lt; </span><span class=cFE>4</span><span class=cF0>; </span><span class=cF2>// ???</span><span class=cF0>
<a name="l103"></a> header-&gt;flags = flags;
<a name="l104"></a> header-&gt;window_size = </span><span class=cF5>EndianU16</span><span class=cF0>(TCP_WINDOW_SIZE / </span><span class=cFE>2</span><span class=cF0>);</span><span class=cF2>// TODO: What is window size supposed to be ?</span><span class=cF0>
<a name="l105"></a> header-&gt;checksum = </span><span class=cFE>0</span><span class=cF0>;
<a name="l106"></a> header-&gt;urgent_pointer = </span><span class=cFE>0</span><span class=cF0>;
<a name="l107"></a>
<a name="l108"></a> *frame_out = tcp_frame + </span><span class=cF1>sizeof</span><span class=cF0>(CTCPHeader);
<a name="l109"></a>
<a name="l110"></a> </span><span class=cF1>return</span><span class=cF0> de_index;
<a name="l111"></a>}
<a name="l112"></a>
<a name="l113"></a></span><span class=cF1>U0</span><span class=cF0> TCPPacketFinish(</span><span class=cF9>I64</span><span class=cF0> de_index,
<a name="l114"></a> </span><span class=cF9>U32</span><span class=cF0> source_ip,
<a name="l115"></a> </span><span class=cF9>U32</span><span class=cF0> destination_ip,
<a name="l116"></a> </span><span class=cF1>U8</span><span class=cF0> *frame,
<a name="l117"></a> </span><span class=cF9>I64</span><span class=cF0> length,
<a name="l118"></a> CTCPAckQueue **send_buffer_out=</span><span class=cF3>NULL</span><span class=cF0>)
<a name="l119"></a>{
<a name="l120"></a> CTCPHeader *header = frame - </span><span class=cF1>sizeof</span><span class=cF0>(CTCPHeader);
<a name="l121"></a> CTCPPseudoHeader *pseudoheader = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPPseudoHeader</span><span class=cF7>)</span><span class=cF0>);
<a name="l122"></a> </span><span class=cF9>U32</span><span class=cF0> checksum;
<a name="l123"></a> CTCPAckQueue *send_buffer;
<a name="l124"></a>
<a name="l125"></a> pseudoheader-&gt;source_address = </span><span class=cF5>EndianU32</span><span class=cF0>(source_ip);
<a name="l126"></a> pseudoheader-&gt;destination_address = </span><span class=cF5>EndianU32</span><span class=cF0>(destination_ip);
<a name="l127"></a> pseudoheader-&gt;zeros = </span><span class=cFE>0</span><span class=cF0>;
<a name="l128"></a> pseudoheader-&gt;protocol = IP_PROTOCOL_TCP;
<a name="l129"></a> pseudoheader-&gt;tcp_length = </span><span class=cF5>EndianU16</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPHeader</span><span class=cF7>)</span><span class=cF0> + length);
<a name="l130"></a>
<a name="l131"></a> checksum = TCPChecksumPartial(</span><span class=cFE>0</span><span class=cF0>, pseudoheader, </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPPseudoHeader</span><span class=cF7>)</span><span class=cF0>);
<a name="l132"></a> header-&gt;checksum = TCPChecksumFinal(checksum, header, </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPHeader</span><span class=cF7>)</span><span class=cF0> + length);
<a name="l133"></a>
<a name="l134"></a> </span><span class=cF1>if</span><span class=cF0> (send_buffer_out)
<a name="l135"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l136"></a> send_buffer = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPAckQueue</span><span class=cF7>)</span><span class=cF0>);
<a name="l137"></a>
<a name="l138"></a> send_buffer-&gt;time_sent = </span><span class=cF5>tS</span><span class=cF0>;
<a name="l139"></a> send_buffer-&gt;retries = </span><span class=cFE>0</span><span class=cF0>;
<a name="l140"></a> send_buffer-&gt;start_seq_num = </span><span class=cF5>EndianU32</span><span class=cF0>(header-&gt;seq_num);
<a name="l141"></a> send_buffer-&gt;end_seq_num = </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>// must set this upstream</span><span class=cF0>
<a name="l142"></a> send_buffer-&gt;tcp_packet_size = length;
<a name="l143"></a> send_buffer-&gt;tcp_packet = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPHeader</span><span class=cF7>)</span><span class=cF0> + length);
<a name="l144"></a>
<a name="l145"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(send_buffer-&gt;tcp_packet, frame, </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPHeader</span><span class=cF7>)</span><span class=cF0> + length);
<a name="l146"></a>
<a name="l147"></a> *send_buffer_out = send_buffer; </span><span class=cF2>// set output param as new send buffer</span><span class=cF0>
<a name="l148"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l149"></a>
<a name="l150"></a> IPV4PacketFinish(de_index);
<a name="l151"></a>}
<a name="l152"></a>
<a name="l153"></a></span><span class=cF9>I64</span><span class=cF0> TCPSend(</span><span class=cF9>U32</span><span class=cF0> source_ip,
<a name="l154"></a> </span><span class=cF9>U16</span><span class=cF0> source_port,
<a name="l155"></a> </span><span class=cF9>U32</span><span class=cF0> destination_ip,
<a name="l156"></a> </span><span class=cF9>U16</span><span class=cF0> destination_port,
<a name="l157"></a> </span><span class=cF9>U32</span><span class=cF0> seq_num,
<a name="l158"></a> </span><span class=cF9>U32</span><span class=cF0> ack_num,
<a name="l159"></a> </span><span class=cF1>U8</span><span class=cF0> flags)
<a name="l160"></a>{ </span><span class=cF2>// send raw unsocketed TCP packet, flags and/or data. Does not store into ACK Queue (Send Buffer).</span><span class=cF0>
<a name="l161"></a>
<a name="l162"></a> </span><span class=cF1>U8</span><span class=cF0> *payload_frame;
<a name="l163"></a> </span><span class=cF9>I64</span><span class=cF0> de_index = TCPPacketAllocate(&amp;payload_frame,
<a name="l164"></a> source_ip,
<a name="l165"></a> source_port,
<a name="l166"></a> destination_ip,
<a name="l167"></a> destination_port,
<a name="l168"></a> seq_num,
<a name="l169"></a> ack_num,
<a name="l170"></a> flags,
<a name="l171"></a> </span><span class=cFE>0</span><span class=cF0>);
<a name="l172"></a> </span><span class=cF1>if</span><span class=cF0> (de_index &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l173"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l174"></a> NetErr(</span><span class=cF6>&quot;TCP SEND: TCP Packet Allocate failed.&quot;</span><span class=cF0>);
<a name="l175"></a> </span><span class=cF1>return</span><span class=cF0> de_index;
<a name="l176"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l177"></a>
<a name="l178"></a> TCPPacketFinish(de_index, source_ip, destination_ip, payload_frame, </span><span class=cFE>0</span><span class=cF0>, </span><span class=cF3>NULL</span><span class=cF0>);
<a name="l179"></a>
<a name="l180"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l181"></a>}
<a name="l182"></a>
<a name="l183"></a></span><span class=cF9>I64</span><span class=cF0> TCPSendFlags(CTCPSocket *tcp_socket, </span><span class=cF1>U8</span><span class=cF0> flags)
<a name="l184"></a>{ </span><span class=cF2>// send TCP packet, flags only. Stores into ACK Queue (Send Buffer) if flags SYN or FIN.</span><span class=cF0>
<a name="l185"></a>
<a name="l186"></a> </span><span class=cF1>U8</span><span class=cF0> *payload_frame;
<a name="l187"></a> CSocketAddressStorage *dest = &amp;tcp_socket-&gt;destination_address;
<a name="l188"></a> CSocketAddressStorage *source = &amp;tcp_socket-&gt;source_address;
<a name="l189"></a> CSocketAddressIPV4 *dest_ipv4;
<a name="l190"></a> CSocketAddressIPV6 *dest_ipv6;
<a name="l191"></a> CSocketAddressIPV4 *source_ipv4;
<a name="l192"></a> CSocketAddressIPV6 *source_ipv6;
<a name="l193"></a> </span><span class=cF9>I64</span><span class=cF0> de_index;
<a name="l194"></a> CTCPAckQueue *send_buffer = </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l195"></a> CTCPAckQueue **send_buffer_ptr = </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l196"></a>
<a name="l197"></a> NetDebug(</span><span class=cF6>&quot;TCP SEND FLAGS: Attempting Send using param TCP socket&quot;</span><span class=cF0>);
<a name="l198"></a>
<a name="l199"></a> </span><span class=cF1>switch</span><span class=cF0> (dest-&gt;family)
<a name="l200"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l201"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l202"></a> dest_ipv4 = dest;
<a name="l203"></a>
<a name="l204"></a> </span><span class=cF1>switch</span><span class=cF0> (source-&gt;family)
<a name="l205"></a> {
<a name="l206"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l207"></a> source_ipv4 = source;
<a name="l208"></a>
<a name="l209"></a> NetDebug(</span><span class=cF6>&quot;TCP SEND FLAGS: Trying TCP Packet Allocate... port src/dest 0x%0X/0x%0X&quot;</span><span class=cF0>,
<a name="l210"></a> source_ipv4-&gt;port, dest_ipv4-&gt;port);
<a name="l211"></a>
<a name="l212"></a> de_index = TCPPacketAllocate(&amp;payload_frame,
<a name="l213"></a> source_ipv4-&gt;address.address,
<a name="l214"></a> </span><span class=cF5>EndianU16</span><span class=cF7>(</span><span class=cF0>source_ipv4-&gt;port</span><span class=cF7>)</span><span class=cF0>,
<a name="l215"></a> dest_ipv4-&gt;address.address,
<a name="l216"></a> </span><span class=cF5>EndianU16</span><span class=cF7>(</span><span class=cF0>dest_ipv4-&gt;port</span><span class=cF7>)</span><span class=cF0>,
<a name="l217"></a> tcp_socket-&gt;next_send_seq_num,
<a name="l218"></a> tcp_socket-&gt;next_recv_seq_num,
<a name="l219"></a> flags,
<a name="l220"></a> </span><span class=cFE>0</span><span class=cF0>);
<a name="l221"></a> </span><span class=cF1>if</span><span class=cF0> (de_index &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l222"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l223"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: TCP Packet Allocate failed.&quot;</span><span class=cF0>);
<a name="l224"></a> </span><span class=cF1>return</span><span class=cF0> de_index;
<a name="l225"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l226"></a>
<a name="l227"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l228"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l229"></a> source_ipv6 = source;
<a name="l230"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l231"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l232"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l233"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: Error, TCP Send from AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l234"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l235"></a> }
<a name="l236"></a>
<a name="l237"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l238"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l239"></a> dest_ipv6 = dest;
<a name="l240"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l241"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l242"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l243"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: Error, TCP Send to AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l244"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l245"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l246"></a>
<a name="l247"></a> </span><span class=cF2>// at this point, a TCP packet has been allocated.</span><span class=cF0>
<a name="l248"></a> </span><span class=cF2>// TODO: Is there a better way to manage links across different address types?</span><span class=cF0>
<a name="l249"></a>
<a name="l250"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>Bt</span><span class=cF7>(</span><span class=cF0>&amp;flags, TCPf_SYN</span><span class=cF7>)</span><span class=cF0>)
<a name="l251"></a> tcp_socket-&gt;next_send_seq_num++;
<a name="l252"></a>
<a name="l253"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>Bt</span><span class=cF7>(</span><span class=cF0>&amp;flags, TCPf_FIN</span><span class=cF7>)</span><span class=cF0>)
<a name="l254"></a> tcp_socket-&gt;next_send_seq_num++;
<a name="l255"></a>
<a name="l256"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>Bt</span><span class=cF7>(</span><span class=cF0>&amp;flags, TCPf_FIN</span><span class=cF7>)</span><span class=cF0> || </span><span class=cF5>Bt</span><span class=cF7>(</span><span class=cF0>&amp;flags, TCPf_SYN</span><span class=cF7>)</span><span class=cF0>)
<a name="l257"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l258"></a> send_buffer_ptr = &amp;send_buffer;
<a name="l259"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l260"></a>
<a name="l261"></a>
<a name="l262"></a> </span><span class=cF1>switch</span><span class=cF0> (dest-&gt;family)
<a name="l263"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l264"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l265"></a> dest_ipv4 = dest;
<a name="l266"></a>
<a name="l267"></a> </span><span class=cF1>switch</span><span class=cF0> (source-&gt;family)
<a name="l268"></a> {
<a name="l269"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l270"></a> source_ipv4 = source;
<a name="l271"></a>
<a name="l272"></a> TCPPacketFinish(de_index,
<a name="l273"></a> source_ipv4-&gt;address.address,
<a name="l274"></a> dest_ipv4-&gt;address.address,
<a name="l275"></a> payload_frame,
<a name="l276"></a> </span><span class=cFE>0</span><span class=cF0>,
<a name="l277"></a> send_buffer_ptr);
<a name="l278"></a>
<a name="l279"></a> </span><span class=cF1>if</span><span class=cF0> (send_buffer)
<a name="l280"></a> </span><span class=cF7>{</span><span class=cF0> </span><span class=cF2>// modifying ptr should affect our send_buffer variable</span><span class=cF0>
<a name="l281"></a> send_buffer-&gt;end_seq_num = tcp_socket-&gt;next_send_seq_num;
<a name="l282"></a>
<a name="l283"></a> </span><span class=cF2>// append it to the socket, ACK Queue needs to be ready (head)...</span><span class=cF0>
<a name="l284"></a> </span><span class=cF5>QueueInsertRev</span><span class=cF0>(send_buffer, tcp_socket-&gt;ack_queue);
<a name="l285"></a>
<a name="l286"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l287"></a>
<a name="l288"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l289"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l290"></a> source_ipv6 = source;
<a name="l291"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l292"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l293"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l294"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: Error, TCP Send from AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l295"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l296"></a> }
<a name="l297"></a>
<a name="l298"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l299"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l300"></a> dest_ipv6 = dest;
<a name="l301"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l302"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l303"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l304"></a> NetErr(</span><span class=cF6>&quot;TCP SEND FLAGS: Error, TCP Send to AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l305"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l306"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l307"></a>}
<a name="l308"></a>
<a name="l309"></a></span><span class=cF9>I64</span><span class=cF0> TCPSendData(CTCPSocket *tcp_socket, </span><span class=cF1>U8</span><span class=cF0> flags, </span><span class=cF1>U8</span><span class=cF0> *data, </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l310"></a>{ </span><span class=cF2>// send TCP packet, flags and data. Stores into ACK Queue (Send Buffer).</span><span class=cF0>
<a name="l311"></a>
<a name="l312"></a> </span><span class=cF1>U8</span><span class=cF0> *payload_frame;
<a name="l313"></a> CSocketAddressStorage *dest = &amp;tcp_socket-&gt;destination_address;
<a name="l314"></a> CSocketAddressStorage *source = &amp;tcp_socket-&gt;source_address;
<a name="l315"></a> CSocketAddressIPV4 *dest_ipv4;
<a name="l316"></a> CSocketAddressIPV6 *dest_ipv6;
<a name="l317"></a> CSocketAddressIPV4 *source_ipv4;
<a name="l318"></a> CSocketAddressIPV6 *source_ipv6;
<a name="l319"></a> </span><span class=cF9>I64</span><span class=cF0> de_index;
<a name="l320"></a> CTCPAckQueue *send_buffer;
<a name="l321"></a>
<a name="l322"></a> NetDebug(</span><span class=cF6>&quot;TCP SEND DATA: Attempting Send using param TCP socket&quot;</span><span class=cF0>);
<a name="l323"></a>
<a name="l324"></a> </span><span class=cF1>switch</span><span class=cF0> (dest-&gt;family)
<a name="l325"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l326"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l327"></a> dest_ipv4 = dest;
<a name="l328"></a>
<a name="l329"></a> </span><span class=cF1>switch</span><span class=cF0> (source-&gt;family)
<a name="l330"></a> {
<a name="l331"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l332"></a> source_ipv4 = source;
<a name="l333"></a>
<a name="l334"></a> NetDebug(</span><span class=cF6>&quot;TCP SEND DATA: Trying TCP Packet Allocate... port src/dest 0x%0X/0x%0X&quot;</span><span class=cF0>,
<a name="l335"></a> source_ipv4-&gt;port, dest_ipv4-&gt;port);
<a name="l336"></a>
<a name="l337"></a> de_index = TCPPacketAllocate(&amp;payload_frame,
<a name="l338"></a> source_ipv4-&gt;address.address,
<a name="l339"></a> </span><span class=cF5>EndianU16</span><span class=cF7>(</span><span class=cF0>source_ipv4-&gt;port</span><span class=cF7>)</span><span class=cF0>,
<a name="l340"></a> dest_ipv4-&gt;address.address,
<a name="l341"></a> </span><span class=cF5>EndianU16</span><span class=cF7>(</span><span class=cF0>dest_ipv4-&gt;port</span><span class=cF7>)</span><span class=cF0>,
<a name="l342"></a> tcp_socket-&gt;next_send_seq_num,
<a name="l343"></a> tcp_socket-&gt;next_recv_seq_num,
<a name="l344"></a> flags,
<a name="l345"></a> length);
<a name="l346"></a> </span><span class=cF1>if</span><span class=cF0> (de_index &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l347"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l348"></a> NetLog(</span><span class=cF6>&quot;TCP SEND DATA: TCP Packet Allocate failed.&quot;</span><span class=cF0>);
<a name="l349"></a> </span><span class=cF1>return</span><span class=cF0> de_index;
<a name="l350"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l351"></a>
<a name="l352"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l353"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l354"></a> source_ipv6 = source;
<a name="l355"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l356"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l357"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l358"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: Error, TCP Send from AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l359"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l360"></a> }
<a name="l361"></a>
<a name="l362"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l363"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l364"></a> dest_ipv6 = dest;
<a name="l365"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l366"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l367"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l368"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: Error, TCP Send to AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l369"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l370"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l371"></a>
<a name="l372"></a> </span><span class=cF2>// at this point, a TCP packet has been allocated.</span><span class=cF0>
<a name="l373"></a> </span><span class=cF2>// TODO: Is there a better way to manage links across different address types?</span><span class=cF0>
<a name="l374"></a>
<a name="l375"></a> </span><span class=cF1>if</span><span class=cF0> (length)
<a name="l376"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(payload_frame, data, length);
<a name="l377"></a>
<a name="l378"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>Bt</span><span class=cF7>(</span><span class=cF0>&amp;flags, TCPf_SYN</span><span class=cF7>)</span><span class=cF0>)
<a name="l379"></a> tcp_socket-&gt;next_send_seq_num++;
<a name="l380"></a>
<a name="l381"></a> tcp_socket-&gt;next_send_seq_num += length;
<a name="l382"></a>
<a name="l383"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF5>Bt</span><span class=cF7>(</span><span class=cF0>&amp;flags, TCPf_FIN</span><span class=cF7>)</span><span class=cF0>)
<a name="l384"></a> tcp_socket-&gt;next_send_seq_num++;
<a name="l385"></a>
<a name="l386"></a> </span><span class=cF1>switch</span><span class=cF0> (dest-&gt;family)
<a name="l387"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l388"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l389"></a> dest_ipv4 = dest;
<a name="l390"></a>
<a name="l391"></a> </span><span class=cF1>switch</span><span class=cF0> (source-&gt;family)
<a name="l392"></a> {
<a name="l393"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l394"></a> source_ipv4 = source;
<a name="l395"></a>
<a name="l396"></a> TCPPacketFinish(de_index,
<a name="l397"></a> source_ipv4-&gt;address.address,
<a name="l398"></a> dest_ipv4-&gt;address.address,
<a name="l399"></a> payload_frame,
<a name="l400"></a> length,
<a name="l401"></a> &amp;send_buffer);
<a name="l402"></a>
<a name="l403"></a> send_buffer-&gt;end_seq_num = tcp_socket-&gt;next_send_seq_num;
<a name="l404"></a>
<a name="l405"></a> </span><span class=cF2>// append it to the socket, ACK Queue needs to be ready (head)...</span><span class=cF0>
<a name="l406"></a> </span><span class=cF5>QueueInsertRev</span><span class=cF0>(send_buffer, tcp_socket-&gt;ack_queue);
<a name="l407"></a>
<a name="l408"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l409"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l410"></a> source_ipv6 = source;
<a name="l411"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l412"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l413"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l414"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: Error, TCP Send from AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l415"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l416"></a> }
<a name="l417"></a>
<a name="l418"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l419"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l420"></a> dest_ipv6 = dest;
<a name="l421"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l422"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l423"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l424"></a> NetErr(</span><span class=cF6>&quot;TCP SEND DATA: Error, TCP Send to AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l425"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l426"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l427"></a>}
<a name="l428"></a>
<a name="l429"></a></span><span class=cF9>I64</span><span class=cF0> TCPPacketParse(CTCPHeader **header_out,
<a name="l430"></a> </span><span class=cF1>U8</span><span class=cF0> **data_out,
<a name="l431"></a> </span><span class=cF9>I64</span><span class=cF0> *length_out,
<a name="l432"></a> CIPV4Packet *packet)
<a name="l433"></a>{
<a name="l434"></a> CTCPHeader *header = packet-&gt;data;
<a name="l435"></a> </span><span class=cF9>I64</span><span class=cF0> header_length = (header-&gt;data_offset &gt;&gt; </span><span class=cFE>4</span><span class=cF0>) * </span><span class=cFE>4</span><span class=cF0>; </span><span class=cF2>// ?? why</span><span class=cF0>
<a name="l436"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>U32</span><span class=cF0> </span><span class=cF2> checksum, sum;</span><span class=cF0>
<a name="l437"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>CTCPPseudoHeader *pseudoheader</span><span class=cF0> </span><span class=cF2>= CAlloc(sizeof(CTCPPseudoHeader));</span><span class=cF0>
<a name="l438"></a>
<a name="l439"></a> </span><span class=cF2>// TODO: Validate packet-&gt;length !</span><span class=cF0>
<a name="l440"></a>
<a name="l441"></a> </span><span class=cF2>// Verify Checksum:</span><span class=cF0>
<a name="l442"></a></span><span class=cF2>/*</span><span class=cF0> </span><span class=cF2>NetWarn(&quot;DEBUG: TCPPACKETPARSE:</span><span class=cF0> </span><span class=cF2>0x%X = checksum from packet, verifying...&quot;, EndianU16(header-&gt;checksum));</span><span class=cF0>
<a name="l443"></a> </span><span class=cF2>pseudoheader-&gt;source_address</span><span class=cF0> </span><span class=cF2>= EndianU32(packet-&gt;source_ip_address);</span><span class=cF0>
<a name="l444"></a> </span><span class=cF2>pseudoheader-&gt;destination_address</span><span class=cF0> </span><span class=cF2>= EndianU32(packet-&gt;destination_ip_address);</span><span class=cF0>
<a name="l445"></a> </span><span class=cF2>pseudoheader-&gt;zeros</span><span class=cF0> </span><span class=cF2>= 0;</span><span class=cF0>
<a name="l446"></a> </span><span class=cF2>pseudoheader-&gt;protocol</span><span class=cF0> </span><span class=cF2>= IP_PROTOCOL_TCP;</span><span class=cF0>
<a name="l447"></a> </span><span class=cF2>pseudoheader-&gt;tcp_length</span><span class=cF0> </span><span class=cF2>= EndianU16(packet-&gt;length);</span><span class=cF0>
<a name="l448"></a>
<a name="l449"></a> </span><span class=cF2>checksum = TCPChecksumPartial(0, pseudoheader, sizeof(CTCPPseudoHeader));</span><span class=cF0>
<a name="l450"></a> </span><span class=cF2>NetWarn(&quot;DEBUG: TCPPACKETPARSE:</span><span class=cF0> </span><span class=cF2>0x%X = partial checksum&quot;, checksum);</span><span class=cF0>
<a name="l451"></a>
<a name="l452"></a> </span><span class=cF2>Free(pseudoheader); // No longer needed, discard</span><span class=cF0>
<a name="l453"></a>
<a name="l454"></a> </span><span class=cF2>sum = TCPChecksumFinal(checksum, header, packet-&gt;length);</span><span class=cF0>
<a name="l455"></a>
<a name="l456"></a> </span><span class=cF2>if (sum != EndianU16(header-&gt;checksum))</span><span class=cF0>
<a name="l457"></a> </span><span class=cF2>{</span><span class=cF0>
<a name="l458"></a> </span><span class=cF2>NetErr(&quot;DEBUG: TCPPACKETPARSE:</span><span class=cF0> </span><span class=cF2>0x%X = NOT MATCH&quot;, sum);</span><span class=cF0>
<a name="l459"></a> </span><span class=cF2>//return -1; // is checksum not being 0 in received header going to mess this up?..</span><span class=cF0>
<a name="l460"></a> </span><span class=cF2>}</span><span class=cF0>
<a name="l461"></a> </span><span class=cF2>// Checksum verified.</span><span class=cF0>
<a name="l462"></a></span><span class=cF2>*/</span><span class=cF0>
<a name="l463"></a>
<a name="l464"></a> *header_out = header;
<a name="l465"></a> *data_out = packet-&gt;data + header_length;
<a name="l466"></a> *length_out = packet-&gt;length - header_length;
<a name="l467"></a>
<a name="l468"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l469"></a>}
<a name="l470"></a>
<a name="l471"></a></span><span class=cF1>U0</span><span class=cF0> TCPAcknowledgePacket(CTCPSocket *tcp_socket, </span><span class=cF9>U32</span><span class=cF0> segment_ack)
<a name="l472"></a>{
<a name="l473"></a> </span><span class=cF1>F64</span><span class=cF0> time = </span><span class=cF5>tS</span><span class=cF0>;
<a name="l474"></a> </span><span class=cF1>F64</span><span class=cF0> rtt;
<a name="l475"></a> CTCPAckQueue *send_buffer = tcp_socket-&gt;ack_queue-&gt;next;
<a name="l476"></a> CTCPAckQueue *send_buffer_temp;
<a name="l477"></a> </span><span class=cF9>I64</span><span class=cF0> segment_ack_relative;
<a name="l478"></a> </span><span class=cF9>I64</span><span class=cF0> send_next_relative;
<a name="l479"></a>
<a name="l480"></a> NetDebug(</span><span class=cF6>&quot;TCP ACKNOWLEDGE PACKET: Looking to see if there are any send buffers&quot;</span><span class=cF0>);
<a name="l481"></a>
<a name="l482"></a> </span><span class=cF1>while</span><span class=cF0> (send_buffer != tcp_socket-&gt;ack_queue)
<a name="l483"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l484"></a> segment_ack_relative = (segment_ack - send_buffer-&gt;end_seq_num) &amp; </span><span class=cFE>0xFFFFFFFF</span><span class=cF0>;
<a name="l485"></a> send_next_relative = (tcp_socket-&gt;next_send_seq_num - send_buffer-&gt;end_seq_num) &amp; </span><span class=cFE>0xFFFFFFFF</span><span class=cF0>;
<a name="l486"></a> </span><span class=cF2>// ???</span><span class=cF0>
<a name="l487"></a>
<a name="l488"></a> </span><span class=cF1>if</span><span class=cF0> (segment_ack_relative &lt;= send_next_relative)
<a name="l489"></a> {
<a name="l490"></a> NetDebug(</span><span class=cF6>&quot;TCP ACKNOWLEDGE PACKET: Saw send buffer entry with ACK &lt;= next relative send ACK, removing.&quot;</span><span class=cF0>);
<a name="l491"></a> rtt = time - send_buffer-&gt;time_sent; </span><span class=cF2>// Round-Trip Time</span><span class=cF0>
<a name="l492"></a>
<a name="l493"></a> tcp_socket-&gt;srtt = (tcp_socket-&gt;srtt * TCP_SRTT_ALPHA) + (</span><span class=cF7>(</span><span class=cFE>1</span><span class=cF0>.</span><span class=cFE>0</span><span class=cF0> - TCP_SRTT_ALPHA</span><span class=cF7>)</span><span class=cF0> * rtt);
<a name="l494"></a> </span><span class=cF2>// Smoothed Round-Trip Time</span><span class=cF0>
<a name="l495"></a>
<a name="l496"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(send_buffer);
<a name="l497"></a> </span><span class=cF5>Free</span><span class=cF0>(send_buffer-&gt;tcp_packet);
<a name="l498"></a>
<a name="l499"></a> send_buffer_temp = send_buffer-&gt;next; </span><span class=cF2>// QueueRemove doesn't change removed queue's links</span><span class=cF0>
<a name="l500"></a> </span><span class=cF5>Free</span><span class=cF0>(send_buffer);
<a name="l501"></a>
<a name="l502"></a> send_buffer = send_buffer_temp;
<a name="l503"></a>
<a name="l504"></a> }
<a name="l505"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l506"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l507"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l508"></a>}
<a name="l509"></a>
<a name="l510"></a></span><span class=cF1>U0</span><span class=cF0> TCPCheckACKQueue(CTCPSocket *tcp_socket)
<a name="l511"></a>{
<a name="l512"></a> </span><span class=cF1>F64</span><span class=cF0> time = </span><span class=cF5>tS</span><span class=cF0>;
<a name="l513"></a> </span><span class=cF1>F64</span><span class=cF0> rto = TCP_RTO_BETA * tcp_socket-&gt;srtt; </span><span class=cF2>// Retransmission Timeout, Smoothed Round-Trip Time</span><span class=cF0>
<a name="l514"></a> CTCPAckQueue *send_buffer = tcp_socket-&gt;ack_queue-&gt;next;
<a name="l515"></a> CTCPAckQueue *first_buffer = send_buffer;
<a name="l516"></a> </span><span class=cF1>U8</span><span class=cF0> *tcp_frame;
<a name="l517"></a> </span><span class=cF9>I64</span><span class=cF0> de_index;
<a name="l518"></a> CSocketAddressStorage *dest = &amp;tcp_socket-&gt;destination_address;
<a name="l519"></a> CSocketAddressStorage *source = &amp;tcp_socket-&gt;source_address;
<a name="l520"></a> CSocketAddressIPV4 *dest_ipv4;
<a name="l521"></a> CSocketAddressIPV6 *dest_ipv6;
<a name="l522"></a> CSocketAddressIPV4 *source_ipv4;
<a name="l523"></a> CSocketAddressIPV6 *source_ipv6;
<a name="l524"></a>
<a name="l525"></a>
<a name="l526"></a> </span><span class=cF1>if</span><span class=cF0> (send_buffer == tcp_socket-&gt;ack_queue)
<a name="l527"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l528"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>NetWarn(&quot;TCP CHECK ACK QUEUE: ACK Queue empty, bailing early.&quot;);</span><span class=cF0>
<a name="l529"></a> </span><span class=cF1>return</span><span class=cF0>;
<a name="l530"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l531"></a>
<a name="l532"></a> </span><span class=cF1>if</span><span class=cF0> (rto &lt; TCP_RTO_MIN)
<a name="l533"></a> rto = TCP_RTO_MIN;
<a name="l534"></a> </span><span class=cF1>if</span><span class=cF0> (rto &lt; TCP_RTO_MAX)
<a name="l535"></a> rto = TCP_RTO_MAX;
<a name="l536"></a>
<a name="l537"></a> </span><span class=cF1>do</span><span class=cF0>
<a name="l538"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l539"></a> </span><span class=cF1>if</span><span class=cF0> (time &gt; send_buffer-&gt;time_sent + rto)
<a name="l540"></a> {
<a name="l541"></a> NetWarn(</span><span class=cF6>&quot;TCP CHECK ACK QUEUE: Retransmitting TCP packet in ACK Queue.&quot;</span><span class=cF0>);
<a name="l542"></a>
<a name="l543"></a> </span><span class=cF1>switch</span><span class=cF0> (dest-&gt;family)
<a name="l544"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l545"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l546"></a> dest_ipv4 = dest;
<a name="l547"></a>
<a name="l548"></a> </span><span class=cF1>switch</span><span class=cF0> (source-&gt;family)
<a name="l549"></a> {
<a name="l550"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l551"></a> source_ipv4 = source;
<a name="l552"></a>
<a name="l553"></a> de_index = IPV4PacketAllocate(&amp;tcp_frame,
<a name="l554"></a> IP_PROTOCOL_TCP,
<a name="l555"></a> source_ipv4-&gt;address.address,
<a name="l556"></a> dest_ipv4-&gt;address.address,
<a name="l557"></a> send_buffer-&gt;tcp_packet_size);
<a name="l558"></a>
<a name="l559"></a> </span><span class=cF1>if</span><span class=cF0> (de_index &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l560"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l561"></a> NetErr(</span><span class=cF6>&quot;TCP CHECK ACK QUEUE: IPV4 Packet Allocate failed.&quot;</span><span class=cF0>);
<a name="l562"></a> </span><span class=cF1>return</span><span class=cF0>;</span><span class=cF2>// de_index;</span><span class=cF0>
<a name="l563"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l564"></a>
<a name="l565"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(&amp;tcp_frame, send_buffer-&gt;tcp_packet, send_buffer-&gt;tcp_packet_size);
<a name="l566"></a>
<a name="l567"></a> IPV4PacketFinish(de_index);
<a name="l568"></a>
<a name="l569"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l570"></a>
<a name="l571"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l572"></a> source_ipv6 = source;
<a name="l573"></a> NetErr(</span><span class=cF6>&quot;TCP CHECK ACK QUEUE: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l574"></a> </span><span class=cF1>return</span><span class=cF0>;</span><span class=cF2>// -1;</span><span class=cF0>
<a name="l575"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l576"></a> NetErr(</span><span class=cF6>&quot;TCP CHECK ACK QUEUE: Error, TCP Send from AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l577"></a> </span><span class=cF1>return</span><span class=cF0>;</span><span class=cF2>// -1;</span><span class=cF0>
<a name="l578"></a> }
<a name="l579"></a>
<a name="l580"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l581"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l582"></a> dest_ipv6 = dest;
<a name="l583"></a> NetErr(</span><span class=cF6>&quot;TCP CHECK ACK QUEUE: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l584"></a> </span><span class=cF1>return</span><span class=cF0>;</span><span class=cF2>// -1;</span><span class=cF0>
<a name="l585"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l586"></a> NetErr(</span><span class=cF6>&quot;TCP CHECK ACK QUEUE: Error, TCP Send to AF_UNSPEC\n&quot;</span><span class=cF0>);
<a name="l587"></a> </span><span class=cF1>return</span><span class=cF0>;</span><span class=cF2>// -1;</span><span class=cF0>
<a name="l588"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l589"></a>
<a name="l590"></a> send_buffer-&gt;time_sent = </span><span class=cF5>tS</span><span class=cF0>;
<a name="l591"></a>
<a name="l592"></a> </span><span class=cF2>// If it gets here, retransmit was successful.</span><span class=cF0>
<a name="l593"></a>
<a name="l594"></a> </span><span class=cF2>// Move to the END OF THE CHAIN (BACK OF THE QUEUE. SO, REQUEUE.)</span><span class=cF0>
<a name="l595"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(send_buffer);
<a name="l596"></a> </span><span class=cF5>QueueInsertRev</span><span class=cF0>(send_buffer, tcp_socket-&gt;ack_queue);
<a name="l597"></a>
<a name="l598"></a> send_buffer = tcp_socket-&gt;ack_queue-&gt;next;
<a name="l599"></a>
<a name="l600"></a> }
<a name="l601"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l602"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l603"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l604"></a> </span><span class=cF1>while</span><span class=cF0> (send_buffer != first_buffer);
<a name="l605"></a>}
<a name="l606"></a>
<a name="l607"></a>CTCPSocket TCPSocket(</span><span class=cF9>U16</span><span class=cF0> domain=AF_UNSPEC)
<a name="l608"></a>{
<a name="l609"></a> </span><span class=cF9>U16</span><span class=cF0> type = SOCKET_STREAM;
<a name="l610"></a> CTCPSocket *tcp_socket = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPSocket</span><span class=cF7>)</span><span class=cF0>);
<a name="l611"></a> CTCPAckQueue *ack_queue = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPAckQueue</span><span class=cF7>)</span><span class=cF0>);
<a name="l612"></a> CTCPAcceptQueue *accept_queue = </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="l613"></a> CSocketAddressIPV4 *ipv4_address;
<a name="l614"></a> CSocketAddressIPV6 *ipv6_address;
<a name="l615"></a>
<a name="l616"></a> tcp_socket-&gt;socket = Socket(domain, type);
<a name="l617"></a> tcp_socket-&gt;state = TCP_STATE_CLOSED;
<a name="l618"></a>
<a name="l619"></a> tcp_socket-&gt;source_address.family = domain; </span><span class=cF2>// INET, INET6, or unspecified</span><span class=cF0>
<a name="l620"></a>
<a name="l621"></a> </span><span class=cF1>switch</span><span class=cF0> (domain)
<a name="l622"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l623"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l624"></a> ipv4_address = &amp;tcp_socket-&gt;source_address;
<a name="l625"></a>
<a name="l626"></a> ipv4_address-&gt;address.address = IPV4AddressGet;
<a name="l627"></a> </span><span class=cF2>// do we need to set local port? does that only make sense to do later?</span><span class=cF0>
<a name="l628"></a> </span><span class=cF2>// CAlloc will leave it at 0</span><span class=cF0>
<a name="l629"></a>
<a name="l630"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l631"></a>
<a name="l632"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l633"></a> ipv6_address = &amp;tcp_socket-&gt;source_address;
<a name="l634"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET: FIXME, IPV6 not implemented yet&quot;</span><span class=cF0>);
<a name="l635"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l636"></a>
<a name="l637"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l638"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET: Error TCP Socket to AF_UNSPEC&quot;</span><span class=cF0>);
<a name="l639"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l640"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l641"></a>
<a name="l642"></a> </span><span class=cF5>QueueInit</span><span class=cF0>(ack_queue); </span><span class=cF2>// init send buffer queue head</span><span class=cF0>
<a name="l643"></a> tcp_socket-&gt;ack_queue = ack_queue;
<a name="l644"></a>
<a name="l645"></a> </span><span class=cF5>QueueInit</span><span class=cF0>(accept_queue); </span><span class=cF2>// init pending connection queue</span><span class=cF0>
<a name="l646"></a> tcp_socket-&gt;accept_queue = accept_queue;
<a name="l647"></a>
<a name="l648"></a> tcp_socket-&gt;receive_buffer_size = TCP_WINDOW_SIZE;
<a name="l649"></a> tcp_socket-&gt;receive_buffer = </span><span class=cF5>CAlloc</span><span class=cF0>(TCP_WINDOW_SIZE);
<a name="l650"></a>
<a name="l651"></a> tcp_socket-&gt;max_segment_size = TCP_MSS;
<a name="l652"></a>
<a name="l653"></a> </span><span class=cF1>return</span><span class=cF0> tcp_socket;
<a name="l654"></a>}
<a name="l655"></a>
<a name="l656"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketBind(CTCPSocket *tcp_socket, CSocketAddressStorage *address)
<a name="l657"></a>{ </span><span class=cF2>// Binds a TCP socket to address, which contains the local port and remote address to use.</span><span class=cF0>
<a name="l658"></a> CTCPTreeNode *head = tcp_globals.bound_socket_tree;
<a name="l659"></a> CTCPTreeNode *temp_node;
<a name="l660"></a> CSocketAddressIPV4 *ipv4_address;
<a name="l661"></a> CSocketAddressIPV4 *ipv4_destination;
<a name="l662"></a> CSocketAddressIPV4 *ipv4_source;
<a name="l663"></a> CSocketAddressIPV6 *ipv6_address;
<a name="l664"></a> CSocketAddressIPV6 *ipv6_destination;
<a name="l665"></a> </span><span class=cF9>U16</span><span class=cF0> port;
<a name="l666"></a>
<a name="l667"></a> </span><span class=cF1>if</span><span class=cF0> (!SocketBind</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;socket</span><span class=cF7>)</span><span class=cF0>)
<a name="l668"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l669"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Failed, Socket state-machine must be in READY state.&quot;</span><span class=cF0>);
<a name="l670"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l671"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l672"></a>
<a name="l673"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;state != TCP_STATE_CLOSED)
<a name="l674"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l675"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Failed, TCP Socket must be in CLOSED state.&quot;</span><span class=cF0>);
<a name="l676"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l677"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l678"></a>
<a name="l679"></a> </span><span class=cF1>switch</span><span class=cF0> (address-&gt;family)
<a name="l680"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l681"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l682"></a>
<a name="l683"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;source_address.family == AF_INET6)
<a name="l684"></a> {
<a name="l685"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: FIXME, IPV6-&gt;IPV4 TCP BIND&quot;</span><span class=cF0>);
<a name="l686"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l687"></a> }
<a name="l688"></a>
<a name="l689"></a> ipv4_address = address;
<a name="l690"></a> ipv4_destination = &amp;tcp_socket-&gt;destination_address;
<a name="l691"></a>
<a name="l692"></a> ipv4_destination-&gt;family = AF_INET;
<a name="l693"></a> ipv4_destination-&gt;address.address = ipv4_address-&gt;address.address; </span><span class=cF2>// bind socket to address in parameter.</span><span class=cF0>
<a name="l694"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>ipv4_destination-&gt;port</span><span class=cF0> </span><span class=cF2>= ipv4_address-&gt;port; // ... consistency would say keep in Big Endian ...</span><span class=cF0>
<a name="l695"></a>
<a name="l696"></a> ipv4_source = &amp;tcp_socket-&gt;source_address;
<a name="l697"></a>
<a name="l698"></a> ipv4_source-&gt;port = ipv4_address-&gt;port;
<a name="l699"></a>
<a name="l700"></a> port = </span><span class=cF5>EndianU16</span><span class=cF0>(ipv4_address-&gt;port); </span><span class=cF2>// port member should be Big Endian, so now we're going L.E (?)</span><span class=cF0>
<a name="l701"></a>
<a name="l702"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l703"></a>
<a name="l704"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l705"></a>
<a name="l706"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;source_address.family == AF_INET)
<a name="l707"></a> {
<a name="l708"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Incompatible Address type.&quot;</span><span class=cF0>);
<a name="l709"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l710"></a> }
<a name="l711"></a>
<a name="l712"></a> ipv6_address = address;
<a name="l713"></a> ipv6_destination = &amp;tcp_socket-&gt;destination_address;
<a name="l714"></a> </span><span class=cF2>// ...</span><span class=cF0>
<a name="l715"></a> </span><span class=cF2>// ...</span><span class=cF0>
<a name="l716"></a>
<a name="l717"></a> port = </span><span class=cF5>EndianU16</span><span class=cF0>(ipv6_address-&gt;port); </span><span class=cF2>// port member should be Big Endian, so now we're going L.E (?)</span><span class=cF0>
<a name="l718"></a>
<a name="l719"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: FIXME, IPV6 TCP BIND&quot;</span><span class=cF0>);
<a name="l720"></a>
<a name="l721"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l722"></a>
<a name="l723"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l724"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Error, AF_UNSPEC TCP BIND -- param family&quot;</span><span class=cF0>);
<a name="l725"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l726"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l727"></a>
<a name="l728"></a> </span><span class=cF1>if</span><span class=cF0> (head)
<a name="l729"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l730"></a> </span><span class=cF2>// look for our port.</span><span class=cF0>
<a name="l731"></a> temp_node = TCPTreeNodeFind(port, head);
<a name="l732"></a>
<a name="l733"></a> </span><span class=cF1>if</span><span class=cF0> (temp_node)
<a name="l734"></a> { </span><span class=cF2>// if we find we have bound sockets at port, check address before adding to queue</span><span class=cF0>
<a name="l735"></a> </span><span class=cF1>switch</span><span class=cF0> (address-&gt;family)
<a name="l736"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l737"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l738"></a> </span><span class=cF1>if</span><span class=cF0> (TCPTreeNodeQueueIPV4Find</span><span class=cF7>(</span><span class=cF0>ipv4_destination-&gt;address.address, temp_node, </span><span class=cF3>TRUE</span><span class=cF7>)</span><span class=cF0>)
<a name="l739"></a> {
<a name="l740"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Address already in Bound Socket Tree !&quot;</span><span class=cF0>);
<a name="l741"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l742"></a> }
<a name="l743"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l744"></a> { </span><span class=cF2>// if no address match, free to add socket to the node queue</span><span class=cF0>
<a name="l745"></a> NetDebug(</span><span class=cF6>&quot;TCP SOCKET BIND: No address match, adding socket to node queue&quot;</span><span class=cF0>);
<a name="l746"></a> TCPTreeNodeQueueAdd(tcp_socket, temp_node);
<a name="l747"></a> }
<a name="l748"></a>
<a name="l749"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l750"></a>
<a name="l751"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l752"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: FIXME, IPV6 TCP BIND&quot;</span><span class=cF0>);
<a name="l753"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l754"></a>
<a name="l755"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l756"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Error, AF_UNSPEC TCP BIND -- found in bound tree&quot;</span><span class=cF0>);
<a name="l757"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l758"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l759"></a> }
<a name="l760"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l761"></a> { </span><span class=cF2>// if we get no node back from port search, we didn't find it and are free to add a new node.</span><span class=cF0>
<a name="l762"></a> temp_node = TCPTreeNodeParamAdd(port, head); </span><span class=cF2>// add new node with port, return its *.</span><span class=cF0>
<a name="l763"></a> TCPTreeNodeQueueAdd(tcp_socket, temp_node);
<a name="l764"></a> }
<a name="l765"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l766"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF2>// if no bound sockets, we init the tree as a new node</span><span class=cF0>
<a name="l767"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l768"></a> tcp_globals.bound_socket_tree = head = TCPTreeNodeParamInit(port); </span><span class=cF2>//... shouuuld be in L.E .. ?</span><span class=cF0>
<a name="l769"></a> TCPTreeNodeQueueAdd(tcp_socket, head); </span><span class=cF2>// add the tcp socket to the port queue</span><span class=cF0>
<a name="l770"></a> </span><span class=cF2>// maybe more checks to do before this, dunno rn.</span><span class=cF0>
<a name="l771"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l772"></a>
<a name="l773"></a>
<a name="l774"></a> </span><span class=cF2>// do we need to do anything else after bind add to tree? ...</span><span class=cF0>
<a name="l775"></a>
<a name="l776"></a>
<a name="l777"></a> </span><span class=cF1>switch</span><span class=cF0> (tcp_socket-&gt;socket-&gt;state)
<a name="l778"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l779"></a> </span><span class=cF1>case</span><span class=cF0> SOCKET_STATE_BIND_REQ: </span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>if BIND request success, set BOUND.</span><span class=cF0>
<a name="l780"></a> tcp_socket-&gt;socket-&gt;state = SOCKET_STATE_BOUND;
<a name="l781"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l782"></a>
<a name="l783"></a> </span><span class=cF1>default</span><span class=cF0>:
<a name="l784"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Failed, Misconfigured Socket state-machine.&quot;</span><span class=cF0>);
<a name="l785"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l786"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l787"></a>
<a name="l788"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l789"></a>}
<a name="l790"></a>
<a name="l791"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketClose(CTCPSocket *tcp_socket)
<a name="l792"></a>{
<a name="l793"></a> CTCPTreeNode *head = tcp_globals.bound_socket_tree;
<a name="l794"></a> CTCPTreeNode *node;
<a name="l795"></a> CTCPTreeQueue *queue;
<a name="l796"></a> CTCPAckQueue *send_buffer;
<a name="l797"></a> CTCPAcceptQueue *pending;
<a name="l798"></a> CSocketAddressIPV4 *address = &amp;tcp_socket-&gt;source_address;
<a name="l799"></a> </span><span class=cF9>I64</span><span class=cF0> timeout;
<a name="l800"></a>
<a name="l801"></a> SocketClose(tcp_socket-&gt;socket); </span><span class=cF2>// TODO: testing on closing a socket while another task is using it</span><span class=cF0>
<a name="l802"></a>
<a name="l803"></a> </span><span class=cF1>switch</span><span class=cF0> (tcp_socket-&gt;state)
<a name="l804"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l805"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_ESTABLISHED:
<a name="l806"></a> </span><span class=cF1>while</span><span class=cF0> (TCPSendFlags</span><span class=cF7>(</span><span class=cF0>tcp_socket, TCPF_FIN | TCPF_ACK</span><span class=cF7>)</span><span class=cF0> &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l807"></a> {
<a name="l808"></a> TCPCheckACKQueue(tcp_socket);
<a name="l809"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l810"></a> }
<a name="l811"></a>
<a name="l812"></a> tcp_socket-&gt;state = TCP_STATE_FIN_WAIT1;
<a name="l813"></a>
<a name="l814"></a> </span><span class=cF2>// Shrine has TODOs:</span><span class=cF0> </span><span class=cF2>- What states are allowed here?</span><span class=cF0>
<a name="l815"></a> </span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>- This can block forever if our recv buffer fills up</span><span class=cF0>
<a name="l816"></a> </span><span class=cF2>//</span><span class=cF0> </span><span class=cF2> </span><span class=cF0> </span><span class=cF2> but remote insists on sending more.</span><span class=cF0>
<a name="l817"></a> </span><span class=cF2>// Implementing timeout here to force close.</span><span class=cF0>
<a name="l818"></a> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + tcp_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l819"></a>
<a name="l820"></a> </span><span class=cF1>while</span><span class=cF0> (tcp_socket-&gt;state == TCP_STATE_FIN_WAIT1 &amp;&amp;
<a name="l821"></a> tcp_socket-&gt;first_unacked_seq != tcp_socket-&gt;next_send_seq_num &amp;&amp;
<a name="l822"></a> </span><span class=cFB>counts</span><span class=cF0>.jiffies &lt; timeout)
<a name="l823"></a> {
<a name="l824"></a> TCPCheckACKQueue(tcp_socket);
<a name="l825"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l826"></a> }
<a name="l827"></a>
<a name="l828"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;state == TCP_STATE_FIN_WAIT1)
<a name="l829"></a> tcp_socket-&gt;state = TCP_STATE_FIN_WAIT2;
<a name="l830"></a>
<a name="l831"></a> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + tcp_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l832"></a> </span><span class=cF1>while</span><span class=cF0> (tcp_socket-&gt;state == TCP_STATE_FIN_WAIT2 &amp;&amp; </span><span class=cFB>counts</span><span class=cF0>.jiffies &lt; timeout)
<a name="l833"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l834"></a>
<a name="l835"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l836"></a>
<a name="l837"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_CLOSE_WAIT:
<a name="l838"></a> </span><span class=cF1>while</span><span class=cF0> (TCPSendFlags</span><span class=cF7>(</span><span class=cF0>tcp_socket, TCPF_FIN | TCPF_ACK</span><span class=cF7>)</span><span class=cF0> &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l839"></a> {
<a name="l840"></a> TCPCheckACKQueue(tcp_socket);
<a name="l841"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l842"></a> }
<a name="l843"></a>
<a name="l844"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;state == TCP_STATE_CLOSE_WAIT)
<a name="l845"></a> tcp_socket-&gt;state = TCP_STATE_LAST_ACK;
<a name="l846"></a>
<a name="l847"></a> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + tcp_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l848"></a> </span><span class=cF1>while</span><span class=cF0> (tcp_socket-&gt;state == TCP_STATE_LAST_ACK &amp;&amp;
<a name="l849"></a> tcp_socket-&gt;first_unacked_seq != tcp_socket-&gt;next_send_seq_num &amp;&amp;
<a name="l850"></a> </span><span class=cFB>counts</span><span class=cF0>.jiffies &lt; timeout)
<a name="l851"></a> {
<a name="l852"></a> TCPCheckACKQueue(tcp_socket);
<a name="l853"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l854"></a> }
<a name="l855"></a>
<a name="l856"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l857"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l858"></a>
<a name="l859"></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="l860"></a> TCPSendFlags(tcp_socket, TCPF_RST);
<a name="l861"></a>
<a name="l862"></a> </span><span class=cF2>// remove from bound list, free associated allocs</span><span class=cF0>
<a name="l863"></a>
<a name="l864"></a> node = TCPTreeNodeFind(</span><span class=cF5>EndianU16</span><span class=cF7>(</span><span class=cF0>address-&gt;port</span><span class=cF7>)</span><span class=cF0>, head);
<a name="l865"></a>
<a name="l866"></a> </span><span class=cF1>if</span><span class=cF0> (node)
<a name="l867"></a> queue = TCPTreeNodeQueueSocketFind(tcp_socket, node);
<a name="l868"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l869"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l870"></a> </span><span class=cF5>Debug</span><span class=cF0>(</span><span class=cF6>&quot;TODO: Didn't find node at socket during TCPSocketClose!\n&quot;</span><span class=cF0>);
<a name="l871"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l872"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l873"></a>
<a name="l874"></a> </span><span class=cF1>if</span><span class=cF0> (queue)
<a name="l875"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l876"></a> TCPTreeNodeQueueSocketSinglePop(tcp_socket, node);
<a name="l877"></a>
<a name="l878"></a> </span><span class=cF1>if</span><span class=cF0> (node-&gt;queue == node-&gt;queue-&gt;next)
<a name="l879"></a> { </span><span class=cF2>// if we popped the only queue on the node, remove the node.</span><span class=cF0>
<a name="l880"></a> </span><span class=cF1>if</span><span class=cF0> (node == head)
<a name="l881"></a> </span><span class=cF7>{</span><span class=cF0> </span><span class=cF2>// head is the global. if node is the global, change it and add branches.</span><span class=cF0>
<a name="l882"></a> </span><span class=cF1>if</span><span class=cF0> (node-&gt;left)
<a name="l883"></a> {
<a name="l884"></a> tcp_globals.bound_socket_tree = head = node-&gt;left;
<a name="l885"></a> </span><span class=cF1>if</span><span class=cF0> (node-&gt;right)
<a name="l886"></a> TCPTreeNodeAdd(node-&gt;right, head);
<a name="l887"></a> }
<a name="l888"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (node-&gt;right)
<a name="l889"></a> tcp_globals.bound_socket_tree = node-&gt;right;
<a name="l890"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l891"></a> tcp_globals.bound_socket_tree = </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l892"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l893"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF2>// if node is not the global, just pop it from the tree</span><span class=cF0>
<a name="l894"></a> TCPTreeNodeSinglePop(node-&gt;value, head);
<a name="l895"></a>
<a name="l896"></a> </span><span class=cF5>Free</span><span class=cF0>(node);
<a name="l897"></a> }
<a name="l898"></a>
<a name="l899"></a> </span><span class=cF5>Free</span><span class=cF0>(tcp_socket-&gt;socket);
<a name="l900"></a>
<a name="l901"></a> NetWarn(</span><span class=cF6>&quot;TCP SOCKET CLOSE: Freeing socket, ACK queue, accept() queue, &amp; receive buffer.&quot;</span><span class=cF0>);
<a name="l902"></a> </span><span class=cF5>Free</span><span class=cF0>(tcp_socket-&gt;receive_buffer);
<a name="l903"></a>
<a name="l904"></a> send_buffer = tcp_socket-&gt;ack_queue-&gt;next;
<a name="l905"></a> </span><span class=cF1>while</span><span class=cF0> (send_buffer != tcp_socket-&gt;ack_queue)
<a name="l906"></a> {
<a name="l907"></a> NetWarn(</span><span class=cF6>&quot;TCP SOCKET CLOSE: Freeing send buffer @ 0x%0X&quot;</span><span class=cF0>, send_buffer);
<a name="l908"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(send_buffer);
<a name="l909"></a> </span><span class=cF5>Free</span><span class=cF0>(send_buffer-&gt;tcp_packet);
<a name="l910"></a> </span><span class=cF5>Free</span><span class=cF0>(send_buffer);
<a name="l911"></a> send_buffer = tcp_socket-&gt;ack_queue-&gt;next;
<a name="l912"></a> }
<a name="l913"></a>
<a name="l914"></a> pending = tcp_socket-&gt;accept_queue-&gt;next;
<a name="l915"></a> </span><span class=cF1>while</span><span class=cF0> (pending != tcp_socket-&gt;accept_queue)
<a name="l916"></a> {
<a name="l917"></a> NetWarn(</span><span class=cF6>&quot;TCP SOCKET CLOSE: Freeing pending connection @ 0x%0X&quot;</span><span class=cF0>, pending);
<a name="l918"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(pending);
<a name="l919"></a> </span><span class=cF5>Free</span><span class=cF0>(pending);
<a name="l920"></a> pending = tcp_socket-&gt;accept_queue-&gt;next;
<a name="l921"></a> }
<a name="l922"></a>
<a name="l923"></a>
<a name="l924"></a> </span><span class=cF5>Free</span><span class=cF0>(tcp_socket);
<a name="l925"></a> </span><span class=cF5>Free</span><span class=cF0>(queue);
<a name="l926"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l927"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l928"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l929"></a> </span><span class=cF5>Debug</span><span class=cF0>(</span><span class=cF6>&quot;TODO: Didn't find queue at socket during TCPSocketClose!\n&quot;</span><span class=cF0>);
<a name="l930"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l931"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l932"></a>
<a name="l933"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l934"></a>
<a name="l935"></a>}
<a name="l936"></a>
<a name="l937"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketConnect(CTCPSocket *tcp_socket, CSocketAddressStorage *address)
<a name="l938"></a>{ </span><span class=cF2>// Bind and connect a socket to the destination address and port in address param, local port automatic.</span><span class=cF0>
<a name="l939"></a> </span><span class=cF9>U16</span><span class=cF0> source_port = </span><span class=cF5>EndianU16</span><span class=cF0>(</span><span class=cFE>0x8000</span><span class=cF0> + tcp_globals.next_source_port++ &amp; </span><span class=cFE>0x7FFF</span><span class=cF0>);
<a name="l940"></a> CTCPTreeNode *head = tcp_globals.bound_socket_tree;
<a name="l941"></a> CTCPTreeNode *temp_node;
<a name="l942"></a> CSocketAddressIPV4 *ipv4_address;
<a name="l943"></a> CSocketAddressIPV4 *ipv4_destination;
<a name="l944"></a> CSocketAddressIPV4 *ipv4_source;
<a name="l945"></a> CSocketAddressIPV6 *ipv6_address;
<a name="l946"></a> CSocketAddressIPV6 *ipv6_destination;
<a name="l947"></a> </span><span class=cF9>I64</span><span class=cF0> timeout;
<a name="l948"></a> </span><span class=cF9>U16</span><span class=cF0> port;
<a name="l949"></a>
<a name="l950"></a>
<a name="l951"></a> </span><span class=cF1>if</span><span class=cF0> (!SocketConnect</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;socket</span><span class=cF7>)</span><span class=cF0>)
<a name="l952"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l953"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: Failed, Socket state-machine must be in READY state.&quot;</span><span class=cF0>);
<a name="l954"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l955"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l956"></a>
<a name="l957"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;state != TCP_STATE_CLOSED)
<a name="l958"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l959"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: TCP Socket must be in CLOSED state.&quot;</span><span class=cF0>);
<a name="l960"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l961"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l962"></a>
<a name="l963"></a> </span><span class=cF1>switch</span><span class=cF0> (address-&gt;family)
<a name="l964"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l965"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l966"></a>
<a name="l967"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;source_address.family == AF_INET6)
<a name="l968"></a> {
<a name="l969"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: FIXME, IPV6-&gt;IPV4 TCP CONNECT&quot;</span><span class=cF0>);
<a name="l970"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l971"></a> }
<a name="l972"></a>
<a name="l973"></a> ipv4_address = address;
<a name="l974"></a> ipv4_destination = &amp;tcp_socket-&gt;destination_address;
<a name="l975"></a>
<a name="l976"></a> ipv4_destination-&gt;family = AF_INET;
<a name="l977"></a> ipv4_destination-&gt;address.address = ipv4_address-&gt;address.address; </span><span class=cF2>// bind socket to address in parameter.</span><span class=cF0>
<a name="l978"></a> ipv4_destination-&gt;port = ipv4_address-&gt;port; </span><span class=cF2>// ... consistency would say keep in Big Endian ...</span><span class=cF0>
<a name="l979"></a>
<a name="l980"></a> ipv4_source = &amp;tcp_socket-&gt;source_address;
<a name="l981"></a>
<a name="l982"></a> ipv4_source-&gt;port = source_port;
<a name="l983"></a>
<a name="l984"></a> port = </span><span class=cF5>EndianU16</span><span class=cF0>(source_port); </span><span class=cF2>// port member should be Big Endian, so now we're going L.E (?)</span><span class=cF0>
<a name="l985"></a>
<a name="l986"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l987"></a>
<a name="l988"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l989"></a>
<a name="l990"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;source_address.family == AF_INET)
<a name="l991"></a> {
<a name="l992"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: Incompatible Address type.&quot;</span><span class=cF0>);
<a name="l993"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l994"></a> }
<a name="l995"></a>
<a name="l996"></a> ipv6_address = address;
<a name="l997"></a> ipv6_destination = &amp;tcp_socket-&gt;destination_address;
<a name="l998"></a> </span><span class=cF2>// ...</span><span class=cF0>
<a name="l999"></a> </span><span class=cF2>// ...</span><span class=cF0>
<a name="l1000"></a>
<a name="l1001"></a> port = </span><span class=cF5>EndianU16</span><span class=cF0>(source_port); </span><span class=cF2>// port member should be Big Endian, so now we're going L.E (?)</span><span class=cF0>
<a name="l1002"></a>
<a name="l1003"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: FIXME, IPV6 TCP CONNECT&quot;</span><span class=cF0>);
<a name="l1004"></a>
<a name="l1005"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1006"></a>
<a name="l1007"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l1008"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: Error, AF_UNSPEC TCP CONNECT -- param family&quot;</span><span class=cF0>);
<a name="l1009"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1010"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1011"></a>
<a name="l1012"></a> </span><span class=cF1>if</span><span class=cF0> (head)
<a name="l1013"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1014"></a> </span><span class=cF2>// look for our port.</span><span class=cF0>
<a name="l1015"></a> temp_node = TCPTreeNodeFind(port, head);
<a name="l1016"></a>
<a name="l1017"></a> </span><span class=cF1>if</span><span class=cF0> (temp_node)
<a name="l1018"></a> { </span><span class=cF2>// if we find we have bound sockets at port, check address before adding to queue</span><span class=cF0>
<a name="l1019"></a> </span><span class=cF1>switch</span><span class=cF0> (address-&gt;family)
<a name="l1020"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1021"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l1022"></a> </span><span class=cF1>if</span><span class=cF0> (TCPTreeNodeQueueIPV4Find</span><span class=cF7>(</span><span class=cF0>ipv4_destination-&gt;address.address, temp_node, </span><span class=cF3>TRUE</span><span class=cF7>)</span><span class=cF0>)
<a name="l1023"></a> {
<a name="l1024"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: Address already in Bound Socket Tree !&quot;</span><span class=cF0>);
<a name="l1025"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1026"></a> }
<a name="l1027"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1028"></a> { </span><span class=cF2>// if no address match, free to add socket to the node queue</span><span class=cF0>
<a name="l1029"></a> NetDebug(</span><span class=cF6>&quot;TCP SOCKET CONNECT: No address match, adding socket to node queue&quot;</span><span class=cF0>);
<a name="l1030"></a> TCPTreeNodeQueueAdd(tcp_socket, temp_node);
<a name="l1031"></a> }
<a name="l1032"></a>
<a name="l1033"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1034"></a>
<a name="l1035"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l1036"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: FIXME, IPV6 TCP CONNECT&quot;</span><span class=cF0>);
<a name="l1037"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1038"></a>
<a name="l1039"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l1040"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: Error, AF_UNSPEC TCP CONNECT -- found in bound tree&quot;</span><span class=cF0>);
<a name="l1041"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1042"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1043"></a> }
<a name="l1044"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1045"></a> { </span><span class=cF2>// if we get no node back from port search, we didn't find it and are free to add a new node.</span><span class=cF0>
<a name="l1046"></a> temp_node = TCPTreeNodeParamAdd(port, head); </span><span class=cF2>// add new node with port, return its *.</span><span class=cF0>
<a name="l1047"></a> TCPTreeNodeQueueAdd(tcp_socket, temp_node);
<a name="l1048"></a> }
<a name="l1049"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1050"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF2>// if no bound sockets, we init the tree as a new node</span><span class=cF0>
<a name="l1051"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1052"></a> tcp_globals.bound_socket_tree = head = TCPTreeNodeParamInit(port); </span><span class=cF2>//... shouuuld be in L.E .. ?</span><span class=cF0>
<a name="l1053"></a> TCPTreeNodeQueueAdd(tcp_socket, head); </span><span class=cF2>// add the tcp socket to the port queue</span><span class=cF0>
<a name="l1054"></a> </span><span class=cF2>// maybe more checks to do before this, dunno rn.</span><span class=cF0>
<a name="l1055"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1056"></a>
<a name="l1057"></a> tcp_socket-&gt;connection_time = </span><span class=cF5>tS</span><span class=cF0>;
<a name="l1058"></a> tcp_socket-&gt;receive_window = TCP_WINDOW_SIZE;
<a name="l1059"></a>
<a name="l1060"></a> tcp_socket-&gt;state = TCP_STATE_SYN_SENT;
<a name="l1061"></a> TCPSendFlags(tcp_socket, TCPF_SYN);
<a name="l1062"></a>
<a name="l1063"></a> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + tcp_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l1064"></a> </span><span class=cF1>while</span><span class=cF0> (</span><span class=cFB>counts</span><span class=cF0>.jiffies &lt; timeout)
<a name="l1065"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1066"></a> </span><span class=cF1>switch</span><span class=cF0> (tcp_socket-&gt;state)
<a name="l1067"></a> {
<a name="l1068"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_ESTABLISHED:
<a name="l1069"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_CLOSED:
<a name="l1070"></a> timeout = </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>// break out of while loop</span><span class=cF0>
<a name="l1071"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1072"></a>
<a name="l1073"></a> </span><span class=cF1>default</span><span class=cF0>:
<a name="l1074"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l1075"></a> }
<a name="l1076"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1077"></a>
<a name="l1078"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;state != TCP_STATE_ESTABLISHED)
<a name="l1079"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1080"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: Failed to establish TCP Socket connection.&quot;</span><span class=cF0>);
<a name="l1081"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1082"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1083"></a>
<a name="l1084"></a> </span><span class=cF1>switch</span><span class=cF0> (tcp_socket-&gt;socket-&gt;state)
<a name="l1085"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1086"></a> </span><span class=cF1>case</span><span class=cF0> SOCKET_STATE_CONNECT_REQ: </span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>if CONNECT request success, set OPEN.</span><span class=cF0>
<a name="l1087"></a> tcp_socket-&gt;socket-&gt;state = SOCKET_STATE_OPEN;
<a name="l1088"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1089"></a>
<a name="l1090"></a> </span><span class=cF1>default</span><span class=cF0>:
<a name="l1091"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET CONNECT: Failed, Misconfigured Socket state-machine.&quot;</span><span class=cF0>);
<a name="l1092"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1093"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1094"></a>
<a name="l1095"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l1096"></a>}
<a name="l1097"></a>
<a name="l1098"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketListen(CTCPSocket *tcp_socket, </span><span class=cF9>I64</span><span class=cF0> backlog_size)
<a name="l1099"></a>{ </span><span class=cF2>// Set a bound socket to Listen for incoming connections. Backlog size is max amount of waiting connections allowed</span><span class=cF0>
<a name="l1100"></a> </span><span class=cF1>if</span><span class=cF0> (!SocketListen</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;socket</span><span class=cF7>)</span><span class=cF0>)
<a name="l1101"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1102"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET LISTEN: Socket state-machine must be in BOUND state.&quot;</span><span class=cF0>);
<a name="l1103"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1104"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1105"></a>
<a name="l1106"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;state != TCP_STATE_CLOSED)
<a name="l1107"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1108"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET LISTEN: TCP Socket must be in CLOSED state.&quot;</span><span class=cF0>);
<a name="l1109"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1110"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1111"></a>
<a name="l1112"></a> tcp_socket-&gt;state = TCP_STATE_LISTEN;
<a name="l1113"></a> tcp_socket-&gt;accept_queue_limit = backlog_size;
<a name="l1114"></a>
<a name="l1115"></a> </span><span class=cF1>switch</span><span class=cF0> (tcp_socket-&gt;socket-&gt;state)
<a name="l1116"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1117"></a> </span><span class=cF1>case</span><span class=cF0> SOCKET_STATE_LISTEN_REQ: </span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>if LISTEN request success, set BOUND.</span><span class=cF0>
<a name="l1118"></a> tcp_socket-&gt;socket-&gt;state = SOCKET_STATE_LISTENING;
<a name="l1119"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1120"></a>
<a name="l1121"></a> </span><span class=cF1>default</span><span class=cF0>:
<a name="l1122"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET BIND: Failed, Misconfigured Socket state-machine.&quot;</span><span class=cF0>);
<a name="l1123"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1124"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1125"></a>
<a name="l1126"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l1127"></a>}
<a name="l1128"></a>
<a name="l1129"></a>CTCPSocket *TCPSocketAccept(CTCPSocket *tcp_socket)
<a name="l1130"></a>{ </span><span class=cF2>// Accepts &amp; creates a new socket, uses timeout inherited from Listening socket.</span><span class=cF0>
<a name="l1131"></a> CTCPAcceptQueue *pending;
<a name="l1132"></a> CTCPSocket *new_socket;
<a name="l1133"></a> CSocketAddressIPV4 *temp_addr;
<a name="l1134"></a> CSocketAddressIPV4 ipv4_address;
<a name="l1135"></a> </span><span class=cF9>I64</span><span class=cF0> timeout;
<a name="l1136"></a>
<a name="l1137"></a> </span><span class=cF1>if</span><span class=cF0> (!SocketAccept</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;socket</span><span class=cF7>)</span><span class=cF0>)
<a name="l1138"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1139"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET ACCEPT: Failed, Socket state-machine must be in LISTENING state.&quot;</span><span class=cF0>);
<a name="l1140"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1141"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1142"></a>
<a name="l1143"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;state != TCP_STATE_LISTEN)
<a name="l1144"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1145"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET LISTEN: TCP Socket must be in LISTEN state.&quot;</span><span class=cF0>);
<a name="l1146"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1147"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1148"></a>
<a name="l1149"></a> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + tcp_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l1150"></a> </span><span class=cF1>while</span><span class=cF0> (</span><span class=cF7>(</span><span class=cF0>pending = tcp_socket-&gt;accept_queue-&gt;next</span><span class=cF7>)</span><span class=cF0> == tcp_socket-&gt;accept_queue)
<a name="l1151"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1152"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cFB>counts</span><span class=cF0>.jiffies &gt; timeout)
<a name="l1153"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1154"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1155"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l1156"></a> </span><span class=cF2>// Yield;</span><span class=cF0>
<a name="l1157"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1158"></a>
<a name="l1159"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(pending); </span><span class=cF2>// whether successful accept() or not, remove pending connection.</span><span class=cF0>
<a name="l1160"></a>
<a name="l1161"></a></span><span class=cF2>// TODO: rework accept logic to handle IPV6 addresses</span><span class=cF0>
<a name="l1162"></a> new_socket = TCPSocket(AF_INET);
<a name="l1163"></a>
<a name="l1164"></a> new_socket-&gt;next_recv_seq_num = ++pending-&gt;segment_seq_num;
<a name="l1165"></a> new_socket-&gt;connection_time = </span><span class=cF5>tS</span><span class=cF0>;
<a name="l1166"></a> new_socket-&gt;receive_window = TCP_WINDOW_SIZE;
<a name="l1167"></a> new_socket-&gt;timeout = tcp_socket-&gt;timeout;
<a name="l1168"></a>
<a name="l1169"></a> temp_addr = &amp;tcp_socket-&gt;source_address;
<a name="l1170"></a>
<a name="l1171"></a> ipv4_address.family = AF_INET;
<a name="l1172"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>ipv4_address.port</span><span class=cF0> </span><span class=cF2>= pending-&gt;port;</span><span class=cF0>
<a name="l1173"></a> ipv4_address.port = temp_addr-&gt;port;
<a name="l1174"></a> ipv4_address.address.address = pending-&gt;ipv4_address;
<a name="l1175"></a>
<a name="l1176"></a> NetDebug(</span><span class=cF6>&quot;TCP SOCKET ACCEPT: Attempting to Bind to pending connection %0X @ src/dst ports %d,%d.&quot;</span><span class=cF0>,
<a name="l1177"></a> pending-&gt;ipv4_address, ipv4_address.port, pending-&gt;port);
<a name="l1178"></a>
<a name="l1179"></a> </span><span class=cF1>if</span><span class=cF0> (TCPSocketBind</span><span class=cF7>(</span><span class=cF0>new_socket, &amp;ipv4_address</span><span class=cF7>)</span><span class=cF0> == -</span><span class=cFE>1</span><span class=cF0>)
<a name="l1180"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1181"></a> </span><span class=cF5>Free</span><span class=cF0>(pending);
<a name="l1182"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1183"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1184"></a>
<a name="l1185"></a> temp_addr = &amp;new_socket-&gt;destination_address;
<a name="l1186"></a>
<a name="l1187"></a> temp_addr-&gt;port = pending-&gt;port;
<a name="l1188"></a>
<a name="l1189"></a> new_socket-&gt;state = TCP_STATE_SYN_RECEIVED;
<a name="l1190"></a>
<a name="l1191"></a> NetDebug(</span><span class=cF6>&quot;TCP SOCKET ACCEPT: Attempting Send Flags SYN ACK back to requester.&quot;</span><span class=cF0>);
<a name="l1192"></a> TCPSendFlags(new_socket, TCPF_SYN | TCPF_ACK);
<a name="l1193"></a>
<a name="l1194"></a> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + new_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l1195"></a> </span><span class=cF1>while</span><span class=cF0> (</span><span class=cFB>counts</span><span class=cF0>.jiffies &lt; timeout)
<a name="l1196"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1197"></a> </span><span class=cF1>switch</span><span class=cF0> (new_socket-&gt;state)
<a name="l1198"></a> {
<a name="l1199"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_ESTABLISHED:
<a name="l1200"></a> </span><span class=cF1>case</span><span class=cF0> TCP_STATE_CLOSED:
<a name="l1201"></a> timeout = </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>// break out of while loop</span><span class=cF0>
<a name="l1202"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1203"></a>
<a name="l1204"></a> </span><span class=cF1>default</span><span class=cF0>:
<a name="l1205"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l1206"></a> }
<a name="l1207"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1208"></a>
<a name="l1209"></a> </span><span class=cF1>if</span><span class=cF0> (new_socket-&gt;state != TCP_STATE_ESTABLISHED)
<a name="l1210"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1211"></a> TCPSocketClose(new_socket);
<a name="l1212"></a> </span><span class=cF5>Free</span><span class=cF0>(pending);
<a name="l1213"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1214"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1215"></a>
<a name="l1216"></a> </span><span class=cF5>Free</span><span class=cF0>(pending);
<a name="l1217"></a>
<a name="l1218"></a> new_socket-&gt;socket-&gt;state = SOCKET_STATE_OPEN;
<a name="l1219"></a>
<a name="l1220"></a> </span><span class=cF1>return</span><span class=cF0> new_socket;
<a name="l1221"></a>}
<a name="l1222"></a>
<a name="l1223"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketReceive(CTCPSocket *tcp_socket, </span><span class=cF1>U8</span><span class=cF0> *buffer, </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l1224"></a>{
<a name="l1225"></a> </span><span class=cF9>I64</span><span class=cF0> read_position;
<a name="l1226"></a> </span><span class=cF9>I64</span><span class=cF0> write_position;
<a name="l1227"></a> </span><span class=cF9>I64</span><span class=cF0> read_total = </span><span class=cFE>0</span><span class=cF0>;
<a name="l1228"></a> </span><span class=cF9>I64</span><span class=cF0> step;
<a name="l1229"></a> </span><span class=cF9>I64</span><span class=cF0> timeout;
<a name="l1230"></a>
<a name="l1231"></a> </span><span class=cF1>if</span><span class=cF0> (!SocketReceive</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;socket</span><span class=cF7>)</span><span class=cF0>)
<a name="l1232"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1233"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET RECEIVE: Failed, Socket state-machine must be in OPEN or BOUND state.&quot;</span><span class=cF0>);
<a name="l1234"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1235"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1236"></a>
<a name="l1237"></a> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + tcp_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l1238"></a>
<a name="l1239"></a> </span><span class=cF1>while</span><span class=cF0> (</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;state == TCP_STATE_ESTABLISHED ||
<a name="l1240"></a> tcp_socket-&gt;state == TCP_STATE_FIN_WAIT1 ||
<a name="l1241"></a> tcp_socket-&gt;state == TCP_STATE_CLOSE_WAIT</span><span class=cF7>)</span><span class=cF0> &amp;&amp; </span><span class=cF2>// allowing receive during closing state</span><span class=cF0>
<a name="l1242"></a> tcp_socket-&gt;read_position == tcp_socket-&gt;write_position)
<a name="l1243"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1244"></a> TCPCheckACKQueue(tcp_socket);
<a name="l1245"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l1246"></a>
<a name="l1247"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cFB>counts</span><span class=cF0>.jiffies &gt; timeout)
<a name="l1248"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1249"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1250"></a>
<a name="l1251"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;state != TCP_STATE_ESTABLISHED || tcp_socket-&gt;state == TCP_STATE_FIN_WAIT1</span><span class=cF7>)</span><span class=cF0> &amp;&amp;
<a name="l1252"></a> tcp_socket-&gt;read_position == tcp_socket-&gt;write_position || length == </span><span class=cFE>0</span><span class=cF0>)
<a name="l1253"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l1254"></a>
<a name="l1255"></a>
<a name="l1256"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cFB>counts</span><span class=cF0>.jiffies &gt; timeout)
<a name="l1257"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1258"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;timeout != </span><span class=cFE>0</span><span class=cF0>) </span><span class=cF2>// Don't flood NetLog on non-blocking receives.</span><span class=cF0>
<a name="l1259"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET RECEIVE: Timed out.&quot;</span><span class=cF0>);
<a name="l1260"></a>
<a name="l1261"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1262"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1263"></a>
<a name="l1264"></a>
<a name="l1265"></a> read_position = tcp_socket-&gt;read_position;
<a name="l1266"></a> write_position = tcp_socket-&gt;write_position;
<a name="l1267"></a>
<a name="l1268"></a> </span><span class=cF1>if</span><span class=cF0> (write_position &lt; read_position)
<a name="l1269"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1270"></a> step = tcp_socket-&gt;receive_buffer_size - read_position;
<a name="l1271"></a>
<a name="l1272"></a> </span><span class=cF1>if</span><span class=cF0> (step &gt; length)
<a name="l1273"></a> step = length;
<a name="l1274"></a>
<a name="l1275"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(buffer, tcp_socket-&gt;receive_buffer + read_position, step);
<a name="l1276"></a> buffer += step;
<a name="l1277"></a> length -= step;
<a name="l1278"></a></span><span class=cF2>//</span><span class=cF0> </span><span class=cF2>read_position = (read_position + step) &amp; (tcp_socket-&gt;receive_buffer_size - 1);</span><span class=cF0>
<a name="l1279"></a> read_position = (read_position + step) % tcp_socket-&gt;receive_buffer_size;
<a name="l1280"></a> read_total += step;
<a name="l1281"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1282"></a>
<a name="l1283"></a> </span><span class=cF1>if</span><span class=cF0> (length &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l1284"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1285"></a> step = write_position - read_position;
<a name="l1286"></a>
<a name="l1287"></a> </span><span class=cF1>if</span><span class=cF0> (step &gt; length)
<a name="l1288"></a> step = length;
<a name="l1289"></a>
<a name="l1290"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(buffer, tcp_socket-&gt;receive_buffer + read_position, step);
<a name="l1291"></a> buffer += step;
<a name="l1292"></a> length -= step;
<a name="l1293"></a> read_position += step;
<a name="l1294"></a> read_total += step;
<a name="l1295"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1296"></a>
<a name="l1297"></a> tcp_socket-&gt;read_position = read_position;
<a name="l1298"></a>
<a name="l1299"></a> </span><span class=cF1>return</span><span class=cF0> read_total;
<a name="l1300"></a>}
<a name="l1301"></a>
<a name="l1302"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketReceiveLine(CTCPSocket *tcp_socket, </span><span class=cF1>U8</span><span class=cF0> *buffer, </span><span class=cF9>I64</span><span class=cF0> size)
<a name="l1303"></a>{
<a name="l1304"></a> </span><span class=cF9>I64</span><span class=cF0> received = </span><span class=cFE>0</span><span class=cF0>;
<a name="l1305"></a>
<a name="l1306"></a> </span><span class=cF1>while</span><span class=cF0> (received + </span><span class=cFE>1</span><span class=cF0> &lt; size)
<a name="l1307"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1308"></a> </span><span class=cF1>if</span><span class=cF0> (TCPSocketReceive</span><span class=cF7>(</span><span class=cF0>tcp_socket, buffer + received, </span><span class=cFE>1</span><span class=cF7>)</span><span class=cF0> &lt;= </span><span class=cFE>0</span><span class=cF0>)
<a name="l1309"></a> {
<a name="l1310"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET RECEIVE LINE: Failed at TCPSocketReceive.&quot;</span><span class=cF0>);
<a name="l1311"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1312"></a> }
<a name="l1313"></a> </span><span class=cF1>if</span><span class=cF0> (buffer[received] == </span><span class=cF6>'\n'</span><span class=cF0>)
<a name="l1314"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1315"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (buffer[received] != </span><span class=cF6>'\r'</span><span class=cF0>)
<a name="l1316"></a> received++;
<a name="l1317"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1318"></a>
<a name="l1319"></a> </span><span class=cF2>// Shrine has 'FIXME: safe but incorrect behavior on overflow'</span><span class=cF0>
<a name="l1320"></a> buffer[received] = </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>// terminate string</span><span class=cF0>
<a name="l1321"></a> </span><span class=cF1>return</span><span class=cF0> received;
<a name="l1322"></a>}
<a name="l1323"></a>
<a name="l1324"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketSend(CTCPSocket *tcp_socket, </span><span class=cF1>U8</span><span class=cF0> *buffer, </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l1325"></a>{
<a name="l1326"></a> </span><span class=cF9>I64</span><span class=cF0> sent_total = </span><span class=cFE>0</span><span class=cF0>;
<a name="l1327"></a> </span><span class=cF9>I64</span><span class=cF0> timeout = </span><span class=cFB>counts</span><span class=cF0>.jiffies + tcp_socket-&gt;timeout * </span><span class=cF3>JIFFY_FREQ</span><span class=cF0> / </span><span class=cFE>1000</span><span class=cF0>;
<a name="l1328"></a> </span><span class=cF9>I64</span><span class=cF0> send_length;
<a name="l1329"></a>
<a name="l1330"></a> </span><span class=cF1>if</span><span class=cF0> (!SocketSend</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;socket</span><span class=cF7>)</span><span class=cF0>)
<a name="l1331"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1332"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET SEND: Failed, Socket state-machine must be in OPEN state.&quot;</span><span class=cF0>);
<a name="l1333"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l1334"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1335"></a>
<a name="l1336"></a> </span><span class=cF1>while</span><span class=cF0> (</span><span class=cF7>(</span><span class=cF0>tcp_socket-&gt;state == TCP_STATE_ESTABLISHED || tcp_socket-&gt;state == TCP_STATE_CLOSE_WAIT</span><span class=cF7>)</span><span class=cF0> &amp;&amp;
<a name="l1337"></a> length)
<a name="l1338"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1339"></a> send_length = (tcp_socket-&gt;first_unacked_seq + tcp_socket-&gt;send_window - tcp_socket-&gt;next_send_seq_num) &amp; </span><span class=cFE>0xFFFFFFFF</span><span class=cF0>;
<a name="l1340"></a>
<a name="l1341"></a> </span><span class=cF2>// Shrine has TODO: Keep trying, tie to timeout: RFC 793 &quot;Managing The Window&quot;</span><span class=cF0>
<a name="l1342"></a>
<a name="l1343"></a> </span><span class=cF1>if</span><span class=cF0> (send_length == </span><span class=cFE>0</span><span class=cF0>)
<a name="l1344"></a> {
<a name="l1345"></a> </span><span class=cF1>if</span><span class=cF0> (sent_total &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l1346"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1347"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1348"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1349"></a> TCPCheckACKQueue(tcp_socket);
<a name="l1350"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l1351"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1352"></a> }
<a name="l1353"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1354"></a> {
<a name="l1355"></a> </span><span class=cF1>if</span><span class=cF0> (send_length &gt; length)
<a name="l1356"></a> send_length = length;
<a name="l1357"></a>
<a name="l1358"></a> </span><span class=cF1>if</span><span class=cF0> (send_length &gt; tcp_socket-&gt;max_segment_size)
<a name="l1359"></a> send_length = tcp_socket-&gt;max_segment_size;
<a name="l1360"></a>
<a name="l1361"></a> NetDebug(</span><span class=cF6>&quot;TCP SOCKET SEND: Trying TCPSendData() of %d bytes.&quot;</span><span class=cF0>, send_length);
<a name="l1362"></a> </span><span class=cF1>if</span><span class=cF0> (TCPSendData</span><span class=cF7>(</span><span class=cF0>tcp_socket, TCPF_ACK, buffer, send_length</span><span class=cF7>)</span><span class=cF0> &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l1363"></a> </span><span class=cF7>{</span><span class=cF0> </span><span class=cF2>// Stall until outgoing data acknowledged.</span><span class=cF0>
<a name="l1364"></a> </span><span class=cF1>if</span><span class=cF0> (sent_total &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l1365"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1366"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1367"></a> {
<a name="l1368"></a> TCPCheckACKQueue(tcp_socket);
<a name="l1369"></a> </span><span class=cF5>Sleep</span><span class=cF0>(</span><span class=cFE>1</span><span class=cF0>);
<a name="l1370"></a> }
<a name="l1371"></a>
<a name="l1372"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1373"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1374"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1375"></a> buffer += send_length;
<a name="l1376"></a> length -= send_length;
<a name="l1377"></a> sent_total += send_length;
<a name="l1378"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1379"></a> }
<a name="l1380"></a>
<a name="l1381"></a> </span><span class=cF1>if</span><span class=cF0> (</span><span class=cFB>counts</span><span class=cF0>.jiffies &gt; timeout)
<a name="l1382"></a> {
<a name="l1383"></a> </span><span class=cF1>if</span><span class=cF0> (tcp_socket-&gt;timeout != </span><span class=cFE>0</span><span class=cF0>) </span><span class=cF2>// Don't flood NetLog on non-blocking sends.</span><span class=cF0>
<a name="l1384"></a> NetErr(</span><span class=cF6>&quot;TCP SOCKET SEND: Timed out.&quot;</span><span class=cF0>);
<a name="l1385"></a>
<a name="l1386"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1387"></a> }
<a name="l1388"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1389"></a>
<a name="l1390"></a> </span><span class=cF1>return</span><span class=cF0> sent_total;
<a name="l1391"></a>}
<a name="l1392"></a>
<a name="l1393"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketSendAll(CTCPSocket *tcp_socket, </span><span class=cF1>U8</span><span class=cF0> *buffer, </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l1394"></a>{
<a name="l1395"></a> </span><span class=cF9>I64</span><span class=cF0> total = </span><span class=cFE>0</span><span class=cF0>;
<a name="l1396"></a> </span><span class=cF9>I64</span><span class=cF0> sent = </span><span class=cFE>0</span><span class=cF0>;
<a name="l1397"></a>
<a name="l1398"></a> </span><span class=cF1>while</span><span class=cF0> (length)
<a name="l1399"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1400"></a> sent = TCPSocketSend(tcp_socket, buffer, length);
<a name="l1401"></a>
<a name="l1402"></a> </span><span class=cF1>if</span><span class=cF0> (sent &gt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l1403"></a> {
<a name="l1404"></a> buffer += sent;
<a name="l1405"></a> total += sent;
<a name="l1406"></a> length -= sent;
<a name="l1407"></a> }
<a name="l1408"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1409"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1410"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1411"></a>
<a name="l1412"></a> </span><span class=cF1>return</span><span class=cF0> total;
<a name="l1413"></a>}
<a name="l1414"></a>
<a name="l1415"></a></span><span class=cF9>I64</span><span class=cF0> TCPSocketSendString(CTCPSocket *tcp_socket, </span><span class=cF1>U8</span><span class=cF0> *string)
<a name="l1416"></a>{
<a name="l1417"></a> </span><span class=cF1>return</span><span class=cF0> TCPSocketSendAll(tcp_socket, string, </span><span class=cF5>StrLen</span><span class=cF7>(</span><span class=cF0>string</span><span class=cF7>)</span><span class=cF0>);
<a name="l1418"></a>}
<a name="l1419"></a>
<a name="l1420"></a>CTCPSocket *TCPConnectionCreate(</span><span class=cF1>U8</span><span class=cF0> *hostname, </span><span class=cF9>U16</span><span class=cF0> port)
<a name="l1421"></a>{
<a name="l1422"></a> CSocketAddressIPV4 socket_addr;
<a name="l1423"></a> CAddressInfo *current;
<a name="l1424"></a> CAddressInfo *info = </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1425"></a> </span><span class=cF9>I64</span><span class=cF0> error = DNSAddressInfoGet(hostname, </span><span class=cF3>NULL</span><span class=cF0>, &amp;info);
<a name="l1426"></a> CTCPSocket *result;
<a name="l1427"></a>
<a name="l1428"></a> </span><span class=cF1>if</span><span class=cF0> (error &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l1429"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1430"></a> NetErr(</span><span class=cF6>&quot;TCP CONNECTION CREATE: Failed at DNSAddressInfoGet.&quot;</span><span class=cF0>);
<a name="l1431"></a> AddressInfoFree(info);
<a name="l1432"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1433"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1434"></a>
<a name="l1435"></a> socket_addr.family = AF_INET;
<a name="l1436"></a> socket_addr.port = </span><span class=cF5>EndianU16</span><span class=cF0>(port);
<a name="l1437"></a> socket_addr.address.address = INADDR_ANY;
<a name="l1438"></a>
<a name="l1439"></a> current = info;
<a name="l1440"></a> </span><span class=cF1>while</span><span class=cF0> (current)
<a name="l1441"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1442"></a>
<a name="l1443"></a> </span><span class=cF1>if</span><span class=cF0> (current-&gt;family == AF_INET &amp;&amp; </span><span class=cF7>(</span><span class=cF0>current-&gt;socket_type == </span><span class=cFE>0</span><span class=cF0> || current-&gt;socket_type == SOCKET_STREAM</span><span class=cF7>)</span><span class=cF0>)
<a name="l1444"></a> { </span><span class=cF2>// TODO: IPV6 support !</span><span class=cF0>
<a name="l1445"></a> socket_addr.address.address = </span><span class=cF5>EndianU32</span><span class=cF0>(current-&gt;address</span><span class=cF7>(</span><span class=cF0>CSocketAddressIPV4 *</span><span class=cF7>)</span><span class=cF0>-&gt;address.address); </span><span class=cF2>// ?? why are bits flipped here</span><span class=cF0>
<a name="l1446"></a> AddressInfoFree(info);
<a name="l1447"></a>
<a name="l1448"></a> result = TCPSocket(AF_INET);
<a name="l1449"></a> </span><span class=cF1>if</span><span class=cF0> (!result)
<a name="l1450"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1451"></a> NetErr(</span><span class=cF6>&quot;TCP CONNECTION CREATE: Failed to create new TCP Socket.&quot;</span><span class=cF0>);
<a name="l1452"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1453"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1454"></a> result-&gt;timeout = TCP_TIMEOUT * </span><span class=cFE>3</span><span class=cF0>; </span><span class=cF2>// generous</span><span class=cF0>
<a name="l1455"></a> error = TCPSocketConnect(result, &amp;socket_addr);
<a name="l1456"></a> </span><span class=cF1>if</span><span class=cF0> (error &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l1457"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1458"></a> NetErr(</span><span class=cF6>&quot;TCP CONNECTION CREATE: Failed to connect TCP Socket to address.&quot;</span><span class=cF0>);
<a name="l1459"></a> TCPSocketClose(result);
<a name="l1460"></a> </span><span class=cF1>return</span><span class=cF0> error;
<a name="l1461"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1462"></a>
<a name="l1463"></a> </span><span class=cF1>return</span><span class=cF0> result;
<a name="l1464"></a> }
<a name="l1465"></a>
<a name="l1466"></a> current = current-&gt;next;
<a name="l1467"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1468"></a>
<a name="l1469"></a> NetErr(</span><span class=cF6>&quot;TCP CONNECTION CREATE: Failed to find a suitable address.&quot;</span><span class=cF0>);
<a name="l1470"></a>
<a name="l1471"></a> AddressInfoFree(info);
<a name="l1472"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cF3>NULL</span><span class=cF0>;
<a name="l1473"></a>
<a name="l1474"></a>}
<a name="l1475"></a>
<a name="l1476"></a></span><span class=cF1>U0</span><span class=cF0> TCPTreeNodeRep(CTCPTreeNode *node)
<a name="l1477"></a>{
<a name="l1478"></a> CTCPTreeQueue *queue = node-&gt;queue-&gt;next;
<a name="l1479"></a> CTCPSocket *socket;
<a name="l1480"></a> CSocketAddressIPV4 *ipv4_addr;
<a name="l1481"></a> CSocketAddressIPV6 *ipv6_addr;
<a name="l1482"></a> </span><span class=cF1>U8</span><span class=cF0> *string;
<a name="l1483"></a> CTCPAcceptQueue *pending;
<a name="l1484"></a>
<a name="l1485"></a>
<a name="l1486"></a> </span><span class=cF6>&quot;Local Port $YELLOW$%d$FG$ (TCP Node @ $CYAN$0x%X$FG$):\n&quot;</span><span class=cF0>, node-&gt;value, node;
<a name="l1487"></a>
<a name="l1488"></a> </span><span class=cF1>while</span><span class=cF0> (queue != node-&gt;queue)
<a name="l1489"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1490"></a>
<a name="l1491"></a> socket = queue-&gt;socket;
<a name="l1492"></a>
<a name="l1493"></a> </span><span class=cF1>switch</span><span class=cF0> (socket-&gt;destination_address.family)
<a name="l1494"></a> {
<a name="l1495"></a>
<a name="l1496"></a> </span><span class=cF1>case</span><span class=cF0> AF_UNSPEC:
<a name="l1497"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1498"></a>
<a name="l1499"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET:
<a name="l1500"></a> ipv4_addr = &amp;socket-&gt;destination_address;
<a name="l1501"></a> string = </span><span class=cF5>MStrPrint</span><span class=cF0>(</span><span class=cF6>&quot;%d.%d.%d.%d&quot;</span><span class=cF0>,
<a name="l1502"></a> ipv4_addr-&gt;address.address.u8[</span><span class=cFE>3</span><span class=cF0>],
<a name="l1503"></a> ipv4_addr-&gt;address.address.u8[</span><span class=cFE>2</span><span class=cF0>],
<a name="l1504"></a> ipv4_addr-&gt;address.address.u8[</span><span class=cFE>1</span><span class=cF0>],
<a name="l1505"></a> ipv4_addr-&gt;address.address.u8[</span><span class=cFE>0</span><span class=cF0>]); </span><span class=cF2>// todo: kludge, endianness...</span><span class=cF0>
<a name="l1506"></a>
<a name="l1507"></a> </span><span class=cF6>&quot;</span><span class=cF0> </span><span class=cF6>$BROWN$%s$FG$ Destination Port $YELLOW$%d$FG$ (TCP Tree Queue @ $CYAN$0x%X$FG$):\n&quot;</span><span class=cF0>,
<a name="l1508"></a> string, </span><span class=cF5>EndianU16</span><span class=cF0>(ipv4_addr-&gt;port), queue;
<a name="l1509"></a> </span><span class=cF5>Free</span><span class=cF0>(string);
<a name="l1510"></a>
<a name="l1511"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1512"></a>
<a name="l1513"></a> </span><span class=cF1>case</span><span class=cF0> AF_INET6:
<a name="l1514"></a> ipv6_addr = &amp;socket-&gt;destination_address;
<a name="l1515"></a>
<a name="l1516"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1517"></a>
<a name="l1518"></a> </span><span class=cF1>default</span><span class=cF0>:
<a name="l1519"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1520"></a>
<a name="l1521"></a> }
<a name="l1522"></a>
<a name="l1523"></a> </span><span class=cF6>&quot;</span><span class=cF0> </span><span class=cF6>Timeout: %dms\n&quot;</span><span class=cF0>, socket-&gt;timeout;
<a name="l1524"></a>
<a name="l1525"></a> pending = socket-&gt;accept_queue-&gt;next;
<a name="l1526"></a>
<a name="l1527"></a> </span><span class=cF1>while</span><span class=cF0> (pending != socket-&gt;accept_queue-&gt;next)
<a name="l1528"></a> {
<a name="l1529"></a> </span><span class=cF6>&quot;</span><span class=cF0> </span><span class=cF6>Pending connection from $BROWN$%d.%d.%d.%d$FG$:&quot;</span><span class=cF0>,
<a name="l1530"></a> pending-&gt;ipv4_address.u8[</span><span class=cFE>3</span><span class=cF0>],
<a name="l1531"></a> pending-&gt;ipv4_address.u8[</span><span class=cFE>2</span><span class=cF0>],
<a name="l1532"></a> pending-&gt;ipv4_address.u8[</span><span class=cFE>1</span><span class=cF0>],
<a name="l1533"></a> pending-&gt;ipv4_address.u8[</span><span class=cFE>0</span><span class=cF0>]; </span><span class=cF2>//todo: kludge, endianness?</span><span class=cF0>
<a name="l1534"></a>
<a name="l1535"></a> pending = pending-&gt;next;
<a name="l1536"></a> }
<a name="l1537"></a>
<a name="l1538"></a>
<a name="l1539"></a> queue = queue-&gt;next;
<a name="l1540"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1541"></a>
<a name="l1542"></a> </span><span class=cF6>&quot;\n&quot;</span><span class=cF0>;
<a name="l1543"></a>}
<a name="l1544"></a>
<a name="l1545"></a></span><span class=cF1>U0</span><span class=cF0> TCPRep()
<a name="l1546"></a>{
<a name="l1547"></a> CTCPTreeNode *node = tcp_globals.bound_socket_tree;
<a name="l1548"></a> CTCPRepEntry *head;
<a name="l1549"></a> CTCPRepEntry *entry;
<a name="l1550"></a> CTCPRepEntry *temp_entry;
<a name="l1551"></a>
<a name="l1552"></a> </span><span class=cF6>&quot;$LTBLUE$TCP Report:$FG$\n\n&quot;</span><span class=cF0>;
<a name="l1553"></a>
<a name="l1554"></a> </span><span class=cF1>if</span><span class=cF0> (node)
<a name="l1555"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1556"></a> head = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPRepEntry</span><span class=cF7>)</span><span class=cF0>);
<a name="l1557"></a> </span><span class=cF5>QueueInit</span><span class=cF0>(head); </span><span class=cF2>// no QueueRemove the head</span><span class=cF0>
<a name="l1558"></a>
<a name="l1559"></a> entry = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPRepEntry</span><span class=cF7>)</span><span class=cF0>);
<a name="l1560"></a> entry-&gt;node = node;
<a name="l1561"></a> </span><span class=cF5>QueueInsert</span><span class=cF0>(entry, head);
<a name="l1562"></a>
<a name="l1563"></a> </span><span class=cF2>// perform depth-first-search while Entry Queue has nodes not fully visited.</span><span class=cF0>
<a name="l1564"></a> </span><span class=cF1>while</span><span class=cF0> (entry != head)
<a name="l1565"></a> {
<a name="l1566"></a> </span><span class=cF1>if</span><span class=cF0> (entry-&gt;node-&gt;left)
<a name="l1567"></a> </span><span class=cF7>{</span><span class=cF0> </span><span class=cF2>// if node has one, add an Entry for the left branch, continue loop.</span><span class=cF0>
<a name="l1568"></a> temp_entry = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPRepEntry</span><span class=cF7>)</span><span class=cF0>);
<a name="l1569"></a> temp_entry-&gt;node = entry-&gt;node-&gt;left;
<a name="l1570"></a> </span><span class=cF5>QueueInsertRev</span><span class=cF0>(temp_entry, head);
<a name="l1571"></a>
<a name="l1572"></a> </span><span class=cF2>// if left branch, but no right: toss early, now fully traveled.</span><span class=cF0>
<a name="l1573"></a> </span><span class=cF1>if</span><span class=cF0> (!entry-&gt;node-&gt;right)
<a name="l1574"></a> {
<a name="l1575"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(entry);
<a name="l1576"></a> TCPTreeNodeRep(entry-&gt;node);
<a name="l1577"></a> </span><span class=cF5>Free</span><span class=cF0>(entry);
<a name="l1578"></a> }
<a name="l1579"></a>
<a name="l1580"></a> entry = temp_entry;
<a name="l1581"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1582"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF1>if</span><span class=cF0> (entry-&gt;node-&gt;right)
<a name="l1583"></a> </span><span class=cF7>{</span><span class=cF0> </span><span class=cF2>// if no left, but right: add right to queue, pop Entry, Rep, set entry to right.</span><span class=cF0>
<a name="l1584"></a> temp_entry = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPRepEntry</span><span class=cF7>)</span><span class=cF0>);
<a name="l1585"></a> temp_entry-&gt;node = entry-&gt;node-&gt;right;
<a name="l1586"></a> </span><span class=cF5>QueueInsertRev</span><span class=cF0>(temp_entry, head);
<a name="l1587"></a>
<a name="l1588"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(entry);
<a name="l1589"></a> TCPTreeNodeRep(entry-&gt;node);
<a name="l1590"></a> </span><span class=cF5>Free</span><span class=cF0>(entry);
<a name="l1591"></a>
<a name="l1592"></a> entry = temp_entry;
<a name="l1593"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1594"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1595"></a> </span><span class=cF7>{</span><span class=cF0> </span><span class=cF2>// pop Entry, Rep, if last Entry in Queue has right add it, pop &amp; Rep travelled Entry, entry = right.</span><span class=cF0>
<a name="l1596"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(entry);
<a name="l1597"></a> TCPTreeNodeRep(entry-&gt;node);
<a name="l1598"></a> </span><span class=cF5>Free</span><span class=cF0>(entry);
<a name="l1599"></a>
<a name="l1600"></a> </span><span class=cF1>if</span><span class=cF0> (head-&gt;last != head)
<a name="l1601"></a> {
<a name="l1602"></a> temp_entry = head-&gt;last;
<a name="l1603"></a>
<a name="l1604"></a> </span><span class=cF1>if</span><span class=cF0> (temp_entry-&gt;node-&gt;right)
<a name="l1605"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1606"></a> entry = temp_entry;
<a name="l1607"></a>
<a name="l1608"></a> temp_entry = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CTCPRepEntry</span><span class=cF7>)</span><span class=cF0>);
<a name="l1609"></a> temp_entry-&gt;node = entry-&gt;node-&gt;right;
<a name="l1610"></a> </span><span class=cF5>QueueInsertRev</span><span class=cF0>(temp_entry, head);
<a name="l1611"></a>
<a name="l1612"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(entry);
<a name="l1613"></a> TCPTreeNodeRep(entry-&gt;node);
<a name="l1614"></a> </span><span class=cF5>Free</span><span class=cF0>(entry);
<a name="l1615"></a>
<a name="l1616"></a> entry = temp_entry;
<a name="l1617"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1618"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1619"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l1620"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(temp_entry);
<a name="l1621"></a> TCPTreeNodeRep(temp_entry-&gt;node);
<a name="l1622"></a> </span><span class=cF5>Free</span><span class=cF0>(temp_entry);
<a name="l1623"></a>
<a name="l1624"></a> entry = head-&gt;last;
<a name="l1625"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1626"></a> }
<a name="l1627"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1628"></a> </span><span class=cF1>break</span><span class=cF0>;
<a name="l1629"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1630"></a> }
<a name="l1631"></a>
<a name="l1632"></a> </span><span class=cF5>Free</span><span class=cF0>(head);
<a name="l1633"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l1634"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l1635"></a> </span><span class=cF6>&quot;No TCP Sockets currently bound.\n\n&quot;</span><span class=cF0>;
<a name="l1636"></a>}
<a name="l1637"></a>
<a name="l1638"></a>
<a name="l1639"></a>TCPGlobalsInit;
</span></pre></body>
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