Andrew Boyson / net

A stack which works with or without an Mbed os library. Provides IPv4 or IPv6 with a full 1500 byte buffer.

Dependents:   oldheating gps motorhome heating

tcp/tcprecv.c@126:62edacc9f14d, 2019-02-25 (annotated)

Committer:
andrewboyson
Date:
Mon Feb 25 20:59:19 2019 +0000
Revision:
126:62edacc9f14d
Parent:
111:3600389d1add
Child:
131:774f7f367031
Added ability to post content plus content length and content start .

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 74:c3756bfa960e 1 #include <stdint.h>
andrewboyson 74:c3756bfa960e 2 #include <stdbool.h>
andrewboyson 75:603b10404183 3 #include <stdarg.h>
andrewboyson 74:c3756bfa960e 4
andrewboyson 74:c3756bfa960e 5 #include "log.h"
andrewboyson 74:c3756bfa960e 6 #include "net.h"
andrewboyson 74:c3756bfa960e 7 #include "action.h"
andrewboyson 74:c3756bfa960e 8 #include "tcp.h"
andrewboyson 74:c3756bfa960e 9 #include "tcphdr.h"
andrewboyson 74:c3756bfa960e 10 #include "tcpsend.h"
andrewboyson 74:c3756bfa960e 11 #include "tcb.h"
andrewboyson 74:c3756bfa960e 12 #include "ip4.h"
andrewboyson 74:c3756bfa960e 13 #include "dhcp.h"
andrewboyson 74:c3756bfa960e 14 #include "http.h"
andrewboyson 111:3600389d1add 15 #include "https.h"
andrewboyson 74:c3756bfa960e 16 #include "led.h"
andrewboyson 93:580fc113d9e9 17 #include "mstimer.h"
andrewboyson 97:d91f7db00235 18 #include "fault.h"
andrewboyson 89:9b765a67699b 19
andrewboyson 89:9b765a67699b 20 static void log(void (*traceback)(void), char* fmt, ...)
andrewboyson 74:c3756bfa960e 21 {
andrewboyson 78:9d8fc88df405 22 if (TcpTrace)
andrewboyson 78:9d8fc88df405 23 {
andrewboyson 78:9d8fc88df405 24 if (NetTraceNewLine) Log("\r\n");
andrewboyson 89:9b765a67699b 25 LogTimeF("TCP port %hu - ", TcpHdrSrcPort);
andrewboyson 75:603b10404183 26 va_list argptr;
andrewboyson 75:603b10404183 27 va_start(argptr, fmt);
andrewboyson 75:603b10404183 28 LogV(fmt, argptr);
andrewboyson 75:603b10404183 29 va_end(argptr);
andrewboyson 75:603b10404183 30 Log("\r\n");
andrewboyson 75:603b10404183 31 if (NetTraceStack) traceback();
andrewboyson 75:603b10404183 32 }
andrewboyson 75:603b10404183 33 }
andrewboyson 75:603b10404183 34
andrewboyson 88:1ba13e6062a3 35 static void handleSyn(void *pPacket, int ipType, int remArIndex, int locMss, struct tcb* pTcb)
andrewboyson 74:c3756bfa960e 36 {
andrewboyson 74:c3756bfa960e 37 //Get the MSS to use for sends - it is the lower of the MSS advertised by the remote host and our local MSS
andrewboyson 74:c3756bfa960e 38 int remMss = TcpHdrMssGet();
andrewboyson 74:c3756bfa960e 39 pTcb->remMss = remMss ? remMss : 536; //default MSS for IPv4 [576 - 20(TCP) - 20(IP)];
andrewboyson 74:c3756bfa960e 40 if (pTcb->remMss > locMss) pTcb->remMss = locMss;
andrewboyson 74:c3756bfa960e 41
andrewboyson 93:580fc113d9e9 42 pTcb->timeSendsBeingAcked = MsTimerCount;
andrewboyson 82:20781198d26d 43 pTcb->countSendsNotAcked = 0;
andrewboyson 79:f50e02fb5c94 44 pTcb->rcvdFin = false;
andrewboyson 79:f50e02fb5c94 45 pTcb->sentFin = false;
andrewboyson 79:f50e02fb5c94 46 pTcb->todo = 0;
andrewboyson 126:62edacc9f14d 47 pTcb->postComplete = false;
andrewboyson 79:f50e02fb5c94 48 pTcb->remIsn = TcpHdrSeqNum;
andrewboyson 79:f50e02fb5c94 49 pTcb->locIsn = TcbGetIsn();
andrewboyson 79:f50e02fb5c94 50 pTcb->bytesRcvdFromRem = 0;
andrewboyson 79:f50e02fb5c94 51 pTcb->bytesAckdByRem = 0;
andrewboyson 79:f50e02fb5c94 52 pTcb->bytesAckdToRem = 0;
andrewboyson 79:f50e02fb5c94 53 pTcb->bytesSentToRem = 0;
andrewboyson 74:c3756bfa960e 54 }
andrewboyson 88:1ba13e6062a3 55 static void handleReceivedData(void* pPacket, int dataLength, uint32_t position, struct tcb* pTcb)
andrewboyson 74:c3756bfa960e 56 {
andrewboyson 74:c3756bfa960e 57 pTcb->window = TcpHdrWindow;
andrewboyson 74:c3756bfa960e 58 char* pData = (char*)pPacket + TcpHdrSizeGet();
andrewboyson 74:c3756bfa960e 59 switch (pTcb->locPort)
andrewboyson 74:c3756bfa960e 60 {
andrewboyson 74:c3756bfa960e 61 case 80:
andrewboyson 126:62edacc9f14d 62 HttpHandleRequest(dataLength, pData, position, &pTcb->todo, &pTcb->postComplete);
andrewboyson 74:c3756bfa960e 63 break;
andrewboyson 111:3600389d1add 64 case 443:
andrewboyson 111:3600389d1add 65 HttpsHandleRequest(dataLength, pData, position, &pTcb->todo);
andrewboyson 111:3600389d1add 66 break;
andrewboyson 74:c3756bfa960e 67 default:
andrewboyson 74:c3756bfa960e 68 break;
andrewboyson 74:c3756bfa960e 69 }
andrewboyson 74:c3756bfa960e 70 }
andrewboyson 90:955f4c6e18a9 71 static int sendResetFromPacket(int* pSizeTx, void* pPacketTx, int ipType, int remArIndex, int locIpScope, int seqLengthRcvd)
andrewboyson 89:9b765a67699b 72 {
andrewboyson 90:955f4c6e18a9 73 /*RFC793 p36 If the connection does not exist (CLOSED) then a reset is sent
andrewboyson 90:955f4c6e18a9 74 in response to any incoming segment except another reset.
andrewboyson 90:955f4c6e18a9 75 If the incoming segment has an ACK field, the reset takes its sequence number from the ACK field of the segment,
andrewboyson 90:955f4c6e18a9 76 otherwise the reset has sequence number zero
andrewboyson 90:955f4c6e18a9 77 and
andrewboyson 90:955f4c6e18a9 78 the ACK field is set to the sum of the sequence number and segment length of the incoming segment.
andrewboyson 90:955f4c6e18a9 79 The connection remains in the CLOSED state.
andrewboyson 90:955f4c6e18a9 80 In TcpSendReset TcpHdrAckNum = pTcb->bytesAckdToRem + pTcb->remIsn; //Set up the acknowledgement field ready to send
andrewboyson 90:955f4c6e18a9 81 TcpHdrSeqNum = pTcb->bytesSentToRem + pTcb->locIsn; //Set up the start of the message before adding the bytes sent
andrewboyson 90:955f4c6e18a9 82 */
andrewboyson 90:955f4c6e18a9 83
andrewboyson 89:9b765a67699b 84 struct tcb tcb;
andrewboyson 89:9b765a67699b 85 struct tcb* pTcb = &tcb;
andrewboyson 93:580fc113d9e9 86 pTcb->timeLastRcvd = MsTimerCount;
andrewboyson 89:9b765a67699b 87 pTcb->remArIndex = remArIndex;
andrewboyson 89:9b765a67699b 88 pTcb->ipType = ipType;
andrewboyson 89:9b765a67699b 89 pTcb->locIpScope = locIpScope;
andrewboyson 89:9b765a67699b 90 pTcb->remPort = TcpHdrSrcPort;
andrewboyson 89:9b765a67699b 91 pTcb->locPort = TcpHdrDstPort;
andrewboyson 89:9b765a67699b 92 pTcb->window = TcpHdrWindow;
andrewboyson 89:9b765a67699b 93 pTcb->state = TCB_EMPTY;
andrewboyson 89:9b765a67699b 94
andrewboyson 93:580fc113d9e9 95 pTcb->timeSendsBeingAcked = MsTimerCount;
andrewboyson 90:955f4c6e18a9 96 pTcb->countSendsNotAcked = 0;
andrewboyson 90:955f4c6e18a9 97 pTcb->rcvdFin = false;
andrewboyson 90:955f4c6e18a9 98 pTcb->sentFin = false;
andrewboyson 90:955f4c6e18a9 99 pTcb->todo = 0;
andrewboyson 126:62edacc9f14d 100 pTcb->postComplete = false;
andrewboyson 90:955f4c6e18a9 101 pTcb->remIsn = TcpHdrSeqNum + seqLengthRcvd; //Ack number
andrewboyson 90:955f4c6e18a9 102 pTcb->locIsn = TcpHdrACK ? TcpHdrAckNum : 0; //Seq number
andrewboyson 90:955f4c6e18a9 103 pTcb->bytesRcvdFromRem = 0;
andrewboyson 90:955f4c6e18a9 104 pTcb->bytesAckdByRem = 0;
andrewboyson 90:955f4c6e18a9 105 pTcb->bytesAckdToRem = 0;
andrewboyson 90:955f4c6e18a9 106 pTcb->bytesSentToRem = 0;
andrewboyson 90:955f4c6e18a9 107
andrewboyson 89:9b765a67699b 108 return TcpSendReset(pSizeTx, pPacketTx, pTcb);
andrewboyson 89:9b765a67699b 109 }
andrewboyson 74:c3756bfa960e 110
andrewboyson 80:4ef1500fca1d 111 int TcpHandleReceivedPacket(void (*traceback)(void), int sizeRx, void* pPacketRx, int* pSizeTx, void* pPacketTx, int ipType, int remArIndex, int locIpScope)
andrewboyson 74:c3756bfa960e 112 {
andrewboyson 98:b977424ec7f7 113 int lastFaultPoint = FaultPoint;
andrewboyson 97:d91f7db00235 114 FaultPoint = FAULT_POINT_TcpHandleReceivedPacket;
andrewboyson 97:d91f7db00235 115
andrewboyson 90:955f4c6e18a9 116 int action = DO_NOTHING;
andrewboyson 89:9b765a67699b 117 bool traceRequested = false;
andrewboyson 86:55bc5ddac16c 118
andrewboyson 89:9b765a67699b 119 TcpHdrReadFromPacket(pPacketRx);
andrewboyson 89:9b765a67699b 120
andrewboyson 78:9d8fc88df405 121 if (remArIndex < 0)
andrewboyson 78:9d8fc88df405 122 {
andrewboyson 89:9b765a67699b 123 log(traceback, "invalid remote AR index %d -> ignored packet", remArIndex);
andrewboyson 98:b977424ec7f7 124 FaultPoint = lastFaultPoint;
andrewboyson 78:9d8fc88df405 125 return DO_NOTHING;
andrewboyson 78:9d8fc88df405 126 }
andrewboyson 98:b977424ec7f7 127 FaultPoint += 100;
andrewboyson 78:9d8fc88df405 128
andrewboyson 74:c3756bfa960e 129 int dataLength = sizeRx - TcpHdrSizeGet();
andrewboyson 74:c3756bfa960e 130 int locMss = *pSizeTx - TcpHdrSizeGet();
andrewboyson 74:c3756bfa960e 131
andrewboyson 90:955f4c6e18a9 132 //Calculate the sequence length of the received packet
andrewboyson 90:955f4c6e18a9 133 int seqLengthRcvd = 0;
andrewboyson 90:955f4c6e18a9 134 if (TcpHdrSYN) seqLengthRcvd += 1; //Add one to acknowledge the SYN
andrewboyson 90:955f4c6e18a9 135 seqLengthRcvd += dataLength; //Add the number of bytes received
andrewboyson 90:955f4c6e18a9 136 if (TcpHdrFIN) seqLengthRcvd += 1; //Add one to acknowledge the FIN
andrewboyson 90:955f4c6e18a9 137
andrewboyson 74:c3756bfa960e 138 //Filter out unwanted links
andrewboyson 98:b977424ec7f7 139 FaultPoint++;
andrewboyson 74:c3756bfa960e 140 switch (TcpHdrDstPort)
andrewboyson 74:c3756bfa960e 141 {
andrewboyson 74:c3756bfa960e 142 case 80:
andrewboyson 74:c3756bfa960e 143 if (HttpTrace)
andrewboyson 74:c3756bfa960e 144 {
andrewboyson 74:c3756bfa960e 145 if (NetTraceNewLine) Log("\r\n");
andrewboyson 74:c3756bfa960e 146 LogTime("HTTP server request\r\n");
andrewboyson 89:9b765a67699b 147 traceRequested = true;
andrewboyson 74:c3756bfa960e 148 }
andrewboyson 74:c3756bfa960e 149 break;
andrewboyson 74:c3756bfa960e 150
andrewboyson 111:3600389d1add 151 case 443:
andrewboyson 111:3600389d1add 152 if (HttpsTrace)
andrewboyson 111:3600389d1add 153 {
andrewboyson 111:3600389d1add 154 if (NetTraceNewLine) Log("\r\n");
andrewboyson 111:3600389d1add 155 LogTime("HTTPS server request\r\n");
andrewboyson 111:3600389d1add 156 traceRequested = true;
andrewboyson 111:3600389d1add 157 }
andrewboyson 111:3600389d1add 158 break;
andrewboyson 111:3600389d1add 159
andrewboyson 89:9b765a67699b 160 default: //Send reset if unknown port
andrewboyson 89:9b765a67699b 161 log(traceback, "unhandled local port %hu -> sent reset", TcpHdrDstPort);
andrewboyson 90:955f4c6e18a9 162 action = sendResetFromPacket(pSizeTx, pPacketTx, ipType, remArIndex, locIpScope, seqLengthRcvd);
andrewboyson 98:b977424ec7f7 163 FaultPoint = lastFaultPoint;
andrewboyson 90:955f4c6e18a9 164 return action;
andrewboyson 74:c3756bfa960e 165 }
andrewboyson 74:c3756bfa960e 166
andrewboyson 76:17534bde28d3 167 //Get the Transmission Control Block
andrewboyson 98:b977424ec7f7 168 FaultPoint++;
andrewboyson 88:1ba13e6062a3 169 struct tcb* pTcb = TcbGetExisting(ipType, remArIndex, locIpScope, TcpHdrSrcPort, TcpHdrDstPort);
andrewboyson 76:17534bde28d3 170 if (!pTcb) pTcb = TcbGetEmpty();
andrewboyson 89:9b765a67699b 171 if (!pTcb) //send reset if no more tcbs are available
andrewboyson 76:17534bde28d3 172 {
andrewboyson 89:9b765a67699b 173 log(traceback, "no more tcbs available -> sent reset");
andrewboyson 90:955f4c6e18a9 174 action = sendResetFromPacket(pSizeTx, pPacketTx, ipType, remArIndex, locIpScope, seqLengthRcvd);
andrewboyson 98:b977424ec7f7 175 FaultPoint = lastFaultPoint;
andrewboyson 90:955f4c6e18a9 176 return action;
andrewboyson 76:17534bde28d3 177 }
andrewboyson 93:580fc113d9e9 178 pTcb->timeLastRcvd = MsTimerCount;
andrewboyson 76:17534bde28d3 179 pTcb->remArIndex = remArIndex;
andrewboyson 76:17534bde28d3 180 pTcb->ipType = ipType;
andrewboyson 81:50bfdd512f23 181 pTcb->locIpScope = locIpScope;
andrewboyson 76:17534bde28d3 182 pTcb->remPort = TcpHdrSrcPort;
andrewboyson 76:17534bde28d3 183 pTcb->locPort = TcpHdrDstPort;
andrewboyson 76:17534bde28d3 184 pTcb->window = TcpHdrWindow;
andrewboyson 75:603b10404183 185
andrewboyson 74:c3756bfa960e 186 //Handle request to reset
andrewboyson 98:b977424ec7f7 187 FaultPoint++;
andrewboyson 74:c3756bfa960e 188 if (TcpHdrRST)
andrewboyson 74:c3756bfa960e 189 {
andrewboyson 76:17534bde28d3 190 if (pTcb->state)
andrewboyson 74:c3756bfa960e 191 {
andrewboyson 89:9b765a67699b 192 log(traceback, "received reset -> reaped TCB");
andrewboyson 75:603b10404183 193 pTcb->state = TCB_EMPTY;
andrewboyson 74:c3756bfa960e 194 }
andrewboyson 98:b977424ec7f7 195 FaultPoint = lastFaultPoint;
andrewboyson 74:c3756bfa960e 196 return DO_NOTHING; //Don't reply
andrewboyson 74:c3756bfa960e 197 }
andrewboyson 74:c3756bfa960e 198
andrewboyson 74:c3756bfa960e 199 //Handle request to synchronise
andrewboyson 98:b977424ec7f7 200 FaultPoint++;
andrewboyson 74:c3756bfa960e 201 if (TcpHdrSYN)
andrewboyson 74:c3756bfa960e 202 {
andrewboyson 76:17534bde28d3 203 if (pTcb->state)
andrewboyson 75:603b10404183 204 {
andrewboyson 89:9b765a67699b 205 log(traceback, "received a SYN on an open connection -> sent reset");
andrewboyson 75:603b10404183 206 pTcb->state = TCB_EMPTY;
andrewboyson 90:955f4c6e18a9 207 action = TcpSendReset(pSizeTx, pPacketTx, pTcb);
andrewboyson 98:b977424ec7f7 208 FaultPoint = lastFaultPoint;
andrewboyson 90:955f4c6e18a9 209 return action;
andrewboyson 75:603b10404183 210 }
andrewboyson 76:17534bde28d3 211 else
andrewboyson 75:603b10404183 212 {
andrewboyson 88:1ba13e6062a3 213 handleSyn(pPacketRx, ipType, remArIndex, locMss, pTcb);
andrewboyson 75:603b10404183 214 }
andrewboyson 74:c3756bfa960e 215 }
andrewboyson 74:c3756bfa960e 216
andrewboyson 90:955f4c6e18a9 217 //Handle non SYN packet on an empty connection
andrewboyson 98:b977424ec7f7 218 FaultPoint++;
andrewboyson 76:17534bde28d3 219 if (!TcpHdrSYN && !pTcb->state)
andrewboyson 76:17534bde28d3 220 {
andrewboyson 90:955f4c6e18a9 221
andrewboyson 89:9b765a67699b 222 log(traceback, "non SYN packet received on a closed connection -> sent reset");
andrewboyson 78:9d8fc88df405 223 pTcb->state = TCB_EMPTY;
andrewboyson 90:955f4c6e18a9 224 action = sendResetFromPacket(pSizeTx, pPacketTx, ipType, remArIndex, locIpScope, seqLengthRcvd);
andrewboyson 98:b977424ec7f7 225 FaultPoint = lastFaultPoint;
andrewboyson 90:955f4c6e18a9 226 return action;
andrewboyson 76:17534bde28d3 227 }
andrewboyson 76:17534bde28d3 228
andrewboyson 79:f50e02fb5c94 229 //Check if the acks of bytes sent has progressed and reset the timer
andrewboyson 98:b977424ec7f7 230 FaultPoint++;
andrewboyson 91:879545b19260 231 uint32_t ackRcvdFromRem = TcpHdrACK ? TcpHdrAckNum - pTcb->locIsn : 0;
andrewboyson 82:20781198d26d 232 if (ackRcvdFromRem > pTcb->bytesAckdByRem)
andrewboyson 82:20781198d26d 233 {
andrewboyson 93:580fc113d9e9 234 pTcb->timeSendsBeingAcked = MsTimerCount;
andrewboyson 82:20781198d26d 235 pTcb->countSendsNotAcked = 0;
andrewboyson 82:20781198d26d 236 }
andrewboyson 79:f50e02fb5c94 237
andrewboyson 79:f50e02fb5c94 238 //Record the number of bytes acked by the remote host
andrewboyson 98:b977424ec7f7 239 FaultPoint++;
andrewboyson 79:f50e02fb5c94 240 pTcb->bytesAckdByRem = ackRcvdFromRem;
andrewboyson 79:f50e02fb5c94 241
andrewboyson 76:17534bde28d3 242 /* If the connection is in a synchronized state
andrewboyson 76:17534bde28d3 243 any unacceptable segment (out of window sequence number or
andrewboyson 76:17534bde28d3 244 unacceptible acknowledgment number) must elicit only an empty
andrewboyson 76:17534bde28d3 245 acknowledgment segment containing the current send-sequence number
andrewboyson 76:17534bde28d3 246 and an acknowledgment indicating the next sequence number expected
andrewboyson 76:17534bde28d3 247 to be received, and the connection remains in the same state.*/
andrewboyson 98:b977424ec7f7 248 FaultPoint++;
andrewboyson 74:c3756bfa960e 249 uint32_t seqRcvdFromRem = TcpHdrSeqNum - pTcb->remIsn;
andrewboyson 78:9d8fc88df405 250 if (seqRcvdFromRem != pTcb->bytesAckdToRem)
andrewboyson 78:9d8fc88df405 251 {
andrewboyson 79:f50e02fb5c94 252 //Only warn non keep-alives
andrewboyson 79:f50e02fb5c94 253 if (seqRcvdFromRem != 0 || pTcb->bytesAckdToRem != 1)
andrewboyson 79:f50e02fb5c94 254 {
andrewboyson 89:9b765a67699b 255 log(traceback, "seq rcvd is %d and last seq ackd was %d -> resent last ACK", seqRcvdFromRem, pTcb->bytesAckdToRem);
andrewboyson 79:f50e02fb5c94 256 }
andrewboyson 90:955f4c6e18a9 257 action = TcpResendLastAck(pSizeTx, pPacketTx, pTcb);
andrewboyson 98:b977424ec7f7 258 FaultPoint = lastFaultPoint;
andrewboyson 90:955f4c6e18a9 259 return action;
andrewboyson 78:9d8fc88df405 260 }
andrewboyson 90:955f4c6e18a9 261 //Ignore data before established
andrewboyson 98:b977424ec7f7 262 FaultPoint++;
andrewboyson 90:955f4c6e18a9 263 if (pTcb->state != TCB_ESTABLISHED && dataLength)
andrewboyson 90:955f4c6e18a9 264 {
andrewboyson 90:955f4c6e18a9 265 log(traceback, "data received before connection established -> sent reset");
andrewboyson 90:955f4c6e18a9 266 pTcb->state = TCB_EMPTY;
andrewboyson 90:955f4c6e18a9 267 action = TcpSendReset(pSizeTx, pPacketTx, pTcb);
andrewboyson 98:b977424ec7f7 268 FaultPoint = lastFaultPoint;
andrewboyson 90:955f4c6e18a9 269 return action;
andrewboyson 90:955f4c6e18a9 270 }
andrewboyson 90:955f4c6e18a9 271
andrewboyson 74:c3756bfa960e 272 //Handle FIN
andrewboyson 98:b977424ec7f7 273 FaultPoint++;
andrewboyson 74:c3756bfa960e 274 if (TcpHdrFIN) pTcb->rcvdFin = true; //When reply is all sent only a passive close is needed
andrewboyson 90:955f4c6e18a9 275
andrewboyson 90:955f4c6e18a9 276 //From now on there are no errors so display traceback if requested
andrewboyson 98:b977424ec7f7 277 FaultPoint++;
andrewboyson 90:955f4c6e18a9 278 if (traceRequested && NetTraceStack) traceback();
andrewboyson 74:c3756bfa960e 279
andrewboyson 75:603b10404183 280 //Record the number of bytes received from the remote host
andrewboyson 98:b977424ec7f7 281 FaultPoint++;
andrewboyson 76:17534bde28d3 282 pTcb->bytesRcvdFromRem += seqLengthRcvd;
andrewboyson 74:c3756bfa960e 283
andrewboyson 76:17534bde28d3 284 switch (pTcb->state) //This is the state of the connection BEFORE this packet arrived
andrewboyson 74:c3756bfa960e 285 {
andrewboyson 74:c3756bfa960e 286 case TCB_EMPTY:
andrewboyson 74:c3756bfa960e 287 pTcb->state = TCB_SYN_RECEIVED;
andrewboyson 74:c3756bfa960e 288 break;
andrewboyson 74:c3756bfa960e 289
andrewboyson 74:c3756bfa960e 290 case TCB_SYN_RECEIVED:
andrewboyson 74:c3756bfa960e 291 pTcb->state = TCB_ESTABLISHED;
andrewboyson 74:c3756bfa960e 292 break;
andrewboyson 74:c3756bfa960e 293
andrewboyson 74:c3756bfa960e 294 case TCB_ESTABLISHED:
andrewboyson 88:1ba13e6062a3 295 if (dataLength) handleReceivedData (pPacketRx, dataLength, seqRcvdFromRem - 1, pTcb);
andrewboyson 74:c3756bfa960e 296 if (pTcb->sentFin)
andrewboyson 74:c3756bfa960e 297 {
andrewboyson 77:6cb7d92c37f3 298 pTcb->state = pTcb->rcvdFin ? TCB_EMPTY : TCB_CLOSE_FIN_WAIT;
andrewboyson 74:c3756bfa960e 299 }
andrewboyson 74:c3756bfa960e 300 break;
andrewboyson 74:c3756bfa960e 301
andrewboyson 74:c3756bfa960e 302 case TCB_CLOSE_FIN_WAIT: //End of active close
andrewboyson 74:c3756bfa960e 303 if (TcpHdrFIN)
andrewboyson 74:c3756bfa960e 304 {
andrewboyson 74:c3756bfa960e 305 pTcb->state = TCB_EMPTY;//Ignore ACK to our FIN. Wait for FIN then close.
andrewboyson 74:c3756bfa960e 306 }
andrewboyson 74:c3756bfa960e 307 break;
andrewboyson 74:c3756bfa960e 308
andrewboyson 74:c3756bfa960e 309 }
andrewboyson 74:c3756bfa960e 310
andrewboyson 98:b977424ec7f7 311 FaultPoint++;
andrewboyson 90:955f4c6e18a9 312 action = TcpSend(pSizeTx, pPacketTx, pTcb);
andrewboyson 86:55bc5ddac16c 313
andrewboyson 98:b977424ec7f7 314 FaultPoint = lastFaultPoint;
andrewboyson 90:955f4c6e18a9 315 return action;
andrewboyson 74:c3756bfa960e 316 }