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@146:0fc66d610fd6, 2019-05-15 (annotated)

Committer:
andrewboyson
Date:
Wed May 15 15:33:15 2019 +0000
Revision:
146:0fc66d610fd6
Parent:
145:206bf0d073c7
Child:
147:a6093b52e654
Tidied the http shim

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 146:0fc66d610fd6 14 #include "httpshim.h"
andrewboyson 74:c3756bfa960e 15 #include "led.h"
andrewboyson 93:580fc113d9e9 16 #include "mstimer.h"
andrewboyson 142:a8c0890a58d1 17 #include "restart.h"
andrewboyson 89:9b765a67699b 18
andrewboyson 89:9b765a67699b 19 static void log(void (*traceback)(void), char* fmt, ...)
andrewboyson 74:c3756bfa960e 20 {
andrewboyson 78:9d8fc88df405 21 if (TcpTrace)
andrewboyson 78:9d8fc88df405 22 {
andrewboyson 78:9d8fc88df405 23 if (NetTraceNewLine) Log("\r\n");
andrewboyson 89:9b765a67699b 24 LogTimeF("TCP port %hu - ", TcpHdrSrcPort);
andrewboyson 75:603b10404183 25 va_list argptr;
andrewboyson 75:603b10404183 26 va_start(argptr, fmt);
andrewboyson 75:603b10404183 27 LogV(fmt, argptr);
andrewboyson 75:603b10404183 28 va_end(argptr);
andrewboyson 75:603b10404183 29 Log("\r\n");
andrewboyson 75:603b10404183 30 if (NetTraceStack) traceback();
andrewboyson 75:603b10404183 31 }
andrewboyson 75:603b10404183 32 }
andrewboyson 75:603b10404183 33
andrewboyson 88:1ba13e6062a3 34 static void handleSyn(void *pPacket, int ipType, int remArIndex, int locMss, struct tcb* pTcb)
andrewboyson 74:c3756bfa960e 35 {
andrewboyson 74:c3756bfa960e 36 //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 37 int remMss = TcpHdrMssGet();
andrewboyson 74:c3756bfa960e 38 pTcb->remMss = remMss ? remMss : 536; //default MSS for IPv4 [576 - 20(TCP) - 20(IP)];
andrewboyson 74:c3756bfa960e 39 if (pTcb->remMss > locMss) pTcb->remMss = locMss;
andrewboyson 74:c3756bfa960e 40
andrewboyson 93:580fc113d9e9 41 pTcb->timeSendsBeingAcked = MsTimerCount;
andrewboyson 82:20781198d26d 42 pTcb->countSendsNotAcked = 0;
andrewboyson 79:f50e02fb5c94 43 pTcb->rcvdFin = false;
andrewboyson 79:f50e02fb5c94 44 pTcb->sentFin = false;
andrewboyson 144:6bd5c54efc7d 45 pTcb->appStarted = false;
andrewboyson 144:6bd5c54efc7d 46 for (char* p = pTcb->appData; p < pTcb->appData + TCB_APP_STATE_BYTES; p++) *p = 0;
andrewboyson 79:f50e02fb5c94 47 pTcb->remIsn = TcpHdrSeqNum;
andrewboyson 79:f50e02fb5c94 48 pTcb->locIsn = TcbGetIsn();
andrewboyson 79:f50e02fb5c94 49 pTcb->bytesRcvdFromRem = 0;
andrewboyson 79:f50e02fb5c94 50 pTcb->bytesAckdByRem = 0;
andrewboyson 79:f50e02fb5c94 51 pTcb->bytesAckdToRem = 0;
andrewboyson 79:f50e02fb5c94 52 pTcb->bytesSentToRem = 0;
andrewboyson 74:c3756bfa960e 53 }
andrewboyson 88:1ba13e6062a3 54 static void handleReceivedData(void* pPacket, int dataLength, uint32_t position, struct tcb* pTcb)
andrewboyson 74:c3756bfa960e 55 {
andrewboyson 74:c3756bfa960e 56 pTcb->window = TcpHdrWindow;
andrewboyson 74:c3756bfa960e 57 char* pData = (char*)pPacket + TcpHdrSizeGet();
andrewboyson 74:c3756bfa960e 58 switch (pTcb->locPort)
andrewboyson 74:c3756bfa960e 59 {
andrewboyson 146:0fc66d610fd6 60 case 80: HttpShimRequest(dataLength, pData, position, pTcb->appData, false); break;
andrewboyson 146:0fc66d610fd6 61 case 443: HttpShimRequest(dataLength, pData, position, pTcb->appData, true ); break;
andrewboyson 146:0fc66d610fd6 62 default: break;
andrewboyson 74:c3756bfa960e 63 }
andrewboyson 74:c3756bfa960e 64 }
andrewboyson 90:955f4c6e18a9 65 static int sendResetFromPacket(int* pSizeTx, void* pPacketTx, int ipType, int remArIndex, int locIpScope, int seqLengthRcvd)
andrewboyson 89:9b765a67699b 66 {
andrewboyson 90:955f4c6e18a9 67 /*RFC793 p36 If the connection does not exist (CLOSED) then a reset is sent
andrewboyson 90:955f4c6e18a9 68 in response to any incoming segment except another reset.
andrewboyson 90:955f4c6e18a9 69 If the incoming segment has an ACK field, the reset takes its sequence number from the ACK field of the segment,
andrewboyson 90:955f4c6e18a9 70 otherwise the reset has sequence number zero
andrewboyson 90:955f4c6e18a9 71 and
andrewboyson 90:955f4c6e18a9 72 the ACK field is set to the sum of the sequence number and segment length of the incoming segment.
andrewboyson 90:955f4c6e18a9 73 The connection remains in the CLOSED state.
andrewboyson 90:955f4c6e18a9 74 In TcpSendReset TcpHdrAckNum = pTcb->bytesAckdToRem + pTcb->remIsn; //Set up the acknowledgement field ready to send
andrewboyson 90:955f4c6e18a9 75 TcpHdrSeqNum = pTcb->bytesSentToRem + pTcb->locIsn; //Set up the start of the message before adding the bytes sent
andrewboyson 90:955f4c6e18a9 76 */
andrewboyson 90:955f4c6e18a9 77
andrewboyson 89:9b765a67699b 78 struct tcb tcb;
andrewboyson 89:9b765a67699b 79 struct tcb* pTcb = &tcb;
andrewboyson 93:580fc113d9e9 80 pTcb->timeLastRcvd = MsTimerCount;
andrewboyson 89:9b765a67699b 81 pTcb->remArIndex = remArIndex;
andrewboyson 89:9b765a67699b 82 pTcb->ipType = ipType;
andrewboyson 89:9b765a67699b 83 pTcb->locIpScope = locIpScope;
andrewboyson 89:9b765a67699b 84 pTcb->remPort = TcpHdrSrcPort;
andrewboyson 89:9b765a67699b 85 pTcb->locPort = TcpHdrDstPort;
andrewboyson 89:9b765a67699b 86 pTcb->window = TcpHdrWindow;
andrewboyson 89:9b765a67699b 87 pTcb->state = TCB_EMPTY;
andrewboyson 89:9b765a67699b 88
andrewboyson 93:580fc113d9e9 89 pTcb->timeSendsBeingAcked = MsTimerCount;
andrewboyson 90:955f4c6e18a9 90 pTcb->countSendsNotAcked = 0;
andrewboyson 90:955f4c6e18a9 91 pTcb->rcvdFin = false;
andrewboyson 90:955f4c6e18a9 92 pTcb->sentFin = false;
andrewboyson 144:6bd5c54efc7d 93 pTcb->appStarted = false;
andrewboyson 144:6bd5c54efc7d 94 for (char* p = pTcb->appData; p < pTcb->appData + TCB_APP_STATE_BYTES; p++) *p = 0;
andrewboyson 90:955f4c6e18a9 95 pTcb->remIsn = TcpHdrSeqNum + seqLengthRcvd; //Ack number
andrewboyson 90:955f4c6e18a9 96 pTcb->locIsn = TcpHdrACK ? TcpHdrAckNum : 0; //Seq number
andrewboyson 90:955f4c6e18a9 97 pTcb->bytesRcvdFromRem = 0;
andrewboyson 90:955f4c6e18a9 98 pTcb->bytesAckdByRem = 0;
andrewboyson 90:955f4c6e18a9 99 pTcb->bytesAckdToRem = 0;
andrewboyson 90:955f4c6e18a9 100 pTcb->bytesSentToRem = 0;
andrewboyson 90:955f4c6e18a9 101
andrewboyson 89:9b765a67699b 102 return TcpSendReset(pSizeTx, pPacketTx, pTcb);
andrewboyson 89:9b765a67699b 103 }
andrewboyson 74:c3756bfa960e 104
andrewboyson 80:4ef1500fca1d 105 int TcpHandleReceivedPacket(void (*traceback)(void), int sizeRx, void* pPacketRx, int* pSizeTx, void* pPacketTx, int ipType, int remArIndex, int locIpScope)
andrewboyson 74:c3756bfa960e 106 {
andrewboyson 142:a8c0890a58d1 107 int lastRestartPoint = RestartPoint;
andrewboyson 142:a8c0890a58d1 108 RestartPoint = FAULT_POINT_TcpHandleReceivedPacket;
andrewboyson 97:d91f7db00235 109
andrewboyson 90:955f4c6e18a9 110 int action = DO_NOTHING;
andrewboyson 89:9b765a67699b 111 bool traceRequested = false;
andrewboyson 86:55bc5ddac16c 112
andrewboyson 89:9b765a67699b 113 TcpHdrReadFromPacket(pPacketRx);
andrewboyson 89:9b765a67699b 114
andrewboyson 78:9d8fc88df405 115 if (remArIndex < 0)
andrewboyson 78:9d8fc88df405 116 {
andrewboyson 89:9b765a67699b 117 log(traceback, "invalid remote AR index %d -> ignored packet", remArIndex);
andrewboyson 142:a8c0890a58d1 118 RestartPoint = lastRestartPoint;
andrewboyson 78:9d8fc88df405 119 return DO_NOTHING;
andrewboyson 78:9d8fc88df405 120 }
andrewboyson 142:a8c0890a58d1 121 RestartPoint += 100;
andrewboyson 78:9d8fc88df405 122
andrewboyson 74:c3756bfa960e 123 int dataLength = sizeRx - TcpHdrSizeGet();
andrewboyson 74:c3756bfa960e 124 int locMss = *pSizeTx - TcpHdrSizeGet();
andrewboyson 74:c3756bfa960e 125
andrewboyson 90:955f4c6e18a9 126 //Calculate the sequence length of the received packet
andrewboyson 90:955f4c6e18a9 127 int seqLengthRcvd = 0;
andrewboyson 90:955f4c6e18a9 128 if (TcpHdrSYN) seqLengthRcvd += 1; //Add one to acknowledge the SYN
andrewboyson 90:955f4c6e18a9 129 seqLengthRcvd += dataLength; //Add the number of bytes received
andrewboyson 90:955f4c6e18a9 130 if (TcpHdrFIN) seqLengthRcvd += 1; //Add one to acknowledge the FIN
andrewboyson 90:955f4c6e18a9 131
andrewboyson 74:c3756bfa960e 132 //Filter out unwanted links
andrewboyson 142:a8c0890a58d1 133 RestartPoint++;
andrewboyson 74:c3756bfa960e 134 switch (TcpHdrDstPort)
andrewboyson 74:c3756bfa960e 135 {
andrewboyson 74:c3756bfa960e 136 case 80:
andrewboyson 146:0fc66d610fd6 137 if (HttpShimGetTrace())
andrewboyson 74:c3756bfa960e 138 {
andrewboyson 74:c3756bfa960e 139 if (NetTraceNewLine) Log("\r\n");
andrewboyson 74:c3756bfa960e 140 LogTime("HTTP server request\r\n");
andrewboyson 89:9b765a67699b 141 traceRequested = true;
andrewboyson 74:c3756bfa960e 142 }
andrewboyson 74:c3756bfa960e 143 break;
andrewboyson 74:c3756bfa960e 144
andrewboyson 111:3600389d1add 145 case 443:
andrewboyson 146:0fc66d610fd6 146 if (HttpShimGetTrace())
andrewboyson 111:3600389d1add 147 {
andrewboyson 111:3600389d1add 148 if (NetTraceNewLine) Log("\r\n");
andrewboyson 111:3600389d1add 149 LogTime("HTTPS server request\r\n");
andrewboyson 111:3600389d1add 150 traceRequested = true;
andrewboyson 111:3600389d1add 151 }
andrewboyson 111:3600389d1add 152 break;
andrewboyson 111:3600389d1add 153
andrewboyson 89:9b765a67699b 154 default: //Send reset if unknown port
andrewboyson 89:9b765a67699b 155 log(traceback, "unhandled local port %hu -> sent reset", TcpHdrDstPort);
andrewboyson 90:955f4c6e18a9 156 action = sendResetFromPacket(pSizeTx, pPacketTx, ipType, remArIndex, locIpScope, seqLengthRcvd);
andrewboyson 142:a8c0890a58d1 157 RestartPoint = lastRestartPoint;
andrewboyson 90:955f4c6e18a9 158 return action;
andrewboyson 74:c3756bfa960e 159 }
andrewboyson 74:c3756bfa960e 160
andrewboyson 76:17534bde28d3 161 //Get the Transmission Control Block
andrewboyson 142:a8c0890a58d1 162 RestartPoint++;
andrewboyson 88:1ba13e6062a3 163 struct tcb* pTcb = TcbGetExisting(ipType, remArIndex, locIpScope, TcpHdrSrcPort, TcpHdrDstPort);
andrewboyson 76:17534bde28d3 164 if (!pTcb) pTcb = TcbGetEmpty();
andrewboyson 89:9b765a67699b 165 if (!pTcb) //send reset if no more tcbs are available
andrewboyson 76:17534bde28d3 166 {
andrewboyson 89:9b765a67699b 167 log(traceback, "no more tcbs available -> sent reset");
andrewboyson 90:955f4c6e18a9 168 action = sendResetFromPacket(pSizeTx, pPacketTx, ipType, remArIndex, locIpScope, seqLengthRcvd);
andrewboyson 142:a8c0890a58d1 169 RestartPoint = lastRestartPoint;
andrewboyson 90:955f4c6e18a9 170 return action;
andrewboyson 76:17534bde28d3 171 }
andrewboyson 93:580fc113d9e9 172 pTcb->timeLastRcvd = MsTimerCount;
andrewboyson 76:17534bde28d3 173 pTcb->remArIndex = remArIndex;
andrewboyson 76:17534bde28d3 174 pTcb->ipType = ipType;
andrewboyson 81:50bfdd512f23 175 pTcb->locIpScope = locIpScope;
andrewboyson 76:17534bde28d3 176 pTcb->remPort = TcpHdrSrcPort;
andrewboyson 76:17534bde28d3 177 pTcb->locPort = TcpHdrDstPort;
andrewboyson 76:17534bde28d3 178 pTcb->window = TcpHdrWindow;
andrewboyson 75:603b10404183 179
andrewboyson 74:c3756bfa960e 180 //Handle request to reset
andrewboyson 142:a8c0890a58d1 181 RestartPoint++;
andrewboyson 74:c3756bfa960e 182 if (TcpHdrRST)
andrewboyson 74:c3756bfa960e 183 {
andrewboyson 76:17534bde28d3 184 if (pTcb->state)
andrewboyson 74:c3756bfa960e 185 {
andrewboyson 89:9b765a67699b 186 log(traceback, "received reset -> reaped TCB");
andrewboyson 75:603b10404183 187 pTcb->state = TCB_EMPTY;
andrewboyson 74:c3756bfa960e 188 }
andrewboyson 142:a8c0890a58d1 189 RestartPoint = lastRestartPoint;
andrewboyson 74:c3756bfa960e 190 return DO_NOTHING; //Don't reply
andrewboyson 74:c3756bfa960e 191 }
andrewboyson 74:c3756bfa960e 192
andrewboyson 74:c3756bfa960e 193 //Handle request to synchronise
andrewboyson 142:a8c0890a58d1 194 RestartPoint++;
andrewboyson 74:c3756bfa960e 195 if (TcpHdrSYN)
andrewboyson 74:c3756bfa960e 196 {
andrewboyson 76:17534bde28d3 197 if (pTcb->state)
andrewboyson 75:603b10404183 198 {
andrewboyson 89:9b765a67699b 199 log(traceback, "received a SYN on an open connection -> sent reset");
andrewboyson 75:603b10404183 200 pTcb->state = TCB_EMPTY;
andrewboyson 90:955f4c6e18a9 201 action = TcpSendReset(pSizeTx, pPacketTx, pTcb);
andrewboyson 142:a8c0890a58d1 202 RestartPoint = lastRestartPoint;
andrewboyson 90:955f4c6e18a9 203 return action;
andrewboyson 75:603b10404183 204 }
andrewboyson 76:17534bde28d3 205 else
andrewboyson 75:603b10404183 206 {
andrewboyson 88:1ba13e6062a3 207 handleSyn(pPacketRx, ipType, remArIndex, locMss, pTcb);
andrewboyson 75:603b10404183 208 }
andrewboyson 74:c3756bfa960e 209 }
andrewboyson 74:c3756bfa960e 210
andrewboyson 90:955f4c6e18a9 211 //Handle non SYN packet on an empty connection
andrewboyson 142:a8c0890a58d1 212 RestartPoint++;
andrewboyson 76:17534bde28d3 213 if (!TcpHdrSYN && !pTcb->state)
andrewboyson 76:17534bde28d3 214 {
andrewboyson 90:955f4c6e18a9 215
andrewboyson 89:9b765a67699b 216 log(traceback, "non SYN packet received on a closed connection -> sent reset");
andrewboyson 78:9d8fc88df405 217 pTcb->state = TCB_EMPTY;
andrewboyson 90:955f4c6e18a9 218 action = sendResetFromPacket(pSizeTx, pPacketTx, ipType, remArIndex, locIpScope, seqLengthRcvd);
andrewboyson 142:a8c0890a58d1 219 RestartPoint = lastRestartPoint;
andrewboyson 90:955f4c6e18a9 220 return action;
andrewboyson 76:17534bde28d3 221 }
andrewboyson 76:17534bde28d3 222
andrewboyson 79:f50e02fb5c94 223 //Check if the acks of bytes sent has progressed and reset the timer
andrewboyson 142:a8c0890a58d1 224 RestartPoint++;
andrewboyson 91:879545b19260 225 uint32_t ackRcvdFromRem = TcpHdrACK ? TcpHdrAckNum - pTcb->locIsn : 0;
andrewboyson 82:20781198d26d 226 if (ackRcvdFromRem > pTcb->bytesAckdByRem)
andrewboyson 82:20781198d26d 227 {
andrewboyson 93:580fc113d9e9 228 pTcb->timeSendsBeingAcked = MsTimerCount;
andrewboyson 82:20781198d26d 229 pTcb->countSendsNotAcked = 0;
andrewboyson 82:20781198d26d 230 }
andrewboyson 79:f50e02fb5c94 231
andrewboyson 79:f50e02fb5c94 232 //Record the number of bytes acked by the remote host
andrewboyson 142:a8c0890a58d1 233 RestartPoint++;
andrewboyson 79:f50e02fb5c94 234 pTcb->bytesAckdByRem = ackRcvdFromRem;
andrewboyson 79:f50e02fb5c94 235
andrewboyson 76:17534bde28d3 236 /* If the connection is in a synchronized state
andrewboyson 76:17534bde28d3 237 any unacceptable segment (out of window sequence number or
andrewboyson 76:17534bde28d3 238 unacceptible acknowledgment number) must elicit only an empty
andrewboyson 76:17534bde28d3 239 acknowledgment segment containing the current send-sequence number
andrewboyson 76:17534bde28d3 240 and an acknowledgment indicating the next sequence number expected
andrewboyson 76:17534bde28d3 241 to be received, and the connection remains in the same state.*/
andrewboyson 142:a8c0890a58d1 242 RestartPoint++;
andrewboyson 74:c3756bfa960e 243 uint32_t seqRcvdFromRem = TcpHdrSeqNum - pTcb->remIsn;
andrewboyson 78:9d8fc88df405 244 if (seqRcvdFromRem != pTcb->bytesAckdToRem)
andrewboyson 78:9d8fc88df405 245 {
andrewboyson 79:f50e02fb5c94 246 //Only warn non keep-alives
andrewboyson 79:f50e02fb5c94 247 if (seqRcvdFromRem != 0 || pTcb->bytesAckdToRem != 1)
andrewboyson 79:f50e02fb5c94 248 {
andrewboyson 89:9b765a67699b 249 log(traceback, "seq rcvd is %d and last seq ackd was %d -> resent last ACK", seqRcvdFromRem, pTcb->bytesAckdToRem);
andrewboyson 79:f50e02fb5c94 250 }
andrewboyson 90:955f4c6e18a9 251 action = TcpResendLastAck(pSizeTx, pPacketTx, pTcb);
andrewboyson 142:a8c0890a58d1 252 RestartPoint = lastRestartPoint;
andrewboyson 90:955f4c6e18a9 253 return action;
andrewboyson 78:9d8fc88df405 254 }
andrewboyson 90:955f4c6e18a9 255 //Ignore data before established
andrewboyson 142:a8c0890a58d1 256 RestartPoint++;
andrewboyson 90:955f4c6e18a9 257 if (pTcb->state != TCB_ESTABLISHED && dataLength)
andrewboyson 90:955f4c6e18a9 258 {
andrewboyson 90:955f4c6e18a9 259 log(traceback, "data received before connection established -> sent reset");
andrewboyson 90:955f4c6e18a9 260 pTcb->state = TCB_EMPTY;
andrewboyson 90:955f4c6e18a9 261 action = TcpSendReset(pSizeTx, pPacketTx, pTcb);
andrewboyson 142:a8c0890a58d1 262 RestartPoint = lastRestartPoint;
andrewboyson 90:955f4c6e18a9 263 return action;
andrewboyson 90:955f4c6e18a9 264 }
andrewboyson 90:955f4c6e18a9 265
andrewboyson 74:c3756bfa960e 266 //Handle FIN
andrewboyson 142:a8c0890a58d1 267 RestartPoint++;
andrewboyson 74:c3756bfa960e 268 if (TcpHdrFIN) pTcb->rcvdFin = true; //When reply is all sent only a passive close is needed
andrewboyson 90:955f4c6e18a9 269
andrewboyson 90:955f4c6e18a9 270 //From now on there are no errors so display traceback if requested
andrewboyson 142:a8c0890a58d1 271 RestartPoint++;
andrewboyson 90:955f4c6e18a9 272 if (traceRequested && NetTraceStack) traceback();
andrewboyson 74:c3756bfa960e 273
andrewboyson 75:603b10404183 274 //Record the number of bytes received from the remote host
andrewboyson 142:a8c0890a58d1 275 RestartPoint++;
andrewboyson 76:17534bde28d3 276 pTcb->bytesRcvdFromRem += seqLengthRcvd;
andrewboyson 74:c3756bfa960e 277
andrewboyson 76:17534bde28d3 278 switch (pTcb->state) //This is the state of the connection BEFORE this packet arrived
andrewboyson 74:c3756bfa960e 279 {
andrewboyson 74:c3756bfa960e 280 case TCB_EMPTY:
andrewboyson 74:c3756bfa960e 281 pTcb->state = TCB_SYN_RECEIVED;
andrewboyson 74:c3756bfa960e 282 break;
andrewboyson 74:c3756bfa960e 283
andrewboyson 74:c3756bfa960e 284 case TCB_SYN_RECEIVED:
andrewboyson 74:c3756bfa960e 285 pTcb->state = TCB_ESTABLISHED;
andrewboyson 74:c3756bfa960e 286 break;
andrewboyson 74:c3756bfa960e 287
andrewboyson 74:c3756bfa960e 288 case TCB_ESTABLISHED:
andrewboyson 144:6bd5c54efc7d 289 if (dataLength)
andrewboyson 144:6bd5c54efc7d 290 {
andrewboyson 144:6bd5c54efc7d 291 handleReceivedData(pPacketRx, dataLength, seqRcvdFromRem - 1, pTcb);
andrewboyson 144:6bd5c54efc7d 292 pTcb->appStarted = true;
andrewboyson 144:6bd5c54efc7d 293 }
andrewboyson 74:c3756bfa960e 294 if (pTcb->sentFin)
andrewboyson 74:c3756bfa960e 295 {
andrewboyson 77:6cb7d92c37f3 296 pTcb->state = pTcb->rcvdFin ? TCB_EMPTY : TCB_CLOSE_FIN_WAIT;
andrewboyson 74:c3756bfa960e 297 }
andrewboyson 74:c3756bfa960e 298 break;
andrewboyson 74:c3756bfa960e 299
andrewboyson 74:c3756bfa960e 300 case TCB_CLOSE_FIN_WAIT: //End of active close
andrewboyson 74:c3756bfa960e 301 if (TcpHdrFIN)
andrewboyson 74:c3756bfa960e 302 {
andrewboyson 74:c3756bfa960e 303 pTcb->state = TCB_EMPTY;//Ignore ACK to our FIN. Wait for FIN then close.
andrewboyson 74:c3756bfa960e 304 }
andrewboyson 74:c3756bfa960e 305 break;
andrewboyson 74:c3756bfa960e 306
andrewboyson 74:c3756bfa960e 307 }
andrewboyson 74:c3756bfa960e 308
andrewboyson 142:a8c0890a58d1 309 RestartPoint++;
andrewboyson 90:955f4c6e18a9 310 action = TcpSend(pSizeTx, pPacketTx, pTcb);
andrewboyson 86:55bc5ddac16c 311
andrewboyson 142:a8c0890a58d1 312 RestartPoint = lastRestartPoint;
andrewboyson 90:955f4c6e18a9 313 return action;
andrewboyson 74:c3756bfa960e 314 }