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@111:3600389d1add, 2019-01-20 (annotated)

Committer:
andrewboyson
Date:
Sun Jan 20 20:31:41 2019 +0000
Revision:
111:3600389d1add
Parent:
98:b977424ec7f7
Child:
126:62edacc9f14d
Started to add HTTPS. Not going to work as cannot get a free certificate for an internal server name.

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