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

ip4/udptcp4.c@94:e2973a2c488e, 2018-12-05 (annotated)

Committer:
andrewboyson
Date:
Wed Dec 05 18:30:37 2018 +0000
Revision:
94:e2973a2c488e
Parent:
88:1ba13e6062a3
Child:
96:43eb7a110f1a
Fixed bug - incorrect MSS being sent from a polled sync: expected 1440 but had -60. Traced to buffer datalength in EthPollForPacketToSend being set to zero instead of being calculated from the buffer length - headersize.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 61:aad055f1b0d1 1 #include <stdint.h>
andrewboyson 61:aad055f1b0d1 2
andrewboyson 37:793b39683406 3 #include "log.h"
andrewboyson 37:793b39683406 4 #include "net.h"
andrewboyson 37:793b39683406 5 #include "action.h"
andrewboyson 37:793b39683406 6 #include "dhcp.h"
andrewboyson 37:793b39683406 7 #include "eth.h"
andrewboyson 37:793b39683406 8 #include "ip.h"
andrewboyson 49:1a6336f2b3f9 9 #include "ip4addr.h"
andrewboyson 74:c3756bfa960e 10 #include "tcp.h"
andrewboyson 74:c3756bfa960e 11 #include "tcprecv.h"
andrewboyson 74:c3756bfa960e 12 #include "tcpsend.h"
andrewboyson 74:c3756bfa960e 13 #include "tcphdr.h"
andrewboyson 74:c3756bfa960e 14 #include "udp.h"
andrewboyson 86:55bc5ddac16c 15 #include "ar4.h"
andrewboyson 86:55bc5ddac16c 16 #include "led.h"
andrewboyson 10:f0854784e960 17
andrewboyson 10:f0854784e960 18 static uint16_t calculateChecksum(uint8_t pro, uint32_t srcIp, uint32_t dstIp, int size, void* pPacket)
andrewboyson 10:f0854784e960 19 {
andrewboyson 10:f0854784e960 20 __packed struct pseudo
andrewboyson 10:f0854784e960 21 {
andrewboyson 10:f0854784e960 22 uint32_t src;
andrewboyson 10:f0854784e960 23 uint32_t dst;
andrewboyson 10:f0854784e960 24 uint8_t zer;
andrewboyson 10:f0854784e960 25 uint8_t pro;
andrewboyson 10:f0854784e960 26 uint16_t len;
andrewboyson 10:f0854784e960 27 } pseudo;
andrewboyson 10:f0854784e960 28
andrewboyson 10:f0854784e960 29 pseudo.src = srcIp;
andrewboyson 10:f0854784e960 30 pseudo.dst = dstIp;
andrewboyson 10:f0854784e960 31 pseudo.zer = 0;
andrewboyson 10:f0854784e960 32 pseudo.pro = pro;
andrewboyson 10:f0854784e960 33 pseudo.len = NetToHost16(size);
andrewboyson 10:f0854784e960 34
andrewboyson 10:f0854784e960 35 return NetCheckSumTwo(sizeof(pseudo), &pseudo, size, pPacket);
andrewboyson 10:f0854784e960 36 }
andrewboyson 10:f0854784e960 37 static void finalisePacket(uint8_t pro, int action, void* pPacket, int size, uint32_t* pSrcIp, uint32_t* pDstIp)
andrewboyson 10:f0854784e960 38 {
andrewboyson 10:f0854784e960 39 if (!action) return;
andrewboyson 10:f0854784e960 40
andrewboyson 49:1a6336f2b3f9 41 Ip4AddressFromDest(ActionGetDestPart(action), pDstIp);
andrewboyson 10:f0854784e960 42 *pSrcIp = DhcpLocalIp;
andrewboyson 10:f0854784e960 43
andrewboyson 10:f0854784e960 44 switch (pro)
andrewboyson 10:f0854784e960 45 {
andrewboyson 74:c3756bfa960e 46 case TCP: TcpHdrWriteToPacket(pPacket); break;
andrewboyson 10:f0854784e960 47 case UDP: UdpMakeHeader(size, pPacket); break;
andrewboyson 10:f0854784e960 48 }
andrewboyson 10:f0854784e960 49
andrewboyson 10:f0854784e960 50 uint16_t checksum = calculateChecksum(pro, *pSrcIp, *pDstIp, size, pPacket);
andrewboyson 10:f0854784e960 51
andrewboyson 10:f0854784e960 52 switch (pro)
andrewboyson 10:f0854784e960 53 {
andrewboyson 74:c3756bfa960e 54 case TCP: TcpHdrAddChecksumToPacket(pPacket, checksum); break;
andrewboyson 10:f0854784e960 55 case UDP: UdpAddChecksum(pPacket, checksum); break;
andrewboyson 10:f0854784e960 56 }
andrewboyson 10:f0854784e960 57
andrewboyson 37:793b39683406 58 if (ActionGetTracePart(action))
andrewboyson 11:c051adb70c5a 59 {
andrewboyson 37:793b39683406 60 switch (pro)
andrewboyson 37:793b39683406 61 {
andrewboyson 73:43e3d7fb3d60 62 case TCP: TcpHdrLog(0); break;
andrewboyson 56:35117a8b5c65 63 case UDP: UdpLogHeader(0); break;
andrewboyson 37:793b39683406 64 }
andrewboyson 11:c051adb70c5a 65 }
andrewboyson 10:f0854784e960 66 }
andrewboyson 10:f0854784e960 67
andrewboyson 37:793b39683406 68 static void (*pTraceBack)(void);
andrewboyson 37:793b39683406 69 static int tracePacketProtocol;
andrewboyson 37:793b39683406 70 static uint16_t calculatedChecksum;
andrewboyson 37:793b39683406 71 static void trace()
andrewboyson 37:793b39683406 72 {
andrewboyson 37:793b39683406 73 pTraceBack();
andrewboyson 37:793b39683406 74 switch(tracePacketProtocol)
andrewboyson 37:793b39683406 75 {
andrewboyson 56:35117a8b5c65 76 case UDP: UdpLogHeader(calculatedChecksum); break;
andrewboyson 73:43e3d7fb3d60 77 case TCP: TcpHdrLog(calculatedChecksum); break;
andrewboyson 37:793b39683406 78 default: LogTimeF("UdpTcp4 - traceback unrecognised protocol %d\r\n", tracePacketProtocol); break;
andrewboyson 37:793b39683406 79 }
andrewboyson 37:793b39683406 80 }
andrewboyson 74:c3756bfa960e 81 int Tcp4HandleReceivedPacket(void (*traceback)(void), void* pPacketRx, int sizeRx, void* pPacketTx, int* pSizeTx, uint32_t* pSrcIp, uint32_t* pDstIp, int remArIndex)
andrewboyson 10:f0854784e960 82 {
andrewboyson 88:1ba13e6062a3 83 Led3Set(true);
andrewboyson 37:793b39683406 84 pTraceBack = traceback;
andrewboyson 37:793b39683406 85 tracePacketProtocol = TCP;
andrewboyson 59:e0e556c8bd46 86 calculatedChecksum = calculateChecksum(TCP, *pSrcIp, *pDstIp, sizeRx, pPacketRx);
andrewboyson 10:f0854784e960 87
andrewboyson 80:4ef1500fca1d 88 int action = TcpHandleReceivedPacket(trace, sizeRx, pPacketRx, pSizeTx, pPacketTx, IPV4, remArIndex, 0);
andrewboyson 10:f0854784e960 89
andrewboyson 10:f0854784e960 90 *pDstIp = *pSrcIp;
andrewboyson 10:f0854784e960 91
andrewboyson 59:e0e556c8bd46 92 finalisePacket(TCP, action, pPacketTx, *pSizeTx, pSrcIp, pDstIp);
andrewboyson 10:f0854784e960 93
andrewboyson 88:1ba13e6062a3 94 Led3Set(false);
andrewboyson 10:f0854784e960 95 return action;
andrewboyson 10:f0854784e960 96 }
andrewboyson 10:f0854784e960 97
andrewboyson 59:e0e556c8bd46 98 int Udp4HandleReceivedPacket(void (*traceback)(void), void* pPacketRx, int sizeRx, void* pPacketTx, int* pSizeTx, uint32_t* pSrcIp, uint32_t* pDstIp)
andrewboyson 10:f0854784e960 99 {
andrewboyson 37:793b39683406 100 pTraceBack = traceback;
andrewboyson 37:793b39683406 101 tracePacketProtocol = UDP;
andrewboyson 59:e0e556c8bd46 102 calculatedChecksum = calculateChecksum(UDP, *pSrcIp, *pDstIp, sizeRx, pPacketRx);
andrewboyson 59:e0e556c8bd46 103
andrewboyson 59:e0e556c8bd46 104 int action = UdpHandleReceivedPacket(trace, sizeRx, pPacketRx, pSizeTx, pPacketTx);
andrewboyson 10:f0854784e960 105
andrewboyson 10:f0854784e960 106 *pDstIp = *pSrcIp;
andrewboyson 10:f0854784e960 107
andrewboyson 59:e0e556c8bd46 108 finalisePacket(UDP, action, pPacketTx, *pSizeTx, pSrcIp, pDstIp); //Note that the ports are reversed here
andrewboyson 86:55bc5ddac16c 109
andrewboyson 10:f0854784e960 110 return action;
andrewboyson 10:f0854784e960 111 }
andrewboyson 71:736a5747ade1 112 int Tcp4PollForPacketToSend(void* pPacket, int* pSize, uint32_t* pSrcIp, uint32_t* pDstIp)
andrewboyson 71:736a5747ade1 113 {
andrewboyson 74:c3756bfa960e 114 int remArIndex = -1;
andrewboyson 80:4ef1500fca1d 115 int action = TcpPollForPacketToSend(pSize, pPacket, IPV4, &remArIndex, NULL);
andrewboyson 74:c3756bfa960e 116 if (action && remArIndex >= 0) *pDstIp = Ar4IndexToIp(remArIndex);
andrewboyson 71:736a5747ade1 117
andrewboyson 71:736a5747ade1 118 finalisePacket(TCP, action, pPacket, *pSize, pSrcIp, pDstIp);
andrewboyson 71:736a5747ade1 119
andrewboyson 71:736a5747ade1 120 return action;
andrewboyson 71:736a5747ade1 121 }
andrewboyson 10:f0854784e960 122 int Udp4PollForPacketToSend(void* pPacket, int* pSize, uint32_t* pSrcIp, uint32_t* pDstIp)
andrewboyson 10:f0854784e960 123 {
andrewboyson 10:f0854784e960 124 int action = UdpPollForPacketToSend(IPV4, pSize, pPacket);
andrewboyson 10:f0854784e960 125
andrewboyson 10:f0854784e960 126 finalisePacket(UDP, action, pPacket, *pSize, pSrcIp, pDstIp);
andrewboyson 10:f0854784e960 127
andrewboyson 10:f0854784e960 128 return action;
andrewboyson 10:f0854784e960 129 }