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arp/arp.c@151:bde6f7da1755, 2019-07-19 (annotated)

Committer:
andrewboyson
Date:
Fri Jul 19 17:48:06 2019 +0000
Revision:
151:bde6f7da1755
Parent:
136:8a65abb0dc63
Child:
172:9bc3c7b2cca1
Removed private key and certificate from semihost storage as found to be unreliable (though secure) and moved it into flash storage (reliable, simple, but visible on mbed.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 136:8a65abb0dc63 1
andrewboyson 61:aad055f1b0d1 2 #include <stdint.h>
andrewboyson 61:aad055f1b0d1 3 #include <stdbool.h>
andrewboyson 61:aad055f1b0d1 4
andrewboyson 136:8a65abb0dc63 5 #include "log.h"
andrewboyson 37:793b39683406 6 #include "action.h"
andrewboyson 136:8a65abb0dc63 7 #include "net.h"
andrewboyson 136:8a65abb0dc63 8 #include "eth.h"
andrewboyson 136:8a65abb0dc63 9 #include "mac.h"
andrewboyson 136:8a65abb0dc63 10 #include "dhcp.h"
andrewboyson 136:8a65abb0dc63 11 #include "ar4.h"
andrewboyson 136:8a65abb0dc63 12 #include "nr4.h"
andrewboyson 49:1a6336f2b3f9 13 #include "ip4addr.h"
andrewboyson 136:8a65abb0dc63 14 #include "arphdr.h"
andrewboyson 10:f0854784e960 15
andrewboyson 10:f0854784e960 16 #define REQUEST 1
andrewboyson 10:f0854784e960 17 #define REPLY 2
andrewboyson 10:f0854784e960 18
andrewboyson 43:bc028d5a6424 19 bool ArpTrace = false;
andrewboyson 43:bc028d5a6424 20
andrewboyson 22:914b970356f0 21 uint32_t ArpAddressToResolve;
andrewboyson 22:914b970356f0 22 bool ArpResolveRequestFlag = false;
andrewboyson 22:914b970356f0 23
andrewboyson 136:8a65abb0dc63 24 static void logHeader(char* pPacket)
andrewboyson 48:952dddb74b8b 25 {
andrewboyson 43:bc028d5a6424 26 if (NetTraceVerbose)
andrewboyson 43:bc028d5a6424 27 {
andrewboyson 43:bc028d5a6424 28 LogTime("ARP header\r\n");
andrewboyson 136:8a65abb0dc63 29 if (ArpHdrGetHardwareType(pPacket) == ETHERNET) Log (" hardwareType = ETHERNET\r\n");
andrewboyson 136:8a65abb0dc63 30 else LogF(" hardwareType = %d\r\n", ArpHdrGetHardwareType(pPacket));
andrewboyson 136:8a65abb0dc63 31 Log (" protocolType = "); EthProtocolLog(ArpHdrGetProtocolType (pPacket)); Log("\r\n");
andrewboyson 136:8a65abb0dc63 32 LogF(" hardwareLength = %d\r\n", ArpHdrGetHardwareLength(pPacket));
andrewboyson 136:8a65abb0dc63 33 LogF(" protocolLength = %d\r\n", ArpHdrGetProtocolLength(pPacket));
andrewboyson 136:8a65abb0dc63 34 if (ArpHdrGetOpCode(pPacket) == REQUEST) Log (" opCode = REQUEST\r\n");
andrewboyson 136:8a65abb0dc63 35 else if (ArpHdrGetOpCode(pPacket) == REPLY ) Log (" opCode = REPLY\r\n");
andrewboyson 136:8a65abb0dc63 36 else LogF(" opCode = %d\r\n", ArpHdrGetOpCode(pPacket));
andrewboyson 136:8a65abb0dc63 37 Log(" senderHardwareAddress = "); MacLog(ArpHdrPtrSenderHardwareAddr(pPacket)); Log("\r\n");
andrewboyson 136:8a65abb0dc63 38 Log(" senderProtocolAddress = "); Ip4AddressLog(ArpHdrGetSenderProtocolAddr(pPacket)); Log("\r\n");
andrewboyson 136:8a65abb0dc63 39 Log(" targetHardwareAddress = "); MacLog(ArpHdrPtrTargetHardwareAddr(pPacket)); Log("\r\n");
andrewboyson 136:8a65abb0dc63 40 Log(" targetProtocolAddress = "); Ip4AddressLog(ArpHdrGetTargetProtocolAddr(pPacket)); Log("\r\n");
andrewboyson 43:bc028d5a6424 41 }
andrewboyson 43:bc028d5a6424 42 else
andrewboyson 43:bc028d5a6424 43 {
andrewboyson 43:bc028d5a6424 44 Log("ARP header ");
andrewboyson 136:8a65abb0dc63 45 MacLog(ArpHdrPtrSenderHardwareAddr(pPacket)); Log("==");
andrewboyson 136:8a65abb0dc63 46 Ip4AddressLog(ArpHdrGetSenderProtocolAddr(pPacket)); Log(" >>> ");
andrewboyson 136:8a65abb0dc63 47 MacLog(ArpHdrPtrTargetHardwareAddr(pPacket)); Log("==");
andrewboyson 136:8a65abb0dc63 48 Ip4AddressLog(ArpHdrGetTargetProtocolAddr(pPacket)); Log("\r\n");
andrewboyson 43:bc028d5a6424 49
andrewboyson 43:bc028d5a6424 50 }
andrewboyson 43:bc028d5a6424 51 }
andrewboyson 136:8a65abb0dc63 52 static char* pHeaderTrace;
andrewboyson 48:952dddb74b8b 53 static void (*pTraceBack)(void);
andrewboyson 48:952dddb74b8b 54 static void trace()
andrewboyson 48:952dddb74b8b 55 {
andrewboyson 48:952dddb74b8b 56 pTraceBack();
andrewboyson 59:e0e556c8bd46 57 logHeader(pHeaderTrace);
andrewboyson 48:952dddb74b8b 58 }
andrewboyson 43:bc028d5a6424 59
andrewboyson 136:8a65abb0dc63 60 int ArpHandleReceivedPacket(void (*traceback)(void), char* pPacketRx, int sizeRx, char* pPacketTx, int* pSizeTx)
andrewboyson 10:f0854784e960 61 {
andrewboyson 48:952dddb74b8b 62 pTraceBack = traceback;
andrewboyson 136:8a65abb0dc63 63 pHeaderTrace = pPacketRx;
andrewboyson 59:e0e556c8bd46 64
andrewboyson 136:8a65abb0dc63 65 int16_t hardwareType = ArpHdrGetHardwareType (pPacketRx);
andrewboyson 136:8a65abb0dc63 66 int16_t protocolType = ArpHdrGetProtocolType (pPacketRx);
andrewboyson 136:8a65abb0dc63 67 int8_t hardwareLength = ArpHdrGetHardwareLength (pPacketRx);
andrewboyson 136:8a65abb0dc63 68 int8_t protocolLength = ArpHdrGetProtocolLength (pPacketRx);
andrewboyson 136:8a65abb0dc63 69 int16_t opCode = ArpHdrGetOpCode (pPacketRx);
andrewboyson 136:8a65abb0dc63 70 uint32_t targetProtocolAddress = ArpHdrGetTargetProtocolAddr(pPacketRx);
andrewboyson 48:952dddb74b8b 71
andrewboyson 10:f0854784e960 72 if (hardwareType != ETHERNET ) return DO_NOTHING; //This is not ethernet
andrewboyson 10:f0854784e960 73 if (protocolType != IPV4 ) return DO_NOTHING; //This is not IPv4
andrewboyson 10:f0854784e960 74 if (hardwareLength != 6 ) return DO_NOTHING; //This is not a MAC hardware address
andrewboyson 10:f0854784e960 75 if (protocolLength != 4 ) return DO_NOTHING; //This is not an IPv4 IP address
andrewboyson 10:f0854784e960 76 if (targetProtocolAddress != DhcpLocalIp ) return DO_NOTHING; //This packet was not addressed to us
andrewboyson 10:f0854784e960 77
andrewboyson 22:914b970356f0 78 switch (opCode)
andrewboyson 22:914b970356f0 79 {
andrewboyson 22:914b970356f0 80 case REQUEST:
andrewboyson 43:bc028d5a6424 81 if (ArpTrace)
andrewboyson 43:bc028d5a6424 82 {
andrewboyson 43:bc028d5a6424 83 if (NetTraceNewLine) Log("\r\n");
andrewboyson 43:bc028d5a6424 84 LogTime("ARP received request\r\n");
andrewboyson 44:83ce5ace337b 85 if (NetTraceStack) traceback();
andrewboyson 136:8a65abb0dc63 86 logHeader(pPacketRx);
andrewboyson 43:bc028d5a6424 87 }
andrewboyson 136:8a65abb0dc63 88 ArpHdrSetHardwareType (pPacketTx, ETHERNET );
andrewboyson 136:8a65abb0dc63 89 ArpHdrSetProtocolType (pPacketTx, IPV4 );
andrewboyson 136:8a65abb0dc63 90 ArpHdrSetHardwareLength (pPacketTx, 6 );
andrewboyson 136:8a65abb0dc63 91 ArpHdrSetProtocolLength (pPacketTx, 4 );
andrewboyson 136:8a65abb0dc63 92 ArpHdrSetOpCode (pPacketTx, REPLY );
andrewboyson 136:8a65abb0dc63 93 MacCopy(ArpHdrPtrTargetHardwareAddr(pPacketTx), ArpHdrPtrSenderHardwareAddr(pPacketRx));
andrewboyson 136:8a65abb0dc63 94 ArpHdrSetTargetProtocolAddr(pPacketTx, ArpHdrGetSenderProtocolAddr(pPacketRx));
andrewboyson 136:8a65abb0dc63 95 MacCopy(ArpHdrPtrSenderHardwareAddr(pPacketTx), MacLocal );
andrewboyson 136:8a65abb0dc63 96 ArpHdrSetSenderProtocolAddr(pPacketTx, DhcpLocalIp );
andrewboyson 136:8a65abb0dc63 97 *pSizeTx = ARP_HEADER_LENGTH;
andrewboyson 136:8a65abb0dc63 98 if (ArpTrace) logHeader(pPacketTx);
andrewboyson 43:bc028d5a6424 99 return ActionMakeFromDestAndTrace(UNICAST, ArpTrace && NetTraceStack);
andrewboyson 43:bc028d5a6424 100
andrewboyson 22:914b970356f0 101 case REPLY:
andrewboyson 43:bc028d5a6424 102 if (ArpTrace)
andrewboyson 43:bc028d5a6424 103 {
andrewboyson 43:bc028d5a6424 104 if (NetTraceNewLine) Log("\r\n");
andrewboyson 43:bc028d5a6424 105 LogTime("ARP received reply\r\n");
andrewboyson 44:83ce5ace337b 106 if (NetTraceStack) traceback();
andrewboyson 136:8a65abb0dc63 107 logHeader(pPacketRx);
andrewboyson 43:bc028d5a6424 108 }
andrewboyson 136:8a65abb0dc63 109 Ar4AddIpRecord(trace, ArpHdrPtrSenderHardwareAddr(pPacketRx), ArpHdrGetSenderProtocolAddr(pPacketRx));
andrewboyson 136:8a65abb0dc63 110 Nr4MakeRequestForNameFromIp(ArpHdrGetSenderProtocolAddr(pPacketRx));
andrewboyson 22:914b970356f0 111 return DO_NOTHING;
andrewboyson 43:bc028d5a6424 112
andrewboyson 22:914b970356f0 113 default:
andrewboyson 22:914b970356f0 114 return DO_NOTHING;
andrewboyson 22:914b970356f0 115 }
andrewboyson 22:914b970356f0 116 }
andrewboyson 136:8a65abb0dc63 117 int ArpPollForPacketToSend(char* pPacketTx, int* pSizeTx)
andrewboyson 22:914b970356f0 118 {
andrewboyson 22:914b970356f0 119 if (!ArpResolveRequestFlag) return DO_NOTHING;
andrewboyson 22:914b970356f0 120 ArpResolveRequestFlag = false;
andrewboyson 48:952dddb74b8b 121
andrewboyson 136:8a65abb0dc63 122 ArpHdrSetHardwareType (pPacketTx, ETHERNET );
andrewboyson 136:8a65abb0dc63 123 ArpHdrSetProtocolType (pPacketTx, IPV4 );
andrewboyson 136:8a65abb0dc63 124 ArpHdrSetHardwareLength (pPacketTx, 6 );
andrewboyson 136:8a65abb0dc63 125 ArpHdrSetProtocolLength (pPacketTx, 4 );
andrewboyson 136:8a65abb0dc63 126 ArpHdrSetOpCode (pPacketTx, REQUEST );
andrewboyson 136:8a65abb0dc63 127 MacClear(ArpHdrPtrTargetHardwareAddr(pPacketTx) );
andrewboyson 136:8a65abb0dc63 128 ArpHdrSetTargetProtocolAddr(pPacketTx, ArpAddressToResolve);
andrewboyson 136:8a65abb0dc63 129 MacCopy (ArpHdrPtrSenderHardwareAddr(pPacketTx), MacLocal );
andrewboyson 136:8a65abb0dc63 130 ArpHdrSetSenderProtocolAddr(pPacketTx, DhcpLocalIp );
andrewboyson 136:8a65abb0dc63 131 *pSizeTx = ARP_HEADER_LENGTH;
andrewboyson 10:f0854784e960 132
andrewboyson 43:bc028d5a6424 133 if (ArpTrace)
andrewboyson 43:bc028d5a6424 134 {
andrewboyson 43:bc028d5a6424 135 if (NetTraceNewLine) Log("\r\n");
andrewboyson 43:bc028d5a6424 136 LogTime("ARP send request\r\n");
andrewboyson 136:8a65abb0dc63 137 logHeader(pPacketTx);
andrewboyson 43:bc028d5a6424 138 }
andrewboyson 43:bc028d5a6424 139 return ActionMakeFromDestAndTrace(BROADCAST, ArpTrace && NetTraceStack);
andrewboyson 35:93c39d260a83 140 }