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ip6/icmp/icmp6.cpp@57:e0fb648acf48, 2017-11-28 (annotated)

Committer:
andrewboyson
Date:
Tue Nov 28 17:05:46 2017 +0000
Revision:
57:e0fb648acf48
Parent:
49:1a6336f2b3f9
Child:
59:e0e556c8bd46
Added TFTP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 57:e0fb648acf48 1 #include "mbed.h"
andrewboyson 57:e0fb648acf48 2 #include "log.h"
andrewboyson 57:e0fb648acf48 3 #include "net.h"
andrewboyson 57:e0fb648acf48 4 #include "action.h"
andrewboyson 57:e0fb648acf48 5 #include "ns.h"
andrewboyson 57:e0fb648acf48 6 #include "ra.h"
andrewboyson 57:e0fb648acf48 7 #include "rs.h"
andrewboyson 57:e0fb648acf48 8 #include "ip.h"
andrewboyson 49:1a6336f2b3f9 9 #include "ip6addr.h"
andrewboyson 57:e0fb648acf48 10 #include "slaac.h"
andrewboyson 57:e0fb648acf48 11 #include "echo6.h"
andrewboyson 57:e0fb648acf48 12 #include "dest6.h"
andrewboyson 43:bc028d5a6424 13
andrewboyson 43:bc028d5a6424 14 #define HEADER_LENGTH 4
andrewboyson 43:bc028d5a6424 15 __packed struct header
andrewboyson 43:bc028d5a6424 16 {
andrewboyson 43:bc028d5a6424 17 uint8_t type;
andrewboyson 43:bc028d5a6424 18 uint8_t code;
andrewboyson 43:bc028d5a6424 19 uint16_t checksum;
andrewboyson 43:bc028d5a6424 20 };
andrewboyson 43:bc028d5a6424 21 static uint8_t type;
andrewboyson 43:bc028d5a6424 22 static uint8_t code;
andrewboyson 43:bc028d5a6424 23 static uint16_t checksum;
andrewboyson 43:bc028d5a6424 24 static uint16_t calculatedChecksum;
andrewboyson 43:bc028d5a6424 25 static int dataLength;
andrewboyson 43:bc028d5a6424 26 static void* pData;
andrewboyson 43:bc028d5a6424 27
andrewboyson 47:73af5c0b0dc2 28 static void logType(uint8_t type)
andrewboyson 43:bc028d5a6424 29 {
andrewboyson 43:bc028d5a6424 30 switch (type)
andrewboyson 43:bc028d5a6424 31 {
andrewboyson 49:1a6336f2b3f9 32 case 1: Log ("Destination unreacheable" ); break;
andrewboyson 49:1a6336f2b3f9 33 case 128: Log ("Echo Request" ); break;
andrewboyson 49:1a6336f2b3f9 34 case 129: Log ("Echo Reply" ); break;
andrewboyson 57:e0fb648acf48 35 case 133: Log ("Router solicit" ); break;
andrewboyson 57:e0fb648acf48 36 case 134: Log ("Router advertisement" ); break;
andrewboyson 57:e0fb648acf48 37 case 135: Log ("Neighbour solicit" ); break;
andrewboyson 57:e0fb648acf48 38 case 136: Log ("Neighbour advertisement" ); break;
andrewboyson 57:e0fb648acf48 39 case 137: Log ("Redirect" ); break;
andrewboyson 57:e0fb648acf48 40 default: LogF("Unknown type %u", type ); break;
andrewboyson 43:bc028d5a6424 41 }
andrewboyson 43:bc028d5a6424 42 }
andrewboyson 43:bc028d5a6424 43 static uint16_t calculateChecksum(char* pSrcIp, char* pDstIp, int size, void* pPacket)
andrewboyson 43:bc028d5a6424 44 {
andrewboyson 43:bc028d5a6424 45 __packed struct pseudo
andrewboyson 43:bc028d5a6424 46 {
andrewboyson 43:bc028d5a6424 47 char src[16];
andrewboyson 43:bc028d5a6424 48 char dst[16];
andrewboyson 43:bc028d5a6424 49 uint32_t len;
andrewboyson 43:bc028d5a6424 50 uint8_t zer[3];
andrewboyson 43:bc028d5a6424 51 uint8_t pro;
andrewboyson 43:bc028d5a6424 52 } pseudo;
andrewboyson 43:bc028d5a6424 53
andrewboyson 49:1a6336f2b3f9 54 Ip6AddressCopy(pseudo.src, pSrcIp);
andrewboyson 49:1a6336f2b3f9 55 Ip6AddressCopy(pseudo.dst, pDstIp);
andrewboyson 43:bc028d5a6424 56 pseudo.len = NetToHost32(size);
andrewboyson 43:bc028d5a6424 57 pseudo.zer[0] = 0;
andrewboyson 43:bc028d5a6424 58 pseudo.zer[1] = 0;
andrewboyson 43:bc028d5a6424 59 pseudo.zer[2] = 0;
andrewboyson 43:bc028d5a6424 60 pseudo.pro = ICMP6;
andrewboyson 43:bc028d5a6424 61
andrewboyson 43:bc028d5a6424 62 return NetCheckSumTwo(sizeof(pseudo), &pseudo, size, pPacket);
andrewboyson 43:bc028d5a6424 63 }
andrewboyson 43:bc028d5a6424 64 static void logHeader()
andrewboyson 43:bc028d5a6424 65 {
andrewboyson 43:bc028d5a6424 66 if (NetTraceVerbose)
andrewboyson 43:bc028d5a6424 67 {
andrewboyson 43:bc028d5a6424 68 Log ("ICMP6 header\r\n");
andrewboyson 47:73af5c0b0dc2 69 Log (" Type "); logType(type); Log("\r\n");
andrewboyson 43:bc028d5a6424 70 LogF(" Code %u\r\n", code);
andrewboyson 43:bc028d5a6424 71 LogF(" Checksum (hex) %04hX\r\n", checksum);
andrewboyson 43:bc028d5a6424 72 LogF(" Calculated %04hX\r\n", calculatedChecksum);
andrewboyson 43:bc028d5a6424 73 LogF(" Data length %d\r\n", dataLength);
andrewboyson 43:bc028d5a6424 74 }
andrewboyson 43:bc028d5a6424 75 else
andrewboyson 43:bc028d5a6424 76 {
andrewboyson 43:bc028d5a6424 77 Log ("ICMP6 header ");
andrewboyson 47:73af5c0b0dc2 78 logType(type);
andrewboyson 43:bc028d5a6424 79 Log("\r\n");
andrewboyson 43:bc028d5a6424 80 }
andrewboyson 43:bc028d5a6424 81 }
andrewboyson 43:bc028d5a6424 82 static void readHeader(char* pSrcIp, char* pDstIp, void* pPacket, int size)
andrewboyson 43:bc028d5a6424 83 {
andrewboyson 43:bc028d5a6424 84 struct header* pHeader = (header*)pPacket;
andrewboyson 43:bc028d5a6424 85 type = pHeader->type;
andrewboyson 43:bc028d5a6424 86 code = pHeader->code;
andrewboyson 43:bc028d5a6424 87 checksum = NetToHost16(pHeader->checksum);
andrewboyson 43:bc028d5a6424 88 calculatedChecksum = calculateChecksum(pSrcIp, pDstIp, size, pPacket);
andrewboyson 43:bc028d5a6424 89 pData = (char*)pPacket + HEADER_LENGTH;
andrewboyson 43:bc028d5a6424 90 dataLength = size - HEADER_LENGTH;
andrewboyson 43:bc028d5a6424 91 }
andrewboyson 43:bc028d5a6424 92 static void writeHeader(void* pPacket, int size, char* pSrcIp, char* pDstIp)
andrewboyson 43:bc028d5a6424 93 {
andrewboyson 43:bc028d5a6424 94 struct header* pHeader = (header*)pPacket;
andrewboyson 43:bc028d5a6424 95 pHeader->type = type;
andrewboyson 43:bc028d5a6424 96 pHeader->code = code;
andrewboyson 43:bc028d5a6424 97 pHeader->checksum = 0;
andrewboyson 47:73af5c0b0dc2 98 checksum = calculateChecksum(pSrcIp, pDstIp, size, pPacket);
andrewboyson 47:73af5c0b0dc2 99 pHeader->checksum = checksum;
andrewboyson 43:bc028d5a6424 100 calculatedChecksum = 0;
andrewboyson 43:bc028d5a6424 101 }
andrewboyson 43:bc028d5a6424 102 static void (*pTraceBack)(void);
andrewboyson 43:bc028d5a6424 103 static void trace()
andrewboyson 43:bc028d5a6424 104 {
andrewboyson 43:bc028d5a6424 105 pTraceBack();
andrewboyson 43:bc028d5a6424 106 logHeader();
andrewboyson 43:bc028d5a6424 107 }
andrewboyson 44:83ce5ace337b 108 int Icmp6HandleReceivedPacket(void (*traceback)(void), int scope, char* pSrcIp, char* pDstIp, int* pSize, void* pPacket)
andrewboyson 43:bc028d5a6424 109 {
andrewboyson 43:bc028d5a6424 110 pTraceBack = traceback;
andrewboyson 43:bc028d5a6424 111
andrewboyson 43:bc028d5a6424 112 readHeader(pSrcIp, pDstIp, pPacket, *pSize);
andrewboyson 43:bc028d5a6424 113
andrewboyson 43:bc028d5a6424 114 int action = DO_NOTHING;
andrewboyson 43:bc028d5a6424 115 switch (type)
andrewboyson 43:bc028d5a6424 116 {
andrewboyson 57:e0fb648acf48 117 case 1: //Destination unreacheable
andrewboyson 57:e0fb648acf48 118 action = Dest6HandleRequest(trace, &type, &code);
andrewboyson 57:e0fb648acf48 119 break;
andrewboyson 43:bc028d5a6424 120 case 128: //Echo request - Ping
andrewboyson 43:bc028d5a6424 121 action = Echo6HandleRequest(trace, &type, &code);
andrewboyson 43:bc028d5a6424 122 break;
andrewboyson 43:bc028d5a6424 123 case 133: //Router solicit
andrewboyson 43:bc028d5a6424 124 return DO_NOTHING; //We are not a router so quietly drop this
andrewboyson 43:bc028d5a6424 125 case 134: //Router advertisement
andrewboyson 43:bc028d5a6424 126 action = RaHandleReceivedAdvertisement(trace, pData, &dataLength);
andrewboyson 43:bc028d5a6424 127 break;
andrewboyson 43:bc028d5a6424 128 case 135: //Neighbour solicit
andrewboyson 43:bc028d5a6424 129 action = NsHandleReceivedSolicitation(trace, pData, &dataLength, &type, &code);
andrewboyson 43:bc028d5a6424 130 break;
andrewboyson 43:bc028d5a6424 131 case 136: //Neighbour advertisement
andrewboyson 43:bc028d5a6424 132 action = NsHandleReceivedAdvertisement(trace, pData, &dataLength);
andrewboyson 43:bc028d5a6424 133 break;
andrewboyson 43:bc028d5a6424 134 default:
andrewboyson 48:952dddb74b8b 135 LogTimeF("ICMP6 unknown packet type %d\r\n", type);
andrewboyson 43:bc028d5a6424 136 return DO_NOTHING;
andrewboyson 43:bc028d5a6424 137 }
andrewboyson 43:bc028d5a6424 138 if (!action) return DO_NOTHING;
andrewboyson 43:bc028d5a6424 139
andrewboyson 49:1a6336f2b3f9 140 Ip6AddressCopy(pDstIp, pSrcIp);
andrewboyson 49:1a6336f2b3f9 141 SlaacAddressFromScope(scope, pSrcIp);
andrewboyson 49:1a6336f2b3f9 142 Ip6AddressFromDest (ActionGetDestPart(action), pDstIp);
andrewboyson 43:bc028d5a6424 143
andrewboyson 43:bc028d5a6424 144 *pSize = HEADER_LENGTH + dataLength;
andrewboyson 43:bc028d5a6424 145
andrewboyson 43:bc028d5a6424 146 writeHeader(pPacket, *pSize, pSrcIp, pDstIp);
andrewboyson 43:bc028d5a6424 147
andrewboyson 43:bc028d5a6424 148 if (ActionGetTracePart(action)) logHeader();
andrewboyson 43:bc028d5a6424 149
andrewboyson 43:bc028d5a6424 150 return action;
andrewboyson 43:bc028d5a6424 151 }
andrewboyson 43:bc028d5a6424 152 int Icmp6PollForPacketToSend(void* pPacket, int* pSize, char* pSrcIp, char* pDstIp)
andrewboyson 43:bc028d5a6424 153 {
andrewboyson 43:bc028d5a6424 154 pData = (char*)pPacket + HEADER_LENGTH;
andrewboyson 43:bc028d5a6424 155 int action = DO_NOTHING;
andrewboyson 46:40d33e9037e4 156 if (!action) action = RsGetWaitingSolicitation(pData, &dataLength, &type, &code);
andrewboyson 43:bc028d5a6424 157 if (!action) action = NsGetWaitingSolicitation(pData, &dataLength, &type, &code);
andrewboyson 43:bc028d5a6424 158 if (!action) return DO_NOTHING;
andrewboyson 43:bc028d5a6424 159
andrewboyson 44:83ce5ace337b 160 int scope = SCOPE_LOCAL;
andrewboyson 49:1a6336f2b3f9 161 SlaacAddressFromScope(scope, pSrcIp);
andrewboyson 49:1a6336f2b3f9 162 Ip6AddressFromDest (ActionGetDestPart(action), pDstIp);
andrewboyson 43:bc028d5a6424 163
andrewboyson 43:bc028d5a6424 164 *pSize = HEADER_LENGTH + dataLength;
andrewboyson 43:bc028d5a6424 165
andrewboyson 43:bc028d5a6424 166 writeHeader(pPacket, *pSize, pSrcIp, pDstIp);
andrewboyson 43:bc028d5a6424 167
andrewboyson 43:bc028d5a6424 168 if (ActionGetTracePart(action)) logHeader();
andrewboyson 43:bc028d5a6424 169
andrewboyson 43:bc028d5a6424 170 return action;
andrewboyson 43:bc028d5a6424 171
andrewboyson 43:bc028d5a6424 172 }