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
ip6/icmp/icmp6.cpp
- Committer:
- andrewboyson
- Date:
- 2017-12-14
- Revision:
- 59:e0e556c8bd46
- Parent:
- 57:e0fb648acf48
File content as of revision 59:e0e556c8bd46:
#include "mbed.h" #include "log.h" #include "net.h" #include "action.h" #include "ns.h" #include "ra.h" #include "rs.h" #include "ip.h" #include "ip6addr.h" #include "slaac.h" #include "echo6.h" #include "dest6.h" __packed struct header { uint8_t type; uint8_t code; uint16_t checksum; }; static uint8_t type; static uint8_t code; static uint16_t checksum; static uint16_t calculatedChecksum; static void logType(uint8_t type) { switch (type) { case 1: Log ("Destination unreacheable" ); break; case 128: Log ("Echo Request" ); break; case 129: Log ("Echo Reply" ); break; case 133: Log ("Router solicit" ); break; case 134: Log ("Router advertisement" ); break; case 135: Log ("Neighbour solicit" ); break; case 136: Log ("Neighbour advertisement" ); break; case 137: Log ("Redirect" ); break; default: LogF("Unknown type %u", type ); break; } } static uint16_t calculateChecksum(char* pSrcIp, char* pDstIp, int size, void* pPacket) { __packed struct pseudo { char src[16]; char dst[16]; uint32_t len; uint8_t zer[3]; uint8_t pro; } pseudo; Ip6AddressCopy(pseudo.src, pSrcIp); Ip6AddressCopy(pseudo.dst, pDstIp); pseudo.len = NetToHost32(size); pseudo.zer[0] = 0; pseudo.zer[1] = 0; pseudo.zer[2] = 0; pseudo.pro = ICMP6; return NetCheckSumTwo(sizeof(pseudo), &pseudo, size, pPacket); } static void logHeader() { if (NetTraceVerbose) { Log ("ICMP6 header\r\n"); Log (" Type "); logType(type); Log("\r\n"); LogF(" Code %u\r\n", code); LogF(" Checksum (hex) %04hX\r\n", checksum); LogF(" Calculated %04hX\r\n", calculatedChecksum); } else { Log ("ICMP6 header "); logType(type); Log("\r\n"); } } static void readHeader(char* pSrcIp, char* pDstIp, void* pPacket, int size) { struct header* pHeader = (header*)pPacket; type = pHeader->type; code = pHeader->code; checksum = NetToHost16(pHeader->checksum); calculatedChecksum = calculateChecksum(pSrcIp, pDstIp, size, pPacket); } static void writeHeader(void* pPacket, int size, char* pSrcIp, char* pDstIp) { struct header* pHeader = (header*)pPacket; pHeader->type = type; pHeader->code = code; pHeader->checksum = 0; checksum = calculateChecksum(pSrcIp, pDstIp, size, pPacket); pHeader->checksum = checksum; calculatedChecksum = 0; } static void (*pTraceBack)(void); static void trace() { pTraceBack(); logHeader(); } int Icmp6HandleReceivedPacket(void (*traceback)(void), int scope, void* pPacketRx, int sizeRx, void* pPacketTx, int* pSizeTx, char* pSrcIp, char* pDstIp) { pTraceBack = traceback; readHeader(pSrcIp, pDstIp, pPacketRx, sizeRx); int dataLengthRx = sizeRx - sizeof(header); int dataLengthTx = *pSizeTx - sizeof(header); char* pPayloadRx = (char*)pPacketRx + sizeof(header); char* pPayloadTx = (char*)pPacketTx + sizeof(header); int action = DO_NOTHING; switch (type) { case 1: //Destination unreacheable action = Dest6HandleRequest(trace, &type, &code); break; case 128: //Echo request - Ping action = Echo6HandleRequest(trace, &type, &code, pPayloadRx, dataLengthRx, pPayloadTx, &dataLengthTx); break; case 133: //Router solicit return DO_NOTHING; //We are not a router so quietly drop this case 134: //Router advertisement action = RaHandleReceivedAdvertisement(trace, pPayloadRx, &dataLengthRx); break; case 135: //Neighbour solicit action = NsHandleReceivedSolicitation(trace, &type, &code, pPayloadRx, dataLengthRx, pPayloadTx, &dataLengthTx); break; case 136: //Neighbour advertisement action = NsHandleReceivedAdvertisement(trace, pPayloadRx, &dataLengthRx); break; default: LogTimeF("ICMP6 unknown packet type %d\r\n", type); return DO_NOTHING; } if (!action) return DO_NOTHING; Ip6AddressCopy(pDstIp, pSrcIp); SlaacAddressFromScope(scope, pSrcIp); Ip6AddressFromDest (ActionGetDestPart(action), pDstIp); *pSizeTx = sizeof(header) + dataLengthTx; writeHeader(pPacketTx, *pSizeTx, pSrcIp, pDstIp); if (ActionGetTracePart(action)) logHeader(); return action; } int Icmp6PollForPacketToSend(void* pPacket, int* pSize, char* pSrcIp, char* pDstIp) { char* pData = (char*)pPacket + sizeof(header); int dataLength = *pSize - sizeof(header); int action = DO_NOTHING; if (!action) action = RsGetWaitingSolicitation(pData, &dataLength, &type, &code); if (!action) action = NsGetWaitingSolicitation(pData, &dataLength, &type, &code); if (!action) return DO_NOTHING; int scope = SCOPE_LOCAL; SlaacAddressFromScope(scope, pSrcIp); Ip6AddressFromDest (ActionGetDestPart(action), pDstIp); *pSize = sizeof(header) + dataLength; writeHeader(pPacket, *pSize, pSrcIp, pDstIp); if (ActionGetTracePart(action)) logHeader(); return action; }