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/ip6.cpp
- Committer:
- andrewboyson
- Date:
- 2017-09-22
- Revision:
- 35:93c39d260a83
- Parent:
- 34:e3a7bff69bfc
- Child:
- 36:900e24b27bfb
File content as of revision 35:93c39d260a83:
#include "mbed.h" #include "log.h" #include "net.h" #include "icmp6.h" #include "udptcp6.h" #include "ar.h" #include "nr.h" #include "slaac.h" #include "eth.h" #include "ip.h" #include "ip6.h" #include "ra.h" #include "io.h" #include "ntp.h" #define DEBUG false #define SHOW_FILTERED true static void addHexNibble(bool* pAdded, int number, int index, char** pp) { int nibble = number; if (index) nibble >>= 4; nibble &= 0xF; if (nibble || *pAdded) { **pp = nibble < 10 ? nibble + '0' : nibble - 10 + 'a'; *pp += 1; *pAdded = true; } } int Ip6AddressToString(char* pIp, int size, char* pText) { char* pIpE = pIp + 16; char* p = pText; while (true) { bool added = false; if (*pIp || *(pIp + 1)) { if (p > pText + size - 2) break; addHexNibble(&added, *(pIp + 0), 1, &p); if (p > pText + size - 2) break; addHexNibble(&added, *(pIp + 0), 0, &p); if (p > pText + size - 2) break; addHexNibble(&added, *(pIp + 1), 1, &p); if (p > pText + size - 2) break; addHexNibble(&added, *(pIp + 1), 0, &p); } pIp += 2; if (pIp >= pIpE) break; if (p > pText + size - 2) break; *p++ = ':'; } *p = 0; return p - pText; } bool Ip6IsSame(char* ipA, char* ipB) { return memcmp(ipA, ipB, 16) == 0; } bool Ip6IsEmpty(char* ip) { return !*ip; //Just check for the first byte being non zero } void Ip6CopyToFrom(char* ipTo, char* ipFrom) { memcpy(ipTo, ipFrom, 16); } char Ip6AllNodes [] = {0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; char Ip6AllRouters[] = {0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}; char Ip6Mdns [] = {0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfb}; char Ip6Llmnr [] = {0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x03}; void Ip6DestIpFromAction(int action, char* pDstIp) { switch (action) { case UNICAST: break; case UNICAST_DNS: memcpy(pDstIp, RaDnsServer, 16); break; case UNICAST_NTP: memcpy(pDstIp, NtpServerIp6, 16); break; case MULTICAST_NODE: memcpy(pDstIp, Ip6AllNodes, 16); break; case MULTICAST_ROUTER: memcpy(pDstIp, Ip6AllRouters, 16); break; case MULTICAST_MDNS: memcpy(pDstIp, Ip6Mdns, 16); break; case MULTICAST_LLMNR: memcpy(pDstIp, Ip6Llmnr, 16); break; default: LogTimeF("Ip6 DestIpFromAction unknown action %d\r\n", action); break; } } #define HEADER_LENGTH 40 __packed struct header { uint32_t versionTrafficFlow; uint16_t dataLength; uint8_t protocol; uint8_t hoplimit; char src[16]; char dst[16]; }; static uint8_t version; static int dataLength; static uint8_t protocol; static uint8_t hoplimit; static char srcIp[16]; static char dstIp[16]; static void* pData; void Ip6LogHeaderSrc() { char text[64]; Ip6AddressToString(srcIp, sizeof(text), text); Log(text); } void Ip6LogHeaderDst() { char text[64]; Ip6AddressToString(dstIp, sizeof(text), text); Log(text); } static void readHeader(struct header * pHeader) { version = (pHeader->versionTrafficFlow >> 4) & 0xF; dataLength = NetToHost16(pHeader->dataLength); protocol = pHeader->protocol; hoplimit = pHeader->hoplimit; memcpy(srcIp, pHeader->src, 16); memcpy(dstIp, pHeader->dst, 16); pData = (char*)pHeader + HEADER_LENGTH; } static void writeHeader(struct header * pHeader) { pHeader->versionTrafficFlow = version << 4; pHeader->protocol = protocol; pHeader->hoplimit = 255; memcpy(pHeader->dst, dstIp, 16); memcpy(pHeader->src, srcIp, 16); pHeader->dataLength = NetToHost16(dataLength); } static void logHeader(char* title) { char text[100]; LogTimeF("%s\r\n", title); LogF(" Version %d\r\n", version); LogF(" Payload length %d\r\n", dataLength); LogF(" Hop limit %d\r\n", hoplimit); IpProtocolToString(protocol, sizeof(text), text); LogF(" Protocol %s\r\n", text); Ip6AddressToString(srcIp, sizeof(text), text); LogF(" Source IP %s\r\n", text); Ip6AddressToString(dstIp, sizeof(text), text); LogF(" Destination IP %s\r\n", text); } static bool getIsSolicited(char* p) { if (*p++ != 0xff) return false; if (*p++ != 0x02) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x00) return false; if (*p++ != 0x01) return false; if (*p++ != 0xff) return false; return true; } static bool getIsSameGroup(char* pA, char* pB) { pA += 13; pB += 13; if (*pA++ != *pB++) return false; if (*pA++ != *pB++) return false; return *pA == *pB; } int Ip6HandleReceivedPacket(char* pSrcMac, void* pPacket, int* pSize, char* pDstMac) { struct header * pHeader = (header*)pPacket; readHeader(pHeader); bool isMe = SlaacIsMe(dstIp); bool isMulticast = dstIp[0] == 0xFF; bool isSolicited = getIsSolicited(dstIp); bool isGroup = getIsSameGroup(dstIp, SlaacLinkLocalIp); bool doIt = isMe || (isMulticast && !isSolicited) || (isGroup && isSolicited); if (!doIt) { if (DEBUG || SHOW_FILTERED) { char text[100]; Ip6AddressToString(dstIp, sizeof(text), text); LogTimeF("IP6 filtered out ip %s ", text); Ip6AddressToString(srcIp, sizeof(text), text); LogF("from %s \r\n", text); } return DO_NOTHING; } ArAddIp6Record(pSrcMac, srcIp); NrMakeRequestForNameFromIp6(srcIp); if (DEBUG) logHeader("IP6 packet received"); int action = DO_NOTHING; switch (protocol) { case HOPOPT: action = DO_NOTHING; break; case ICMP6: action = Icmp6HandleReceivedPacket(srcIp, dstIp, &dataLength, pData); break; case UDP: action = Udp6HandleReceivedPacket(srcIp, dstIp, &dataLength, pData); break; case TCP: action = Tcp6HandleReceivedPacket(srcIp, dstIp, &dataLength, pData); break; default: logHeader("IP6 packet unhandled"); return DO_NOTHING; } if (!action) return DO_NOTHING; memcpy(pDstMac, pSrcMac, 6); if (DEBUG) logHeader("IP6 packet replied to"); writeHeader(pHeader); *pSize = HEADER_LENGTH + dataLength; return action; } int Ip6PollForPacketToSend(void* pPacket, int* pSize, char* pDstMac) { pData = (char*)pPacket + HEADER_LENGTH; dataLength = 0; version = 6; hoplimit = 255; int action = DO_NOTHING; if (action == DO_NOTHING) { action = Icmp6PollForPacketToSend(pData, &dataLength, srcIp, dstIp); protocol = ICMP6; } if (action == DO_NOTHING) { action = Udp6PollForPacketToSend(pData, &dataLength, srcIp, dstIp); protocol = UDP; } if (!action) return DO_NOTHING; switch (action) { case UNICAST: case UNICAST_DNS: case UNICAST_DHCP: case UNICAST_NTP: ArIpToMac6(dstIp, pDstMac); //Make the remote MAC from NP break; case MULTICAST_NODE: case MULTICAST_ROUTER: case MULTICAST_MDNS: case MULTICAST_LLMNR: case SOLICITED_NODE: break; default: LogTimeF("Ip6PollForPacketToSend - undefined action %d\r\n", action); break; } if (DEBUG) logHeader("IP6 polled packet sent"); writeHeader((header*)pPacket); *pSize = HEADER_LENGTH + dataLength; return action; }