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:
- 2017-05-05
- Revision:
- 14:e75a59c1123d
- Parent:
- 13:9cd54f7db57a
- Child:
- 15:6ca6778168b1
File content as of revision 14:e75a59c1123d:
#include "mbed.h" #include "log.h" #include "net.h" #include "icmp6.h" #include "udptcp6.h" #include "ar.h" #include "slaac.h" #include "eth.h" #include "ip.h" #include "ip6.h" #include "ndp.h" #include "io.h" #define DEBUG false 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; } 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, NdpDnsServer, 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; char Ip6Src[16]; char Ip6Dst[16]; static void* pData; static void readHeader(struct header * pHeader) { version = (pHeader->versionTrafficFlow >> 4) & 0xF; dataLength = NetToHost16(pHeader->dataLength); protocol = pHeader->protocol; hoplimit = pHeader->hoplimit; memcpy(Ip6Src, pHeader->src, 16); memcpy(Ip6Dst, 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, Ip6Dst, 16); memcpy(pHeader->src, Ip6Src, 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(Ip6Src, sizeof(text), text); LogF(" Source IP %s\r\n", text); Ip6AddressToString(Ip6Dst, 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 getIsSame(char* pA, char* pB) { return memcmp(pA, pB, 16) == 0; } 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 = getIsSame(Ip6Dst, SlaacLinkLocalIp); bool isMulticast = Ip6Dst[0] == 0xFF; bool isSolicited = getIsSolicited(Ip6Dst); bool isGroup = isSolicited && getIsSameGroup(Ip6Dst, SlaacLinkLocalIp); bool doIt = isMe || (isMulticast && !isSolicited) || isGroup; if (!doIt) { char text[100]; Ip6AddressToString(Ip6Dst, sizeof(text), text); LogTimeF("IP6 filtered out ip %s \r\n", text); return DO_NOTHING; } ArAdd6(pSrcMac, Ip6Src); if (DEBUG) logHeader("IP6 packet received"); int action = DO_NOTHING; switch (protocol) { case HOPOPT: action = DO_NOTHING; break; case ICMP6: action = Icmp6HandleReceivedPacket(Ip6Src, Ip6Dst, &dataLength, pData); break; case UDP: action = Udp6HandleReceivedPacket(Ip6Src, Ip6Dst, &dataLength, pData); break; case TCP: action = Tcp6HandleReceivedPacket(Ip6Src, Ip6Dst, &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, Ip6Src, Ip6Dst); protocol = ICMP6; } if (action == DO_NOTHING) { action = Udp6PollForPacketToSend(pData, &dataLength, Ip6Src, Ip6Dst); protocol = UDP; } if (!action) return DO_NOTHING; switch (action) { case UNICAST: case UNICAST_DNS: case UNICAST_DHCP: ArRev6(Ip6Dst, pDstMac); //Make the remote MAC from NP break; } if (DEBUG) logHeader("IP6 polled packet sent"); writeHeader((header*)pPacket); *pSize = HEADER_LENGTH + dataLength; return action; }