File content as of revision 52:fbc5a46b5e16:

#include    "mbed.h"
#include     "log.h"
#include     "net.h"
#include  "action.h"
#include   "icmp6.h"
#include "udptcp6.h"
#include     "ar6.h"
#include     "nr6.h"
#include   "slaac.h"
#include     "eth.h"
#include      "ip.h"
#include "ip6addr.h"
#include     "ndp.h"
#include      "io.h"
#include     "ntp.h"
#include     "mac.h"
#include    "http.h"

bool Ip6Trace = true;


#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;

static void readHeader(struct header * pHeader)
{
    version    =            (pHeader->versionTrafficFlow >> 4) & 0xF;
    dataLength = NetToHost16(pHeader->dataLength);
    protocol   =             pHeader->protocol;
    hoplimit   =             pHeader->hoplimit;
       Ip6AddressCopy(srcIp, pHeader->src);
       Ip6AddressCopy(dstIp, pHeader->dst);
    pData      = (char*)pHeader + HEADER_LENGTH;
}
static void writeHeader(struct header * pHeader)
{
                   pHeader->versionTrafficFlow  = version << 4;
                   pHeader->protocol            = protocol;
                   pHeader->hoplimit            = hoplimit;
    Ip6AddressCopy(pHeader->dst, dstIp);
    Ip6AddressCopy(pHeader->src, srcIp);
                   pHeader->dataLength          = NetToHost16(dataLength);
}

static void logHeader()
{
    if (NetTraceVerbose)
    {
        Log("IP6 header\r\n");
        LogF("  Version           %d\r\n", version);
        LogF("  Payload length    %d\r\n", dataLength);
        LogF("  Hop limit         %d\r\n", hoplimit);
        LogF("  Protocol          "); IpProtocolLog(protocol); Log("\r\n");
        Log ("  Source IP         "); Ip6AddressLog(srcIp);    Log("\r\n");
        Log ("  Destination IP    "); Ip6AddressLog(dstIp);    Log("\r\n");
    }
    else
    {
        Log("IP6   header ");
        IpProtocolLog(protocol);
        Log(" ");
        Ip6AddressLog(srcIp);
        Log(" >>> ");
        Ip6AddressLog(dstIp);
        Log("\r\n");
    }
}

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;
}
static void (*pTraceBack)(void);
static void trace()
{
    pTraceBack();
    logHeader();
}
int Ip6HandleReceivedPacket(void (*traceback)(void), char* pSrcMac, void* pPacket, int* pSize, char* pDstMac)
{
    pTraceBack = traceback;
    
    struct header * pHeader = (header*)pPacket;
    readHeader(pHeader);
    
    int  scope       = SlaacScope(dstIp);
    bool isMulticast = dstIp[0] == 0xFF;
    bool isSolicited = getIsSolicited(dstIp);
    bool isGroup     = getIsSameGroup(dstIp, SlaacLinkLocalIp);
    
    bool doIt = scope || (isMulticast && !isSolicited) || (isGroup && isSolicited);
    
    if (!doIt)
    {
        if (Ip6Trace)
        {
            LogTime("IP6 filtered out ip ");
            Ip6AddressLog(dstIp);
            LogF(" from ");
            Ip6AddressLog(srcIp);
            Log("\r\n");
        }
        return DO_NOTHING;
    }
    
    Ar6AddIpRecord(trace, pSrcMac, srcIp);
    Nr6MakeRequestForNameFromIp(srcIp);

    int action = DO_NOTHING;
    switch (protocol)
    {
        case HOPOPT: action = DO_NOTHING;                                                                break;
        case ICMP6:  action = Icmp6HandleReceivedPacket(trace, scope, srcIp, dstIp, &dataLength, pData); break;
        case UDP:    action =  Udp6HandleReceivedPacket(trace, scope, srcIp, dstIp, &dataLength, pData); break;
        case TCP:    action =  Tcp6HandleReceivedPacket(trace, scope, srcIp, dstIp, &dataLength, pData); break;        
        default:
            LogTimeF("IP6 protocol %d unhandled\r\n", protocol);
            return DO_NOTHING;
    }
    if (!action) return DO_NOTHING;
    
    if (NdpIpNeedsToBeRouted(dstIp)) MacCopy(pDstMac, NdpRouterMac); //Send to the router MAC
    else                             MacCopy(pDstMac,      pSrcMac); //Send back to the source

    writeHeader(pHeader);
      
    *pSize = HEADER_LENGTH + dataLength;
    
    if (ActionGetTracePart(action)) logHeader();

    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)
    {
        action = Icmp6PollForPacketToSend(pData, &dataLength, srcIp, dstIp);
        protocol = ICMP6;
    }
    
    if (!action)
    {
        action = Udp6PollForPacketToSend(pData, &dataLength, srcIp, dstIp);
        protocol = UDP;
    }
    if (!action) return DO_NOTHING;
    
    int dest = ActionGetDestPart(action);
    switch (dest)
    {
        case UNICAST:
        case UNICAST_DNS:
        case UNICAST_DHCP:
        case UNICAST_NTP:
            if (NdpIpNeedsToBeRouted(dstIp)) MacCopy   (pDstMac, NdpRouterMac); //Send to the router MAC
            else                             Ar6IpToMac(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 destination %d\r\n", dest);
            break;
    }

    writeHeader((header*)pPacket);

    *pSize = HEADER_LENGTH + dataLength;
    
    if (ActionGetTracePart(action)) logHeader();

    return action;
}