IPSTACK * IPSRefresh(IPSTACK * pIpStack, const LLADP * pLLAdp, IPSTATUS * pStatus)
{
AssignStatusSafely(pStatus, ipsSuccess);
if(pIpStack == NULL)
{
pIpStack = IPSGetIpStackFromAdaptor(pLLAdp, ippnTCP, pStatus);
}
else
{
pIpStack = IPSSwapSrcAndDest(pIpStack);
}
if(pIpStack != NULL)
{
// the payload may have a pointer in it that we are going to clear
// that pointer may or may not be from the heap; but if it is not from
// the heap, the pointer will be outside of the heap ranage and be ignored
// by the heap manager with no damage.
if(pIpStack->fFreePayloadToAdp)
{
RRHPFree(pIpStack->pLLAdp->pNwAdp->hAdpHeap, pIpStack->pPayload);
}
pIpStack->cbPayload = 0;
pIpStack->pPayload = NULL;
switch(pIpStack->protocol)
{
case ippnUDP:
pIpStack->pUDPHdr->cbHdrData = sizeof(UDPHDR);
pIpStack->pUDPHdr->checksum = 0;
break;
case ippnTCP:
pIpStack->pTCPHdr->u16Flags = 0;
pIpStack->pTCPHdr->dataOffset = sizeof(TCPHDR)/sizeof(uint32_t);
pIpStack->pTCPHdr->urgentPtr = 0;
pIpStack->pTCPHdr->checksum = 0;
break;
default:
break;
}
}
return(pIpStack);
}
void ICMPv4Process(IPSTACK * pIpStack)
{
IPv4 IpSrc;
switch(pIpStack->pICMPHdr->icmpType)
{
case icmpTypeEcho:
// We are going to resuse this inboud packet as the outbound one
// RFC 792 says swap source and destination change type code
// set type to reply
pIpStack->pICMPHdr->icmpType = icmpTypeEchoReply;
// swap source and dest
IPSSwapSrcAndDest(pIpStack);
// now send it
// Don't care about errors
ILSend(pIpStack, NULL);
break;
case icmpTypeEchoReply:
case icmpTypeDestinationUnreachable:
case icmpTypeSourceQuench:
case icmpTypeRedirect:
case icmpTypeTimeExceeded:
case icmpTypeParameterProblem:
case icmpTypeTimestamp:
case icmpTypeTimestampReply:
case icmpTypeInformationRequest:
case icmpTypeInformationReply:
default:
return;
}
}
