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/* includes */
#include "mvTypes.h"
#include "mvOs.h"
#include "mvStack.h"
#include "mvDebug.h"
#include "eth/nfp/mvNfp.h"
#include "eth/mvEth.h"


struct natRuleHashBucket    *natRuleDb;
MV_U32                      natRuleDbSize;

MV_U32                      natRuleUpdateCount = 0;
MV_U32                      natRuleSetCount = 0;
MV_U32                      natRuleDeleteCount = 0;
MV_U32                      natHashMaxDepth = 0;

/* Initialize NFP NAT Rule Database (SNAT + DNAT table) */
MV_STATUS   mvFpNatDbInit(MV_U32 dbSize)
{
	natRuleDb = (struct natRuleHashBucket *)mvOsMalloc(sizeof(struct natRuleHashBucket)*dbSize);
	if (natRuleDb == NULL) {
		mvOsPrintf("NFP NAT Rule DB: Not Enough Memory\n");
		return MV_NO_RESOURCE;
	}
	natRuleDbSize = dbSize;
	memset(natRuleDb, 0, sizeof(struct natRuleHashBucket)*natRuleDbSize);

	natRuleSetCount = natRuleDeleteCount = natRuleUpdateCount = 0;

	mvOsPrintf("mvFpNatDb (%p): %d entries, %d bytes\n", 
                natRuleDb, natRuleDbSize, sizeof(struct natRuleHashBucket)*natRuleDbSize);

	return MV_OK;
}

/* Clear NFP NAT Rule Database (SNAT + DNAT table) */
MV_STATUS   mvFpNatDbClear(void)
{
	MV_U32 i = 0;
	MV_FP_NAT_RULE *currRule;
	MV_FP_NAT_RULE *tmpRule;

	if (natRuleDb == NULL) 
		return MV_NOT_INITIALIZED;

	for (i = 0; i < natRuleDbSize; i++) {
		currRule = natRuleDb[i].natRuleChain;
		while (currRule != NULL) {
			tmpRule = currRule;
			currRule = currRule->next;
			mvOsFree(tmpRule);
		}
        	natRuleDb[i].natRuleChain = NULL;
	}
	return MV_OK;
}

/* Free NAT Database memory */
void mvFpNatDbDestroy(void)
{
	if (natRuleDb != NULL)
		mvOsFree(natRuleDb);
}

static void mvFpNatRuleUpdate(MV_FP_NAT_RULE *dstRule, const MV_FP_NAT_RULE *srcRule)
{
    dstRule->flags   = srcRule->flags;
    dstRule->newIp   = srcRule->newIp;
    dstRule->newPort = srcRule->newPort;
    dstRule->new_count = srcRule->new_count;
}

/* Set a NAT rule: create a new rule or update an existing rule in the SNAT + DNAT table */
MV_STATUS mvFpNatRuleSet(MV_FP_NAT_RULE *pSetRule)
{
    int             depth = 0;
    MV_U32          hash, hash_tr;
    MV_FP_NAT_RULE  *pNatRule, *pNewRule;

    hash = mv_jhash_3words(pSetRule->dstIp, pSetRule->srcIp, 
                            (MV_U32)((pSetRule->dstPort << 16) | pSetRule->srcPort), 
                            (MV_U32)((fp_ip_jhash_iv << 8) | pSetRule->proto));
    hash_tr = hash & (natRuleDbSize - 1);
    pNatRule = natRuleDb[hash_tr].natRuleChain;

    while(pNatRule)
    {
        /* look for a matching rule */
        if( (pNatRule->dstIp == pSetRule->dstIp) && 
            (pNatRule->srcIp == pSetRule->srcIp) &&
            (pNatRule->proto == pSetRule->proto) &&
            (pNatRule->dstPort  == pSetRule->dstPort) &&
            (pNatRule->srcPort  == pSetRule->srcPort) )
        {
            /* update rule */
            mvFpNatRuleUpdate(pNatRule, pSetRule);
            natRuleUpdateCount++;

#ifdef MV_FP_DEBUG
            mvOsPrintf("UpdNAT_%03u: DIP=0x%08x, SIP=0x%08x, proto=%d, DPort=%d, SPort=%d, hash=0x%04x, flags=0x%02x\n",
                        natRuleUpdateCount, pNatRule->dstIp, pNatRule->srcIp, pNatRule->proto, 
                        MV_16BIT_BE(pNatRule->dstPort), MV_16BIT_BE(pNatRule->srcPort), hash_tr, pNatRule->flags);
#endif
            return MV_OK;
        }
        pNatRule = pNatRule->next;
    }
    /* Allocate new entry */
    pNewRule = mvOsMalloc(sizeof(MV_FP_NAT_RULE));
    if(pNewRule == NULL)
    {
        mvOsPrintf("mvFpNatRuleSet: Can't allocate new rule\n");
        return MV_FAIL;
    }

    memcpy(pNewRule, pSetRule, sizeof(*pNewRule));
    pNewRule->next = NULL;

    if(natRuleDb[hash_tr].natRuleChain == NULL)
    {
        natRuleDb[hash_tr].natRuleChain = pNewRule;
    }
    else 
    {
	    pNatRule = natRuleDb[hash_tr].natRuleChain;
        
        while (pNatRule->next != NULL)
        {
            depth++;
	        pNatRule = pNatRule->next;	    
        }

	    pNatRule->next = pNewRule;
    }
    if(depth > natHashMaxDepth)
        natHashMaxDepth = depth;

    natRuleSetCount++;

#ifdef MV_FP_DEBUG
    mvOsPrintf("SetNAT_%03u: DIP=0x%08x, SIP=0x%08x, proto=%d, DPort=%d, SPort=%d, hash=0x%04x, flags=0x%02x\n",
                natRuleSetCount, pNewRule->dstIp, pNewRule->srcIp, pNewRule->proto, 
                MV_16BIT_BE(pNewRule->dstPort), MV_16BIT_BE(pNewRule->srcPort), hash_tr, pNewRule->flags);
#endif
    return MV_OK;
}

/* Delete a specified NAT rule from the SNAT + DNAT table */
MV_STATUS mvFpNatRuleDelete(MV_FP_NAT_RULE *natRule)
{
    MV_U32      hash, hash_tr;
    MV_FP_NAT_RULE  *currRule, *prevRule;

    natRuleDeleteCount++;

    hash = mv_jhash_3words(natRule->dstIp, natRule->srcIp, 
                            (MV_U32)((natRule->dstPort << 16) | natRule->srcPort), 
                            (MV_U32)((fp_ip_jhash_iv << 8) | natRule->proto));
    hash_tr = hash & (natRuleDbSize - 1);

    prevRule = NULL;
    for (currRule = natRuleDb[hash_tr].natRuleChain; 
	 currRule != NULL; 
	 prevRule = currRule, currRule = currRule->next) 
    {
	    if (currRule->srcIp == natRule->srcIp && 
		currRule->dstIp == natRule->dstIp && 
		currRule->srcPort == natRule->srcPort && 
		currRule->dstPort == natRule->dstPort && 
		currRule->proto == natRule->proto ) 
	    {		
		    if (prevRule == NULL)
			    natRuleDb[hash_tr].natRuleChain = currRule->next;
		    else
			    prevRule->next = currRule->next;

#ifdef MV_FP_DEBUG
		    mvOsPrintf("DelNAT_%03u: DIP=0x%08x, SIP=0x%08x, proto=%d, DPort=%d, SPort=%d, hash=0x%04x\n",
              	        natRuleDeleteCount, currRule->dstIp, currRule->srcIp, currRule->proto, 
			            MV_16BIT_BE(currRule->dstPort), MV_16BIT_BE(currRule->srcPort), hash_tr);
#endif
		mvOsFree(currRule);	
		return MV_OK;
	    }
    }
    return MV_NOT_FOUND;
}

int    mvFpNatPktUpdate(MV_IP_HEADER* pIpHdr, MV_FP_NAT_RULE* pDnatRule, MV_FP_NAT_RULE* pSnatRule)
{
    MV_UDP_HEADER       *pUdpHdr;
    MV_TCP_HEADER       *pTcpHdr;
    MV_ICMP_ECHO_HEADER *pIcmpHdr;
    int                 hdr_size = 0;
    MV_U16              *pDstPort=NULL, *pSrcPort=NULL;

    switch(pIpHdr->protocol)
    {
        case MV_IP_PROTO_TCP:
            pTcpHdr = (MV_TCP_HEADER*)((unsigned)pIpHdr + sizeof(MV_IP_HEADER));
            pDstPort = &pTcpHdr->dest;
            pSrcPort = &pTcpHdr->source;
            hdr_size = sizeof(MV_TCP_HEADER);
            break;

        case MV_IP_PROTO_UDP:
            pUdpHdr = (MV_UDP_HEADER*)((unsigned)pIpHdr + sizeof(MV_IP_HEADER));
            pDstPort = &pUdpHdr->dest;
            pSrcPort = &pUdpHdr->source;
            hdr_size = sizeof(MV_UDP_HEADER);
            break;

        case MV_IP_PROTO_ICMP:
            pIcmpHdr = (MV_ICMP_ECHO_HEADER*)((unsigned)pIpHdr + sizeof(MV_IP_HEADER));
            if( (pIcmpHdr->type == MV_ICMP_ECHO) || (pIcmpHdr->type == MV_ICMP_ECHOREPLY) )
            {
                pDstPort = &pIcmpHdr->id;
                pSrcPort = &pIcmpHdr->id;
                hdr_size = sizeof(MV_ICMP_ECHO_HEADER);
            }
            else
            {
                mvOsPrintf("Wrong ICMP type: 0x%x\n", pIcmpHdr->type & 0xFF);
            }
            break;

	    case MV_IP_PROTO_ZERO_HOP:
	        /* Do nothing - only IP addresses are updated for this protocol */
	        break;

        default:
            mvOsPrintf("Unexpected IP protocol: 0x%x\n", 
                        pIpHdr->protocol);
    }
    if(pDnatRule != NULL)
    {
        if(pDnatRule->flags & MV_FP_DIP_CMD_MAP)
            pIpHdr->dstIP = pDnatRule->newIp;
        if( (pDnatRule->flags & MV_FP_DPORT_CMD_MAP) && 
            (pDstPort != NULL) )
            *pDstPort = pDnatRule->newPort;
    }

    if(pSnatRule != NULL)
    {
        if(pSnatRule->flags & MV_FP_SIP_CMD_MAP)
            pIpHdr->srcIP = pSnatRule->newIp;

        if( (pSnatRule->flags & MV_FP_SPORT_CMD_MAP) && 
            (pSrcPort != NULL) )
            *pSrcPort = pSnatRule->newPort;
    }
    return hdr_size;
}

/* Print a NFP NAT Rule */
void    mvFpNatRulePrint(const MV_FP_NAT_RULE *rule)
{
	/* Note: some of the fields in the NAT rule may contain invalid values */
    mvOsPrintf("Original packet: ");
    mvOsPrintf("SIP=");
    mvDebugPrintIpAddr(MV_32BIT_BE(rule->srcIp)), 
    mvOsPrintf(", DIP=");
    mvDebugPrintIpAddr(MV_32BIT_BE(rule->dstIp)), 
    mvOsPrintf(", SPort=%d", MV_16BIT_BE(rule->srcPort));
    mvOsPrintf(", DPort=%d", MV_16BIT_BE(rule->dstPort)); 
    mvOsPrintf("\nNAT Info: ");
    mvOsPrintf("count=%u, new_count=%u, flags=0x%x", rule->count, rule->new_count, rule->flags);
    mvOsPrintf(", newIP=");
    mvDebugPrintIpAddr(MV_32BIT_BE(rule->newIp)); 
    mvOsPrintf(", newPort=%d", MV_16BIT_BE(rule->newPort));
    mvOsPrintf("\n");
}

/* Print NFP NAT Rule Database (SNAT + DNAT table) */
MV_STATUS   mvFpNatDbPrint(void)
{
    MV_U32 count, i = 0;
    MV_FP_NAT_RULE *currRule;
	
    mvOsPrintf("\nPrinting NFP NAT Rule Database: \n");
    count = 0;
    for (i=0; i<natRuleDbSize; i++) 
    {
	currRule = natRuleDb[i].natRuleChain;

        if (currRule != NULL)
    	    mvOsPrintf("\n%03u: NAT DB hash=0x%x\n", count, i);

       	while (currRule != NULL) 
        {
	    if( (currRule->flags != 0) || (currRule->new_count > 0) )
            {
                mvOsPrintf("%03u: Rule=%p, Next=%p\n", count, currRule, currRule->next);
	        mvFpNatRulePrint(currRule);
            }
	    currRule = currRule->next;
            count++;
       	}
    }
    return MV_OK;
}

/* Get the count value for a NAT rule */
MV_U32 mvFpNatCountGet(MV_U32 srcIp, MV_U32 dstIp, MV_U16 srcPort, MV_U16 dstPort, MV_U8 proto)
{
    MV_U32      hash, hash_tr;
    MV_FP_NAT_RULE  *pNatRule;

    hash = mv_jhash_3words(dstIp, srcIp, (MV_U32)((dstPort << 16) | srcPort), 
                            (MV_U32)((fp_ip_jhash_iv << 8) | proto));
    hash_tr = hash & (natRuleDbSize - 1);
    pNatRule = natRuleDb[hash_tr].natRuleChain;

    while(pNatRule)
    {
        /* look for a matching rule */
        if( (pNatRule->dstIp == dstIp) && 
            (pNatRule->srcIp == srcIp) &&
            (pNatRule->proto == proto) &&
            (pNatRule->dstPort  == dstPort) &&
            (pNatRule->srcPort  == srcPort) )
        {
	    int count = pNatRule->new_count;
	    pNatRule->count += count;
	    pNatRule->new_count = 0;
	    return count;
	}
	pNatRule = pNatRule->next;
    }
    return 0;
}