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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;
	dstRule->old_count = srcRule->old_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, flags=0x%x", 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 != MV_FP_NULL_BINDING) || (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)) {
			return pNatRule->new_count;
		}
		pNatRule = pNatRule->next;
	}
	return 0;
}