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/*******************************************************************************
* mvNfpSec.c - Marvell Network Fast Processing with IPSec(Routing only)
*
* DESCRIPTION:
*       
*       Supported Features:
*       - OS independent. 
*
*******************************************************************************/

/* includes */
#include "mvOs.h"
#include "mvDebug.h"
#include "eth/nfp/mvNfp.h"
#include "eth/mvEth.h"
#include "eth/nfp/mvNfpSec.h"
#include "cesa/mvCesa.h"

/* IPSec SA & SPD DBs */
MV_NFP_SEC_SPD_RULE* spdInDb;
MV_NFP_SEC_SPD_RULE* spdOutDb;
MV_NFP_SEC_SA_ENTRY* saInDb;
MV_NFP_SEC_SA_ENTRY* saOutDb;

static MV_CESA_COMMAND cesaCmdArray[MV_NFP_SEC_Q_SIZE];
static MV_NFP_SEC_CESA_PRIV cesaPrivArray[MV_NFP_SEC_Q_SIZE + MV_NFP_SEC_REQ_Q_SIZE];
static int cesaCmdIndx = 0;
static int cesaPrivIndx = 0;

static MV_U32 spdInRuleCount;
static MV_U32 spdOutRuleCount;
static MV_U32 saInEntryCount;
static MV_U32 saOutEntryCount;
static MV_U32 secDbSize;

extern int cesaReqResources;

MV_STATUS mvNfpSecInit(MV_U32 dbSize)
{
	if(dbSize == 0)
		return MV_BAD_PARAM;

	spdInDb  = (struct _mv_nfp_sec_spd_rule*)mvOsMalloc(dbSize * (sizeof(struct _mv_nfp_sec_spd_rule)));
	spdOutDb = (struct _mv_nfp_sec_spd_rule*)mvOsMalloc(dbSize * (sizeof(struct _mv_nfp_sec_spd_rule)));
	saInDb   = (struct _mv_nfp_sec_sa_entry*)mvOsMalloc(dbSize * (sizeof(struct _mv_nfp_sec_sa_entry)));
	saOutDb  = (struct _mv_nfp_sec_sa_entry*)mvOsMalloc(dbSize * (sizeof(struct _mv_nfp_sec_sa_entry)));

	if((spdInDb == NULL) || (spdOutDb== NULL) || (saInDb == NULL) || (saOutDb == NULL)) {
		mvOsPrintf("NFP-IPSec Rules DB: Not Enough Memory\n");
	    		return MV_NO_RESOURCE;	
	}
	
	secDbSize = dbSize;
	spdInRuleCount = spdOutRuleCount = saInEntryCount = saOutEntryCount = 0;

	memset(spdInDb, 0, (dbSize * sizeof(struct _mv_nfp_sec_spd_rule)));
	memset(spdOutDb, 0, (dbSize * sizeof(struct _mv_nfp_sec_spd_rule)));
	memset(saInDb, 0, (dbSize * sizeof(struct _mv_nfp_sec_sa_entry)));
	memset(saOutDb, 0, (dbSize * sizeof(struct _mv_nfp_sec_sa_entry)));

	return MV_OK;

}

MV_STATUS mvNfpSecDbClear(MV_VOID)
{
	MV_U32 i;
	MV_NFP_SEC_SPD_RULE *pCurrSpdInRule, *pCurrSpdOutRule;
	MV_NFP_SEC_SA_ENTRY *pCurrSAInEntery, *pCurrSAOutEntery;

	if((spdInDb  == NULL) && (spdOutDb == NULL) && (saInDb == NULL) && (saOutDb == NULL))
		return MV_NOT_INITIALIZED;

	/* assume all 4 DBs are initialized */
	for(i = 0; i < secDbSize; i++) {
		pCurrSpdInRule = (spdInDb + i);
		pCurrSpdOutRule = (spdOutDb + i);
		pCurrSAInEntery = (saInDb + i);
		pCurrSAOutEntery = (saOutDb + i);
		mvOsFree(pCurrSpdInRule);
		mvOsFree(pCurrSpdOutRule);
		mvOsFree(pCurrSAInEntery);
		mvOsFree(pCurrSAOutEntery);
	}

	spdInDb = spdOutDb = NULL;
	saInDb = saOutDb = NULL;

	return MV_OK;
}


static INLINE MV_VOID mvNfpSecClearRange(MV_U8* addr, MV_U32 size)
{
	MV_U32 i;
	MV_U8  *align;

	align = (MV_U8*)((MV_U32)addr & ~0x1f);
	
	for(i = 0; align <= (addr+size); align += CPU_D_CACHE_LINE_SIZE)
		mvOsCacheLineFlushInv(NULL, align);
}

static INLINE MV_VOID mvNfpSecInvRange(MV_U8* addr, MV_U32 size)
{
	MV_U32 i;
	MV_U8  *align;

	align = (MV_U8*)((MV_U32)addr & ~0x1f);
	
	for(i = 0; align <= (addr+size); align += CPU_D_CACHE_LINE_SIZE)
		mvOsCacheLineInv(NULL, align);
}


/****************************************************/
/* warning: need to replace DB list with hash table */
/****************************************************/
MV_NFP_SEC_SPD_RULE* mvNfpSecSPDRuleSet(MV_NFP_SEC_SPD_RULE* pSpdRule, MV_NFP_SEC_RULE_DB_DIR inOut)
{
	MV_NFP_SEC_SPD_RULE* pCurrSpdRule;
	MV_U32 currRuleIndex = 0, spdRuleCount;

	pCurrSpdRule = (inOut ? spdOutDb : spdInDb);
	spdRuleCount = (inOut ? spdOutRuleCount : spdInRuleCount);

	if(spdRuleCount >= secDbSize)
		return NULL;

	/* search if rule already exists */
	while(currRuleIndex < spdRuleCount) {
		if((pCurrSpdRule->sIp == pSpdRule->sIp) &&
		    (pCurrSpdRule->dIp == pSpdRule->dIp)
#ifdef	MV_NFP_SEC_5TUPLE_KEY_SUPPORT
 		    && (pCurrSpdRule->proto == pSpdRule->proto) &&
		    (pCurrSpdRule->srcPort == pSpdRule->srcPort) &&
		    (pCurrSpdRule->dstPort == pSpdRule->dstPort)
#endif
		  ) {
			/* rule exists - return */
			return pCurrSpdRule;
		}
		currRuleIndex++;
		pCurrSpdRule++;
	}
	
	pCurrSpdRule = (inOut ? (spdOutDb+spdRuleCount) : (spdInDb+spdRuleCount));;
	memcpy(pCurrSpdRule, pSpdRule, sizeof(struct _mv_nfp_sec_spd_rule));
	inOut ? spdOutRuleCount++ : spdInRuleCount++ ;

	return pCurrSpdRule;

}

MV_NFP_SEC_SA_ENTRY* mvNfpSecSAEntrySet(MV_NFP_SEC_SA_ENTRY* pSAEntry, MV_NFP_SEC_RULE_DB_DIR inOut)
{

	MV_NFP_SEC_SA_ENTRY* pCurrSAEntery;
	MV_U32 currEntryIndex = 0, saEntryCount;

	pCurrSAEntery = (inOut ? saOutDb : saInDb);
	saEntryCount = (inOut ? saOutEntryCount : saInEntryCount);

	if(saEntryCount >= secDbSize)
		return NULL;

	/* search if rule already exists */
	while(currEntryIndex < saEntryCount) {
		if(pCurrSAEntery->spi == pSAEntry->spi) {
			/* rule exists - return */
			return pCurrSAEntery;
		}
		currEntryIndex++;
		pCurrSAEntery++;
	}

	
	pCurrSAEntery = (inOut ? (saOutDb+saEntryCount) : (saInDb+saEntryCount));
	memcpy(pCurrSAEntery, pSAEntry, sizeof(struct _mv_nfp_sec_sa_entry));
	inOut ? saOutEntryCount++ : saInEntryCount++ ;

	return pCurrSAEntery;


}

MV_STATUS mvNfpSecOutCheck(MV_PKT_INFO *pPktInfo)
{
	if(pPktInfo->pFrags->dataSize > MV_NFP_SEC_MAX_PACKET)
		return MV_OUT_OF_RANGE;
	return MV_OK;
}

INLINE MV_STATUS mvNfpSecInCheck(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY* pSAEntry)
{
		/* TBD - sequence number */
		return MV_OK;
}

MV_NFP_SEC_SPD_RULE* mvNfpSecSPDRuleFind(MV_U32 dstIp, MV_U32 srcIp,
						MV_U8 proto, MV_U16 dport, MV_U16 sport, MV_NFP_SEC_RULE_DB_DIR inOut)
{
	MV_NFP_SEC_SPD_RULE* pCurrSpdRule;
	MV_U32 currRuleIndex = 0, spdRuleCount;

	pCurrSpdRule = (inOut ? spdOutDb : spdInDb);
	spdRuleCount = (inOut ? spdOutRuleCount : spdInRuleCount);

	/* SPD DB is empty */
	if(!spdRuleCount) 
		return NULL;

	/* scan IN/OUT SPD database for matching rule */
	while(currRuleIndex < spdRuleCount) {
		if((pCurrSpdRule->sIp == srcIp) &&
		    (pCurrSpdRule->dIp == dstIp)
#ifdef	MV_NFP_SEC_5TUPLE_KEY_SUPPORT
 		&& (pCurrSpdRule->proto == proto)
		    (pCurrSpdRule->srcPort == sport) &&
		    (pCurrSpdRule->dstPort == dport)
#endif
		  ) {
			/* rule found - return */
			return pCurrSpdRule;
		}
		currRuleIndex++;
		pCurrSpdRule++;
	}

		
		return NULL;

}

INLINE MV_VOID mvNfpSecBuildMac(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY* pSAEntry)
{
        MV_802_3_HEADER *pMacHdr;

        pMacHdr = (MV_802_3_HEADER*)((MV_U8 *)(pPktInfo->pFrags[0].bufVirtPtr));
        memcpy(pMacHdr, &pSAEntry->tunnelHdr.dstMac, 12);
        pMacHdr->typeOrLen = 0x08;  /* stands for IP protocol code 16bit swapped */          
	return;	
}

INLINE MV_VOID mvNfpSecBuildIPTunnel(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY* pSAEntry)
{
	MV_IP_HEADER *pIpHdr, *pIntIpHdr;
	MV_U16 newIpTotalLength;

	newIpTotalLength = pPktInfo->pFrags[0].dataSize - sizeof(MV_802_3_HEADER);	

	pIpHdr = (MV_IP_HEADER*)(pPktInfo->pFrags[0].bufVirtPtr + 
				sizeof(MV_802_3_HEADER));
	pIntIpHdr = (MV_IP_HEADER*)((MV_U8*)(pIpHdr) + sizeof(MV_IP_HEADER) + sizeof(MV_ESP_HEADER) + 
			pSAEntry->ivSize);

	/* TBD - review below settings in RFC */
	pIpHdr->version = 0x45; 
	pIpHdr->tos = 0; 
	pIpHdr->totalLength = MV_16BIT_BE(newIpTotalLength);
	pIpHdr->identifier = 0; 
	pIpHdr->fragmentCtrl = 0; 
	pIpHdr->ttl = pIntIpHdr->ttl -1 ; 
	pIpHdr->protocol = MV_IP_PROTO_ESP; 
	pIpHdr->srcIP = pSAEntry->tunnelHdr.sIp;
	pIpHdr->dstIP = pSAEntry->tunnelHdr.dIp;

	pPktInfo->status = ETH_TX_IP_NO_FRAG | ETH_TX_GENERATE_IP_CHKSUM_MASK | 
					(0x5 << ETH_TX_IP_HEADER_LEN_OFFSET);

	return;
}

/* Append sequence number and spi, save some space for IV */
INLINE MV_VOID mvNfpSecBuildEspHdr(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY* pSAEntry)
{
	MV_ESP_HEADER *pEspHdr;

	pEspHdr = (MV_ESP_HEADER*)(pPktInfo->pFrags[0].bufVirtPtr + 
			sizeof(MV_802_3_HEADER) + sizeof(MV_IP_HEADER));	
	pEspHdr->spi = pSAEntry->spi;
	pSAEntry->seqNum = (pSAEntry->seqNum++);
	pEspHdr->seqNum = MV_32BIT_BE(pSAEntry->seqNum);
	return;	
}

MV_STATUS mvNfpSecEspProcess(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY* pSAEntry)
{
	MV_CESA_COMMAND	*pCesaCmd;
	MV_CESA_MBUF cesaMbuf;
	MV_NFP_SEC_CESA_PRIV *pCesaPriv;
	MV_STATUS status;

	pCesaCmd = &cesaCmdArray[cesaCmdIndx++];
	cesaCmdIndx = cesaCmdIndx%(MV_NFP_SEC_Q_SIZE);
	pCesaPriv = &cesaPrivArray[cesaPrivIndx++];
	cesaPrivIndx = cesaPrivIndx%(MV_NFP_SEC_Q_SIZE + MV_NFP_SEC_REQ_Q_SIZE);

	pCesaPriv->pPktInfo = pPktInfo;
	pCesaPriv->pSaEntry = pSAEntry;
	pCesaPriv->pCesaCmd = pCesaCmd;

	pPktInfo->pFrags[0].bufVirtPtr += MV_NFP_SEC_ESP_OFFSET;
	pPktInfo->pFrags[0].bufPhysAddr += MV_NFP_SEC_ESP_OFFSET;
	pPktInfo->pFrags[0].dataSize -= MV_NFP_SEC_ESP_OFFSET;

	cesaMbuf.pFrags = pPktInfo->pFrags;
	cesaMbuf.numFrags = 1;
	cesaMbuf.mbufSize = pPktInfo->pFrags[0].dataSize ;	

	pCesaCmd->pReqPrv = (MV_VOID*)pCesaPriv;
	pCesaCmd->sessionId = pSAEntry->sid;
	pCesaCmd->pSrc = &cesaMbuf;
	pCesaCmd->pDst = &cesaMbuf;
	pCesaCmd->skipFlush = MV_TRUE;

	/* Assume ESP */
	pCesaCmd->cryptoOffset = sizeof(MV_ESP_HEADER) + pSAEntry->ivSize;
    	pCesaCmd->cryptoLength =  pPktInfo->pFrags[0].dataSize - (sizeof(MV_ESP_HEADER) 
				  + pSAEntry->ivSize + pSAEntry->digestSize);
	pCesaCmd->ivFromUser = 0; /* relevant for encode only */
	pCesaCmd->ivOffset = sizeof(MV_ESP_HEADER);
	pCesaCmd->macOffset = 0;
	pCesaCmd->macLength = pPktInfo->pFrags[0].dataSize - pSAEntry->digestSize;
	pCesaCmd->digestOffset = pPktInfo->pFrags[0].dataSize - pSAEntry->digestSize ;

	/* save original digest in case of decrypt+auth */
	if(pSAEntry->secOp == MV_NFP_SEC_DECRYPT) {
		memcpy(pCesaPriv->orgDigest,(pPktInfo->pFrags[0].bufVirtPtr + pCesaCmd->digestOffset), 
			pSAEntry->digestSize);
		mvNfpSecInvRange((pPktInfo->pFrags[0].bufVirtPtr + pCesaCmd->digestOffset),
				 pSAEntry->digestSize);
	}
	disable_irq(CESA_IRQ);
	status = mvCesaAction(pCesaCmd);
	enable_irq(CESA_IRQ);
	if(status != MV_OK) {
		mvOsPrintf("mvNfpSecEspProcess: mvCesaAction failed !!!\n");
	}

	return status;
}

MV_STATUS mvNfpSecOutgoing(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY* pSAEntry)
{
	MV_U8* pTmp;
	MV_U32 cryptoSize, encBlockMod, flushHeaderSize;
	MV_BUF_INFO* 	pBuf = pPktInfo->pFrags;

	/* CESA Q is full drop. */
	if( cesaReqResources <= 1 )
		return 	MV_NO_RESOURCE;	

	if(MV_OK != mvNfpSecOutCheck(pPktInfo))
		return MV_NFP_NONE;
	
	/* ignore Marvell header */	
	pBuf->dataSize -= ETH_MV_HEADER_SIZE;
	pBuf->bufVirtPtr += ETH_MV_HEADER_SIZE;
	pBuf->bufPhysAddr += ETH_MV_HEADER_SIZE;

	cryptoSize = pBuf->dataSize - sizeof(MV_802_3_HEADER);
	/* Align buffer address to beginning of new packet - TBD handle VLAN tag, LLC */
	pBuf->bufAddrShift += (pSAEntry->ivSize + sizeof(MV_ESP_HEADER) + 
			     sizeof(MV_IP_HEADER));
	pBuf->bufVirtPtr -= pBuf->bufAddrShift;
	pBuf->bufPhysAddr -= pBuf->bufAddrShift;
	pBuf->dataSize += pBuf->bufAddrShift;

	encBlockMod = (cryptoSize % MV_NFP_SEC_ENC_BLOCK_SIZE);
	/* leave space for padLen + Protocol */
	if(encBlockMod > 14 ) {
		encBlockMod =  MV_NFP_SEC_ENC_BLOCK_SIZE - encBlockMod;
		encBlockMod += MV_NFP_SEC_ENC_BLOCK_SIZE;
	}
	else 
		encBlockMod =  MV_NFP_SEC_ENC_BLOCK_SIZE - encBlockMod;

	pBuf->dataSize += encBlockMod;
	pTmp = pBuf->bufVirtPtr + pBuf->dataSize;
	memset(pTmp - encBlockMod, 0, encBlockMod - 2);
	*((MV_U8*)(pTmp-2)) = (MV_U8)(encBlockMod-2);
	*((MV_U8*)(pTmp-1)) = (MV_U8)4;
	mvNfpSecClearRange(pTmp - encBlockMod, encBlockMod);
	
	pBuf->dataSize += pSAEntry->digestSize;
	mvNfpSecBuildEspHdr(pPktInfo, pSAEntry);
	mvNfpSecBuildIPTunnel(pPktInfo, pSAEntry);
	mvNfpSecBuildMac(pPktInfo, pSAEntry);

	/* flush & invalidate new MAC, IP, & ESP headers + old ip*/
	flushHeaderSize = pBuf->bufAddrShift + sizeof(MV_IP_HEADER) + sizeof(MV_802_3_HEADER);
	mvNfpSecClearRange(pBuf->bufVirtPtr, flushHeaderSize);

	return mvNfpSecEspProcess(pPktInfo, pSAEntry);
}

MV_STATUS mvNfpSecIncoming(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY* pSAEntry)
{

	MV_BUF_INFO* pBuf = pPktInfo->pFrags;
	MV_U32 invSize;

	/* CESA Q is full drop. */
	if( cesaReqResources <= 1 )
		return 	MV_NO_RESOURCE;	

	/* TBD - duplicate invalidatation */
	if(MV_OK != mvNfpSecInCheck(pPktInfo, pSAEntry))
		return	MV_ERROR;
 
	/* ignore Marvell header */	
	pBuf->dataSize -= ETH_MV_HEADER_SIZE;
	pBuf->bufVirtPtr += ETH_MV_HEADER_SIZE;
	pBuf->bufPhysAddr += ETH_MV_HEADER_SIZE;

	/* update buffer address shift value */
	pPktInfo->pFrags->bufAddrShift -= (pSAEntry->ivSize + sizeof(MV_ESP_HEADER) + 
			     sizeof(MV_IP_HEADER));

	/* invalidate MAC, IP & ESP  headers */
	invSize = sizeof(MV_802_3_HEADER) + sizeof(MV_IP_HEADER) + sizeof(MV_ESP_HEADER);
	mvNfpSecInvRange(pBuf->bufVirtPtr, invSize);

	return mvNfpSecEspProcess(pPktInfo, pSAEntry);
}

MV_NFP_SEC_SA_ENTRY* mvNfpSecSARuleFind(MV_U32 spiPkt)
{
	MV_NFP_SEC_SA_ENTRY* pCurrSAEntery = saInDb;
	MV_U32 currEntryIndex = 0;

	while(currEntryIndex < saInEntryCount) {
		if(pCurrSAEntery->spi == spiPkt)
			return pCurrSAEntery;
		currEntryIndex++;
		pCurrSAEntery++;
	}

	return NULL;
	
}

MV_VOID mvNfpSecDbPrint(MV_VOID)
{
	MV_U32 i;

	printk("NFP-IPSec DB info:\n");
	for(i = 0; i < spdInRuleCount; i++)
		printk("inbound-entry #%d: srcip=0x%x, dstip=0x%x\n",i,spdInDb[i].sIp, spdInDb[i].dIp);

	for(i = 0; i < spdOutRuleCount; i++)
		printk("outbound-entry #%d: srcip=0x%x, dstip=0x%x\n",i,spdOutDb[i].sIp, spdOutDb[i].dIp);

}