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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_MBUF cesaMbufArray[MV_NFP_SEC_Q_SIZE];
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; /* static variable initialized automatically to 0 */
static int cesaPrivIndx; /* static variable initialized automatically to 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->checksum = 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);
}

MV_STATUS mvNfpSecEspProcess(MV_PKT_INFO *pPktInfo, MV_NFP_SEC_SA_ENTRY *pSAEntry)
{
	MV_CESA_COMMAND *pCesaCmd;
	MV_CESA_MBUF *pCesaMbuf;
	MV_NFP_SEC_CESA_PRIV *pCesaPriv;
	MV_STATUS status;
	MV_IP_HEADER *pIpHdr;
	MV_BUF_INFO *pBuf;

	pCesaCmd = &cesaCmdArray[cesaCmdIndx];
	pCesaMbuf = &cesaMbufArray[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;

	/*
	 *  Fix, encrypt/decrypt the IP payload only, --BK 20091027
	 */
	pBuf = pPktInfo->pFrags;
	pIpHdr = (MV_IP_HEADER *) (pBuf->bufVirtPtr + sizeof(MV_802_3_HEADER));
	pBuf->dataSize = MV_16BIT_BE(pIpHdr->totalLength) + sizeof(MV_802_3_HEADER);

	pBuf->bufVirtPtr += MV_NFP_SEC_ESP_OFFSET;
	pBuf->bufPhysAddr += MV_NFP_SEC_ESP_OFFSET;
	pBuf->dataSize -= MV_NFP_SEC_ESP_OFFSET;
	pBuf->bufAddrShift -= MV_NFP_SEC_ESP_OFFSET;

	pCesaMbuf->pFrags = pPktInfo->pFrags;
	pCesaMbuf->numFrags = 1;
	pCesaMbuf->mbufSize = pBuf->dataSize;

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

	/* Assume ESP */
	pCesaCmd->cryptoOffset = sizeof(MV_ESP_HEADER) + pSAEntry->ivSize;
	pCesaCmd->cryptoLength = pBuf->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 = pBuf->dataSize - pSAEntry->digestSize;
	pCesaCmd->digestOffset = pBuf->dataSize - pSAEntry->digestSize;

	/* save original digest in case of decrypt+auth */
	if (pSAEntry->secOp == MV_NFP_SEC_DECRYPT) {
		memcpy(pCesaPriv->orgDigest, (pBuf->bufVirtPtr + pCesaCmd->digestOffset), pSAEntry->digestSize);
		mvNfpSecInvRange((pBuf->bufVirtPtr + pCesaCmd->digestOffset), pSAEntry->digestSize);
	}

	pSAEntry->stats.bytes += pBuf->dataSize;
	if (pSAEntry->secOp == MV_NFP_SEC_DECRYPT)
		pSAEntry->stats.decrypt++;
	else
		pSAEntry->stats.encrypt++;

	disable_irq(CESA_IRQ);
	status = mvCesaAction(pCesaCmd);
	enable_irq(CESA_IRQ);
	if (status != MV_OK) {
		pSAEntry->stats.rejected++;
		mvOsPrintf("%s: mvCesaAction failed %d\n", __func__, status);
	}

	return status;
}

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

	/* CESA Q is full drop. */
	if (cesaReqResources <= 1) {
		pSAEntry->stats.rejected++;
		return MV_NO_RESOURCE;
	}

	/* encrypt payload */
	cryptoSize = pBuf->dataSize - sizeof(MV_802_3_HEADER) - ETH_MV_HEADER_SIZE;

	/* ignore Marvell header */
	pBuf->dataSize -= ETH_MV_HEADER_SIZE;
	pBuf->bufVirtPtr += ETH_MV_HEADER_SIZE;
	pBuf->bufPhysAddr += ETH_MV_HEADER_SIZE;
	pBuf->bufAddrShift -= ETH_MV_HEADER_SIZE;

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

	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;

	/* expected frame size */
	dSize = pBuf->dataSize + encBlockMod + pSAEntry->digestSize;

#ifdef CONFIG_MV_ETH_NFP_PPP
	/* keep enough room for PPPoE header */
	if (ETH_FP_IFINDEX_MAX != mvFpPppPhyIf(pSAEntry->tunnelHdr.outIfIndex))
		dSize += ETH_FP_PPPOE_HDR;
#endif

	if (dSize > ETH_FP_MTU - ETH_MV_HEADER_SIZE)
		goto rollback;

	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 */
	dSize = pBuf->bufAddrShift + sizeof(MV_IP_HEADER) + sizeof(MV_802_3_HEADER);
	mvNfpSecClearRange(pBuf->bufVirtPtr, dSize);

	return mvNfpSecEspProcess(pPktInfo, pSAEntry);

rollback:
	/* slow path */
	pBuf->bufPhysAddr += pBuf->bufAddrShift;
	pBuf->bufVirtPtr += pBuf->bufAddrShift;
	pBuf->dataSize -= pBuf->bufAddrShift;
	pBuf->bufAddrShift = 0;

	pSAEntry->stats.rejected++;
	return MV_OUT_OF_RANGE;
}

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) {
		pSAEntry->stats.rejected++;
		return MV_NO_RESOURCE;
	}

	/* TBD - duplicate invalidatation */
	if (MV_OK != mvNfpSecInCheck(pPktInfo, pSAEntry)) {
		pSAEntry->stats.rejected++;
		return MV_ERROR;
	}

	/* ignore Marvell header */
	pBuf->dataSize -= ETH_MV_HEADER_SIZE;
	pBuf->bufVirtPtr += ETH_MV_HEADER_SIZE;
	pBuf->bufPhysAddr += ETH_MV_HEADER_SIZE;
	pBuf->bufAddrShift -= ETH_MV_HEADER_SIZE;

	/* update buffer address shift value */
	/* tracked by bufAddrShift, --BK 091022 */
	/* pBuf->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 mvNfpSecSaPrint(MV_NFP_SEC_SA_ENTRY *pSAEntry)
{
	mvDebugPrintIpAddr(MV_32BIT_BE(pSAEntry->tunnelHdr.sIp));
	mvOsPrintf("->");
	mvDebugPrintIpAddr(MV_32BIT_BE(pSAEntry->tunnelHdr.dIp));
	mvOsPrintf(" out_if=%d da=", pSAEntry->tunnelHdr.outIfIndex);
	mvDebugPrintMacAddr(pSAEntry->tunnelHdr.dstMac);
	mvOsPrintf(" spi=0x%x", MV_32BIT_BE(pSAEntry->spi));

	if (pSAEntry)
		mvOsPrintf("\tstats: encrypt:%d decrypt:%d reject:%d drop:%d bytes:%d",
			   pSAEntry->stats.encrypt, pSAEntry->stats.decrypt,
			   pSAEntry->stats.rejected, pSAEntry->stats.dropped, pSAEntry->stats.bytes);
	mvOsPrintf("\n");
}

MV_VOID mvNfpSecDbPrint(MV_VOID)
{
	MV_U32 i;

	mvOsPrintf("NFP IPSec:\n");

	for (i = 0; i < spdInRuleCount; i++) {
		mvOsPrintf("inbound[%d] ", i);
		mvDebugPrintIpAddr(MV_32BIT_BE(spdInDb[i].sIp));
		mvOsPrintf("->");
		mvDebugPrintIpAddr(MV_32BIT_BE(spdInDb[i].dIp));
		mvOsPrintf(" ");
		mvNfpSecSaPrint(spdInDb[i].pSAEntry);
	}
	for (i = 0; i < spdOutRuleCount; i++) {
		mvOsPrintf("outbound[%d] ", i);
		mvDebugPrintIpAddr(MV_32BIT_BE(spdOutDb[i].sIp));
		mvOsPrintf("->");
		mvDebugPrintIpAddr(MV_32BIT_BE(spdOutDb[i].dIp));
		mvOsPrintf(" ");
		mvNfpSecSaPrint(spdOutDb[i].pSAEntry);
	}
}