pfe/common/ipv6.h - vendor/mindspeed/drivers - Git at Google

 /*
  *  Copyright (c) 2013 Mindspeed Technologies, Inc.
  *
  *  This program is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU General Public License
  *  as published by the Free Software Foundation; either version 2
  *  of the License, or (at your option) any later version.

  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.

  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  *
  */

 #ifndef _IPV6_H_
 #define _IPV6_H_

 #include <types.h>
 #include <hal.h>

 typedef struct IPv6_HDR_STRUCT
 {
 	u16 Version_TC_FLHi;
 	u16 FlowLabelLo;
 	u16 TotalLength;
 	u8  NextHeader;
 	u8  HopLimit;
 	u32 SourceAddress[4];
 	u32 DestinationAddress[4];
 } ipv6_hdr_t;

 typedef struct IPv6_FRAG_HDR
 {
 	u8 NextHeader;
 	u8 rsvd;
 	u16 FragOffset;
 	u32 Identification;
 } ipv6_frag_hdr_t;


 typedef struct IPv6_ROUTING_HDR
 {
 	u8 NextHeader;
 	u8 HdrExtLen;
 	u8 RoutingType;
 	u8 SegmentsLeft;
 	u8 TypeSpecificData[0];
 } ipv6_routing_hdr_t;

 /* IPv6 Next Header values */
 #define IPV6_HOP_BY_HOP		0
 #define IPV6_IPIP			4
 #define IPV6_TCP			6
 #define IPV6_UDP			17
 #define IPV6_ROUTING		43
 #define IPV6_FRAGMENT		44
 #define IPV6_ESP			50
 #define IPV6_AUTHENTICATE	51
 #define IPV6_ICMP			58
 #define IPV6_NONE			59
 #define IPV6_DESTOPT		60
 #define IPV6_ETHERIP		97

 /* ICMPv6 Type Values */
 #define ICMPV6_ROUTER_SOLICIT   133
 #define ICMPV6_ROUTER_ADVT      134
 #define ICMPV6_NEIGH_SOLICIT    135
 #define ICMPV6_NEIGH_ADVT       136


 #define	IP6_MF				0x0001
 #define IP6_FRAGOFFSET		0xFFF8

 #define IPV6_MIN_MTU		1280

 #define IPV6_ADDRESS_LENGTH	16

 #define IPV6_HDR_SIZE		sizeof(ipv6_hdr_t)


 #ifdef ENDIAN_LITTLE

 #define IPV6_GET_TRAFFIC_CLASS(phdr) ((((phdr)->Version_TC_FLHi & 0x000F) << 4) | (phdr)->Version_TC_FLHi >> 12)

 #define IPV6_SET_TRAFFIC_CLASS(phdr, tc) do { \
 		u16 temp = (phdr)->Version_TC_FLHi & 0x0FF0; \
 		temp |= (tc) >> 4; \
 		temp |= ((tc) & 0xF) << 12; \
 		(phdr)->Version_TC_FLHi = temp; \
 		} while (0)

 #define IPV6_GET_VERSION(phdr) (((phdr)->Version_TC_FLHi >> 4) & 0xF)

 #define IPV6_SET_VERSION(phdr, vers) do { \
 		u16 temp = (phdr)->Version_TC_FLHi & 0xFF0F; \
 		temp |= (vers) << 4; \
 		(phdr)->Version_TC_FLHi = temp; \
 		} while (0)

 #define IPV6_GET_FLOW_LABEL_HI(phdr) (((phdr)->Version_TC_FLHi >> 8) & 0x000F)

 #define IPV6_SET_FLOW_LABEL_HI(phdr, flhi) do { \
 		u16 temp = (phdr)->Version_TC_FLHi & 0xF0FF; \
 		temp |= (flhi) << 8; \
 		(phdr)->Version_TC_FLHi = temp; \
 		} while (0)

 #define IPV6_SET_FLOW_LABEL(phdr, fl) do { \
 		u16 flhi = ((fl) >> 16) & 0x000f; \
 		IPV6_SET_FLOW_LABEL_HI((phdr), flhi); \
 		(phdr)->FlowLabelLo = htons((fl) & 0xffff); \
 		} while (0)

 #define IPV6_COPY_FLOW_LABEL(phdr_to, phdr_from) do { \
 		IPV6_SET_FLOW_LABEL_HI((phdr_to), IPV6_GET_FLOW_LABEL_HI(phdr_from)); \
 		(phdr_to)->FlowLabelLo = (phdr_from)->FlowLabelLo; \
 		} while (0)

 #else

 #define IPV6_GET_TRAFFIC_CLASS(phdr) (((phdr)->Version_TC_FLHi >> 4) & 0xFF)

 #define IPV6_SET_TRAFFIC_CLASS(phdr, tc) do { \
 		u16 temp = (phdr)->Version_TC_FLHi & 0xF00F; \
 		temp |= (tc) << 4; \
 		(phdr)->Version_TC_FLHi = temp; \
 		} while (0)

 #define IPV6_GET_VERSION(phdr) ((phdr)->Version_TC_FLHi >> 12)

 #define IPV6_SET_VERSION(phdr, vers) do { \
 		u16 temp = (phdr)->Version_TC_FLHi & 0x0FFF; \
 		temp |= (vers) << 12; \
 		(phdr)->Version_TC_FLHi = temp; \
 		} while (0)

 #define IPV6_GET_FLOW_LABEL_HI(phdr) ((phdr)->Version_TC_FLHi & 0x000F)

 #define IPV6_SET_FLOW_LABEL_HI(phdr, flhi) do { \
 		u16 temp = (phdr)->Version_TC_FLHi & 0xFFF0; \
 		temp |= (flhi); \
 		(phdr)->Version_TC_FLHi = temp; \
 		} while (0)

 #define IPV6_SET_FLOW_LABEL(phdr, fl) do { \
 		u16 flhi = ((fl) >> 16) & 0x000f; \
 		IPV6_SET_FLOW_LABEL_HI((phdr), flhi); \
 		(phdr)->FlowLabelLo = htons((fl) & 0xffff); \
 		} while (0)

 #define IPV6_COPY_FLOW_LABEL(phdr_to, phdr_from) do { \
 		IPV6_SET_FLOW_LABEL_HI((phdr_to), IPV6_GET_FLOW_LABEL_HI(phdr_from)); \
 		(phdr_to)->FlowLabelLo = (phdr_from)->FlowLabelLo; \
 		} while (0)

 #endif

 int ipv6_cmp(void *src, void *dst);

 #define IPV6_CMP(addr1, addr2) ipv6_cmp(addr1, addr2)


 static inline u32 is_ipv6_addr_any(u32 *addr)
 {
        return ((addr[0] | addr[1] | addr[2] | addr[3]) == 0);
 }


 /** Compares 2 IPv6 addresses based on a mask.
  * No assumptions are made on the alignment of addresses.
  * @param a1		Pointer to first IPv6 address.
  * @param a2		Pointer to second IPv6 address.
  * @param masklen	Length of mask to use during comparison (a length of 128 means the 2 addresses must be identical).
  * @return	1 if the 2 addresses match, 0 otherwise.
  */
 #if defined(COMCERTO_2000_CLASS) || defined(COMCERTO_2000_UTIL)
 static inline int ipv6_cmp_mask(u32 *a1, u32 *a2, unsigned int masklen)
 {
 	u16 *a1s = (u16 *)a1;
 	u16 *a2s = (u16 *)a2;

 	while (masklen > 0) {
 		if (masklen >= 16) {
 			if (*a1s != *a2s)
 				return 0;

 			masklen -= 16;
 			a1s++;
 			a2s++;
 		} else {
 			if ((ntohs(*a1s ^ *a2s) >> (16 - masklen)) != 0)
 				return 0;
 			else
 				return 1;
 		}
 	}

 	return 1;
 }

 #else

 static inline int ipv6_cmp_mask(u32 *a1, u32 *a2, unsigned int masklen)
 {

 	// when memcmp is present - can be rewritten to burst-compare words.
 	while (masklen > 0) {

 		if (masklen >= 32) {
 			if (*a1 != *a2)
 				return 0;

 			masklen -= 32;
 			a1++;
 			a2++;
 		} else {

 			if ((ntohl(*a1 ^ *a2) >> (32 - masklen)) != 0)
 				return 0;
 			else
 				return 1;
 		}
 	}

 	return 1;
 }
 #endif

 static inline int IS_ICMPv6(void *phdr)
 {
 	u8 proto;
 	u8 *pNextHdr;
 	ipv6_hdr_t *ipv6_hdr = phdr;

 	proto = ipv6_hdr->NextHeader;
 	pNextHdr = (u8 *) (ipv6_hdr + 1);

 	// parse through any extension headers
 	while (proto != IPV6_ICMP)
 	{
 		u32 xHdrLen;

 		if ((proto != IPV6_ROUTING) && (proto != IPV6_HOP_BY_HOP) && (proto != IPV6_DESTOPT))
 			return 0;

 		proto = *pNextHdr;
 		xHdrLen = (pNextHdr[1] + 1) * 8;
 		pNextHdr += xHdrLen;
 	}

 	return 1;
 }


 static inline u32 ipv6_find_fragopt(ipv6_hdr_t *ip6h, u8 **nhdr, u32 pktlen)
 {
 	// returns length of unfragmentable part of ipv6 packet and pointer to nexthdr
 	// loosely similar to ip6_find_1stfragopt
 	int rthdr_seen = 0;
 	u16 offset = sizeof(ipv6_hdr_t);
 	u8 *this_exthdr= (u8 *) (ip6h + 1);

 	*nhdr = &ip6h->NextHeader;

 	while (offset + 1 < pktlen) {

 		switch (**nhdr) {
 		case IPV6_DESTOPT:
 			if (rthdr_seen) // if we saw routing header - all done
 				return offset;

 		case IPV6_HOP_BY_HOP:
 			break;

 		case IPV6_ROUTING:
 			rthdr_seen = 1;
 			break;

 		default:
 			return offset;
 		}

 		offset += (*(*nhdr + 1) + 1) << 3;
 		*nhdr = this_exthdr;
 		this_exthdr += (*(*nhdr + 1) + 1) << 3;
 	}

 	return offset;
 }

 static inline u8 ipv6_find_proto(ipv6_hdr_t *ip6h, u8 **nhdr, u32 pktlen)
 {
 	// very similar to ipv6_find_firstfragopt above except returns protocol found
 	// and does not maintain offset
 	int rthdr_seen = 0;
 	u16 offset = sizeof(ipv6_hdr_t);
 	u8 *this_exthdr = (u8 *)(ip6h + 1);

 	*nhdr = &ip6h->NextHeader;

 	while (offset + 1 < pktlen) {
 		switch (**nhdr) {
 		case IPV6_DESTOPT:
 			if (rthdr_seen) // if we saw routing header - all done
 				return IPV6_DESTOPT;

 		case IPV6_HOP_BY_HOP:
 			break;

 		case IPV6_ROUTING:
 			rthdr_seen = 1;
 			break;

 		default:
 			return **nhdr;
 		}

 		offset += (*(*nhdr + 1) + 1) << 3;
 		*nhdr = this_exthdr;
 		this_exthdr += (*(*nhdr + 1) + 1) << 3;
 	}

 	return **nhdr;
 }

 static inline u8 *ipv6_find_frag_header(ipv6_hdr_t *ip6h, u32 pktlen)
 {
 	// returns length of unfragmentable part of ipv6 packet and pointer to nexthdr
 	// loosely similar to ip6_find_1stfragopt
 	u8 *nhdr;
 	u16 offset = sizeof(ipv6_hdr_t);
 	u8 *this_exthdr = (u8 *)(ip6h + 1);

 	nhdr = &ip6h->NextHeader;

 	while (offset + 1 < pktlen) {
 		if (*nhdr == IPV6_FRAGMENT)
 			return (nhdr);

 		offset += (*(nhdr + 1) + 1) << 3;
 		nhdr = this_exthdr;
 		this_exthdr += (*(nhdr + 1) + 1) << 3;
 	}

 	return nhdr;
 }

 static inline u32 ipv6_pseudoheader_checksum(u32 *saddr, u32 *daddr, u16 length, u8 nexthdr)
 {
 	u32 sum = 0;
 	int i;

 	for (i = 0; i < 8; i++)
 		sum += ((u16 *)saddr)[i] + ((u16 *)daddr)[i];

 	sum += length;
 	sum += ntohs((u16)nexthdr);

 	return sum;
 }

 #endif /* _IPV6_H_ */
	/*
	* Copyright (c) 2013 Mindspeed Technologies, Inc.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.

	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.

	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	*
	*
	*/

	#ifndef _IPV6_H_
	#define _IPV6_H_

	#include <types.h>
	#include <hal.h>

	typedef struct IPv6_HDR_STRUCT
	{
	u16 Version_TC_FLHi;
	u16 FlowLabelLo;
	u16 TotalLength;
	u8 NextHeader;
	u8 HopLimit;
	u32 SourceAddress[4];
	u32 DestinationAddress[4];
	} ipv6_hdr_t;

	typedef struct IPv6_FRAG_HDR
	{
	u8 NextHeader;
	u8 rsvd;
	u16 FragOffset;
	u32 Identification;
	} ipv6_frag_hdr_t;


	typedef struct IPv6_ROUTING_HDR
	{
	u8 NextHeader;
	u8 HdrExtLen;
	u8 RoutingType;
	u8 SegmentsLeft;
	u8 TypeSpecificData[0];
	} ipv6_routing_hdr_t;

	/* IPv6 Next Header values */
	#define IPV6_HOP_BY_HOP 0
	#define IPV6_IPIP 4
	#define IPV6_TCP 6
	#define IPV6_UDP 17
	#define IPV6_ROUTING 43
	#define IPV6_FRAGMENT 44
	#define IPV6_ESP 50
	#define IPV6_AUTHENTICATE 51
	#define IPV6_ICMP 58
	#define IPV6_NONE 59
	#define IPV6_DESTOPT 60
	#define IPV6_ETHERIP 97

	/* ICMPv6 Type Values */
	#define ICMPV6_ROUTER_SOLICIT 133
	#define ICMPV6_ROUTER_ADVT 134
	#define ICMPV6_NEIGH_SOLICIT 135
	#define ICMPV6_NEIGH_ADVT 136



	#define IP6_MF 0x0001
	#define IP6_FRAGOFFSET 0xFFF8

	#define IPV6_MIN_MTU 1280

	#define IPV6_ADDRESS_LENGTH 16

	#define IPV6_HDR_SIZE sizeof(ipv6_hdr_t)


	#ifdef ENDIAN_LITTLE

	#define IPV6_GET_TRAFFIC_CLASS(phdr) ((((phdr)->Version_TC_FLHi & 0x000F) << 4) \| (phdr)->Version_TC_FLHi >> 12)

	#define IPV6_SET_TRAFFIC_CLASS(phdr, tc) do { \
	u16 temp = (phdr)->Version_TC_FLHi & 0x0FF0; \
	temp \|= (tc) >> 4; \
	temp \|= ((tc) & 0xF) << 12; \
	(phdr)->Version_TC_FLHi = temp; \
	} while (0)

	#define IPV6_GET_VERSION(phdr) (((phdr)->Version_TC_FLHi >> 4) & 0xF)

	#define IPV6_SET_VERSION(phdr, vers) do { \
	u16 temp = (phdr)->Version_TC_FLHi & 0xFF0F; \
	temp \|= (vers) << 4; \
	(phdr)->Version_TC_FLHi = temp; \
	} while (0)

	#define IPV6_GET_FLOW_LABEL_HI(phdr) (((phdr)->Version_TC_FLHi >> 8) & 0x000F)

	#define IPV6_SET_FLOW_LABEL_HI(phdr, flhi) do { \
	u16 temp = (phdr)->Version_TC_FLHi & 0xF0FF; \
	temp \|= (flhi) << 8; \
	(phdr)->Version_TC_FLHi = temp; \
	} while (0)

	#define IPV6_SET_FLOW_LABEL(phdr, fl) do { \
	u16 flhi = ((fl) >> 16) & 0x000f; \
	IPV6_SET_FLOW_LABEL_HI((phdr), flhi); \
	(phdr)->FlowLabelLo = htons((fl) & 0xffff); \
	} while (0)

	#define IPV6_COPY_FLOW_LABEL(phdr_to, phdr_from) do { \
	IPV6_SET_FLOW_LABEL_HI((phdr_to), IPV6_GET_FLOW_LABEL_HI(phdr_from)); \
	(phdr_to)->FlowLabelLo = (phdr_from)->FlowLabelLo; \
	} while (0)

	#else

	#define IPV6_GET_TRAFFIC_CLASS(phdr) (((phdr)->Version_TC_FLHi >> 4) & 0xFF)

	#define IPV6_SET_TRAFFIC_CLASS(phdr, tc) do { \
	u16 temp = (phdr)->Version_TC_FLHi & 0xF00F; \
	temp \|= (tc) << 4; \
	(phdr)->Version_TC_FLHi = temp; \
	} while (0)

	#define IPV6_GET_VERSION(phdr) ((phdr)->Version_TC_FLHi >> 12)

	#define IPV6_SET_VERSION(phdr, vers) do { \
	u16 temp = (phdr)->Version_TC_FLHi & 0x0FFF; \
	temp \|= (vers) << 12; \
	(phdr)->Version_TC_FLHi = temp; \
	} while (0)

	#define IPV6_GET_FLOW_LABEL_HI(phdr) ((phdr)->Version_TC_FLHi & 0x000F)

	#define IPV6_SET_FLOW_LABEL_HI(phdr, flhi) do { \
	u16 temp = (phdr)->Version_TC_FLHi & 0xFFF0; \
	temp \|= (flhi); \
	(phdr)->Version_TC_FLHi = temp; \
	} while (0)

	#define IPV6_SET_FLOW_LABEL(phdr, fl) do { \
	u16 flhi = ((fl) >> 16) & 0x000f; \
	IPV6_SET_FLOW_LABEL_HI((phdr), flhi); \
	(phdr)->FlowLabelLo = htons((fl) & 0xffff); \
	} while (0)

	#define IPV6_COPY_FLOW_LABEL(phdr_to, phdr_from) do { \
	IPV6_SET_FLOW_LABEL_HI((phdr_to), IPV6_GET_FLOW_LABEL_HI(phdr_from)); \
	(phdr_to)->FlowLabelLo = (phdr_from)->FlowLabelLo; \
	} while (0)

	#endif

	int ipv6_cmp(void src, void dst);

	#define IPV6_CMP(addr1, addr2) ipv6_cmp(addr1, addr2)


	static inline u32 is_ipv6_addr_any(u32 *addr)
	{
	return ((addr[0] \| addr[1] \| addr[2] \| addr[3]) == 0);
	}


	/** Compares 2 IPv6 addresses based on a mask.
	* No assumptions are made on the alignment of addresses.
	* @param a1 Pointer to first IPv6 address.
	* @param a2 Pointer to second IPv6 address.
	* @param masklen Length of mask to use during comparison (a length of 128 means the 2 addresses must be identical).
	* @return 1 if the 2 addresses match, 0 otherwise.
	*/
	#if defined(COMCERTO_2000_CLASS) \|\| defined(COMCERTO_2000_UTIL)
	static inline int ipv6_cmp_mask(u32 a1, u32 a2, unsigned int masklen)
	{
	u16 a1s = (u16 )a1;
	u16 a2s = (u16 )a2;

	while (masklen > 0) {
	if (masklen >= 16) {
	if (a1s != a2s)
	return 0;

	masklen -= 16;
	a1s++;
	a2s++;
	} else {
	if ((ntohs(a1s ^ a2s) >> (16 - masklen)) != 0)
	return 0;
	else
	return 1;
	}
	}

	return 1;
	}

	#else

	static inline int ipv6_cmp_mask(u32 a1, u32 a2, unsigned int masklen)
	{

	// when memcmp is present - can be rewritten to burst-compare words.
	while (masklen > 0) {

	if (masklen >= 32) {
	if (a1 != a2)
	return 0;

	masklen -= 32;
	a1++;
	a2++;
	} else {

	if ((ntohl(a1 ^ a2) >> (32 - masklen)) != 0)
	return 0;
	else
	return 1;
	}
	}

	return 1;
	}
	#endif

	static inline int IS_ICMPv6(void *phdr)
	{
	u8 proto;
	u8 *pNextHdr;
	ipv6_hdr_t *ipv6_hdr = phdr;

	proto = ipv6_hdr->NextHeader;
	pNextHdr = (u8 *) (ipv6_hdr + 1);

	// parse through any extension headers
	while (proto != IPV6_ICMP)
	{
	u32 xHdrLen;

	if ((proto != IPV6_ROUTING) && (proto != IPV6_HOP_BY_HOP) && (proto != IPV6_DESTOPT))
	return 0;

	proto = *pNextHdr;
	xHdrLen = (pNextHdr[1] + 1) * 8;
	pNextHdr += xHdrLen;
	}

	return 1;
	}


	static inline u32 ipv6_find_fragopt(ipv6_hdr_t ip6h, u8 *nhdr, u32 pktlen)
	{
	// returns length of unfragmentable part of ipv6 packet and pointer to nexthdr
	// loosely similar to ip6_find_1stfragopt
	int rthdr_seen = 0;
	u16 offset = sizeof(ipv6_hdr_t);
	u8 this_exthdr= (u8 ) (ip6h + 1);

	*nhdr = &ip6h->NextHeader;

	while (offset + 1 < pktlen) {

	switch (**nhdr) {
	case IPV6_DESTOPT:
	if (rthdr_seen) // if we saw routing header - all done
	return offset;

	case IPV6_HOP_BY_HOP:
	break;

	case IPV6_ROUTING:
	rthdr_seen = 1;
	break;

	default:
	return offset;
	}

	offset += ((nhdr + 1) + 1) << 3;
	*nhdr = this_exthdr;
	this_exthdr += ((nhdr + 1) + 1) << 3;
	}

	return offset;
	}

	static inline u8 ipv6_find_proto(ipv6_hdr_t ip6h, u8 *nhdr, u32 pktlen)
	{
	// very similar to ipv6_find_firstfragopt above except returns protocol found
	// and does not maintain offset
	int rthdr_seen = 0;
	u16 offset = sizeof(ipv6_hdr_t);
	u8 this_exthdr = (u8 )(ip6h + 1);

	*nhdr = &ip6h->NextHeader;

	while (offset + 1 < pktlen) {
	switch (**nhdr) {
	case IPV6_DESTOPT:
	if (rthdr_seen) // if we saw routing header - all done
	return IPV6_DESTOPT;

	case IPV6_HOP_BY_HOP:
	break;

	case IPV6_ROUTING:
	rthdr_seen = 1;
	break;

	default:
	return **nhdr;
	}

	offset += ((nhdr + 1) + 1) << 3;
	*nhdr = this_exthdr;
	this_exthdr += ((nhdr + 1) + 1) << 3;
	}

	return **nhdr;
	}

	static inline u8 ipv6_find_frag_header(ipv6_hdr_t ip6h, u32 pktlen)
	{
	// returns length of unfragmentable part of ipv6 packet and pointer to nexthdr
	// loosely similar to ip6_find_1stfragopt
	u8 *nhdr;
	u16 offset = sizeof(ipv6_hdr_t);
	u8 this_exthdr = (u8 )(ip6h + 1);

	nhdr = &ip6h->NextHeader;

	while (offset + 1 < pktlen) {
	if (*nhdr == IPV6_FRAGMENT)
	return (nhdr);

	offset += (*(nhdr + 1) + 1) << 3;
	nhdr = this_exthdr;
	this_exthdr += (*(nhdr + 1) + 1) << 3;
	}

	return nhdr;
	}

	static inline u32 ipv6_pseudoheader_checksum(u32 saddr, u32 daddr, u16 length, u8 nexthdr)
	{
	u32 sum = 0;
	int i;

	for (i = 0; i < 8; i++)
	sum += ((u16 )saddr)[i] + ((u16 )daddr)[i];

	sum += length;
	sum += ntohs((u16)nexthdr);

	return sum;
	}

	#endif /* _IPV6_H_ */