include/net/ipv6.h - kernel/msm - Gitiles

 /*
  *	Linux INET6 implementation
  *
  *	Authors:
  *	Pedro Roque		<roque@di.fc.ul.pt>
  *
  *	$Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
  *
  *	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.
  */

 #ifndef _NET_IPV6_H
 #define _NET_IPV6_H

 #include <linux/ipv6.h>
 #include <linux/hardirq.h>
 #include <net/ndisc.h>
 #include <net/flow.h>
 #include <net/snmp.h>

 #define SIN6_LEN_RFC2133	24

 #define IPV6_MAXPLEN		65535

 /*
  *	NextHeader field of IPv6 header
  */

 #define NEXTHDR_HOP		0	/* Hop-by-hop option header. */
 #define NEXTHDR_TCP		6	/* TCP segment. */
 #define NEXTHDR_UDP		17	/* UDP message. */
 #define NEXTHDR_IPV6		41	/* IPv6 in IPv6 */
 #define NEXTHDR_ROUTING		43	/* Routing header. */
 #define NEXTHDR_FRAGMENT	44	/* Fragmentation/reassembly header. */
 #define NEXTHDR_ESP		50	/* Encapsulating security payload. */
 #define NEXTHDR_AUTH		51	/* Authentication header. */
 #define NEXTHDR_ICMP		58	/* ICMP for IPv6. */
 #define NEXTHDR_NONE		59	/* No next header */
 #define NEXTHDR_DEST		60	/* Destination options header. */

 #define NEXTHDR_MAX		255


 #define IPV6_DEFAULT_HOPLIMIT   64
 #define IPV6_DEFAULT_MCASTHOPS	1

 /*
  *	Addr type
  *
  *	type	-	unicast | multicast
  *	scope	-	local	| site	    | global
  *	v4	-	compat
  *	v4mapped
  *	any
  *	loopback
  */

 #define IPV6_ADDR_ANY		0x0000U

 #define IPV6_ADDR_UNICAST      	0x0001U
 #define IPV6_ADDR_MULTICAST    	0x0002U

 #define IPV6_ADDR_LOOPBACK	0x0010U
 #define IPV6_ADDR_LINKLOCAL	0x0020U
 #define IPV6_ADDR_SITELOCAL	0x0040U

 #define IPV6_ADDR_COMPATv4	0x0080U

 #define IPV6_ADDR_SCOPE_MASK	0x00f0U

 #define IPV6_ADDR_MAPPED	0x1000U
 #define IPV6_ADDR_RESERVED	0x2000U	/* reserved address space */

 /*
  *	Addr scopes
  */
 #ifdef __KERNEL__
 #define IPV6_ADDR_MC_SCOPE(a)	\
 	((a)->s6_addr[1] & 0x0f)	/* nonstandard */
 #define __IPV6_ADDR_SCOPE_INVALID	-1
 #endif
 #define IPV6_ADDR_SCOPE_NODELOCAL	0x01
 #define IPV6_ADDR_SCOPE_LINKLOCAL	0x02
 #define IPV6_ADDR_SCOPE_SITELOCAL	0x05
 #define IPV6_ADDR_SCOPE_ORGLOCAL	0x08
 #define IPV6_ADDR_SCOPE_GLOBAL		0x0e

 /*
  *	fragmentation header
  */

 struct frag_hdr {
 	unsigned char	nexthdr;
 	unsigned char	reserved;
 	unsigned short	frag_off;
 	__u32		identification;
 };

 #define	IP6_MF	0x0001

 #ifdef __KERNEL__

 #include <net/sock.h>

 /* sysctls */
 extern int sysctl_ipv6_bindv6only;
 extern int sysctl_mld_max_msf;

 /* MIBs */
 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 #define IP6_INC_STATS(field)		SNMP_INC_STATS(ipv6_statistics, field)
 #define IP6_INC_STATS_BH(field)		SNMP_INC_STATS_BH(ipv6_statistics, field)
 #define IP6_INC_STATS_USER(field) 	SNMP_INC_STATS_USER(ipv6_statistics, field)
 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 #define ICMP6_INC_STATS(idev, field)		({			\
 	struct inet6_dev *_idev = (idev);				\
 	if (likely(_idev != NULL))					\
 		SNMP_INC_STATS(idev->stats.icmpv6, field); 		\
 	SNMP_INC_STATS(icmpv6_statistics, field);			\
 })
 #define ICMP6_INC_STATS_BH(idev, field)		({			\
 	struct inet6_dev *_idev = (idev);				\
 	if (likely(_idev != NULL))					\
 		SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field);	\
 	SNMP_INC_STATS_BH(icmpv6_statistics, field);			\
 })
 #define ICMP6_INC_STATS_USER(idev, field) 	({			\
 	struct inet6_dev *_idev = (idev);				\
 	if (likely(_idev != NULL))					\
 		SNMP_INC_STATS_USER(_idev->stats.icmpv6, field);	\
 	SNMP_INC_STATS_USER(icmpv6_statistics, field);			\
 })
 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)	({			\
 	struct inet6_dev *_idev = idev;						\
 	__typeof__(offset) _offset = (offset);					\
 	if (likely(_idev != NULL))						\
 		SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);	\
 	SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);    	\
 })
 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 #define UDP6_INC_STATS(field)		SNMP_INC_STATS(udp_stats_in6, field)
 #define UDP6_INC_STATS_BH(field)	SNMP_INC_STATS_BH(udp_stats_in6, field)
 #define UDP6_INC_STATS_USER(field) 	SNMP_INC_STATS_USER(udp_stats_in6, field)
 extern atomic_t			inet6_sock_nr;

 int snmp6_register_dev(struct inet6_dev *idev);
 int snmp6_unregister_dev(struct inet6_dev *idev);
 int snmp6_alloc_dev(struct inet6_dev *idev);
 int snmp6_free_dev(struct inet6_dev *idev);
 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
 void snmp6_mib_free(void *ptr[2]);

 struct ip6_ra_chain
 {
 	struct ip6_ra_chain	*next;
 	struct sock		*sk;
 	int			sel;
 	void			(*destructor)(struct sock *);
 };

 extern struct ip6_ra_chain	*ip6_ra_chain;
 extern rwlock_t ip6_ra_lock;

 /*
    This structure is prepared by protocol, when parsing
    ancillary data and passed to IPv6.
  */

 struct ipv6_txoptions
 {
 	/* Length of this structure */
 	int			tot_len;

 	/* length of extension headers   */

 	__u16			opt_flen;	/* after fragment hdr */
 	__u16			opt_nflen;	/* before fragment hdr */

 	struct ipv6_opt_hdr	*hopopt;
 	struct ipv6_opt_hdr	*dst0opt;
 	struct ipv6_rt_hdr	*srcrt;	/* Routing Header */
 	struct ipv6_opt_hdr	*auth;
 	struct ipv6_opt_hdr	*dst1opt;

 	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 };

 struct ip6_flowlabel
 {
 	struct ip6_flowlabel	*next;
 	u32			label;
 	struct in6_addr		dst;
 	struct ipv6_txoptions	*opt;
 	atomic_t		users;
 	unsigned long		linger;
 	u8			share;
 	u32			owner;
 	unsigned long		lastuse;
 	unsigned long		expires;
 };

 #define IPV6_FLOWINFO_MASK	__constant_htonl(0x0FFFFFFF)
 #define IPV6_FLOWLABEL_MASK	__constant_htonl(0x000FFFFF)

 struct ipv6_fl_socklist
 {
 	struct ipv6_fl_socklist	*next;
 	struct ip6_flowlabel	*fl;
 };

 extern struct ip6_flowlabel	*fl6_sock_lookup(struct sock *sk, u32 label);
 extern struct ipv6_txoptions	*fl6_merge_options(struct ipv6_txoptions * opt_space,
 						   struct ip6_flowlabel * fl,
 						   struct ipv6_txoptions * fopt);
 extern void			fl6_free_socklist(struct sock *sk);
 extern int			ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 extern void			ip6_flowlabel_init(void);
 extern void			ip6_flowlabel_cleanup(void);

 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 {
 	if (fl)
 		atomic_dec(&fl->users);
 }

 extern int 			ip6_ra_control(struct sock *sk, int sel,
 					       void (*destructor)(struct sock *));


 extern int			ipv6_parse_hopopts(struct sk_buff *skb, int);

 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);

 extern int ip6_frag_nqueues;
 extern atomic_t ip6_frag_mem;

 #define IPV6_FRAG_TIMEOUT	(60*HZ)		/* 60 seconds */

 /*
  *	Function prototype for build_xmit
  */

 typedef int		(*inet_getfrag_t) (const void *data,
 					   struct in6_addr *addr,
 					   char *,
 					   unsigned int, unsigned int);


 extern int		ipv6_addr_type(const struct in6_addr *addr);

 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 {
 	return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 }

 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 {
 	return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
 }

 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 {
 	memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
 }

 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 				    const struct in6_addr *addr,
 				    int plen)
 {
 	/* caller must guarantee 0 <= plen <= 128 */
 	int o = plen >> 3,
 	    b = plen & 0x7;

 	memcpy(pfx->s6_addr, addr, o);
 	if (b != 0) {
 		pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 		o++;
 	}
 	if (o < 16)
 		memset(pfx->s6_addr + o, 0, 16 - o);
 }

 #ifndef __HAVE_ARCH_ADDR_SET
 static inline void ipv6_addr_set(struct in6_addr *addr,
 				     __u32 w1, __u32 w2,
 				     __u32 w3, __u32 w4)
 {
 	addr->s6_addr32[0] = w1;
 	addr->s6_addr32[1] = w2;
 	addr->s6_addr32[2] = w3;
 	addr->s6_addr32[3] = w4;
 }
 #endif

 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 				  const struct in6_addr *a2)
 {
 	return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 		a1->s6_addr32[1] == a2->s6_addr32[1] &&
 		a1->s6_addr32[2] == a2->s6_addr32[2] &&
 		a1->s6_addr32[3] == a2->s6_addr32[3]);
 }

 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
 				      unsigned int prefixlen)
 {
 	unsigned pdw, pbi;

 	/* check complete u32 in prefix */
 	pdw = prefixlen >> 5;
 	if (pdw && memcmp(a1, a2, pdw << 2))
 		return 0;

 	/* check incomplete u32 in prefix */
 	pbi = prefixlen & 0x1f;
 	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 		return 0;

 	return 1;
 }

 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 				    const struct in6_addr *a2,
 				    unsigned int prefixlen)
 {
 	return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 				   prefixlen);
 }

 static inline int ipv6_addr_any(const struct in6_addr *a)
 {
 	return ((a->s6_addr32[0] | a->s6_addr32[1] |
 		 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 }

 /*
  *	Prototypes exported by ipv6
  */

 /*
  *	rcv function (called from netdevice level)
  */

 extern int			ipv6_rcv(struct sk_buff *skb,
 					 struct net_device *dev,
 					 struct packet_type *pt);

 /*
  *	upper-layer output functions
  */
 extern int			ip6_xmit(struct sock *sk,
 					 struct sk_buff *skb,
 					 struct flowi *fl,
 					 struct ipv6_txoptions *opt,
 					 int ipfragok);

 extern int			ip6_nd_hdr(struct sock *sk,
 					   struct sk_buff *skb,
 					   struct net_device *dev,
 					   struct in6_addr *saddr,
 					   struct in6_addr *daddr,
 					   int proto, int len);

 extern int			ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);

 extern int			ip6_append_data(struct sock *sk,
 						int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 		    				void *from,
 						int length,
 						int transhdrlen,
 		      				int hlimit,
 						struct ipv6_txoptions *opt,
 						struct flowi *fl,
 						struct rt6_info *rt,
 						unsigned int flags);

 extern int			ip6_push_pending_frames(struct sock *sk);

 extern void			ip6_flush_pending_frames(struct sock *sk);

 extern int			ip6_dst_lookup(struct sock *sk,
 					       struct dst_entry **dst,
 					       struct flowi *fl);

 /*
  *	skb processing functions
  */

 extern int			ip6_output(struct sk_buff *skb);
 extern int			ip6_forward(struct sk_buff *skb);
 extern int			ip6_input(struct sk_buff *skb);
 extern int			ip6_mc_input(struct sk_buff *skb);

 /*
  *	Extension header (options) processing
  */

 extern u8 *			ipv6_build_nfrag_opts(struct sk_buff *skb,
 						      u8 *prev_hdr,
 						      struct ipv6_txoptions *opt,
 						      struct in6_addr *daddr,
 						      u32 jumbolen);
 extern u8 *			ipv6_build_frag_opts(struct sk_buff *skb,
 						     u8 *prev_hdr,
 						     struct ipv6_txoptions *opt);
 extern void 			ipv6_push_nfrag_opts(struct sk_buff *skb,
 						     struct ipv6_txoptions *opt,
 						     u8 *proto,
 						     struct in6_addr **daddr_p);
 extern void			ipv6_push_frag_opts(struct sk_buff *skb,
 						    struct ipv6_txoptions *opt,
 						    u8 *proto);

 extern int			ipv6_skip_exthdr(const struct sk_buff *, int start,
 					         u8 *nexthdrp);

 extern int 			ipv6_ext_hdr(u8 nexthdr);

 extern struct ipv6_txoptions *	ipv6_invert_rthdr(struct sock *sk,
 						  struct ipv6_rt_hdr *hdr);


 /*
  *	socket options (ipv6_sockglue.c)
  */

 extern int			ipv6_setsockopt(struct sock *sk, int level,
 						int optname,
 						char __user *optval,
 						int optlen);
 extern int			ipv6_getsockopt(struct sock *sk, int level,
 						int optname,
 						char __user *optval,
 						int __user *optlen);

 extern void			ipv6_packet_init(void);

 extern void			ipv6_packet_cleanup(void);

 extern int			ip6_datagram_connect(struct sock *sk,
 						     struct sockaddr *addr, int addr_len);

 extern int 			ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 extern void			ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
 						u32 info, u8 *payload);
 extern void			ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);

 extern int inet6_release(struct socket *sock);
 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 		      int addr_len);
 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 			 int *uaddr_len, int peer);
 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 		       unsigned long arg);

 /*
  * reassembly.c
  */
 extern int sysctl_ip6frag_high_thresh;
 extern int sysctl_ip6frag_low_thresh;
 extern int sysctl_ip6frag_time;
 extern int sysctl_ip6frag_secret_interval;

 #endif /* __KERNEL__ */
 #endif /* _NET_IPV6_H */
	/*
	* Linux INET6 implementation
	*
	* Authors:
	* Pedro Roque <roque@di.fc.ul.pt>
	*
	* $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
	*
	* 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.
	*/

	#ifndef _NET_IPV6_H
	#define _NET_IPV6_H

	#include <linux/ipv6.h>
	#include <linux/hardirq.h>
	#include <net/ndisc.h>
	#include <net/flow.h>
	#include <net/snmp.h>

	#define SIN6_LEN_RFC2133 24

	#define IPV6_MAXPLEN 65535

	/*
	* NextHeader field of IPv6 header
	*/

	#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
	#define NEXTHDR_TCP 6 /* TCP segment. */
	#define NEXTHDR_UDP 17 /* UDP message. */
	#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
	#define NEXTHDR_ROUTING 43 /* Routing header. */
	#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
	#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
	#define NEXTHDR_AUTH 51 /* Authentication header. */
	#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
	#define NEXTHDR_NONE 59 /* No next header */
	#define NEXTHDR_DEST 60 /* Destination options header. */

	#define NEXTHDR_MAX 255



	#define IPV6_DEFAULT_HOPLIMIT 64
	#define IPV6_DEFAULT_MCASTHOPS 1

	/*
	* Addr type
	*
	* type - unicast \| multicast
	* scope - local \| site \| global
	* v4 - compat
	* v4mapped
	* any
	* loopback
	*/

	#define IPV6_ADDR_ANY 0x0000U

	#define IPV6_ADDR_UNICAST 0x0001U
	#define IPV6_ADDR_MULTICAST 0x0002U

	#define IPV6_ADDR_LOOPBACK 0x0010U
	#define IPV6_ADDR_LINKLOCAL 0x0020U
	#define IPV6_ADDR_SITELOCAL 0x0040U

	#define IPV6_ADDR_COMPATv4 0x0080U

	#define IPV6_ADDR_SCOPE_MASK 0x00f0U

	#define IPV6_ADDR_MAPPED 0x1000U
	#define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */

	/*
	* Addr scopes
	*/
	#ifdef __KERNEL__
	#define IPV6_ADDR_MC_SCOPE(a) \
	((a)->s6_addr[1] & 0x0f) /* nonstandard */
	#define __IPV6_ADDR_SCOPE_INVALID -1
	#endif
	#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
	#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
	#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
	#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
	#define IPV6_ADDR_SCOPE_GLOBAL 0x0e

	/*
	* fragmentation header
	*/

	struct frag_hdr {
	unsigned char nexthdr;
	unsigned char reserved;
	unsigned short frag_off;
	__u32 identification;
	};

	#define IP6_MF 0x0001

	#ifdef __KERNEL__

	#include <net/sock.h>

	/* sysctls */
	extern int sysctl_ipv6_bindv6only;
	extern int sysctl_mld_max_msf;

	/* MIBs */
	DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
	#define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
	#define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
	#define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
	DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
	#define ICMP6_INC_STATS(idev, field) ({ \
	struct inet6_dev *_idev = (idev); \
	if (likely(_idev != NULL)) \
	SNMP_INC_STATS(idev->stats.icmpv6, field); \
	SNMP_INC_STATS(icmpv6_statistics, field); \
	})
	#define ICMP6_INC_STATS_BH(idev, field) ({ \
	struct inet6_dev *_idev = (idev); \
	if (likely(_idev != NULL)) \
	SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
	SNMP_INC_STATS_BH(icmpv6_statistics, field); \
	})
	#define ICMP6_INC_STATS_USER(idev, field) ({ \
	struct inet6_dev *_idev = (idev); \
	if (likely(_idev != NULL)) \
	SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
	SNMP_INC_STATS_USER(icmpv6_statistics, field); \
	})
	#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
	struct inet6_dev *_idev = idev; \
	__typeof__(offset) _offset = (offset); \
	if (likely(_idev != NULL)) \
	SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
	SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
	})
	DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
	#define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
	#define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
	#define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
	extern atomic_t inet6_sock_nr;

	int snmp6_register_dev(struct inet6_dev *idev);
	int snmp6_unregister_dev(struct inet6_dev *idev);
	int snmp6_alloc_dev(struct inet6_dev *idev);
	int snmp6_free_dev(struct inet6_dev *idev);
	int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
	void snmp6_mib_free(void *ptr[2]);

	struct ip6_ra_chain
	{
	struct ip6_ra_chain *next;
	struct sock *sk;
	int sel;
	void (destructor)(struct sock );
	};

	extern struct ip6_ra_chain *ip6_ra_chain;
	extern rwlock_t ip6_ra_lock;

	/*
	This structure is prepared by protocol, when parsing
	ancillary data and passed to IPv6.
	*/

	struct ipv6_txoptions
	{
	/* Length of this structure */
	int tot_len;

	/* length of extension headers */

	__u16 opt_flen; /* after fragment hdr */
	__u16 opt_nflen; /* before fragment hdr */

	struct ipv6_opt_hdr *hopopt;
	struct ipv6_opt_hdr *dst0opt;
	struct ipv6_rt_hdr srcrt; / Routing Header */
	struct ipv6_opt_hdr *auth;
	struct ipv6_opt_hdr *dst1opt;

	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
	};

	struct ip6_flowlabel
	{
	struct ip6_flowlabel *next;
	u32 label;
	struct in6_addr dst;
	struct ipv6_txoptions *opt;
	atomic_t users;
	unsigned long linger;
	u8 share;
	u32 owner;
	unsigned long lastuse;
	unsigned long expires;
	};

	#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
	#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)

	struct ipv6_fl_socklist
	{
	struct ipv6_fl_socklist *next;
	struct ip6_flowlabel *fl;
	};

	extern struct ip6_flowlabel fl6_sock_lookup(struct sock sk, u32 label);
	extern struct ipv6_txoptions fl6_merge_options(struct ipv6_txoptions opt_space,
	struct ip6_flowlabel * fl,
	struct ipv6_txoptions * fopt);
	extern void fl6_free_socklist(struct sock *sk);
	extern int ipv6_flowlabel_opt(struct sock sk, char __user optval, int optlen);
	extern void ip6_flowlabel_init(void);
	extern void ip6_flowlabel_cleanup(void);

	static inline void fl6_sock_release(struct ip6_flowlabel *fl)
	{
	if (fl)
	atomic_dec(&fl->users);
	}

	extern int ip6_ra_control(struct sock *sk, int sel,
	void (destructor)(struct sock ));


	extern int ipv6_parse_hopopts(struct sk_buff *skb, int);

	extern struct ipv6_txoptions * ipv6_dup_options(struct sock sk, struct ipv6_txoptions opt);

	extern int ip6_frag_nqueues;
	extern atomic_t ip6_frag_mem;

	#define IPV6_FRAG_TIMEOUT (60HZ) / 60 seconds */

	/*
	* Function prototype for build_xmit
	*/

	typedef int (inet_getfrag_t) (const void data,
	struct in6_addr *addr,
	char *,
	unsigned int, unsigned int);


	extern int ipv6_addr_type(const struct in6_addr *addr);

	static inline int ipv6_addr_scope(const struct in6_addr *addr)
	{
	return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
	}

	static inline int ipv6_addr_cmp(const struct in6_addr a1, const struct in6_addr a2)
	{
	return memcmp((const void ) a1, (const void ) a2, sizeof(struct in6_addr));
	}

	static inline void ipv6_addr_copy(struct in6_addr a1, const struct in6_addr a2)
	{
	memcpy((void ) a1, (const void ) a2, sizeof(struct in6_addr));
	}

	static inline void ipv6_addr_prefix(struct in6_addr *pfx,
	const struct in6_addr *addr,
	int plen)
	{
	/* caller must guarantee 0 <= plen <= 128 */
	int o = plen >> 3,
	b = plen & 0x7;

	memcpy(pfx->s6_addr, addr, o);
	if (b != 0) {
	pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
	o++;
	}
	if (o < 16)
	memset(pfx->s6_addr + o, 0, 16 - o);
	}

	#ifndef __HAVE_ARCH_ADDR_SET
	static inline void ipv6_addr_set(struct in6_addr *addr,
	__u32 w1, __u32 w2,
	__u32 w3, __u32 w4)
	{
	addr->s6_addr32[0] = w1;
	addr->s6_addr32[1] = w2;
	addr->s6_addr32[2] = w3;
	addr->s6_addr32[3] = w4;
	}
	#endif

	static inline int ipv6_addr_equal(const struct in6_addr *a1,
	const struct in6_addr *a2)
	{
	return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
	a1->s6_addr32[1] == a2->s6_addr32[1] &&
	a1->s6_addr32[2] == a2->s6_addr32[2] &&
	a1->s6_addr32[3] == a2->s6_addr32[3]);
	}

	static inline int __ipv6_prefix_equal(const u32 a1, const u32 a2,
	unsigned int prefixlen)
	{
	unsigned pdw, pbi;

	/* check complete u32 in prefix */
	pdw = prefixlen >> 5;
	if (pdw && memcmp(a1, a2, pdw << 2))
	return 0;

	/* check incomplete u32 in prefix */
	pbi = prefixlen & 0x1f;
	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
	return 0;

	return 1;
	}

	static inline int ipv6_prefix_equal(const struct in6_addr *a1,
	const struct in6_addr *a2,
	unsigned int prefixlen)
	{
	return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
	prefixlen);
	}

	static inline int ipv6_addr_any(const struct in6_addr *a)
	{
	return ((a->s6_addr32[0] \| a->s6_addr32[1] \|
	a->s6_addr32[2] \| a->s6_addr32[3] ) == 0);
	}

	/*
	* Prototypes exported by ipv6
	*/

	/*
	* rcv function (called from netdevice level)
	*/

	extern int ipv6_rcv(struct sk_buff *skb,
	struct net_device *dev,
	struct packet_type *pt);

	/*
	* upper-layer output functions
	*/
	extern int ip6_xmit(struct sock *sk,
	struct sk_buff *skb,
	struct flowi *fl,
	struct ipv6_txoptions *opt,
	int ipfragok);

	extern int ip6_nd_hdr(struct sock *sk,
	struct sk_buff *skb,
	struct net_device *dev,
	struct in6_addr *saddr,
	struct in6_addr *daddr,
	int proto, int len);

	extern int ip6_find_1stfragopt(struct sk_buff skb, u8 *nexthdr);

	extern int ip6_append_data(struct sock *sk,
	int getfrag(void from, char to, int offset, int len, int odd, struct sk_buff *skb),
	void *from,
	int length,
	int transhdrlen,
	int hlimit,
	struct ipv6_txoptions *opt,
	struct flowi *fl,
	struct rt6_info *rt,
	unsigned int flags);

	extern int ip6_push_pending_frames(struct sock *sk);

	extern void ip6_flush_pending_frames(struct sock *sk);

	extern int ip6_dst_lookup(struct sock *sk,
	struct dst_entry **dst,
	struct flowi *fl);

	/*
	* skb processing functions
	*/

	extern int ip6_output(struct sk_buff *skb);
	extern int ip6_forward(struct sk_buff *skb);
	extern int ip6_input(struct sk_buff *skb);
	extern int ip6_mc_input(struct sk_buff *skb);

	/*
	* Extension header (options) processing
	*/

	extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
	u8 *prev_hdr,
	struct ipv6_txoptions *opt,
	struct in6_addr *daddr,
	u32 jumbolen);
	extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
	u8 *prev_hdr,
	struct ipv6_txoptions *opt);
	extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
	struct ipv6_txoptions *opt,
	u8 *proto,
	struct in6_addr **daddr_p);
	extern void ipv6_push_frag_opts(struct sk_buff *skb,
	struct ipv6_txoptions *opt,
	u8 *proto);

	extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
	u8 *nexthdrp);

	extern int ipv6_ext_hdr(u8 nexthdr);

	extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
	struct ipv6_rt_hdr *hdr);


	/*
	* socket options (ipv6_sockglue.c)
	*/

	extern int ipv6_setsockopt(struct sock *sk, int level,
	int optname,
	char __user *optval,
	int optlen);
	extern int ipv6_getsockopt(struct sock *sk, int level,
	int optname,
	char __user *optval,
	int __user *optlen);

	extern void ipv6_packet_init(void);

	extern void ipv6_packet_cleanup(void);

	extern int ip6_datagram_connect(struct sock *sk,
	struct sockaddr *addr, int addr_len);

	extern int ipv6_recv_error(struct sock sk, struct msghdr msg, int len);
	extern void ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err, u16 port,
	u32 info, u8 *payload);
	extern void ipv6_local_error(struct sock sk, int err, struct flowi fl, u32 info);

	extern int inet6_release(struct socket *sock);
	extern int inet6_bind(struct socket sock, struct sockaddr uaddr,
	int addr_len);
	extern int inet6_getname(struct socket sock, struct sockaddr uaddr,
	int *uaddr_len, int peer);
	extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
	unsigned long arg);

	/*
	* reassembly.c
	*/
	extern int sysctl_ip6frag_high_thresh;
	extern int sysctl_ip6frag_low_thresh;
	extern int sysctl_ip6frag_time;
	extern int sysctl_ip6frag_secret_interval;

	#endif /* __KERNEL__ */
	#endif /* _NET_IPV6_H */