[linux.git] / include / net / ipv6.h

/*
 *	Linux INET6 implementation
 *
 *	Authors:
 *	Pedro Roque		<[email protected]>
 *
 *	$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)

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	*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,
					 struct net_device *orig_dev);

/*
 *	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 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Linux INET6 implementation
	3	*
	4	* Authors:
	5	* Pedro Roque <[email protected]>
	6	*
	7	* $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*/
	14
	15	#ifndef _NET_IPV6_H
	16	#define _NET_IPV6_H
	17
	18	#include <linux/ipv6.h>
	19	#include <linux/hardirq.h>
	20	#include <net/ndisc.h>
	21	#include <net/flow.h>
	22	#include <net/snmp.h>
	23
	24	#define SIN6_LEN_RFC2133 24
	25
	26	#define IPV6_MAXPLEN 65535
	27
	28	/*
	29	* NextHeader field of IPv6 header
	30	*/
	31
	32	#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
	33	#define NEXTHDR_TCP 6 /* TCP segment. */
	34	#define NEXTHDR_UDP 17 /* UDP message. */
	35	#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
	36	#define NEXTHDR_ROUTING 43 /* Routing header. */
	37	#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
	38	#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
	39	#define NEXTHDR_AUTH 51 /* Authentication header. */
	40	#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
	41	#define NEXTHDR_NONE 59 /* No next header */
	42	#define NEXTHDR_DEST 60 /* Destination options header. */
	43
	44	#define NEXTHDR_MAX 255
	45
	46
	47
	48	#define IPV6_DEFAULT_HOPLIMIT 64
	49	#define IPV6_DEFAULT_MCASTHOPS 1
	50
	51	/*
	52	* Addr type
	53	*
	54	* type - unicast \| multicast
	55	* scope - local \| site \| global
	56	* v4 - compat
	57	* v4mapped
	58	* any
	59	* loopback
	60	*/
	61
	62	#define IPV6_ADDR_ANY 0x0000U
	63
	64	#define IPV6_ADDR_UNICAST 0x0001U
65	#define IPV6_ADDR_MULTICAST 0x0002U
66
67	#define IPV6_ADDR_LOOPBACK 0x0010U
68	#define IPV6_ADDR_LINKLOCAL 0x0020U
69	#define IPV6_ADDR_SITELOCAL 0x0040U
70
71	#define IPV6_ADDR_COMPATv4 0x0080U
72
73	#define IPV6_ADDR_SCOPE_MASK 0x00f0U
74
75	#define IPV6_ADDR_MAPPED 0x1000U
76	#define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
77
78	/*
79	* Addr scopes
80	*/
81	#ifdef __KERNEL__
82	#define IPV6_ADDR_MC_SCOPE(a) \
83	((a)->s6_addr[1] & 0x0f) /* nonstandard */
84	#define __IPV6_ADDR_SCOPE_INVALID -1
85	#endif
86	#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
87	#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
88	#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
89	#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
90	#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
91
92	/*
93	* fragmentation header
94	*/
95
96	struct frag_hdr {
97	unsigned char nexthdr;
98	unsigned char reserved;
99	unsigned short frag_off;
100	__u32 identification;
101	};
102
103	#define IP6_MF 0x0001
104
105	#ifdef __KERNEL__
106
107	#include <net/sock.h>
108
109	/* sysctls */
110	extern int sysctl_ipv6_bindv6only;
111	extern int sysctl_mld_max_msf;
112
113	/* MIBs */
114	DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
115	#define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
116	#define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
117	#define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
118	DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
119	#define ICMP6_INC_STATS(idev, field) ({ \
120	struct inet6_dev *_idev = (idev); \
121	if (likely(_idev != NULL)) \
122	SNMP_INC_STATS(idev->stats.icmpv6, field); \
123	SNMP_INC_STATS(icmpv6_statistics, field); \
124	})
125	#define ICMP6_INC_STATS_BH(idev, field) ({ \
126	struct inet6_dev *_idev = (idev); \
127	if (likely(_idev != NULL)) \
128	SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
129	SNMP_INC_STATS_BH(icmpv6_statistics, field); \
130	})
131	#define ICMP6_INC_STATS_USER(idev, field) ({ \
132	struct inet6_dev *_idev = (idev); \
133	if (likely(_idev != NULL)) \
134	SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
135	SNMP_INC_STATS_USER(icmpv6_statistics, field); \
136	})
137	#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
138	struct inet6_dev *_idev = idev; \
139	__typeof__(offset) _offset = (offset); \
140	if (likely(_idev != NULL)) \
141	SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
142	SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
143	})
144	DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
145	#define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
146	#define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
147	#define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
1da177e4 LT	148
	149	int snmp6_register_dev(struct inet6_dev *idev);
	150	int snmp6_unregister_dev(struct inet6_dev *idev);
	151	int snmp6_alloc_dev(struct inet6_dev *idev);
	152	int snmp6_free_dev(struct inet6_dev *idev);
	153	int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
	154	void snmp6_mib_free(void *ptr[2]);
	155
	156	struct ip6_ra_chain
	157	{
	158	struct ip6_ra_chain *next;
	159	struct sock *sk;
	160	int sel;
	161	void (destructor)(struct sock );
	162	};
	163
	164	extern struct ip6_ra_chain *ip6_ra_chain;
	165	extern rwlock_t ip6_ra_lock;
	166
	167	/*
	168	This structure is prepared by protocol, when parsing
	169	ancillary data and passed to IPv6.
	170	*/
	171
	172	struct ipv6_txoptions
	173	{
	174	/* Length of this structure */
	175	int tot_len;
	176
	177	/* length of extension headers */
	178
	179	__u16 opt_flen; /* after fragment hdr */
	180	__u16 opt_nflen; /* before fragment hdr */
	181
	182	struct ipv6_opt_hdr *hopopt;
	183	struct ipv6_opt_hdr *dst0opt;
	184	struct ipv6_rt_hdr srcrt; / Routing Header */
1da177e4 LT	185	struct ipv6_opt_hdr *dst1opt;
	186
	187	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
	188	};
	189
	190	struct ip6_flowlabel
	191	{
	192	struct ip6_flowlabel *next;
	193	u32 label;
	194	struct in6_addr dst;
	195	struct ipv6_txoptions *opt;
	196	atomic_t users;
	197	unsigned long linger;
	198	u8 share;
	199	u32 owner;
	200	unsigned long lastuse;
	201	unsigned long expires;
	202	};
	203
	204	#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
	205	#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
	206
	207	struct ipv6_fl_socklist
	208	{
	209	struct ipv6_fl_socklist *next;
	210	struct ip6_flowlabel *fl;
	211	};
	212
	213	extern struct ip6_flowlabel fl6_sock_lookup(struct sock sk, u32 label);
	214	extern struct ipv6_txoptions fl6_merge_options(struct ipv6_txoptions opt_space,
	215	struct ip6_flowlabel * fl,
	216	struct ipv6_txoptions * fopt);
	217	extern void fl6_free_socklist(struct sock *sk);
	218	extern int ipv6_flowlabel_opt(struct sock sk, char __user optval, int optlen);
	219	extern void ip6_flowlabel_init(void);
	220	extern void ip6_flowlabel_cleanup(void);
	221
	222	static inline void fl6_sock_release(struct ip6_flowlabel *fl)
	223	{
	224	if (fl)
	225	atomic_dec(&fl->users);
	226	}
	227
	228	extern int ip6_ra_control(struct sock *sk, int sel,
	229	void (destructor)(struct sock ));
	230
	231
	232	extern int ipv6_parse_hopopts(struct sk_buff *skb, int);
	233
	234	extern struct ipv6_txoptions * ipv6_dup_options(struct sock sk, struct ipv6_txoptions opt);
	235
	236	extern int ip6_frag_nqueues;
	237	extern atomic_t ip6_frag_mem;
	238
	239	#define IPV6_FRAG_TIMEOUT (60HZ) / 60 seconds */
	240
	241	/*
	242	* Function prototype for build_xmit
	243	*/
	244
	245	typedef int (inet_getfrag_t) (const void data,
	246	struct in6_addr *addr,
	247	char *,
	248	unsigned int, unsigned int);
249
250
251	extern int ipv6_addr_type(const struct in6_addr *addr);
252
253	static inline int ipv6_addr_scope(const struct in6_addr *addr)
254	{
255	return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
256	}
257
258	static inline int ipv6_addr_cmp(const struct in6_addr a1, const struct in6_addr a2)
259	{
260	return memcmp((const void ) a1, (const void ) a2, sizeof(struct in6_addr));
261	}
262
263	static inline void ipv6_addr_copy(struct in6_addr a1, const struct in6_addr a2)
264	{
265	memcpy((void ) a1, (const void ) a2, sizeof(struct in6_addr));
266	}
267
268	static inline void ipv6_addr_prefix(struct in6_addr *pfx,
269	const struct in6_addr *addr,
270	int plen)
271	{
272	/* caller must guarantee 0 <= plen <= 128 */
273	int o = plen >> 3,
274	b = plen & 0x7;
275
276	memcpy(pfx->s6_addr, addr, o);
277	if (b != 0) {
278	pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
279	o++;
280	}
281	if (o < 16)
282	memset(pfx->s6_addr + o, 0, 16 - o);
283	}
284
285	#ifndef __HAVE_ARCH_ADDR_SET
286	static inline void ipv6_addr_set(struct in6_addr *addr,
287	__u32 w1, __u32 w2,
288	__u32 w3, __u32 w4)
289	{
290	addr->s6_addr32[0] = w1;
291	addr->s6_addr32[1] = w2;
292	addr->s6_addr32[2] = w3;
293	addr->s6_addr32[3] = w4;
294	}
295	#endif
296
297	static inline int ipv6_addr_equal(const struct in6_addr *a1,
298	const struct in6_addr *a2)
299	{
300	return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
301	a1->s6_addr32[1] == a2->s6_addr32[1] &&
302	a1->s6_addr32[2] == a2->s6_addr32[2] &&
303	a1->s6_addr32[3] == a2->s6_addr32[3]);
304	}
305
306	static inline int __ipv6_prefix_equal(const u32 a1, const u32 a2,
307	unsigned int prefixlen)
308	{
309	unsigned pdw, pbi;
310
311	/* check complete u32 in prefix */
312	pdw = prefixlen >> 5;
313	if (pdw && memcmp(a1, a2, pdw << 2))
314	return 0;
315
316	/* check incomplete u32 in prefix */
317	pbi = prefixlen & 0x1f;
318	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
319	return 0;
320
321	return 1;
322	}
323
324	static inline int ipv6_prefix_equal(const struct in6_addr *a1,
325	const struct in6_addr *a2,
326	unsigned int prefixlen)
327	{
328	return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
329	prefixlen);
330	}
331
332	static inline int ipv6_addr_any(const struct in6_addr *a)
333	{
334	return ((a->s6_addr32[0] \| a->s6_addr32[1] \|
335	a->s6_addr32[2] \| a->s6_addr32[3] ) == 0);
336	}
337
338	/*
339	* Prototypes exported by ipv6
340	*/
341
342	/*
343	* rcv function (called from netdevice level)
344	*/
345
346	extern int ipv6_rcv(struct sk_buff *skb,
347	struct net_device *dev,
f2ccd8fa DM	348	struct packet_type *pt,
f2ccd8fa DM	349	struct net_device *orig_dev);
1da177e4 LT	350
	351	/*
	352	* upper-layer output functions
	353	*/
	354	extern int ip6_xmit(struct sock *sk,
	355	struct sk_buff *skb,
	356	struct flowi *fl,
	357	struct ipv6_txoptions *opt,
	358	int ipfragok);
	359
	360	extern int ip6_nd_hdr(struct sock *sk,
	361	struct sk_buff *skb,
	362	struct net_device *dev,
	363	struct in6_addr *saddr,
	364	struct in6_addr *daddr,
	365	int proto, int len);
	366
	367	extern int ip6_find_1stfragopt(struct sk_buff skb, u8 *nexthdr);
	368
	369	extern int ip6_append_data(struct sock *sk,
	370	int getfrag(void from, char to, int offset, int len, int odd, struct sk_buff *skb),
	371	void *from,
	372	int length,
	373	int transhdrlen,
	374	int hlimit,
	375	struct ipv6_txoptions *opt,
	376	struct flowi *fl,
	377	struct rt6_info *rt,
	378	unsigned int flags);
	379
	380	extern int ip6_push_pending_frames(struct sock *sk);
	381
	382	extern void ip6_flush_pending_frames(struct sock *sk);
	383
	384	extern int ip6_dst_lookup(struct sock *sk,
	385	struct dst_entry **dst,
	386	struct flowi *fl);
	387
	388	/*
	389	* skb processing functions
	390	*/
	391
	392	extern int ip6_output(struct sk_buff *skb);
	393	extern int ip6_forward(struct sk_buff *skb);
	394	extern int ip6_input(struct sk_buff *skb);
	395	extern int ip6_mc_input(struct sk_buff *skb);
	396
	397	/*
	398	* Extension header (options) processing
	399	*/
	400
	401	extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
	402	u8 *prev_hdr,
	403	struct ipv6_txoptions *opt,
	404	struct in6_addr *daddr,
	405	u32 jumbolen);
	406	extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
	407	u8 *prev_hdr,
	408	struct ipv6_txoptions *opt);
	409	extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
	410	struct ipv6_txoptions *opt,
	411	u8 *proto,
	412	struct in6_addr **daddr_p);
	413	extern void ipv6_push_frag_opts(struct sk_buff *skb,
414	struct ipv6_txoptions *opt,
415	u8 *proto);
416
417	extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
0d3d077c	418	u8 *nexthdrp);
1da177e4 LT	419
	420	extern int ipv6_ext_hdr(u8 nexthdr);
	421
	422	extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
	423	struct ipv6_rt_hdr *hdr);
	424
	425
	426	/*
	427	* socket options (ipv6_sockglue.c)
	428	*/
	429
	430	extern int ipv6_setsockopt(struct sock *sk, int level,
	431	int optname,
	432	char __user *optval,
	433	int optlen);
	434	extern int ipv6_getsockopt(struct sock *sk, int level,
	435	int optname,
	436	char __user *optval,
	437	int __user *optlen);
	438
	439	extern void ipv6_packet_init(void);
	440
	441	extern void ipv6_packet_cleanup(void);
	442
	443	extern int ip6_datagram_connect(struct sock *sk,
	444	struct sockaddr *addr, int addr_len);
	445
	446	extern int ipv6_recv_error(struct sock sk, struct msghdr msg, int len);
	447	extern void ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err, u16 port,
	448	u32 info, u8 *payload);
	449	extern void ipv6_local_error(struct sock sk, int err, struct flowi fl, u32 info);
	450
	451	extern int inet6_release(struct socket *sock);
	452	extern int inet6_bind(struct socket sock, struct sockaddr uaddr,
	453	int addr_len);
	454	extern int inet6_getname(struct socket sock, struct sockaddr uaddr,
	455	int *uaddr_len, int peer);
	456	extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
	457	unsigned long arg);
	458
	459	/*
	460	* reassembly.c
	461	*/
	462	extern int sysctl_ip6frag_high_thresh;
	463	extern int sysctl_ip6frag_low_thresh;
	464	extern int sysctl_ip6frag_time;
	465	extern int sysctl_ip6frag_secret_interval;
	466
	467	#endif /* __KERNEL__ */
	468	#endif /* _NET_IPV6_H */
	469
	470
	471