[mirror_ubuntu-artful-kernel.git] / include / net / ipv6.h

/*
 *	Linux INET6 implementation
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>
 *
 *	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/if_inet6.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_MOBILITY	135	/* Mobility 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 {
	__u8	nexthdr;
	__u8	reserved;
	__be16	frag_off;
	__be32	identification;
};

#define	IP6_MF	0x0001

#ifdef __KERNEL__

#include <net/sock.h>

/* sysctls */
extern int sysctl_mld_max_msf;
extern struct ctl_path net_ipv6_ctl_path[];

#define _DEVINC(statname, modifier, idev, field)			\
({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
		SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
	SNMP_INC_STATS##modifier(statname##_statistics, (field));	\
})

#define _DEVADD(statname, modifier, idev, field, val)			\
({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
		SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
	SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
})

/* MIBs */
DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);

#define IP6_INC_STATS(idev,field)	_DEVINC(ipv6, , idev, field)
#define IP6_INC_STATS_BH(idev,field)	_DEVINC(ipv6, _BH, idev, field)
#define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)

DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);

#define ICMP6_INC_STATS(idev, field)	_DEVINC(icmpv6, , idev, field)
#define ICMP6_INC_STATS_BH(idev, field)	_DEVINC(icmpv6, _BH, idev, field)

#define ICMP6MSGOUT_INC_STATS(idev, field) \
	_DEVINC(icmpv6msg, , idev, field +256)
#define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
	_DEVINC(icmpv6msg, _BH, idev, field +256)
#define ICMP6MSGIN_INC_STATS(idev, field) \
	 _DEVINC(icmpv6msg, , idev, field)
#define ICMP6MSGIN_INC_STATS_BH(idev, field) \
	_DEVINC(icmpv6msg, _BH, idev, field)

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;
	__be32			label;
	atomic_t		users;
	struct in6_addr		dst;
	struct ipv6_txoptions	*opt;
	unsigned long		linger;
	u8			share;
	u32			owner;
	unsigned long		lastuse;
	unsigned long		expires;
	struct net		*fl_net;
};

#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, __be32 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 int			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);

extern int			ipv6_parse_hopopts(struct sk_buff *skb);

extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
extern struct ipv6_txoptions *	ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
						   int newtype,
						   struct ipv6_opt_hdr __user *newopt,
						   int newoptlen);
struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
					  struct ipv6_txoptions *opt);

extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);

int ip6_frag_nqueues(struct net *net);
int ip6_frag_mem(struct net *net);

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

extern int __ipv6_addr_type(const struct in6_addr *addr);
static inline int ipv6_addr_type(const struct in6_addr *addr)
{
	return __ipv6_addr_type(addr) & 0xffff;
}

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_src_scope(int type)
{
	return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
}

static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
{
	return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
}

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

static inline int
ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
		     const struct in6_addr *a2)
{
	return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
		   ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
		   ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
		   ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
}

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

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

static inline void ipv6_addr_set(struct in6_addr *addr, 
				     __be32 w1, __be32 w2,
				     __be32 w3, __be32 w4)
{
	addr->s6_addr32[0] = w1;
	addr->s6_addr32[1] = w2;
	addr->s6_addr32[2] = w3;
	addr->s6_addr32[3] = w4;
}

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])) == 0);
}

static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *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);
}

struct inet_frag_queue;

struct ip6_create_arg {
	__be32 id;
	struct in6_addr *src;
	struct in6_addr *dst;
};

void ip6_frag_init(struct inet_frag_queue *q, void *a);
int ip6_frag_match(struct inet_frag_queue *q, void *a);

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); 
}

static inline int ipv6_addr_loopback(const struct in6_addr *a)
{
	return ((a->s6_addr32[0] | a->s6_addr32[1] |
		 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
}

static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
{
	return ((a->s6_addr32[0] | a->s6_addr32[1] |
		 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
}

/*
 * Check for a RFC 4843 ORCHID address
 * (Overlay Routable Cryptographic Hash Identifiers)
 */
static inline int ipv6_addr_orchid(const struct in6_addr *a)
{
	return ((a->s6_addr32[0] & htonl(0xfffffff0))
		== htonl(0x20010010));
}

static inline void ipv6_addr_set_v4mapped(const __be32 addr,
					  struct in6_addr *v4mapped)
{
	ipv6_addr_set(v4mapped,
			0, 0,
			htonl(0x0000FFFF),
			addr);
}

/*
 * find the first different bit between two addresses
 * length of address must be a multiple of 32bits
 */
static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
{
	const __be32 *a1 = token1, *a2 = token2;
	int i;

	addrlen >>= 2;

	for (i = 0; i < addrlen; i++) {
		__be32 xb = a1[i] ^ a2[i];
		if (xb)
			return i * 32 + 32 - fls(ntohl(xb));
	}

	/*
	 *	we should *never* get to this point since that 
	 *	would mean the addrs are equal
	 *
	 *	However, we do get to it 8) And exacly, when
	 *	addresses are equal 8)
	 *
	 *	ip route add 1111::/128 via ...
	 *	ip route add 1111::/64 via ...
	 *	and we are here.
	 *
	 *	Ideally, this function should stop comparison
	 *	at prefix length. It does not, but it is still OK,
	 *	if returned value is greater than prefix length.
	 *					--ANK (980803)
	 */
	return (addrlen << 5);
}

static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
{
	return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
}

/*
 *	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);

extern int			ip6_rcv_finish(struct sk_buff *skb);

/*
 *	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,
					   const struct in6_addr *saddr,
					   const 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,
		      				int tclass,
						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);
extern int			ip6_dst_blackhole(struct sock *sk,
						  struct dst_entry **dst,
						  struct flowi *fl);
extern int			ip6_sk_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);

extern int			__ip6_local_out(struct sk_buff *skb);
extern int			ip6_local_out(struct sk_buff *skb);

/*
 *	Extension header (options) processing
 */

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 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);

/*
 *	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 int			compat_ipv6_setsockopt(struct sock *sk,
						int level,
						int optname,
						char __user *optval,
						int optlen);
extern int			compat_ipv6_getsockopt(struct sock *sk,
						int level,
						int optname,
						char __user *optval,
						int __user *optlen);

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, __be16 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);

extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
			      struct sock *sk);

/*
 * reassembly.c
 */
extern const struct proto_ops inet6_stream_ops;
extern const struct proto_ops inet6_dgram_ops;

struct group_source_req;
struct group_filter;

extern int ip6_mc_source(int add, int omode, struct sock *sk,
			 struct group_source_req *pgsr);
extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
			 struct group_filter __user *optval,
			 int __user *optlen);

#ifdef CONFIG_PROC_FS
extern int  ac6_proc_init(struct net *net);
extern void ac6_proc_exit(struct net *net);
extern int  raw6_proc_init(void);
extern void raw6_proc_exit(void);
extern int  tcp6_proc_init(struct net *net);
extern void tcp6_proc_exit(struct net *net);
extern int  udp6_proc_init(struct net *net);
extern void udp6_proc_exit(struct net *net);
extern int  udplite6_proc_init(void);
extern void udplite6_proc_exit(void);
extern int  ipv6_misc_proc_init(void);
extern void ipv6_misc_proc_exit(void);
extern int snmp6_register_dev(struct inet6_dev *idev);
extern int snmp6_unregister_dev(struct inet6_dev *idev);

#else
static inline int ac6_proc_init(struct net *net) { return 0; }
static inline void ac6_proc_exit(struct net *net) { }
static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
#endif

#ifdef CONFIG_SYSCTL
extern ctl_table ipv6_route_table_template[];
extern ctl_table ipv6_icmp_table_template[];

extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
extern int ipv6_sysctl_register(void);
extern void ipv6_sysctl_unregister(void);
#endif

#endif /* __KERNEL__ */
#endif /* _NET_IPV6_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Linux INET6 implementation
	3	*
	4	* Authors:
	5	* Pedro Roque <roque@di.fc.ul.pt>
	6	*
1da177e4 LT	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
	13	#ifndef _NET_IPV6_H
	14	#define _NET_IPV6_H
	15
	16	#include <linux/ipv6.h>
	17	#include <linux/hardirq.h>
20283d84	18	#include <net/if_inet6.h>
1da177e4 LT	19	#include <net/ndisc.h>
	20	#include <net/flow.h>
	21	#include <net/snmp.h>
	22
	23	#define SIN6_LEN_RFC2133 24
	24
	25	#define IPV6_MAXPLEN 65535
	26
	27	/*
	28	* NextHeader field of IPv6 header
	29	*/
	30
	31	#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
	32	#define NEXTHDR_TCP 6 /* TCP segment. */
	33	#define NEXTHDR_UDP 17 /* UDP message. */
	34	#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
	35	#define NEXTHDR_ROUTING 43 /* Routing header. */
	36	#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
	37	#define NEXTHDR_ESP 50 /* Encapsulating security payload. */
	38	#define NEXTHDR_AUTH 51 /* Authentication header. */
	39	#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
	40	#define NEXTHDR_NONE 59 /* No next header */
	41	#define NEXTHDR_DEST 60 /* Destination options header. */
2b741653	42	#define NEXTHDR_MOBILITY 135 /* Mobility header. */
1da177e4 LT	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 {
44473a6b AV	97	__u8 nexthdr;
	98	__u8 reserved;
	99	__be16 frag_off;
	100	__be32 identification;
1da177e4 LT	101	};
	102
	103	#define IP6_MF 0x0001
	104
	105	#ifdef __KERNEL__
	106
	107	#include <net/sock.h>
	108
	109	/* sysctls */
1da177e4	110	extern int sysctl_mld_max_msf;
3d7cc2ba PE	111	extern struct ctl_path net_ipv6_ctl_path[];
3d7cc2ba PE	112
14878f75 DS	113	#define _DEVINC(statname, modifier, idev, field) \
14878f75 DS	114	({ \
a11d206d YH	115	struct inet6_dev *_idev = (idev); \
a11d206d YH	116	if (likely(_idev != NULL)) \
14878f75 DS	117	SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
14878f75 DS	118	SNMP_INC_STATS##modifier(statname##_statistics, (field)); \
a11d206d	119	})
14878f75	120
8e7999c4 PE	121	#define _DEVADD(statname, modifier, idev, field, val) \
	122	({ \
	123	struct inet6_dev *_idev = (idev); \
	124	if (likely(_idev != NULL)) \
	125	SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
	126	SNMP_ADD_STATS##modifier(statname##_statistics, (field), (val));\
	127	})
	128
14878f75 DS	129	/* MIBs */
	130	DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
	131
	132	#define IP6_INC_STATS(idev,field) _DEVINC(ipv6, , idev, field)
	133	#define IP6_INC_STATS_BH(idev,field) _DEVINC(ipv6, _BH, idev, field)
8e7999c4	134	#define IP6_ADD_STATS_BH(idev,field,val) _DEVADD(ipv6, _BH, idev, field, val)
14878f75	135
1da177e4	136	DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
14878f75 DS	137	DECLARE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg_statistics);
	138
	139	#define ICMP6_INC_STATS(idev, field) _DEVINC(icmpv6, , idev, field)
	140	#define ICMP6_INC_STATS_BH(idev, field) _DEVINC(icmpv6, _BH, idev, field)
14878f75	141
14878f75 DS	142	#define ICMP6MSGOUT_INC_STATS(idev, field) \
	143	_DEVINC(icmpv6msg, , idev, field +256)
	144	#define ICMP6MSGOUT_INC_STATS_BH(idev, field) \
	145	_DEVINC(icmpv6msg, _BH, idev, field +256)
14878f75 DS	146	#define ICMP6MSGIN_INC_STATS(idev, field) \
	147	_DEVINC(icmpv6msg, , idev, field)
	148	#define ICMP6MSGIN_INC_STATS_BH(idev, field) \
	149	_DEVINC(icmpv6msg, _BH, idev, field)
14878f75	150
1da177e4 LT	151	struct ip6_ra_chain
	152	{
	153	struct ip6_ra_chain *next;
	154	struct sock *sk;
	155	int sel;
	156	void (destructor)(struct sock );
	157	};
	158
	159	extern struct ip6_ra_chain *ip6_ra_chain;
	160	extern rwlock_t ip6_ra_lock;
	161
	162	/*
	163	This structure is prepared by protocol, when parsing
	164	ancillary data and passed to IPv6.
	165	*/
	166
	167	struct ipv6_txoptions
	168	{
	169	/* Length of this structure */
	170	int tot_len;
	171
	172	/* length of extension headers */
	173
	174	__u16 opt_flen; /* after fragment hdr */
	175	__u16 opt_nflen; /* before fragment hdr */
	176
	177	struct ipv6_opt_hdr *hopopt;
	178	struct ipv6_opt_hdr *dst0opt;
	179	struct ipv6_rt_hdr srcrt; / Routing Header */
1da177e4 LT	180	struct ipv6_opt_hdr *dst1opt;
	181
	182	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
	183	};
	184
	185	struct ip6_flowlabel
	186	{
	187	struct ip6_flowlabel *next;
90bcaf7b	188	__be32 label;
db3459d1	189	atomic_t users;
1da177e4 LT	190	struct in6_addr dst;
1da177e4 LT	191	struct ipv6_txoptions *opt;
1da177e4 LT	192	unsigned long linger;
	193	u8 share;
	194	u32 owner;
	195	unsigned long lastuse;
	196	unsigned long expires;
60e8fbc4	197	struct net *fl_net;
1da177e4 LT	198	};
	199
	200	#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
	201	#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
	202
	203	struct ipv6_fl_socklist
	204	{
	205	struct ipv6_fl_socklist *next;
	206	struct ip6_flowlabel *fl;
	207	};
	208
90bcaf7b	209	extern struct ip6_flowlabel fl6_sock_lookup(struct sock sk, __be32 label);
1da177e4 LT	210	extern struct ipv6_txoptions fl6_merge_options(struct ipv6_txoptions opt_space,
	211	struct ip6_flowlabel * fl,
	212	struct ipv6_txoptions * fopt);
	213	extern void fl6_free_socklist(struct sock *sk);
	214	extern int ipv6_flowlabel_opt(struct sock sk, char __user optval, int optlen);
0a3e78ac	215	extern int ip6_flowlabel_init(void);
1da177e4 LT	216	extern void ip6_flowlabel_cleanup(void);
	217
	218	static inline void fl6_sock_release(struct ip6_flowlabel *fl)
	219	{
	220	if (fl)
	221	atomic_dec(&fl->users);
	222	}
	223
725a8ff0	224	extern int ip6_ra_control(struct sock *sk, int sel);
1da177e4	225
e5bbef20	226	extern int ipv6_parse_hopopts(struct sk_buff *skb);
1da177e4 LT	227
1da177e4 LT	228	extern struct ipv6_txoptions * ipv6_dup_options(struct sock sk, struct ipv6_txoptions opt);
333fad53 YH	229	extern struct ipv6_txoptions * ipv6_renew_options(struct sock sk, struct ipv6_txoptions opt,
	230	int newtype,
	231	struct ipv6_opt_hdr __user *newopt,
	232	int newoptlen);
df9890c3 YH	233	struct ipv6_txoptions ipv6_fixup_options(struct ipv6_txoptions opt_space,
df9890c3 YH	234	struct ipv6_txoptions *opt);
1da177e4	235
399c07de ACM	236	extern int ipv6_opt_accepted(struct sock sk, struct sk_buff skb);
399c07de ACM	237
e5a2bb84	238	int ip6_frag_nqueues(struct net *net);
6ddc0822	239	int ip6_frag_mem(struct net *net);
1da177e4 LT	240
	241	#define IPV6_FRAG_TIMEOUT (60HZ) / 60 seconds */
	242
b1cacb68 YH	243	extern int __ipv6_addr_type(const struct in6_addr *addr);
	244	static inline int ipv6_addr_type(const struct in6_addr *addr)
	245	{
	246	return __ipv6_addr_type(addr) & 0xffff;
	247	}
1da177e4 LT	248
	249	static inline int ipv6_addr_scope(const struct in6_addr *addr)
	250	{
b1cacb68 YH	251	return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
	252	}
	253
	254	static inline int __ipv6_addr_src_scope(int type)
	255	{
	256	return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
	257	}
	258
	259	static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
	260	{
	261	return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4 LT	262	}
	263
	264	static inline int ipv6_addr_cmp(const struct in6_addr a1, const struct in6_addr a2)
	265	{
db3459d1	266	return memcmp(a1, a2, sizeof(struct in6_addr));
1da177e4 LT	267	}
1da177e4 LT	268
f2ffd9ee PM	269	static inline int
	270	ipv6_masked_addr_cmp(const struct in6_addr a1, const struct in6_addr m,
	271	const struct in6_addr *a2)
	272	{
fed85383 YH	273	return (!!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) \|
	274	((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) \|
	275	((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) \|
	276	((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])));
f2ffd9ee PM	277	}
f2ffd9ee PM	278
1da177e4 LT	279	static inline void ipv6_addr_copy(struct in6_addr a1, const struct in6_addr a2)
1da177e4 LT	280	{
db3459d1	281	memcpy(a1, a2, sizeof(struct in6_addr));
1da177e4 LT	282	}
	283
	284	static inline void ipv6_addr_prefix(struct in6_addr *pfx,
	285	const struct in6_addr *addr,
	286	int plen)
	287	{
	288	/* caller must guarantee 0 <= plen <= 128 */
	289	int o = plen >> 3,
	290	b = plen & 0x7;
	291
db3459d1	292	memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
1da177e4	293	memcpy(pfx->s6_addr, addr, o);
db3459d1	294	if (b != 0)
1da177e4	295	pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
1da177e4 LT	296	}
1da177e4 LT	297
1da177e4	298	static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82 AV	299	__be32 w1, __be32 w2,
48818f82 AV	300	__be32 w3, __be32 w4)
1da177e4 LT	301	{
	302	addr->s6_addr32[0] = w1;
	303	addr->s6_addr32[1] = w2;
	304	addr->s6_addr32[2] = w3;
	305	addr->s6_addr32[3] = w4;
	306	}
1da177e4 LT	307
	308	static inline int ipv6_addr_equal(const struct in6_addr *a1,
	309	const struct in6_addr *a2)
	310	{
fed85383 YH	311	return (((a1->s6_addr32[0] ^ a2->s6_addr32[0]) \|
	312	(a1->s6_addr32[1] ^ a2->s6_addr32[1]) \|
	313	(a1->s6_addr32[2] ^ a2->s6_addr32[2]) \|
	314	(a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0);
1da177e4 LT	315	}
1da177e4 LT	316
48818f82	317	static inline int __ipv6_prefix_equal(const __be32 a1, const __be32 a2,
1da177e4 LT	318	unsigned int prefixlen)
	319	{
	320	unsigned pdw, pbi;
	321
	322	/* check complete u32 in prefix */
	323	pdw = prefixlen >> 5;
	324	if (pdw && memcmp(a1, a2, pdw << 2))
	325	return 0;
	326
	327	/* check incomplete u32 in prefix */
	328	pbi = prefixlen & 0x1f;
	329	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
	330	return 0;
	331
	332	return 1;
	333	}
	334
	335	static inline int ipv6_prefix_equal(const struct in6_addr *a1,
	336	const struct in6_addr *a2,
	337	unsigned int prefixlen)
	338	{
	339	return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
	340	prefixlen);
	341	}
	342
2588fe1d	343	struct inet_frag_queue;
2588fe1d	344
c6fda282 PE	345	struct ip6_create_arg {
	346	__be32 id;
	347	struct in6_addr *src;
	348	struct in6_addr *dst;
	349	};
	350
	351	void ip6_frag_init(struct inet_frag_queue q, void a);
abd6523d	352	int ip6_frag_match(struct inet_frag_queue q, void a);
c6fda282	353
1da177e4 LT	354	static inline int ipv6_addr_any(const struct in6_addr *a)
	355	{
	356	return ((a->s6_addr32[0] \| a->s6_addr32[1] \|
	357	a->s6_addr32[2] \| a->s6_addr32[3] ) == 0);
	358	}
	359
f630e43a YH	360	static inline int ipv6_addr_loopback(const struct in6_addr *a)
	361	{
	362	return ((a->s6_addr32[0] \| a->s6_addr32[1] \|
	363	a->s6_addr32[2] \| (a->s6_addr32[3] ^ htonl(1))) == 0);
	364	}
	365
e773e4fa BH	366	static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
e773e4fa BH	367	{
fed85383 YH	368	return ((a->s6_addr32[0] \| a->s6_addr32[1] \|
fed85383 YH	369	(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0);
e773e4fa BH	370	}
e773e4fa BH	371
99cd07a5 JMT	372	/*
	373	* Check for a RFC 4843 ORCHID address
	374	* (Overlay Routable Cryptographic Hash Identifiers)
	375	*/
	376	static inline int ipv6_addr_orchid(const struct in6_addr *a)
	377	{
	378	return ((a->s6_addr32[0] & htonl(0xfffffff0))
	379	== htonl(0x20010010));
	380	}
	381
f15364bd AC	382	static inline void ipv6_addr_set_v4mapped(const __be32 addr,
	383	struct in6_addr *v4mapped)
	384	{
	385	ipv6_addr_set(v4mapped,
	386	0, 0,
	387	htonl(0x0000FFFF),
	388	addr);
	389	}
	390
971f359d YH	391	/*
	392	* find the first different bit between two addresses
	393	* length of address must be a multiple of 32bits
	394	*/
	395	static inline int __ipv6_addr_diff(const void token1, const void token2, int addrlen)
	396	{
ef296f56	397	const __be32 a1 = token1, a2 = token2;
971f359d YH	398	int i;
	399
	400	addrlen >>= 2;
	401
	402	for (i = 0; i < addrlen; i++) {
ef296f56 AV	403	__be32 xb = a1[i] ^ a2[i];
	404	if (xb)
	405	return i * 32 + 32 - fls(ntohl(xb));
971f359d YH	406	}
	407
	408	/*
	409	* we should never get to this point since that
	410	* would mean the addrs are equal
	411	*
	412	* However, we do get to it 8) And exacly, when
	413	* addresses are equal 8)
	414	*
	415	* ip route add 1111::/128 via ...
	416	* ip route add 1111::/64 via ...
	417	* and we are here.
	418	*
	419	* Ideally, this function should stop comparison
	420	* at prefix length. It does not, but it is still OK,
	421	* if returned value is greater than prefix length.
	422	* --ANK (980803)
	423	*/
	424	return (addrlen << 5);
	425	}
	426
	427	static inline int ipv6_addr_diff(const struct in6_addr a1, const struct in6_addr a2)
	428	{
	429	return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
	430	}
	431
1da177e4 LT	432	/*
	433	* Prototypes exported by ipv6
	434	*/
	435
	436	/*
	437	* rcv function (called from netdevice level)
	438	*/
	439
	440	extern int ipv6_rcv(struct sk_buff *skb,
	441	struct net_device *dev,
f2ccd8fa DM	442	struct packet_type *pt,
f2ccd8fa DM	443	struct net_device *orig_dev);
1da177e4	444
b05e1066 PM	445	extern int ip6_rcv_finish(struct sk_buff *skb);
b05e1066 PM	446
1da177e4 LT	447	/*
	448	* upper-layer output functions
	449	*/
	450	extern int ip6_xmit(struct sock *sk,
	451	struct sk_buff *skb,
	452	struct flowi *fl,
	453	struct ipv6_txoptions *opt,
	454	int ipfragok);
	455
	456	extern int ip6_nd_hdr(struct sock *sk,
	457	struct sk_buff *skb,
	458	struct net_device *dev,
9acd9f3a YH	459	const struct in6_addr *saddr,
9acd9f3a YH	460	const struct in6_addr *daddr,
1da177e4 LT	461	int proto, int len);
	462
	463	extern int ip6_find_1stfragopt(struct sk_buff skb, u8 *nexthdr);
	464
	465	extern int ip6_append_data(struct sock *sk,
	466	int getfrag(void from, char to, int offset, int len, int odd, struct sk_buff *skb),
	467	void *from,
	468	int length,
	469	int transhdrlen,
	470	int hlimit,
41a1f8ea	471	int tclass,
1da177e4 LT	472	struct ipv6_txoptions *opt,
	473	struct flowi *fl,
	474	struct rt6_info *rt,
	475	unsigned int flags);
	476
	477	extern int ip6_push_pending_frames(struct sock *sk);
	478
	479	extern void ip6_flush_pending_frames(struct sock *sk);
	480
	481	extern int ip6_dst_lookup(struct sock *sk,
	482	struct dst_entry **dst,
	483	struct flowi *fl);
14e50e57 DM	484	extern int ip6_dst_blackhole(struct sock *sk,
	485	struct dst_entry **dst,
	486	struct flowi *fl);
497c615a HX	487	extern int ip6_sk_dst_lookup(struct sock *sk,
	488	struct dst_entry **dst,
	489	struct flowi *fl);
1da177e4 LT	490
	491	/*
	492	* skb processing functions
	493	*/
	494
	495	extern int ip6_output(struct sk_buff *skb);
	496	extern int ip6_forward(struct sk_buff *skb);
	497	extern int ip6_input(struct sk_buff *skb);
	498	extern int ip6_mc_input(struct sk_buff *skb);
	499
ef76bc23 HX	500	extern int __ip6_local_out(struct sk_buff *skb);
	501	extern int ip6_local_out(struct sk_buff *skb);
	502
1da177e4 LT	503	/*
	504	* Extension header (options) processing
	505	*/
	506
1da177e4 LT	507	extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
	508	struct ipv6_txoptions *opt,
	509	u8 *proto,
	510	struct in6_addr **daddr_p);
	511	extern void ipv6_push_frag_opts(struct sk_buff *skb,
	512	struct ipv6_txoptions *opt,
	513	u8 *proto);
	514
	515	extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
0d3d077c	516	u8 *nexthdrp);
1da177e4 LT	517
	518	extern int ipv6_ext_hdr(u8 nexthdr);
	519
c61a4043 MN	520	extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
c61a4043 MN	521
1da177e4 LT	522	/*
	523	* socket options (ipv6_sockglue.c)
	524	*/
	525
	526	extern int ipv6_setsockopt(struct sock *sk, int level,
	527	int optname,
	528	char __user *optval,
	529	int optlen);
	530	extern int ipv6_getsockopt(struct sock *sk, int level,
	531	int optname,
	532	char __user *optval,
	533	int __user *optlen);
3fdadf7d DM	534	extern int compat_ipv6_setsockopt(struct sock *sk,
	535	int level,
	536	int optname,
	537	char __user *optval,
	538	int optlen);
	539	extern int compat_ipv6_getsockopt(struct sock *sk,
	540	int level,
	541	int optname,
	542	char __user *optval,
	543	int __user *optlen);
1da177e4	544
1da177e4 LT	545	extern int ip6_datagram_connect(struct sock *sk,
	546	struct sockaddr *addr, int addr_len);
	547
	548	extern int ipv6_recv_error(struct sock sk, struct msghdr msg, int len);
e69a4adc	549	extern void ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err, __be16 port,
1da177e4 LT	550	u32 info, u8 *payload);
	551	extern void ipv6_local_error(struct sock sk, int err, struct flowi fl, u32 info);
	552
	553	extern int inet6_release(struct socket *sock);
	554	extern int inet6_bind(struct socket sock, struct sockaddr uaddr,
	555	int addr_len);
	556	extern int inet6_getname(struct socket sock, struct sockaddr uaddr,
	557	int *uaddr_len, int peer);
	558	extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
	559	unsigned long arg);
	560
d8313f5c ACM	561	extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
	562	struct sock *sk);
	563
1da177e4 LT	564	/*
	565	* reassembly.c
	566	*/
90ddc4f0 ED	567	extern const struct proto_ops inet6_stream_ops;
90ddc4f0 ED	568	extern const struct proto_ops inet6_dgram_ops;
20380731	569
14c85021 ACM	570	struct group_source_req;
	571	struct group_filter;
	572
20380731 ACM	573	extern int ip6_mc_source(int add, int omode, struct sock *sk,
	574	struct group_source_req *pgsr);
	575	extern int ip6_mc_msfilter(struct sock sk, struct group_filter gsf);
	576	extern int ip6_mc_msfget(struct sock sk, struct group_filter gsf,
	577	struct group_filter __user *optval,
	578	int __user *optlen);
	579
	580	#ifdef CONFIG_PROC_FS
6ab57e7e DL	581	extern int ac6_proc_init(struct net *net);
6ab57e7e DL	582	extern void ac6_proc_exit(struct net *net);
20380731 ACM	583	extern int raw6_proc_init(void);
20380731 ACM	584	extern void raw6_proc_exit(void);
6f8b13bc DL	585	extern int tcp6_proc_init(struct net *net);
6f8b13bc DL	586	extern void tcp6_proc_exit(struct net *net);
0c96d8c5 DL	587	extern int udp6_proc_init(struct net *net);
0c96d8c5 DL	588	extern void udp6_proc_exit(struct net *net);
ba4e58ec GR	589	extern int udplite6_proc_init(void);
ba4e58ec GR	590	extern void udplite6_proc_exit(void);
20380731 ACM	591	extern int ipv6_misc_proc_init(void);
20380731 ACM	592	extern void ipv6_misc_proc_exit(void);
7f7d9a6b HX	593	extern int snmp6_register_dev(struct inet6_dev *idev);
7f7d9a6b HX	594	extern int snmp6_unregister_dev(struct inet6_dev *idev);
20380731	595
7f7d9a6b	596	#else
6ab57e7e DL	597	static inline int ac6_proc_init(struct net *net) { return 0; }
	598	static inline void ac6_proc_exit(struct net *net) { }
	599	static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
	600	static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
20380731	601	#endif
1da177e4	602
20380731	603	#ifdef CONFIG_SYSCTL
760f2d01 DL	604	extern ctl_table ipv6_route_table_template[];
760f2d01 DL	605	extern ctl_table ipv6_icmp_table_template[];
1da177e4	606
6de1a910 DL	607	extern struct ctl_table ipv6_icmp_sysctl_init(struct net net);
6de1a910 DL	608	extern struct ctl_table ipv6_route_sysctl_init(struct net net);
291480c0	609	extern int ipv6_sysctl_register(void);
20380731 ACM	610	extern void ipv6_sysctl_unregister(void);
20380731 ACM	611	#endif
1da177e4	612
20380731 ACM	613	#endif /* __KERNEL__ */
20380731 ACM	614	#endif /* _NET_IPV6_H */