ipv6.h 20.0 KB
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/*
 *	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>
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#include <net/if_inet6.h>
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#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. */
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#define NEXTHDR_GRE		47	/* GRE header. */
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#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. */
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#define NEXTHDR_MOBILITY	135	/* Mobility header. */
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#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

/*
 *	Addr scopes
 */
#define IPV6_ADDR_MC_SCOPE(a)	\
	((a)->s6_addr[1] & 0x0f)	/* nonstandard */
#define __IPV6_ADDR_SCOPE_INVALID	-1
#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

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/*
 *	Addr flags
 */
#define IPV6_ADDR_MC_FLAG_TRANSIENT(a)	\
	((a)->s6_addr[1] & 0x10)
#define IPV6_ADDR_MC_FLAG_PREFIX(a)	\
	((a)->s6_addr[1] & 0x20)
#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a)	\
	((a)->s6_addr[1] & 0x40)

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/*
 *	fragmentation header
 */

struct frag_hdr {
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	__u8	nexthdr;
	__u8	reserved;
	__be16	frag_off;
	__be32	identification;
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};

#define	IP6_MF	0x0001

#include <net/sock.h>

/* sysctls */
extern int sysctl_mld_max_msf;
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#define _DEVINC(net, statname, modifier, idev, field)			\
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({									\
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	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
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		SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
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	SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
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})
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/* per device counters are atomic_long_t */
#define _DEVINCATOMIC(net, statname, modifier, idev, field)		\
({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
		SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
	SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
})

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/* per device and per net counters are atomic_long_t */
#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)		\
({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
		SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
	SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
})

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

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

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/* MIBs */

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#define IP6_INC_STATS(net, idev,field)		\
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		_DEVINC(net, ipv6, 64, idev, field)
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#define IP6_INC_STATS_BH(net, idev,field)	\
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		_DEVINC(net, ipv6, 64_BH, idev, field)
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#define IP6_ADD_STATS(net, idev,field,val)	\
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		_DEVADD(net, ipv6, 64, idev, field, val)
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#define IP6_ADD_STATS_BH(net, idev,field,val)	\
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		_DEVADD(net, ipv6, 64_BH, idev, field, val)
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#define IP6_UPD_PO_STATS(net, idev,field,val)   \
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		_DEVUPD(net, ipv6, 64, idev, field, val)
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#define IP6_UPD_PO_STATS_BH(net, idev,field,val)   \
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		_DEVUPD(net, ipv6, 64_BH, idev, field, val)
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#define ICMP6_INC_STATS(net, idev, field)	\
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		_DEVINCATOMIC(net, icmpv6, , idev, field)
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#define ICMP6_INC_STATS_BH(net, idev, field)	\
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		_DEVINCATOMIC(net, icmpv6, _BH, idev, field)
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#define ICMP6MSGOUT_INC_STATS(net, idev, field)		\
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	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
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#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field)	\
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	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
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#define ICMP6MSGIN_INC_STATS_BH(net, idev, field)	\
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	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
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struct ip6_ra_chain {
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	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.
 */

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struct ipv6_txoptions {
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	/* 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. */
};

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struct ip6_flowlabel {
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	struct ip6_flowlabel	*next;
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	__be32			label;
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	atomic_t		users;
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	struct in6_addr		dst;
	struct ipv6_txoptions	*opt;
	unsigned long		linger;
	u8			share;
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	union {
		struct pid *pid;
		kuid_t uid;
	} owner;
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	unsigned long		lastuse;
	unsigned long		expires;
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	struct net		*fl_net;
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};

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#define IPV6_FLOWINFO_MASK	cpu_to_be32(0x0FFFFFFF)
#define IPV6_FLOWLABEL_MASK	cpu_to_be32(0x000FFFFF)
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struct ipv6_fl_socklist {
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	struct ipv6_fl_socklist	*next;
	struct ip6_flowlabel	*fl;
};

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extern struct ip6_flowlabel	*fl6_sock_lookup(struct sock *sk, __be32 label);
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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);
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extern int			ip6_flowlabel_init(void);
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extern void			ip6_flowlabel_cleanup(void);

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

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extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);

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extern int 			ip6_ra_control(struct sock *sk, int sel);
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extern int			ipv6_parse_hopopts(struct sk_buff *skb);
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extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
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extern struct ipv6_txoptions *	ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
						   int newtype,
						   struct ipv6_opt_hdr __user *newopt,
						   int newoptlen);
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struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
					  struct ipv6_txoptions *opt);
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extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
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int ip6_frag_nqueues(struct net *net);
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int ip6_frag_mem(struct net *net);
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#define IPV6_FRAG_HIGH_THRESH	(256 * 1024)	/* 262144 */
#define IPV6_FRAG_LOW_THRESH	(192 * 1024)	/* 196608 */
#define IPV6_FRAG_TIMEOUT	(60 * HZ)	/* 60 seconds */
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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;
}
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static inline int ipv6_addr_scope(const struct in6_addr *addr)
{
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	return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
}

static inline int __ipv6_addr_src_scope(int type)
{
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	return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
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}

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

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

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static inline bool
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ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
		     const struct in6_addr *a2)
{
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	const unsigned long *ul1 = (const unsigned long *)a1;
	const unsigned long *ulm = (const unsigned long *)m;
	const unsigned long *ul2 = (const unsigned long *)a2;

	return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
		  ((ul1[1] ^ ul2[1]) & ulm[1]));
#else
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	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]));
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#endif
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}

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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;

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

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

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static inline bool ipv6_addr_equal(const struct in6_addr *a1,
				   const struct in6_addr *a2)
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{
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	const unsigned long *ul1 = (const unsigned long *)a1;
	const unsigned long *ul2 = (const unsigned long *)a2;

	return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
#else
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	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;
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#endif
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}

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static inline bool __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
				       unsigned int prefixlen)
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{
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	unsigned int pdw, pbi;
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	/* check complete u32 in prefix */
	pdw = prefixlen >> 5;
	if (pdw && memcmp(a1, a2, pdw << 2))
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		return false;
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	/* check incomplete u32 in prefix */
	pbi = prefixlen & 0x1f;
	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
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		return false;
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	return true;
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}

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

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struct inet_frag_queue;

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enum ip6_defrag_users {
	IP6_DEFRAG_LOCAL_DELIVER,
	IP6_DEFRAG_CONNTRACK_IN,
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	__IP6_DEFRAG_CONNTRACK_IN	= IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
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	IP6_DEFRAG_CONNTRACK_OUT,
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	__IP6_DEFRAG_CONNTRACK_OUT	= IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
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	IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
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	__IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
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};

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struct ip6_create_arg {
	__be32 id;
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	u32 user;
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	const struct in6_addr *src;
	const struct in6_addr *dst;
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};

void ip6_frag_init(struct inet_frag_queue *q, void *a);
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bool ip6_frag_match(struct inet_frag_queue *q, void *a);
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static inline bool ipv6_addr_any(const struct in6_addr *a)
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{
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	const unsigned long *ul = (const unsigned long *)a;

	return (ul[0] | ul[1]) == 0UL;
#else
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	return (a->s6_addr32[0] | a->s6_addr32[1] |
		a->s6_addr32[2] | a->s6_addr32[3]) == 0;
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#endif
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}

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static inline u32 ipv6_addr_hash(const struct in6_addr *a)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	const unsigned long *ul = (const unsigned long *)a;
	unsigned long x = ul[0] ^ ul[1];

	return (u32)(x ^ (x >> 32));
#else
	return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
			     a->s6_addr32[2] ^ a->s6_addr32[3]);
#endif
}

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

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

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

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

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/*
 * 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)
{
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	const __be32 *a1 = token1, *a2 = token2;
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	int i;

	addrlen >>= 2;

	for (i = 0; i < addrlen; i++) {
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		__be32 xb = a1[i] ^ a2[i];
		if (xb)
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			return i * 32 + 31 - __fls(ntohl(xb));
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	}

	/*
	 *	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)
	 */
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	return addrlen << 5;
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}

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));
}

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extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
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/*
 *	Prototypes exported by ipv6
 */

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

extern int			ipv6_rcv(struct sk_buff *skb, 
					 struct net_device *dev, 
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					 struct packet_type *pt,
					 struct net_device *orig_dev);
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extern int			ip6_rcv_finish(struct sk_buff *skb);

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/*
 *	upper-layer output functions
 */
extern int			ip6_xmit(struct sock *sk,
					 struct sk_buff *skb,
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					 struct flowi6 *fl6,
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					 struct ipv6_txoptions *opt,
					 int tclass);
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extern int			ip6_nd_hdr(struct sock *sk,
					   struct sk_buff *skb,
					   struct net_device *dev,
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					   const struct in6_addr *saddr,
					   const struct in6_addr *daddr,
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					   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,
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		      				int tclass,
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						struct ipv6_txoptions *opt,
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						struct flowi6 *fl6,
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						struct rt6_info *rt,
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						unsigned int flags,
						int dontfrag);
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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,
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					       struct flowi6 *fl6);
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extern struct dst_entry *	ip6_dst_lookup_flow(struct sock *sk,
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						    struct flowi6 *fl6,
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						    const struct in6_addr *final_dst,
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						    bool can_sleep);
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extern struct dst_entry *	ip6_sk_dst_lookup_flow(struct sock *sk,
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						       struct flowi6 *fl6,
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						       const struct in6_addr *final_dst,
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						       bool can_sleep);
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extern struct dst_entry *	ip6_blackhole_route(struct net *net,
						    struct dst_entry *orig_dst);
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/*
 *	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);

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

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/*
 *	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,
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					         u8 *nexthdrp, __be16 *frag_offp);
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extern bool			ipv6_ext_hdr(u8 nexthdr);
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extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);

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extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
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				       const struct ipv6_txoptions *opt,
				       struct in6_addr *orig);

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

extern int			ipv6_setsockopt(struct sock *sk, int level, 
						int optname,
						char __user *optval, 
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						unsigned int optlen);
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extern int			ipv6_getsockopt(struct sock *sk, int level, 
						int optname,
						char __user *optval, 
						int __user *optlen);
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extern int			compat_ipv6_setsockopt(struct sock *sk,
						int level,
						int optname,
						char __user *optval,
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						unsigned int optlen);
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extern int			compat_ipv6_getsockopt(struct sock *sk,
						int level,
						int optname,
						char __user *optval,
						int __user *optlen);
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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);
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extern int 			ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
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extern void			ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
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						u32 info, u8 *payload);
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extern void			ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
extern void			ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
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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);

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

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

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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);
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extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
				    const struct in6_addr *daddr, u32 rnd);
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#ifdef CONFIG_PROC_FS
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extern int  ac6_proc_init(struct net *net);
extern void ac6_proc_exit(struct net *net);
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extern int  raw6_proc_init(void);
extern void raw6_proc_exit(void);
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extern int  tcp6_proc_init(struct net *net);
extern void tcp6_proc_exit(struct net *net);
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extern int  udp6_proc_init(struct net *net);
extern void udp6_proc_exit(struct net *net);
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extern int  udplite6_proc_init(void);
extern void udplite6_proc_exit(void);
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extern int  ipv6_misc_proc_init(void);
extern void ipv6_misc_proc_exit(void);
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extern int snmp6_register_dev(struct inet6_dev *idev);
extern int snmp6_unregister_dev(struct inet6_dev *idev);
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#else
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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; }
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#endif
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#ifdef CONFIG_SYSCTL
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extern ctl_table ipv6_route_table_template[];
extern ctl_table ipv6_icmp_table_template[];
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extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
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extern int ipv6_sysctl_register(void);
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extern void ipv6_sysctl_unregister(void);
#endif
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#endif /* _NET_IPV6_H */