[net-next-2.6.git] / include / linux / ipv6.h

#ifndef _IPV6_H
#define _IPV6_H

#include <linux/in6.h>
#include <asm/byteorder.h>

/* The latest drafts declared increase in minimal mtu up to 1280. */

#define IPV6_MIN_MTU	1280

/*
 *	Advanced API
 *	source interface/address selection, source routing, etc...
 *	*under construction*
 */


struct in6_pktinfo {
	struct in6_addr	ipi6_addr;
	int		ipi6_ifindex;
};


struct in6_ifreq {
	struct in6_addr	ifr6_addr;
	__u32		ifr6_prefixlen;
	int		ifr6_ifindex; 
};

#define IPV6_SRCRT_STRICT	0x01	/* this hop must be a neighbor	*/
#define IPV6_SRCRT_TYPE_0	0	/* IPv6 type 0 Routing Header	*/

/*
 *	routing header
 */
struct ipv6_rt_hdr {
	__u8		nexthdr;
	__u8		hdrlen;
	__u8		type;
	__u8		segments_left;

	/*
	 *	type specific data
	 *	variable length field
	 */
};


struct ipv6_opt_hdr {
	__u8 		nexthdr;
	__u8 		hdrlen;
	/* 
	 * TLV encoded option data follows.
	 */
};

#define ipv6_destopt_hdr ipv6_opt_hdr
#define ipv6_hopopt_hdr  ipv6_opt_hdr

#ifdef __KERNEL__
#define ipv6_optlen(p)  (((p)->hdrlen+1) << 3)
#endif

/*
 *	routing header type 0 (used in cmsghdr struct)
 */

struct rt0_hdr {
	struct ipv6_rt_hdr	rt_hdr;
	__u32			reserved;
	struct in6_addr		addr[0];

#define rt0_type		rt_hdr.type
};

struct ipv6_auth_hdr {
	__u8  nexthdr;
	__u8  hdrlen;           /* This one is measured in 32 bit units! */
	__u16 reserved;
	__u32 spi;
	__u32 seq_no;           /* Sequence number */
	__u8  auth_data[0];     /* Length variable but >=4. Mind the 64 bit alignment! */
};

struct ipv6_esp_hdr {
	__u32 spi;
	__u32 seq_no;           /* Sequence number */
	__u8  enc_data[0];      /* Length variable but >=8. Mind the 64 bit alignment! */
};

struct ipv6_comp_hdr {
	__u8 nexthdr;
	__u8 flags;
	__u16 cpi;
};

/*
 *	IPv6 fixed header
 *
 *	BEWARE, it is incorrect. The first 4 bits of flow_lbl
 *	are glued to priority now, forming "class".
 */

struct ipv6hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u8			priority:4,
				version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u8			version:4,
				priority:4;
#else
#error	"Please fix <asm/byteorder.h>"
#endif
	__u8			flow_lbl[3];

	__u16			payload_len;
	__u8			nexthdr;
	__u8			hop_limit;

	struct	in6_addr	saddr;
	struct	in6_addr	daddr;
};

/*
 * This structure contains configuration options per IPv6 link.
 */
struct ipv6_devconf {
	__s32		forwarding;
	__s32		hop_limit;
	__s32		mtu6;
	__s32		accept_ra;
	__s32		accept_redirects;
	__s32		autoconf;
	__s32		dad_transmits;
	__s32		rtr_solicits;
	__s32		rtr_solicit_interval;
	__s32		rtr_solicit_delay;
	__s32		force_mld_version;
#ifdef CONFIG_IPV6_PRIVACY
	__s32		use_tempaddr;
	__s32		temp_valid_lft;
	__s32		temp_prefered_lft;
	__s32		regen_max_retry;
	__s32		max_desync_factor;
#endif
	__s32		max_addresses;
	__s32		accept_ra_defrtr;
	__s32		accept_ra_pinfo;
#ifdef CONFIG_IPV6_ROUTER_PREF
	__s32		accept_ra_rtr_pref;
	__s32		rtr_probe_interval;
#ifdef CONFIG_IPV6_ROUTE_INFO
	__s32		accept_ra_rt_info_max_plen;
#endif
#endif
	void		*sysctl;
};

/* index values for the variables in ipv6_devconf */
enum {
	DEVCONF_FORWARDING = 0,
	DEVCONF_HOPLIMIT,
	DEVCONF_MTU6,
	DEVCONF_ACCEPT_RA,
	DEVCONF_ACCEPT_REDIRECTS,
	DEVCONF_AUTOCONF,
	DEVCONF_DAD_TRANSMITS,
	DEVCONF_RTR_SOLICITS,
	DEVCONF_RTR_SOLICIT_INTERVAL,
	DEVCONF_RTR_SOLICIT_DELAY,
	DEVCONF_USE_TEMPADDR,
	DEVCONF_TEMP_VALID_LFT,
	DEVCONF_TEMP_PREFERED_LFT,
	DEVCONF_REGEN_MAX_RETRY,
	DEVCONF_MAX_DESYNC_FACTOR,
	DEVCONF_MAX_ADDRESSES,
	DEVCONF_FORCE_MLD_VERSION,
	DEVCONF_ACCEPT_RA_DEFRTR,
	DEVCONF_ACCEPT_RA_PINFO,
	DEVCONF_ACCEPT_RA_RTR_PREF,
	DEVCONF_RTR_PROBE_INTERVAL,
	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
	DEVCONF_MAX
};

#ifdef __KERNEL__
#include <linux/icmpv6.h>
#include <linux/tcp.h>
#include <linux/udp.h>

#include <net/if_inet6.h>       /* struct ipv6_mc_socklist */
#include <net/inet_sock.h>

/* 
   This structure contains results of exthdrs parsing
   as offsets from skb->nh.
 */

struct inet6_skb_parm {
	int			iif;
	__u16			ra;
	__u16			hop;
	__u16			dst0;
	__u16			srcrt;
	__u16			dst1;
	__u16			lastopt;
	__u32			nhoff;
	__u16			flags;

#define IP6SKB_XFRM_TRANSFORMED	1
};

#define IP6CB(skb)	((struct inet6_skb_parm*)((skb)->cb))

static inline int inet6_iif(const struct sk_buff *skb)
{
	return IP6CB(skb)->iif;
}

struct inet6_request_sock {
	struct in6_addr		loc_addr;
	struct in6_addr		rmt_addr;
	struct sk_buff		*pktopts;
	int			iif;
};

struct tcp6_request_sock {
	struct tcp_request_sock	  tcp6rsk_tcp;
	struct inet6_request_sock tcp6rsk_inet6;
};

/**
 * struct ipv6_pinfo - ipv6 private area
 *
 * In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
 * this _must_ be the last member, so that inet6_sk_generic
 * is able to calculate its offset from the base struct sock
 * by using the struct proto->slab_obj_size member. -acme
 */
struct ipv6_pinfo {
	struct in6_addr 	saddr;
	struct in6_addr 	rcv_saddr;
	struct in6_addr		daddr;
	struct in6_addr		*daddr_cache;

	__u32			flow_label;
	__u32			frag_size;
	__s16			hop_limit;
	__s16			mcast_hops;
	int			mcast_oif;

	/* pktoption flags */
	union {
		struct {
			__u16	srcrt:2,
				osrcrt:2,
			        rxinfo:1,
			        rxoinfo:1,
				rxhlim:1,
				rxohlim:1,
				hopopts:1,
				ohopopts:1,
				dstopts:1,
				odstopts:1,
                                rxflow:1,
				rxtclass:1;
		} bits;
		__u16		all;
	} rxopt;

	/* sockopt flags */
	__u8			mc_loop:1,
	                        recverr:1,
	                        sndflow:1,
				pmtudisc:2,
				ipv6only:1;
	__u8			tclass;

	__u32			dst_cookie;

	struct ipv6_mc_socklist	*ipv6_mc_list;
	struct ipv6_ac_socklist	*ipv6_ac_list;
	struct ipv6_fl_socklist *ipv6_fl_list;

	struct ipv6_txoptions	*opt;
	struct sk_buff		*pktoptions;
	struct {
		struct ipv6_txoptions *opt;
		struct rt6_info	*rt;
		int hop_limit;
		int tclass;
	} cork;
};

/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
struct raw6_sock {
	/* inet_sock has to be the first member of raw6_sock */
	struct inet_sock	inet;
	__u32			checksum;	/* perform checksum */
	__u32			offset;		/* checksum offset  */
	struct icmp6_filter	filter;
	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
	struct ipv6_pinfo	inet6;
};

struct udp6_sock {
	struct udp_sock	  udp;
	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
	struct ipv6_pinfo inet6;
};

struct tcp6_sock {
	struct tcp_sock	  tcp;
	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
	struct ipv6_pinfo inet6;
};

extern int inet6_sk_rebuild_header(struct sock *sk);

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
{
	return inet_sk(__sk)->pinet6;
}

static inline struct inet6_request_sock *
			inet6_rsk(const struct request_sock *rsk)
{
	return (struct inet6_request_sock *)(((u8 *)rsk) +
					     inet_rsk(rsk)->inet6_rsk_offset);
}

static inline u32 inet6_rsk_offset(struct request_sock *rsk)
{
	return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
}

static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
{
	struct request_sock *req = reqsk_alloc(ops);

	if (req != NULL)
		inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);

	return req;
}

static inline struct raw6_sock *raw6_sk(const struct sock *sk)
{
	return (struct raw6_sock *)sk;
}

static inline void inet_sk_copy_descendant(struct sock *sk_to,
					   const struct sock *sk_from)
{
	int ancestor_size = sizeof(struct inet_sock);

	if (sk_from->sk_family == PF_INET6)
		ancestor_size += sizeof(struct ipv6_pinfo);

	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
}

#define __ipv6_only_sock(sk)	(inet6_sk(sk)->ipv6only)
#define ipv6_only_sock(sk)	((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))

struct inet6_timewait_sock {
	struct in6_addr tw_v6_daddr;
	struct in6_addr	tw_v6_rcv_saddr;
};

struct tcp6_timewait_sock {
	struct tcp_timewait_sock   tcp6tw_tcp;
	struct inet6_timewait_sock tcp6tw_inet6;
};

static inline u16 inet6_tw_offset(const struct proto *prot)
{
	return prot->twsk_prot->twsk_obj_size -
			sizeof(struct inet6_timewait_sock);
}

static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
{
	return (struct inet6_timewait_sock *)(((u8 *)sk) +
					      inet_twsk(sk)->tw_ipv6_offset);
}

static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
{
	return likely(sk->sk_state != TCP_TIME_WAIT) ?
		&inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
}

static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
{
	return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
}

static inline int inet_v6_ipv6only(const struct sock *sk)
{
	return likely(sk->sk_state != TCP_TIME_WAIT) ?
		ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
}
#else
#define __ipv6_only_sock(sk)	0
#define ipv6_only_sock(sk)	0

static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
{
	return NULL;
}

static inline struct inet6_request_sock *
			inet6_rsk(const struct request_sock *rsk)
{
	return NULL;
}

static inline struct raw6_sock *raw6_sk(const struct sock *sk)
{
	return NULL;
}

#define __inet6_rcv_saddr(__sk)	NULL
#define inet6_rcv_saddr(__sk)	NULL
#define tcp_twsk_ipv6only(__sk)		0
#define inet_v6_ipv6only(__sk)		0
#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */

#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
	(((__sk)->sk_hash == (__hash))				&& \
	 ((*((__u32 *)&(inet_sk(__sk)->dport))) == (__ports))  	&& \
	 ((__sk)->sk_family		== AF_INET6)		&& \
	 ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr))	&& \
	 ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr))	&& \
	 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))

#endif /* __KERNEL__ */

#endif /* _IPV6_H */
Commit	Line	Data
	1	#ifndef _IPV6_H
	2	#define _IPV6_H
	3
	4	#include <linux/in6.h>
	5	#include <asm/byteorder.h>
	6
	7	/* The latest drafts declared increase in minimal mtu up to 1280. */
	8
	9	#define IPV6_MIN_MTU 1280
	10
	11	/*
	12	* Advanced API
	13	* source interface/address selection, source routing, etc...
	14	* under construction
	15	*/
	16
	17
	18	struct in6_pktinfo {
	19	struct in6_addr ipi6_addr;
	20	int ipi6_ifindex;
	21	};
	22
	23
	24	struct in6_ifreq {
	25	struct in6_addr ifr6_addr;
	26	__u32 ifr6_prefixlen;
	27	int ifr6_ifindex;
	28	};
	29
	30	#define IPV6_SRCRT_STRICT 0x01 /* this hop must be a neighbor */
	31	#define IPV6_SRCRT_TYPE_0 0 /* IPv6 type 0 Routing Header */
	32
	33	/*
	34	* routing header
	35	*/
	36	struct ipv6_rt_hdr {
	37	__u8 nexthdr;
	38	__u8 hdrlen;
	39	__u8 type;
	40	__u8 segments_left;
	41
	42	/*
	43	* type specific data
	44	* variable length field
	45	*/
	46	};
	47
	48
	49	struct ipv6_opt_hdr {
	50	__u8 nexthdr;
	51	__u8 hdrlen;
	52	/*
	53	* TLV encoded option data follows.
	54	*/
	55	};
	56
	57	#define ipv6_destopt_hdr ipv6_opt_hdr
	58	#define ipv6_hopopt_hdr ipv6_opt_hdr
	59
	60	#ifdef __KERNEL__
	61	#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
	62	#endif
	63
	64	/*
	65	* routing header type 0 (used in cmsghdr struct)
	66	*/
	67
	68	struct rt0_hdr {
	69	struct ipv6_rt_hdr rt_hdr;
	70	__u32 reserved;
	71	struct in6_addr addr[0];
	72
	73	#define rt0_type rt_hdr.type
	74	};
	75
	76	struct ipv6_auth_hdr {
	77	__u8 nexthdr;
	78	__u8 hdrlen; /* This one is measured in 32 bit units! */
	79	__u16 reserved;
	80	__u32 spi;
	81	__u32 seq_no; /* Sequence number */
	82	__u8 auth_data[0]; /* Length variable but >=4. Mind the 64 bit alignment! */
	83	};
	84
	85	struct ipv6_esp_hdr {
	86	__u32 spi;
	87	__u32 seq_no; /* Sequence number */
	88	__u8 enc_data[0]; /* Length variable but >=8. Mind the 64 bit alignment! */
	89	};
	90
	91	struct ipv6_comp_hdr {
	92	__u8 nexthdr;
	93	__u8 flags;
	94	__u16 cpi;
	95	};
	96
	97	/*
	98	* IPv6 fixed header
	99	*
	100	* BEWARE, it is incorrect. The first 4 bits of flow_lbl
	101	* are glued to priority now, forming "class".
	102	*/
	103
	104	struct ipv6hdr {
	105	#if defined(__LITTLE_ENDIAN_BITFIELD)
	106	__u8 priority:4,
	107	version:4;
	108	#elif defined(__BIG_ENDIAN_BITFIELD)
	109	__u8 version:4,
	110	priority:4;
	111	#else
	112	#error "Please fix <asm/byteorder.h>"
	113	#endif
	114	__u8 flow_lbl[3];
	115
	116	__u16 payload_len;
	117	__u8 nexthdr;
	118	__u8 hop_limit;
	119
	120	struct in6_addr saddr;
	121	struct in6_addr daddr;
	122	};
	123
	124	/*
	125	* This structure contains configuration options per IPv6 link.
	126	*/
	127	struct ipv6_devconf {
	128	__s32 forwarding;
	129	__s32 hop_limit;
	130	__s32 mtu6;
	131	__s32 accept_ra;
	132	__s32 accept_redirects;
	133	__s32 autoconf;
	134	__s32 dad_transmits;
	135	__s32 rtr_solicits;
	136	__s32 rtr_solicit_interval;
	137	__s32 rtr_solicit_delay;
	138	__s32 force_mld_version;
	139	#ifdef CONFIG_IPV6_PRIVACY
	140	__s32 use_tempaddr;
	141	__s32 temp_valid_lft;
	142	__s32 temp_prefered_lft;
	143	__s32 regen_max_retry;
	144	__s32 max_desync_factor;
	145	#endif
	146	__s32 max_addresses;
	147	__s32 accept_ra_defrtr;
	148	__s32 accept_ra_pinfo;
	149	#ifdef CONFIG_IPV6_ROUTER_PREF
	150	__s32 accept_ra_rtr_pref;
	151	__s32 rtr_probe_interval;
	152	#ifdef CONFIG_IPV6_ROUTE_INFO
	153	__s32 accept_ra_rt_info_max_plen;
	154	#endif
	155	#endif
	156	void *sysctl;
	157	};
	158
	159	/* index values for the variables in ipv6_devconf */
	160	enum {
	161	DEVCONF_FORWARDING = 0,
	162	DEVCONF_HOPLIMIT,
	163	DEVCONF_MTU6,
	164	DEVCONF_ACCEPT_RA,
	165	DEVCONF_ACCEPT_REDIRECTS,
	166	DEVCONF_AUTOCONF,
	167	DEVCONF_DAD_TRANSMITS,
	168	DEVCONF_RTR_SOLICITS,
	169	DEVCONF_RTR_SOLICIT_INTERVAL,
	170	DEVCONF_RTR_SOLICIT_DELAY,
	171	DEVCONF_USE_TEMPADDR,
	172	DEVCONF_TEMP_VALID_LFT,
	173	DEVCONF_TEMP_PREFERED_LFT,
	174	DEVCONF_REGEN_MAX_RETRY,
	175	DEVCONF_MAX_DESYNC_FACTOR,
	176	DEVCONF_MAX_ADDRESSES,
	177	DEVCONF_FORCE_MLD_VERSION,
	178	DEVCONF_ACCEPT_RA_DEFRTR,
	179	DEVCONF_ACCEPT_RA_PINFO,
	180	DEVCONF_ACCEPT_RA_RTR_PREF,
	181	DEVCONF_RTR_PROBE_INTERVAL,
	182	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
	183	DEVCONF_MAX
	184	};
	185
	186	#ifdef __KERNEL__
	187	#include <linux/icmpv6.h>
	188	#include <linux/tcp.h>
	189	#include <linux/udp.h>
	190
	191	#include <net/if_inet6.h> /* struct ipv6_mc_socklist */
	192	#include <net/inet_sock.h>
	193
	194	/*
	195	This structure contains results of exthdrs parsing
	196	as offsets from skb->nh.
	197	*/
	198
	199	struct inet6_skb_parm {
	200	int iif;
	201	__u16 ra;
	202	__u16 hop;
	203	__u16 dst0;
	204	__u16 srcrt;
	205	__u16 dst1;
	206	__u16 lastopt;
	207	__u32 nhoff;
	208	__u16 flags;
	209
	210	#define IP6SKB_XFRM_TRANSFORMED 1
	211	};
	212
	213	#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
	214
	215	static inline int inet6_iif(const struct sk_buff *skb)
	216	{
	217	return IP6CB(skb)->iif;
	218	}
	219
	220	struct inet6_request_sock {
	221	struct in6_addr loc_addr;
	222	struct in6_addr rmt_addr;
	223	struct sk_buff *pktopts;
	224	int iif;
	225	};
	226
	227	struct tcp6_request_sock {
	228	struct tcp_request_sock tcp6rsk_tcp;
	229	struct inet6_request_sock tcp6rsk_inet6;
	230	};
	231
	232	/**
	233	* struct ipv6_pinfo - ipv6 private area
	234	*
	235	* In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
	236	* this _must_ be the last member, so that inet6_sk_generic
	237	* is able to calculate its offset from the base struct sock
	238	* by using the struct proto->slab_obj_size member. -acme
	239	*/
	240	struct ipv6_pinfo {
	241	struct in6_addr saddr;
	242	struct in6_addr rcv_saddr;
	243	struct in6_addr daddr;
	244	struct in6_addr *daddr_cache;
	245
	246	__u32 flow_label;
	247	__u32 frag_size;
	248	__s16 hop_limit;
	249	__s16 mcast_hops;
	250	int mcast_oif;
	251
	252	/* pktoption flags */
	253	union {
	254	struct {
	255	__u16 srcrt:2,
	256	osrcrt:2,
	257	rxinfo:1,
	258	rxoinfo:1,
	259	rxhlim:1,
	260	rxohlim:1,
	261	hopopts:1,
	262	ohopopts:1,
	263	dstopts:1,
	264	odstopts:1,
	265	rxflow:1,
	266	rxtclass:1;
	267	} bits;
	268	__u16 all;
	269	} rxopt;
	270
	271	/* sockopt flags */
	272	__u8 mc_loop:1,
	273	recverr:1,
	274	sndflow:1,
	275	pmtudisc:2,
	276	ipv6only:1;
	277	__u8 tclass;
	278
	279	__u32 dst_cookie;
	280
	281	struct ipv6_mc_socklist *ipv6_mc_list;
	282	struct ipv6_ac_socklist *ipv6_ac_list;
	283	struct ipv6_fl_socklist *ipv6_fl_list;
	284
	285	struct ipv6_txoptions *opt;
	286	struct sk_buff *pktoptions;
	287	struct {
	288	struct ipv6_txoptions *opt;
	289	struct rt6_info *rt;
	290	int hop_limit;
	291	int tclass;
	292	} cork;
	293	};
	294
	295	/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
	296	struct raw6_sock {
	297	/* inet_sock has to be the first member of raw6_sock */
	298	struct inet_sock inet;
	299	__u32 checksum; /* perform checksum */
	300	__u32 offset; /* checksum offset */
	301	struct icmp6_filter filter;
	302	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
	303	struct ipv6_pinfo inet6;
	304	};
	305
	306	struct udp6_sock {
	307	struct udp_sock udp;
	308	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
	309	struct ipv6_pinfo inet6;
	310	};
	311
	312	struct tcp6_sock {
	313	struct tcp_sock tcp;
	314	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
	315	struct ipv6_pinfo inet6;
	316	};
	317
	318	extern int inet6_sk_rebuild_header(struct sock *sk);
	319
	320	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	321	static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
	322	{
	323	return inet_sk(__sk)->pinet6;
	324	}
	325
	326	static inline struct inet6_request_sock *
	327	inet6_rsk(const struct request_sock *rsk)
	328	{
	329	return (struct inet6_request_sock )(((u8 )rsk) +
	330	inet_rsk(rsk)->inet6_rsk_offset);
	331	}
	332
	333	static inline u32 inet6_rsk_offset(struct request_sock *rsk)
	334	{
	335	return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
	336	}
	337
	338	static inline struct request_sock inet6_reqsk_alloc(struct request_sock_ops ops)
	339	{
	340	struct request_sock *req = reqsk_alloc(ops);
	341
	342	if (req != NULL)
	343	inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
	344
	345	return req;
	346	}
	347
	348	static inline struct raw6_sock raw6_sk(const struct sock sk)
	349	{
	350	return (struct raw6_sock *)sk;
	351	}
	352
	353	static inline void inet_sk_copy_descendant(struct sock *sk_to,
	354	const struct sock *sk_from)
	355	{
	356	int ancestor_size = sizeof(struct inet_sock);
	357
	358	if (sk_from->sk_family == PF_INET6)
	359	ancestor_size += sizeof(struct ipv6_pinfo);
	360
	361	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
	362	}
	363
	364	#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
	365	#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
	366
	367	struct inet6_timewait_sock {
	368	struct in6_addr tw_v6_daddr;
	369	struct in6_addr tw_v6_rcv_saddr;
	370	};
	371
	372	struct tcp6_timewait_sock {
	373	struct tcp_timewait_sock tcp6tw_tcp;
	374	struct inet6_timewait_sock tcp6tw_inet6;
	375	};
	376
	377	static inline u16 inet6_tw_offset(const struct proto *prot)
	378	{
	379	return prot->twsk_prot->twsk_obj_size -
	380	sizeof(struct inet6_timewait_sock);
	381	}
	382
	383	static inline struct inet6_timewait_sock inet6_twsk(const struct sock sk)
	384	{
	385	return (struct inet6_timewait_sock )(((u8 )sk) +
	386	inet_twsk(sk)->tw_ipv6_offset);
	387	}
	388
	389	static inline struct in6_addr __inet6_rcv_saddr(const struct sock sk)
	390	{
	391	return likely(sk->sk_state != TCP_TIME_WAIT) ?
	392	&inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
	393	}
	394
	395	static inline struct in6_addr inet6_rcv_saddr(const struct sock sk)
	396	{
	397	return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
	398	}
	399
	400	static inline int inet_v6_ipv6only(const struct sock *sk)
	401	{
	402	return likely(sk->sk_state != TCP_TIME_WAIT) ?
	403	ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
	404	}
	405	#else
	406	#define __ipv6_only_sock(sk) 0
	407	#define ipv6_only_sock(sk) 0
	408
	409	static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
	410	{
	411	return NULL;
	412	}
	413
	414	static inline struct inet6_request_sock *
	415	inet6_rsk(const struct request_sock *rsk)
	416	{
	417	return NULL;
	418	}
	419
	420	static inline struct raw6_sock raw6_sk(const struct sock sk)
	421	{
	422	return NULL;
	423	}
	424
	425	#define __inet6_rcv_saddr(__sk) NULL
	426	#define inet6_rcv_saddr(__sk) NULL
	427	#define tcp_twsk_ipv6only(__sk) 0
	428	#define inet_v6_ipv6only(__sk) 0
	429	#endif /* defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE) */
	430
	431	#define INET6_MATCH(__sk, __hash, __saddr, __daddr, __ports, __dif)\
	432	(((__sk)->sk_hash == (__hash)) && \
	433	((((__u32 )&(inet_sk(__sk)->dport))) == (__ports)) && \
	434	((__sk)->sk_family == AF_INET6) && \
	435	ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
	436	ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
	437	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	438
	439	#endif /* __KERNEL__ */
	440
	441	#endif /* _IPV6_H */