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

#ifndef _IPV6_H
#define _IPV6_H

#include <linux/types.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	/* Deprecated; will be removed */
#define IPV6_SRCRT_TYPE_0	0	/* Deprecated; will be removed */
#define IPV6_SRCRT_TYPE_2	2	/* IPv6 type 2 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.
	 */
} __attribute__ ((packed));	/* required for some archs */

#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
};

/*
 *	routing header type 2
 */

struct rt2_hdr {
	struct ipv6_rt_hdr	rt_hdr;
	__u32			reserved;
	struct in6_addr		addr;

#define rt2_type		rt_hdr.type
};

/*
 *	home address option in destination options header
 */

struct ipv6_destopt_hao {
	__u8			type;
	__u8			length;
	struct in6_addr		addr;
} __attribute__ ((__packed__));

/*
 *	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];

	__be16			payload_len;
	__u8			nexthdr;
	__u8			hop_limit;

	struct	in6_addr	saddr;
	struct	in6_addr	daddr;
};

#ifdef __KERNEL__
/*
 * 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
	__s32		proxy_ndp;
	__s32		accept_source_route;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	__s32		optimistic_dad;
#endif
#ifdef CONFIG_IPV6_MROUTE
	__s32		mc_forwarding;
#endif
	__s32		disable_ipv6;
	__s32		accept_dad;
	void		*sysctl;
};

struct ipv6_params {
	__s32 disable_ipv6;
	__s32 autoconf;
};
extern struct ipv6_params ipv6_defaults;
#endif

/* 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_PROXY_NDP,
	DEVCONF_OPTIMISTIC_DAD,
	DEVCONF_ACCEPT_SOURCE_ROUTE,
	DEVCONF_MC_FORWARDING,
	DEVCONF_DISABLE_IPV6,
	DEVCONF_ACCEPT_DAD,
	DEVCONF_MAX
};

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

#include <net/inet_sock.h>

static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb)
{
	return (struct ipv6hdr *)skb_network_header(skb);
}

static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb)
{
	return (struct ipv6hdr *)skb_transport_header(skb);
}

/* 
   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;
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
	__u16			dsthao;
#endif

#define IP6SKB_XFRM_TRANSFORMED	1
#define IP6SKB_FORWARDED	2
};

#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_mc_socklist;
struct ipv6_ac_socklist;
struct ipv6_fl_socklist;

/**
 * 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_pktinfo	sticky_pktinfo;
	struct in6_addr		*daddr_cache;
#ifdef CONFIG_IPV6_SUBTREES
	struct in6_addr		*saddr_cache;
#endif

	__be32			flow_label;
	__u32			frag_size;

	/*
	 * Packed in 16bits.
	 * Omit one shift by by putting the signed field at MSB.
	 */
#if defined(__BIG_ENDIAN_BITFIELD)
	__s16			hop_limit:9;
	__u16			__unused_1:7;
#else
	__u16			__unused_1:7;
	__s16			hop_limit:9;
#endif

#if defined(__BIG_ENDIAN_BITFIELD)
	/* Packed in 16bits. */
	__s16			mcast_hops:9;
	__u16			__unused_2:6,
				mc_loop:1;
#else
	__u16			mc_loop:1,
				__unused_2:6;
	__s16			mcast_hops:9;
#endif
	int			mcast_oif;

	/* pktoption flags */
	union {
		struct {
			__u16	srcrt:1,
				osrcrt:1,
			        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			recverr:1,
	                        sndflow:1,
				pmtudisc:2,
				ipv6only:1,
				srcprefs:3;	/* 001: prefer temporary address
						 * 010: prefer public address
						 * 100: prefer care-of address
						 */
	__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;
		u8 hop_limit;
		u8 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);
		inet6_rsk(req)->pktopts = NULL;
	}

	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, __net, __hash, __saddr, __daddr, __ports, __dif)\
	(((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)	&& \
	 ((*((__portpair *)&(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))))

#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
	(((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net)	&& \
	 (*((__portpair *)&(inet_twsk(__sk)->tw_dport)) == (__ports))	&& \
	 ((__sk)->sk_family	       == PF_INET6)			&& \
	 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr)))	&& \
	 (ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_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/types.h>
	5	#include <linux/in6.h>
	6	#include <asm/byteorder.h>
	7
	8	/* The latest drafts declared increase in minimal mtu up to 1280. */
	9
	10	#define IPV6_MIN_MTU 1280
	11
	12	/*
	13	* Advanced API
	14	* source interface/address selection, source routing, etc...
	15	* under construction
	16	*/
	17
	18
	19	struct in6_pktinfo {
	20	struct in6_addr ipi6_addr;
	21	int ipi6_ifindex;
	22	};
	23
	24
	25	struct in6_ifreq {
	26	struct in6_addr ifr6_addr;
	27	__u32 ifr6_prefixlen;
	28	int ifr6_ifindex;
	29	};
	30
	31	#define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */
	32	#define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */
	33	#define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */
	34
	35	/*
	36	* routing header
	37	*/
	38	struct ipv6_rt_hdr {
	39	__u8 nexthdr;
	40	__u8 hdrlen;
	41	__u8 type;
	42	__u8 segments_left;
	43
	44	/*
	45	* type specific data
	46	* variable length field
	47	*/
	48	};
	49
	50
	51	struct ipv6_opt_hdr {
	52	__u8 nexthdr;
	53	__u8 hdrlen;
	54	/*
	55	* TLV encoded option data follows.
	56	*/
	57	} __attribute__ ((packed)); /* required for some archs */
	58
	59	#define ipv6_destopt_hdr ipv6_opt_hdr
	60	#define ipv6_hopopt_hdr ipv6_opt_hdr
	61
	62	#ifdef __KERNEL__
	63	#define ipv6_optlen(p) (((p)->hdrlen+1) << 3)
	64	#endif
	65
	66	/*
	67	* routing header type 0 (used in cmsghdr struct)
	68	*/
	69
	70	struct rt0_hdr {
	71	struct ipv6_rt_hdr rt_hdr;
	72	__u32 reserved;
	73	struct in6_addr addr[0];
	74
	75	#define rt0_type rt_hdr.type
	76	};
	77
	78	/*
	79	* routing header type 2
	80	*/
	81
	82	struct rt2_hdr {
	83	struct ipv6_rt_hdr rt_hdr;
	84	__u32 reserved;
	85	struct in6_addr addr;
	86
	87	#define rt2_type rt_hdr.type
	88	};
	89
	90	/*
	91	* home address option in destination options header
	92	*/
	93
	94	struct ipv6_destopt_hao {
	95	__u8 type;
	96	__u8 length;
	97	struct in6_addr addr;
	98	} __attribute__ ((__packed__));
	99
	100	/*
	101	* IPv6 fixed header
	102	*
	103	* BEWARE, it is incorrect. The first 4 bits of flow_lbl
	104	* are glued to priority now, forming "class".
	105	*/
	106
	107	struct ipv6hdr {
	108	#if defined(__LITTLE_ENDIAN_BITFIELD)
	109	__u8 priority:4,
	110	version:4;
	111	#elif defined(__BIG_ENDIAN_BITFIELD)
	112	__u8 version:4,
	113	priority:4;
	114	#else
	115	#error "Please fix <asm/byteorder.h>"
	116	#endif
	117	__u8 flow_lbl[3];
	118
	119	__be16 payload_len;
	120	__u8 nexthdr;
	121	__u8 hop_limit;
	122
	123	struct in6_addr saddr;
	124	struct in6_addr daddr;
	125	};
	126
	127	#ifdef __KERNEL__
	128	/*
	129	* This structure contains configuration options per IPv6 link.
	130	*/
	131	struct ipv6_devconf {
	132	__s32 forwarding;
	133	__s32 hop_limit;
	134	__s32 mtu6;
	135	__s32 accept_ra;
	136	__s32 accept_redirects;
	137	__s32 autoconf;
	138	__s32 dad_transmits;
	139	__s32 rtr_solicits;
	140	__s32 rtr_solicit_interval;
	141	__s32 rtr_solicit_delay;
	142	__s32 force_mld_version;
	143	#ifdef CONFIG_IPV6_PRIVACY
	144	__s32 use_tempaddr;
	145	__s32 temp_valid_lft;
	146	__s32 temp_prefered_lft;
	147	__s32 regen_max_retry;
	148	__s32 max_desync_factor;
	149	#endif
	150	__s32 max_addresses;
	151	__s32 accept_ra_defrtr;
	152	__s32 accept_ra_pinfo;
	153	#ifdef CONFIG_IPV6_ROUTER_PREF
	154	__s32 accept_ra_rtr_pref;
	155	__s32 rtr_probe_interval;
	156	#ifdef CONFIG_IPV6_ROUTE_INFO
	157	__s32 accept_ra_rt_info_max_plen;
	158	#endif
	159	#endif
	160	__s32 proxy_ndp;
	161	__s32 accept_source_route;
	162	#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
	163	__s32 optimistic_dad;
	164	#endif
	165	#ifdef CONFIG_IPV6_MROUTE
	166	__s32 mc_forwarding;
	167	#endif
	168	__s32 disable_ipv6;
	169	__s32 accept_dad;
	170	void *sysctl;
	171	};
	172
	173	struct ipv6_params {
	174	__s32 disable_ipv6;
	175	__s32 autoconf;
	176	};
	177	extern struct ipv6_params ipv6_defaults;
	178	#endif
	179
	180	/* index values for the variables in ipv6_devconf */
	181	enum {
	182	DEVCONF_FORWARDING = 0,
	183	DEVCONF_HOPLIMIT,
	184	DEVCONF_MTU6,
	185	DEVCONF_ACCEPT_RA,
	186	DEVCONF_ACCEPT_REDIRECTS,
	187	DEVCONF_AUTOCONF,
	188	DEVCONF_DAD_TRANSMITS,
	189	DEVCONF_RTR_SOLICITS,
	190	DEVCONF_RTR_SOLICIT_INTERVAL,
	191	DEVCONF_RTR_SOLICIT_DELAY,
	192	DEVCONF_USE_TEMPADDR,
	193	DEVCONF_TEMP_VALID_LFT,
	194	DEVCONF_TEMP_PREFERED_LFT,
	195	DEVCONF_REGEN_MAX_RETRY,
	196	DEVCONF_MAX_DESYNC_FACTOR,
	197	DEVCONF_MAX_ADDRESSES,
	198	DEVCONF_FORCE_MLD_VERSION,
	199	DEVCONF_ACCEPT_RA_DEFRTR,
	200	DEVCONF_ACCEPT_RA_PINFO,
	201	DEVCONF_ACCEPT_RA_RTR_PREF,
	202	DEVCONF_RTR_PROBE_INTERVAL,
	203	DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
	204	DEVCONF_PROXY_NDP,
	205	DEVCONF_OPTIMISTIC_DAD,
	206	DEVCONF_ACCEPT_SOURCE_ROUTE,
	207	DEVCONF_MC_FORWARDING,
	208	DEVCONF_DISABLE_IPV6,
	209	DEVCONF_ACCEPT_DAD,
	210	DEVCONF_MAX
	211	};
	212
	213	#ifdef __KERNEL__
	214	#include <linux/icmpv6.h>
	215	#include <linux/tcp.h>
	216	#include <linux/udp.h>
	217
	218	#include <net/inet_sock.h>
	219
	220	static inline struct ipv6hdr ipv6_hdr(const struct sk_buff skb)
	221	{
	222	return (struct ipv6hdr *)skb_network_header(skb);
	223	}
	224
	225	static inline struct ipv6hdr ipipv6_hdr(const struct sk_buff skb)
	226	{
	227	return (struct ipv6hdr *)skb_transport_header(skb);
	228	}
	229
	230	/*
	231	This structure contains results of exthdrs parsing
	232	as offsets from skb->nh.
	233	*/
	234
	235	struct inet6_skb_parm {
	236	int iif;
	237	__u16 ra;
	238	__u16 hop;
	239	__u16 dst0;
	240	__u16 srcrt;
	241	__u16 dst1;
	242	__u16 lastopt;
	243	__u32 nhoff;
	244	__u16 flags;
	245	#if defined(CONFIG_IPV6_MIP6) \|\| defined(CONFIG_IPV6_MIP6_MODULE)
	246	__u16 dsthao;
	247	#endif
	248
	249	#define IP6SKB_XFRM_TRANSFORMED 1
	250	#define IP6SKB_FORWARDED 2
	251	};
	252
	253	#define IP6CB(skb) ((struct inet6_skb_parm*)((skb)->cb))
	254
	255	static inline int inet6_iif(const struct sk_buff *skb)
	256	{
	257	return IP6CB(skb)->iif;
	258	}
	259
	260	struct inet6_request_sock {
	261	struct in6_addr loc_addr;
	262	struct in6_addr rmt_addr;
	263	struct sk_buff *pktopts;
	264	int iif;
	265	};
	266
	267	struct tcp6_request_sock {
	268	struct tcp_request_sock tcp6rsk_tcp;
	269	struct inet6_request_sock tcp6rsk_inet6;
	270	};
	271
	272	struct ipv6_mc_socklist;
	273	struct ipv6_ac_socklist;
	274	struct ipv6_fl_socklist;
	275
	276	/**
	277	* struct ipv6_pinfo - ipv6 private area
	278	*
	279	* In the struct sock hierarchy (tcp6_sock, upd6_sock, etc)
	280	* this _must_ be the last member, so that inet6_sk_generic
	281	* is able to calculate its offset from the base struct sock
	282	* by using the struct proto->slab_obj_size member. -acme
	283	*/
	284	struct ipv6_pinfo {
	285	struct in6_addr saddr;
	286	struct in6_addr rcv_saddr;
	287	struct in6_addr daddr;
	288	struct in6_pktinfo sticky_pktinfo;
	289	struct in6_addr *daddr_cache;
	290	#ifdef CONFIG_IPV6_SUBTREES
	291	struct in6_addr *saddr_cache;
	292	#endif
	293
	294	__be32 flow_label;
	295	__u32 frag_size;
	296
	297	/*
	298	* Packed in 16bits.
	299	* Omit one shift by by putting the signed field at MSB.
	300	*/
	301	#if defined(__BIG_ENDIAN_BITFIELD)
	302	__s16 hop_limit:9;
	303	__u16 __unused_1:7;
	304	#else
	305	__u16 __unused_1:7;
	306	__s16 hop_limit:9;
	307	#endif
	308
	309	#if defined(__BIG_ENDIAN_BITFIELD)
	310	/* Packed in 16bits. */
	311	__s16 mcast_hops:9;
	312	__u16 __unused_2:6,
	313	mc_loop:1;
	314	#else
	315	__u16 mc_loop:1,
	316	__unused_2:6;
	317	__s16 mcast_hops:9;
	318	#endif
	319	int mcast_oif;
	320
	321	/* pktoption flags */
	322	union {
	323	struct {
	324	__u16 srcrt:1,
	325	osrcrt:1,
	326	rxinfo:1,
	327	rxoinfo:1,
	328	rxhlim:1,
	329	rxohlim:1,
	330	hopopts:1,
	331	ohopopts:1,
	332	dstopts:1,
	333	odstopts:1,
	334	rxflow:1,
	335	rxtclass:1;
	336	} bits;
	337	__u16 all;
	338	} rxopt;
	339
	340	/* sockopt flags */
	341	__u8 recverr:1,
	342	sndflow:1,
	343	pmtudisc:2,
	344	ipv6only:1,
	345	srcprefs:3; /* 001: prefer temporary address
	346	* 010: prefer public address
	347	* 100: prefer care-of address
	348	*/
	349	__u8 tclass;
	350
	351	__u32 dst_cookie;
	352
	353	struct ipv6_mc_socklist *ipv6_mc_list;
	354	struct ipv6_ac_socklist *ipv6_ac_list;
	355	struct ipv6_fl_socklist *ipv6_fl_list;
	356
	357	struct ipv6_txoptions *opt;
	358	struct sk_buff *pktoptions;
	359	struct {
	360	struct ipv6_txoptions *opt;
	361	u8 hop_limit;
	362	u8 tclass;
	363	} cork;
	364	};
	365
	366	/* WARNING: don't change the layout of the members in {raw,udp,tcp}6_sock! */
	367	struct raw6_sock {
	368	/* inet_sock has to be the first member of raw6_sock */
	369	struct inet_sock inet;
	370	__u32 checksum; /* perform checksum */
	371	__u32 offset; /* checksum offset */
	372	struct icmp6_filter filter;
	373	/* ipv6_pinfo has to be the last member of raw6_sock, see inet6_sk_generic */
	374	struct ipv6_pinfo inet6;
	375	};
	376
	377	struct udp6_sock {
	378	struct udp_sock udp;
	379	/* ipv6_pinfo has to be the last member of udp6_sock, see inet6_sk_generic */
	380	struct ipv6_pinfo inet6;
	381	};
	382
	383	struct tcp6_sock {
	384	struct tcp_sock tcp;
	385	/* ipv6_pinfo has to be the last member of tcp6_sock, see inet6_sk_generic */
	386	struct ipv6_pinfo inet6;
	387	};
	388
	389	extern int inet6_sk_rebuild_header(struct sock *sk);
	390
	391	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	392	static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
	393	{
	394	return inet_sk(__sk)->pinet6;
	395	}
	396
	397	static inline struct inet6_request_sock *
	398	inet6_rsk(const struct request_sock *rsk)
	399	{
	400	return (struct inet6_request_sock )(((u8 )rsk) +
	401	inet_rsk(rsk)->inet6_rsk_offset);
	402	}
	403
	404	static inline u32 inet6_rsk_offset(struct request_sock *rsk)
	405	{
	406	return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
	407	}
	408
	409	static inline struct request_sock inet6_reqsk_alloc(struct request_sock_ops ops)
	410	{
	411	struct request_sock *req = reqsk_alloc(ops);
	412
	413	if (req != NULL) {
	414	inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
	415	inet6_rsk(req)->pktopts = NULL;
	416	}
	417
	418	return req;
	419	}
	420
	421	static inline struct raw6_sock raw6_sk(const struct sock sk)
	422	{
	423	return (struct raw6_sock *)sk;
	424	}
	425
	426	static inline void inet_sk_copy_descendant(struct sock *sk_to,
	427	const struct sock *sk_from)
	428	{
	429	int ancestor_size = sizeof(struct inet_sock);
	430
	431	if (sk_from->sk_family == PF_INET6)
	432	ancestor_size += sizeof(struct ipv6_pinfo);
	433
	434	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
	435	}
	436
	437	#define __ipv6_only_sock(sk) (inet6_sk(sk)->ipv6only)
	438	#define ipv6_only_sock(sk) ((sk)->sk_family == PF_INET6 && __ipv6_only_sock(sk))
	439
	440	struct inet6_timewait_sock {
	441	struct in6_addr tw_v6_daddr;
	442	struct in6_addr tw_v6_rcv_saddr;
	443	};
	444
	445	struct tcp6_timewait_sock {
	446	struct tcp_timewait_sock tcp6tw_tcp;
	447	struct inet6_timewait_sock tcp6tw_inet6;
	448	};
	449
	450	static inline u16 inet6_tw_offset(const struct proto *prot)
	451	{
	452	return prot->twsk_prot->twsk_obj_size -
	453	sizeof(struct inet6_timewait_sock);
	454	}
	455
	456	static inline struct inet6_timewait_sock inet6_twsk(const struct sock sk)
	457	{
	458	return (struct inet6_timewait_sock )(((u8 )sk) +
	459	inet_twsk(sk)->tw_ipv6_offset);
	460	}
	461
	462	static inline struct in6_addr __inet6_rcv_saddr(const struct sock sk)
	463	{
	464	return likely(sk->sk_state != TCP_TIME_WAIT) ?
	465	&inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
	466	}
	467
	468	static inline struct in6_addr inet6_rcv_saddr(const struct sock sk)
	469	{
	470	return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
	471	}
	472
	473	static inline int inet_v6_ipv6only(const struct sock *sk)
	474	{
	475	return likely(sk->sk_state != TCP_TIME_WAIT) ?
	476	ipv6_only_sock(sk) : inet_twsk(sk)->tw_ipv6only;
	477	}
	478	#else
	479	#define __ipv6_only_sock(sk) 0
	480	#define ipv6_only_sock(sk) 0
	481
	482	static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
	483	{
	484	return NULL;
	485	}
	486
	487	static inline struct inet6_request_sock *
	488	inet6_rsk(const struct request_sock *rsk)
	489	{
	490	return NULL;
	491	}
	492
	493	static inline struct raw6_sock raw6_sk(const struct sock sk)
	494	{
	495	return NULL;
	496	}
	497
	498	#define __inet6_rcv_saddr(__sk) NULL
	499	#define inet6_rcv_saddr(__sk) NULL
	500	#define tcp_twsk_ipv6only(__sk) 0
	501	#define inet_v6_ipv6only(__sk) 0
	502	#endif /* defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE) */
	503
	504	#define INET6_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif)\
	505	(((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
	506	((((__portpair )&(inet_sk(__sk)->dport))) == (__ports)) && \
	507	((__sk)->sk_family == AF_INET6) && \
	508	ipv6_addr_equal(&inet6_sk(__sk)->daddr, (__saddr)) && \
	509	ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
	510	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	511
	512	#define INET6_TW_MATCH(__sk, __net, __hash, __saddr, __daddr, __ports, __dif) \
	513	(((__sk)->sk_hash == (__hash)) && sock_net((__sk)) == (__net) && \
	514	(((__portpair )&(inet_twsk(__sk)->tw_dport)) == (__ports)) && \
	515	((__sk)->sk_family == PF_INET6) && \
	516	(ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_daddr, (__saddr))) && \
	517	(ipv6_addr_equal(&inet6_twsk(__sk)->tw_v6_rcv_saddr, (__daddr))) && \
	518	(!((__sk)->sk_bound_dev_if) \|\| ((__sk)->sk_bound_dev_if == (__dif))))
	519
	520	#endif /* __KERNEL__ */
	521
	522	#endif /* _IPV6_H */