Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 1809 insertions, 0 deletions

diff --git a/kernel/include/net/xfrm.h b/kernel/include/net/xfrm.h
new file mode 100644
index 000000000..36ac102c9
--- /dev/null
+++ b/kernel/include/net/xfrm.h
@@ -0,0 +1,1809 @@
+#ifndef _NET_XFRM_H
+#define _NET_XFRM_H
+
+#include <linux/compiler.h>
+#include <linux/xfrm.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/pfkeyv2.h>
+#include <linux/ipsec.h>
+#include <linux/in6.h>
+#include <linux/mutex.h>
+#include <linux/audit.h>
+#include <linux/slab.h>
+
+#include <net/sock.h>
+#include <net/dst.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/flow.h>
+
+#include <linux/interrupt.h>
+
+#ifdef CONFIG_XFRM_STATISTICS
+#include <net/snmp.h>
+#endif
+
+#define XFRM_PROTO_ESP		50
+#define XFRM_PROTO_AH		51
+#define XFRM_PROTO_COMP		108
+#define XFRM_PROTO_IPIP		4
+#define XFRM_PROTO_IPV6		41
+#define XFRM_PROTO_ROUTING	IPPROTO_ROUTING
+#define XFRM_PROTO_DSTOPTS	IPPROTO_DSTOPTS
+
+#define XFRM_ALIGN4(len)	(((len) + 3) & ~3)
+#define XFRM_ALIGN8(len)	(((len) + 7) & ~7)
+#define MODULE_ALIAS_XFRM_MODE(family, encap) \
+	MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
+#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
+	MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
+
+#ifdef CONFIG_XFRM_STATISTICS
+#define XFRM_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
+#define XFRM_INC_STATS_BH(net, field)	SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
+#define XFRM_INC_STATS_USER(net, field)	SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
+#else
+#define XFRM_INC_STATS(net, field)	((void)(net))
+#define XFRM_INC_STATS_BH(net, field)	((void)(net))
+#define XFRM_INC_STATS_USER(net, field)	((void)(net))
+#endif
+
+
+/* Organization of SPD aka "XFRM rules"
+   ------------------------------------
+
+   Basic objects:
+   - policy rule, struct xfrm_policy (=SPD entry)
+   - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
+   - instance of a transformer, struct xfrm_state (=SA)
+   - template to clone xfrm_state, struct xfrm_tmpl
+
+   SPD is plain linear list of xfrm_policy rules, ordered by priority.
+   (To be compatible with existing pfkeyv2 implementations,
+   many rules with priority of 0x7fffffff are allowed to exist and
+   such rules are ordered in an unpredictable way, thanks to bsd folks.)
+
+   Lookup is plain linear search until the first match with selector.
+
+   If "action" is "block", then we prohibit the flow, otherwise:
+   if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
+   policy entry has list of up to XFRM_MAX_DEPTH transformations,
+   described by templates xfrm_tmpl. Each template is resolved
+   to a complete xfrm_state (see below) and we pack bundle of transformations
+   to a dst_entry returned to requestor.
+
+   dst -. xfrm  .-> xfrm_state #1
+    |---. child .-> dst -. xfrm .-> xfrm_state #2
+                     |---. child .-> dst -. xfrm .-> xfrm_state #3
+                                      |---. child .-> NULL
+
+   Bundles are cached at xrfm_policy struct (field ->bundles).
+
+
+   Resolution of xrfm_tmpl
+   -----------------------
+   Template contains:
+   1. ->mode		Mode: transport or tunnel
+   2. ->id.proto	Protocol: AH/ESP/IPCOMP
+   3. ->id.daddr	Remote tunnel endpoint, ignored for transport mode.
+      Q: allow to resolve security gateway?
+   4. ->id.spi          If not zero, static SPI.
+   5. ->saddr		Local tunnel endpoint, ignored for transport mode.
+   6. ->algos		List of allowed algos. Plain bitmask now.
+      Q: ealgos, aalgos, calgos. What a mess...
+   7. ->share		Sharing mode.
+      Q: how to implement private sharing mode? To add struct sock* to
+      flow id?
+
+   Having this template we search through SAD searching for entries
+   with appropriate mode/proto/algo, permitted by selector.
+   If no appropriate entry found, it is requested from key manager.
+
+   PROBLEMS:
+   Q: How to find all the bundles referring to a physical path for
+      PMTU discovery? Seems, dst should contain list of all parents...
+      and enter to infinite locking hierarchy disaster.
+      No! It is easier, we will not search for them, let them find us.
+      We add genid to each dst plus pointer to genid of raw IP route,
+      pmtu disc will update pmtu on raw IP route and increase its genid.
+      dst_check() will see this for top level and trigger resyncing
+      metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
+ */
+
+struct xfrm_state_walk {
+	struct list_head	all;
+	u8			state;
+	u8			dying;
+	u8			proto;
+	u32			seq;
+	struct xfrm_address_filter *filter;
+};
+
+/* Full description of state of transformer. */
+struct xfrm_state {
+	possible_net_t		xs_net;
+	union {
+		struct hlist_node	gclist;
+		struct hlist_node	bydst;
+	};
+	struct hlist_node	bysrc;
+	struct hlist_node	byspi;
+
+	atomic_t		refcnt;
+	spinlock_t		lock;
+
+	struct xfrm_id		id;
+	struct xfrm_selector	sel;
+	struct xfrm_mark	mark;
+	u32			tfcpad;
+
+	u32			genid;
+
+	/* Key manager bits */
+	struct xfrm_state_walk	km;
+
+	/* Parameters of this state. */
+	struct {
+		u32		reqid;
+		u8		mode;
+		u8		replay_window;
+		u8		aalgo, ealgo, calgo;
+		u8		flags;
+		u16		family;
+		xfrm_address_t	saddr;
+		int		header_len;
+		int		trailer_len;
+		u32		extra_flags;
+	} props;
+
+	struct xfrm_lifetime_cfg lft;
+
+	/* Data for transformer */
+	struct xfrm_algo_auth	*aalg;
+	struct xfrm_algo	*ealg;
+	struct xfrm_algo	*calg;
+	struct xfrm_algo_aead	*aead;
+
+	/* Data for encapsulator */
+	struct xfrm_encap_tmpl	*encap;
+
+	/* Data for care-of address */
+	xfrm_address_t	*coaddr;
+
+	/* IPComp needs an IPIP tunnel for handling uncompressed packets */
+	struct xfrm_state	*tunnel;
+
+	/* If a tunnel, number of users + 1 */
+	atomic_t		tunnel_users;
+
+	/* State for replay detection */
+	struct xfrm_replay_state replay;
+	struct xfrm_replay_state_esn *replay_esn;
+
+	/* Replay detection state at the time we sent the last notification */
+	struct xfrm_replay_state preplay;
+	struct xfrm_replay_state_esn *preplay_esn;
+
+	/* The functions for replay detection. */
+	struct xfrm_replay	*repl;
+
+	/* internal flag that only holds state for delayed aevent at the
+	 * moment
+	*/
+	u32			xflags;
+
+	/* Replay detection notification settings */
+	u32			replay_maxage;
+	u32			replay_maxdiff;
+
+	/* Replay detection notification timer */
+	struct timer_list	rtimer;
+
+	/* Statistics */
+	struct xfrm_stats	stats;
+
+	struct xfrm_lifetime_cur curlft;
+	struct tasklet_hrtimer	mtimer;
+
+	/* used to fix curlft->add_time when changing date */
+	long		saved_tmo;
+
+	/* Last used time */
+	unsigned long		lastused;
+
+	/* Reference to data common to all the instances of this
+	 * transformer. */
+	const struct xfrm_type	*type;
+	struct xfrm_mode	*inner_mode;
+	struct xfrm_mode	*inner_mode_iaf;
+	struct xfrm_mode	*outer_mode;
+
+	/* Security context */
+	struct xfrm_sec_ctx	*security;
+
+	/* Private data of this transformer, format is opaque,
+	 * interpreted by xfrm_type methods. */
+	void			*data;
+};
+
+static inline struct net *xs_net(struct xfrm_state *x)
+{
+	return read_pnet(&x->xs_net);
+}
+
+/* xflags - make enum if more show up */
+#define XFRM_TIME_DEFER	1
+#define XFRM_SOFT_EXPIRE 2
+
+enum {
+	XFRM_STATE_VOID,
+	XFRM_STATE_ACQ,
+	XFRM_STATE_VALID,
+	XFRM_STATE_ERROR,
+	XFRM_STATE_EXPIRED,
+	XFRM_STATE_DEAD
+};
+
+/* callback structure passed from either netlink or pfkey */
+struct km_event {
+	union {
+		u32 hard;
+		u32 proto;
+		u32 byid;
+		u32 aevent;
+		u32 type;
+	} data;
+
+	u32	seq;
+	u32	portid;
+	u32	event;
+	struct net *net;
+};
+
+struct xfrm_replay {
+	void	(*advance)(struct xfrm_state *x, __be32 net_seq);
+	int	(*check)(struct xfrm_state *x,
+			 struct sk_buff *skb,
+			 __be32 net_seq);
+	int	(*recheck)(struct xfrm_state *x,
+			   struct sk_buff *skb,
+			   __be32 net_seq);
+	void	(*notify)(struct xfrm_state *x, int event);
+	int	(*overflow)(struct xfrm_state *x, struct sk_buff *skb);
+};
+
+struct net_device;
+struct xfrm_type;
+struct xfrm_dst;
+struct xfrm_policy_afinfo {
+	unsigned short		family;
+	struct dst_ops		*dst_ops;
+	void			(*garbage_collect)(struct net *net);
+	struct dst_entry	*(*dst_lookup)(struct net *net, int tos,
+					       const xfrm_address_t *saddr,
+					       const xfrm_address_t *daddr);
+	int			(*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
+	void			(*decode_session)(struct sk_buff *skb,
+						  struct flowi *fl,
+						  int reverse);
+	int			(*get_tos)(const struct flowi *fl);
+	void			(*init_dst)(struct net *net,
+					    struct xfrm_dst *dst);
+	int			(*init_path)(struct xfrm_dst *path,
+					     struct dst_entry *dst,
+					     int nfheader_len);
+	int			(*fill_dst)(struct xfrm_dst *xdst,
+					    struct net_device *dev,
+					    const struct flowi *fl);
+	struct dst_entry	*(*blackhole_route)(struct net *net, struct dst_entry *orig);
+};
+
+int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
+int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
+void km_policy_notify(struct xfrm_policy *xp, int dir,
+		      const struct km_event *c);
+void km_state_notify(struct xfrm_state *x, const struct km_event *c);
+
+struct xfrm_tmpl;
+int km_query(struct xfrm_state *x, struct xfrm_tmpl *t,
+	     struct xfrm_policy *pol);
+void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
+int __xfrm_state_delete(struct xfrm_state *x);
+
+struct xfrm_state_afinfo {
+	unsigned int		family;
+	unsigned int		proto;
+	__be16			eth_proto;
+	struct module		*owner;
+	const struct xfrm_type	*type_map[IPPROTO_MAX];
+	struct xfrm_mode	*mode_map[XFRM_MODE_MAX];
+	int			(*init_flags)(struct xfrm_state *x);
+	void			(*init_tempsel)(struct xfrm_selector *sel,
+						const struct flowi *fl);
+	void			(*init_temprop)(struct xfrm_state *x,
+						const struct xfrm_tmpl *tmpl,
+						const xfrm_address_t *daddr,
+						const xfrm_address_t *saddr);
+	int			(*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
+	int			(*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
+	int			(*output)(struct sock *sk, struct sk_buff *skb);
+	int			(*output_finish)(struct sock *sk, struct sk_buff *skb);
+	int			(*extract_input)(struct xfrm_state *x,
+						 struct sk_buff *skb);
+	int			(*extract_output)(struct xfrm_state *x,
+						  struct sk_buff *skb);
+	int			(*transport_finish)(struct sk_buff *skb,
+						    int async);
+	void			(*local_error)(struct sk_buff *skb, u32 mtu);
+};
+
+int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
+int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
+struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
+void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
+
+struct xfrm_input_afinfo {
+	unsigned int		family;
+	struct module		*owner;
+	int			(*callback)(struct sk_buff *skb, u8 protocol,
+					    int err);
+};
+
+int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo);
+int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo);
+
+void xfrm_state_delete_tunnel(struct xfrm_state *x);
+
+struct xfrm_type {
+	char			*description;
+	struct module		*owner;
+	u8			proto;
+	u8			flags;
+#define XFRM_TYPE_NON_FRAGMENT	1
+#define XFRM_TYPE_REPLAY_PROT	2
+#define XFRM_TYPE_LOCAL_COADDR	4
+#define XFRM_TYPE_REMOTE_COADDR	8
+
+	int			(*init_state)(struct xfrm_state *x);
+	void			(*destructor)(struct xfrm_state *);
+	int			(*input)(struct xfrm_state *, struct sk_buff *skb);
+	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
+	int			(*reject)(struct xfrm_state *, struct sk_buff *,
+					  const struct flowi *);
+	int			(*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
+	/* Estimate maximal size of result of transformation of a dgram */
+	u32			(*get_mtu)(struct xfrm_state *, int size);
+};
+
+int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
+int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
+
+struct xfrm_mode {
+	/*
+	 * Remove encapsulation header.
+	 *
+	 * The IP header will be moved over the top of the encapsulation
+	 * header.
+	 *
+	 * On entry, the transport header shall point to where the IP header
+	 * should be and the network header shall be set to where the IP
+	 * header currently is.  skb->data shall point to the start of the
+	 * payload.
+	 */
+	int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
+
+	/*
+	 * This is the actual input entry point.
+	 *
+	 * For transport mode and equivalent this would be identical to
+	 * input2 (which does not need to be set).  While tunnel mode
+	 * and equivalent would set this to the tunnel encapsulation function
+	 * xfrm4_prepare_input that would in turn call input2.
+	 */
+	int (*input)(struct xfrm_state *x, struct sk_buff *skb);
+
+	/*
+	 * Add encapsulation header.
+	 *
+	 * On exit, the transport header will be set to the start of the
+	 * encapsulation header to be filled in by x->type->output and
+	 * the mac header will be set to the nextheader (protocol for
+	 * IPv4) field of the extension header directly preceding the
+	 * encapsulation header, or in its absence, that of the top IP
+	 * header.  The value of the network header will always point
+	 * to the top IP header while skb->data will point to the payload.
+	 */
+	int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
+
+	/*
+	 * This is the actual output entry point.
+	 *
+	 * For transport mode and equivalent this would be identical to
+	 * output2 (which does not need to be set).  While tunnel mode
+	 * and equivalent would set this to a tunnel encapsulation function
+	 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
+	 * call output2.
+	 */
+	int (*output)(struct xfrm_state *x, struct sk_buff *skb);
+
+	struct xfrm_state_afinfo *afinfo;
+	struct module *owner;
+	unsigned int encap;
+	int flags;
+};
+
+/* Flags for xfrm_mode. */
+enum {
+	XFRM_MODE_FLAG_TUNNEL = 1,
+};
+
+int xfrm_register_mode(struct xfrm_mode *mode, int family);
+int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
+
+static inline int xfrm_af2proto(unsigned int family)
+{
+	switch(family) {
+	case AF_INET:
+		return IPPROTO_IPIP;
+	case AF_INET6:
+		return IPPROTO_IPV6;
+	default:
+		return 0;
+	}
+}
+
+static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
+{
+	if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
+	    (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
+		return x->inner_mode;
+	else
+		return x->inner_mode_iaf;
+}
+
+struct xfrm_tmpl {
+/* id in template is interpreted as:
+ * daddr - destination of tunnel, may be zero for transport mode.
+ * spi   - zero to acquire spi. Not zero if spi is static, then
+ *	   daddr must be fixed too.
+ * proto - AH/ESP/IPCOMP
+ */
+	struct xfrm_id		id;
+
+/* Source address of tunnel. Ignored, if it is not a tunnel. */
+	xfrm_address_t		saddr;
+
+	unsigned short		encap_family;
+
+	u32			reqid;
+
+/* Mode: transport, tunnel etc. */
+	u8			mode;
+
+/* Sharing mode: unique, this session only, this user only etc. */
+	u8			share;
+
+/* May skip this transfomration if no SA is found */
+	u8			optional;
+
+/* Skip aalgos/ealgos/calgos checks. */
+	u8			allalgs;
+
+/* Bit mask of algos allowed for acquisition */
+	u32			aalgos;
+	u32			ealgos;
+	u32			calgos;
+};
+
+#define XFRM_MAX_DEPTH		6
+
+struct xfrm_policy_walk_entry {
+	struct list_head	all;
+	u8			dead;
+};
+
+struct xfrm_policy_walk {
+	struct xfrm_policy_walk_entry walk;
+	u8 type;
+	u32 seq;
+};
+
+struct xfrm_policy_queue {
+	struct sk_buff_head	hold_queue;
+	struct timer_list	hold_timer;
+	unsigned long		timeout;
+};
+
+struct xfrm_policy {
+	possible_net_t		xp_net;
+	struct hlist_node	bydst;
+	struct hlist_node	byidx;
+
+	/* This lock only affects elements except for entry. */
+	rwlock_t		lock;
+	atomic_t		refcnt;
+	struct timer_list	timer;
+
+	struct flow_cache_object flo;
+	atomic_t		genid;
+	u32			priority;
+	u32			index;
+	struct xfrm_mark	mark;
+	struct xfrm_selector	selector;
+	struct xfrm_lifetime_cfg lft;
+	struct xfrm_lifetime_cur curlft;
+	struct xfrm_policy_walk_entry walk;
+	struct xfrm_policy_queue polq;
+	u8			type;
+	u8			action;
+	u8			flags;
+	u8			xfrm_nr;
+	u16			family;
+	struct xfrm_sec_ctx	*security;
+	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
+};
+
+static inline struct net *xp_net(const struct xfrm_policy *xp)
+{
+	return read_pnet(&xp->xp_net);
+}
+
+struct xfrm_kmaddress {
+	xfrm_address_t          local;
+	xfrm_address_t          remote;
+	u32			reserved;
+	u16			family;
+};
+
+struct xfrm_migrate {
+	xfrm_address_t		old_daddr;
+	xfrm_address_t		old_saddr;
+	xfrm_address_t		new_daddr;
+	xfrm_address_t		new_saddr;
+	u8			proto;
+	u8			mode;
+	u16			reserved;
+	u32			reqid;
+	u16			old_family;
+	u16			new_family;
+};
+
+#define XFRM_KM_TIMEOUT                30
+/* what happened */
+#define XFRM_REPLAY_UPDATE	XFRM_AE_CR
+#define XFRM_REPLAY_TIMEOUT	XFRM_AE_CE
+
+/* default aevent timeout in units of 100ms */
+#define XFRM_AE_ETIME			10
+/* Async Event timer multiplier */
+#define XFRM_AE_ETH_M			10
+/* default seq threshold size */
+#define XFRM_AE_SEQT_SIZE		2
+
+struct xfrm_mgr {
+	struct list_head	list;
+	char			*id;
+	int			(*notify)(struct xfrm_state *x, const struct km_event *c);
+	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp);
+	struct xfrm_policy	*(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
+	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
+	int			(*notify_policy)(struct xfrm_policy *x, int dir, const struct km_event *c);
+	int			(*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
+	int			(*migrate)(const struct xfrm_selector *sel,
+					   u8 dir, u8 type,
+					   const struct xfrm_migrate *m,
+					   int num_bundles,
+					   const struct xfrm_kmaddress *k);
+	bool			(*is_alive)(const struct km_event *c);
+};
+
+int xfrm_register_km(struct xfrm_mgr *km);
+int xfrm_unregister_km(struct xfrm_mgr *km);
+
+struct xfrm_tunnel_skb_cb {
+	union {
+		struct inet_skb_parm h4;
+		struct inet6_skb_parm h6;
+	} header;
+
+	union {
+		struct ip_tunnel *ip4;
+		struct ip6_tnl *ip6;
+	} tunnel;
+};
+
+#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
+
+/*
+ * This structure is used for the duration where packets are being
+ * transformed by IPsec.  As soon as the packet leaves IPsec the
+ * area beyond the generic IP part may be overwritten.
+ */
+struct xfrm_skb_cb {
+	struct xfrm_tunnel_skb_cb header;
+
+        /* Sequence number for replay protection. */
+	union {
+		struct {
+			__u32 low;
+			__u32 hi;
+		} output;
+		struct {
+			__be32 low;
+			__be32 hi;
+		} input;
+	} seq;
+};
+
+#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
+
+/*
+ * This structure is used by the afinfo prepare_input/prepare_output functions
+ * to transmit header information to the mode input/output functions.
+ */
+struct xfrm_mode_skb_cb {
+	struct xfrm_tunnel_skb_cb header;
+
+	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
+	__be16 id;
+	__be16 frag_off;
+
+	/* IP header length (excluding options or extension headers). */
+	u8 ihl;
+
+	/* TOS for IPv4, class for IPv6. */
+	u8 tos;
+
+	/* TTL for IPv4, hop limitfor IPv6. */
+	u8 ttl;
+
+	/* Protocol for IPv4, NH for IPv6. */
+	u8 protocol;
+
+	/* Option length for IPv4, zero for IPv6. */
+	u8 optlen;
+
+	/* Used by IPv6 only, zero for IPv4. */
+	u8 flow_lbl[3];
+};
+
+#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
+
+/*
+ * This structure is used by the input processing to locate the SPI and
+ * related information.
+ */
+struct xfrm_spi_skb_cb {
+	struct xfrm_tunnel_skb_cb header;
+
+	unsigned int daddroff;
+	unsigned int family;
+};
+
+#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
+
+#ifdef CONFIG_AUDITSYSCALL
+static inline struct audit_buffer *xfrm_audit_start(const char *op)
+{
+	struct audit_buffer *audit_buf = NULL;
+
+	if (audit_enabled == 0)
+		return NULL;
+	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
+				    AUDIT_MAC_IPSEC_EVENT);
+	if (audit_buf == NULL)
+		return NULL;
+	audit_log_format(audit_buf, "op=%s", op);
+	return audit_buf;
+}
+
+static inline void xfrm_audit_helper_usrinfo(bool task_valid,
+					     struct audit_buffer *audit_buf)
+{
+	const unsigned int auid = from_kuid(&init_user_ns, task_valid ?
+					    audit_get_loginuid(current) :
+					    INVALID_UID);
+	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
+		(unsigned int) -1;
+
+	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
+	audit_log_task_context(audit_buf);
+}
+
+void xfrm_audit_policy_add(struct xfrm_policy *xp, int result, bool task_valid);
+void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
+			      bool task_valid);
+void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid);
+void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid);
+void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
+				      struct sk_buff *skb);
+void xfrm_audit_state_replay(struct xfrm_state *x, struct sk_buff *skb,
+			     __be32 net_seq);
+void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
+void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family, __be32 net_spi,
+			       __be32 net_seq);
+void xfrm_audit_state_icvfail(struct xfrm_state *x, struct sk_buff *skb,
+			      u8 proto);
+#else
+
+static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
+					 bool task_valid)
+{
+}
+
+static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
+					    bool task_valid)
+{
+}
+
+static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
+					bool task_valid)
+{
+}
+
+static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
+					   bool task_valid)
+{
+}
+
+static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
+					     struct sk_buff *skb)
+{
+}
+
+static inline void xfrm_audit_state_replay(struct xfrm_state *x,
+					   struct sk_buff *skb, __be32 net_seq)
+{
+}
+
+static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
+				      u16 family)
+{
+}
+
+static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
+				      __be32 net_spi, __be32 net_seq)
+{
+}
+
+static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
+				     struct sk_buff *skb, u8 proto)
+{
+}
+#endif /* CONFIG_AUDITSYSCALL */
+
+static inline void xfrm_pol_hold(struct xfrm_policy *policy)
+{
+	if (likely(policy != NULL))
+		atomic_inc(&policy->refcnt);
+}
+
+void xfrm_policy_destroy(struct xfrm_policy *policy);
+
+static inline void xfrm_pol_put(struct xfrm_policy *policy)
+{
+	if (atomic_dec_and_test(&policy->refcnt))
+		xfrm_policy_destroy(policy);
+}
+
+static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
+{
+	int i;
+	for (i = npols - 1; i >= 0; --i)
+		xfrm_pol_put(pols[i]);
+}
+
+void __xfrm_state_destroy(struct xfrm_state *);
+
+static inline void __xfrm_state_put(struct xfrm_state *x)
+{
+	atomic_dec(&x->refcnt);
+}
+
+static inline void xfrm_state_put(struct xfrm_state *x)
+{
+	if (atomic_dec_and_test(&x->refcnt))
+		__xfrm_state_destroy(x);
+}
+
+static inline void xfrm_state_hold(struct xfrm_state *x)
+{
+	atomic_inc(&x->refcnt);
+}
+
+static inline bool addr_match(const void *token1, const void *token2,
+			      int prefixlen)
+{
+	const __be32 *a1 = token1;
+	const __be32 *a2 = token2;
+	int pdw;
+	int pbi;
+
+	pdw = prefixlen >> 5;	  /* num of whole u32 in prefix */
+	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
+
+	if (pdw)
+		if (memcmp(a1, a2, pdw << 2))
+			return false;
+
+	if (pbi) {
+		__be32 mask;
+
+		mask = htonl((0xffffffff) << (32 - pbi));
+
+		if ((a1[pdw] ^ a2[pdw]) & mask)
+			return false;
+	}
+
+	return true;
+}
+
+static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
+{
+	/* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
+	if (prefixlen == 0)
+		return true;
+	return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
+}
+
+static __inline__
+__be16 xfrm_flowi_sport(const struct flowi *fl, const union flowi_uli *uli)
+{
+	__be16 port;
+	switch(fl->flowi_proto) {
+	case IPPROTO_TCP:
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+	case IPPROTO_SCTP:
+		port = uli->ports.sport;
+		break;
+	case IPPROTO_ICMP:
+	case IPPROTO_ICMPV6:
+		port = htons(uli->icmpt.type);
+		break;
+	case IPPROTO_MH:
+		port = htons(uli->mht.type);
+		break;
+	case IPPROTO_GRE:
+		port = htons(ntohl(uli->gre_key) >> 16);
+		break;
+	default:
+		port = 0;	/*XXX*/
+	}
+	return port;
+}
+
+static __inline__
+__be16 xfrm_flowi_dport(const struct flowi *fl, const union flowi_uli *uli)
+{
+	__be16 port;
+	switch(fl->flowi_proto) {
+	case IPPROTO_TCP:
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+	case IPPROTO_SCTP:
+		port = uli->ports.dport;
+		break;
+	case IPPROTO_ICMP:
+	case IPPROTO_ICMPV6:
+		port = htons(uli->icmpt.code);
+		break;
+	case IPPROTO_GRE:
+		port = htons(ntohl(uli->gre_key) & 0xffff);
+		break;
+	default:
+		port = 0;	/*XXX*/
+	}
+	return port;
+}
+
+bool xfrm_selector_match(const struct xfrm_selector *sel,
+			 const struct flowi *fl, unsigned short family);
+
+#ifdef CONFIG_SECURITY_NETWORK_XFRM
+/*	If neither has a context --> match
+ * 	Otherwise, both must have a context and the sids, doi, alg must match
+ */
+static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
+{
+	return ((!s1 && !s2) ||
+		(s1 && s2 &&
+		 (s1->ctx_sid == s2->ctx_sid) &&
+		 (s1->ctx_doi == s2->ctx_doi) &&
+		 (s1->ctx_alg == s2->ctx_alg)));
+}
+#else
+static inline bool xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
+{
+	return true;
+}
+#endif
+
+/* A struct encoding bundle of transformations to apply to some set of flow.
+ *
+ * dst->child points to the next element of bundle.
+ * dst->xfrm  points to an instanse of transformer.
+ *
+ * Due to unfortunate limitations of current routing cache, which we
+ * have no time to fix, it mirrors struct rtable and bound to the same
+ * routing key, including saddr,daddr. However, we can have many of
+ * bundles differing by session id. All the bundles grow from a parent
+ * policy rule.
+ */
+struct xfrm_dst {
+	union {
+		struct dst_entry	dst;
+		struct rtable		rt;
+		struct rt6_info		rt6;
+	} u;
+	struct dst_entry *route;
+	struct flow_cache_object flo;
+	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
+	int num_pols, num_xfrms;
+#ifdef CONFIG_XFRM_SUB_POLICY
+	struct flowi *origin;
+	struct xfrm_selector *partner;
+#endif
+	u32 xfrm_genid;
+	u32 policy_genid;
+	u32 route_mtu_cached;
+	u32 child_mtu_cached;
+	u32 route_cookie;
+	u32 path_cookie;
+};
+
+#ifdef CONFIG_XFRM
+static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
+{
+	xfrm_pols_put(xdst->pols, xdst->num_pols);
+	dst_release(xdst->route);
+	if (likely(xdst->u.dst.xfrm))
+		xfrm_state_put(xdst->u.dst.xfrm);
+#ifdef CONFIG_XFRM_SUB_POLICY
+	kfree(xdst->origin);
+	xdst->origin = NULL;
+	kfree(xdst->partner);
+	xdst->partner = NULL;
+#endif
+}
+#endif
+
+void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
+
+struct sec_path {
+	atomic_t		refcnt;
+	int			len;
+	struct xfrm_state	*xvec[XFRM_MAX_DEPTH];
+};
+
+static inline int secpath_exists(struct sk_buff *skb)
+{
+#ifdef CONFIG_XFRM
+	return skb->sp != NULL;
+#else
+	return 0;
+#endif
+}
+
+static inline struct sec_path *
+secpath_get(struct sec_path *sp)
+{
+	if (sp)
+		atomic_inc(&sp->refcnt);
+	return sp;
+}
+
+void __secpath_destroy(struct sec_path *sp);
+
+static inline void
+secpath_put(struct sec_path *sp)
+{
+	if (sp && atomic_dec_and_test(&sp->refcnt))
+		__secpath_destroy(sp);
+}
+
+struct sec_path *secpath_dup(struct sec_path *src);
+
+static inline void
+secpath_reset(struct sk_buff *skb)
+{
+#ifdef CONFIG_XFRM
+	secpath_put(skb->sp);
+	skb->sp = NULL;
+#endif
+}
+
+static inline int
+xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
+{
+	switch (family) {
+	case AF_INET:
+		return addr->a4 == 0;
+	case AF_INET6:
+		return ipv6_addr_any(&addr->in6);
+	}
+	return 0;
+}
+
+static inline int
+__xfrm4_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
+{
+	return	(tmpl->saddr.a4 &&
+		 tmpl->saddr.a4 != x->props.saddr.a4);
+}
+
+static inline int
+__xfrm6_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x)
+{
+	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
+		 !ipv6_addr_equal((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
+}
+
+static inline int
+xfrm_state_addr_cmp(const struct xfrm_tmpl *tmpl, const struct xfrm_state *x, unsigned short family)
+{
+	switch (family) {
+	case AF_INET:
+		return __xfrm4_state_addr_cmp(tmpl, x);
+	case AF_INET6:
+		return __xfrm6_state_addr_cmp(tmpl, x);
+	}
+	return !0;
+}
+
+#ifdef CONFIG_XFRM
+int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb,
+			unsigned short family);
+
+static inline int __xfrm_policy_check2(struct sock *sk, int dir,
+				       struct sk_buff *skb,
+				       unsigned int family, int reverse)
+{
+	struct net *net = dev_net(skb->dev);
+	int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
+
+	if (sk && sk->sk_policy[XFRM_POLICY_IN])
+		return __xfrm_policy_check(sk, ndir, skb, family);
+
+	return	(!net->xfrm.policy_count[dir] && !skb->sp) ||
+		(skb_dst(skb)->flags & DST_NOPOLICY) ||
+		__xfrm_policy_check(sk, ndir, skb, family);
+}
+
+static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
+{
+	return __xfrm_policy_check2(sk, dir, skb, family, 0);
+}
+
+static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
+{
+	return xfrm_policy_check(sk, dir, skb, AF_INET);
+}
+
+static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
+{
+	return xfrm_policy_check(sk, dir, skb, AF_INET6);
+}
+
+static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
+					     struct sk_buff *skb)
+{
+	return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
+}
+
+static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
+					     struct sk_buff *skb)
+{
+	return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
+}
+
+int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
+			  unsigned int family, int reverse);
+
+static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
+				      unsigned int family)
+{
+	return __xfrm_decode_session(skb, fl, family, 0);
+}
+
+static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
+					      struct flowi *fl,
+					      unsigned int family)
+{
+	return __xfrm_decode_session(skb, fl, family, 1);
+}
+
+int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
+
+static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
+{
+	struct net *net = dev_net(skb->dev);
+
+	return	!net->xfrm.policy_count[XFRM_POLICY_OUT] ||
+		(skb_dst(skb)->flags & DST_NOXFRM) ||
+		__xfrm_route_forward(skb, family);
+}
+
+static inline int xfrm4_route_forward(struct sk_buff *skb)
+{
+	return xfrm_route_forward(skb, AF_INET);
+}
+
+static inline int xfrm6_route_forward(struct sk_buff *skb)
+{
+	return xfrm_route_forward(skb, AF_INET6);
+}
+
+int __xfrm_sk_clone_policy(struct sock *sk);
+
+static inline int xfrm_sk_clone_policy(struct sock *sk)
+{
+	if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
+		return __xfrm_sk_clone_policy(sk);
+	return 0;
+}
+
+int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
+
+static inline void xfrm_sk_free_policy(struct sock *sk)
+{
+	if (unlikely(sk->sk_policy[0] != NULL)) {
+		xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
+		sk->sk_policy[0] = NULL;
+	}
+	if (unlikely(sk->sk_policy[1] != NULL)) {
+		xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
+		sk->sk_policy[1] = NULL;
+	}
+}
+
+void xfrm_garbage_collect(struct net *net);
+
+#else
+
+static inline void xfrm_sk_free_policy(struct sock *sk) {}
+static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
+static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }  
+static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; } 
+static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
+{ 
+	return 1; 
+} 
+static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
+{
+	return 1;
+}
+static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
+{
+	return 1;
+}
+static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
+					      struct flowi *fl,
+					      unsigned int family)
+{
+	return -ENOSYS;
+}
+static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
+					     struct sk_buff *skb)
+{
+	return 1;
+}
+static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
+					     struct sk_buff *skb)
+{
+	return 1;
+}
+static inline void xfrm_garbage_collect(struct net *net)
+{
+}
+#endif
+
+static __inline__
+xfrm_address_t *xfrm_flowi_daddr(const struct flowi *fl, unsigned short family)
+{
+	switch (family){
+	case AF_INET:
+		return (xfrm_address_t *)&fl->u.ip4.daddr;
+	case AF_INET6:
+		return (xfrm_address_t *)&fl->u.ip6.daddr;
+	}
+	return NULL;
+}
+
+static __inline__
+xfrm_address_t *xfrm_flowi_saddr(const struct flowi *fl, unsigned short family)
+{
+	switch (family){
+	case AF_INET:
+		return (xfrm_address_t *)&fl->u.ip4.saddr;
+	case AF_INET6:
+		return (xfrm_address_t *)&fl->u.ip6.saddr;
+	}
+	return NULL;
+}
+
+static __inline__
+void xfrm_flowi_addr_get(const struct flowi *fl,
+			 xfrm_address_t *saddr, xfrm_address_t *daddr,
+			 unsigned short family)
+{
+	switch(family) {
+	case AF_INET:
+		memcpy(&saddr->a4, &fl->u.ip4.saddr, sizeof(saddr->a4));
+		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
+		break;
+	case AF_INET6:
+		saddr->in6 = fl->u.ip6.saddr;
+		daddr->in6 = fl->u.ip6.daddr;
+		break;
+	}
+}
+
+static __inline__ int
+__xfrm4_state_addr_check(const struct xfrm_state *x,
+			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
+{
+	if (daddr->a4 == x->id.daddr.a4 &&
+	    (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
+		return 1;
+	return 0;
+}
+
+static __inline__ int
+__xfrm6_state_addr_check(const struct xfrm_state *x,
+			 const xfrm_address_t *daddr, const xfrm_address_t *saddr)
+{
+	if (ipv6_addr_equal((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
+	    (ipv6_addr_equal((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr) ||
+	     ipv6_addr_any((struct in6_addr *)saddr) || 
+	     ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
+		return 1;
+	return 0;
+}
+
+static __inline__ int
+xfrm_state_addr_check(const struct xfrm_state *x,
+		      const xfrm_address_t *daddr, const xfrm_address_t *saddr,
+		      unsigned short family)
+{
+	switch (family) {
+	case AF_INET:
+		return __xfrm4_state_addr_check(x, daddr, saddr);
+	case AF_INET6:
+		return __xfrm6_state_addr_check(x, daddr, saddr);
+	}
+	return 0;
+}
+
+static __inline__ int
+xfrm_state_addr_flow_check(const struct xfrm_state *x, const struct flowi *fl,
+			   unsigned short family)
+{
+	switch (family) {
+	case AF_INET:
+		return __xfrm4_state_addr_check(x,
+						(const xfrm_address_t *)&fl->u.ip4.daddr,
+						(const xfrm_address_t *)&fl->u.ip4.saddr);
+	case AF_INET6:
+		return __xfrm6_state_addr_check(x,
+						(const xfrm_address_t *)&fl->u.ip6.daddr,
+						(const xfrm_address_t *)&fl->u.ip6.saddr);
+	}
+	return 0;
+}
+
+static inline int xfrm_state_kern(const struct xfrm_state *x)
+{
+	return atomic_read(&x->tunnel_users);
+}
+
+static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
+{
+	return (!userproto || proto == userproto ||
+		(userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
+						  proto == IPPROTO_ESP ||
+						  proto == IPPROTO_COMP)));
+}
+
+/*
+ * xfrm algorithm information
+ */
+struct xfrm_algo_aead_info {
+	u16 icv_truncbits;
+};
+
+struct xfrm_algo_auth_info {
+	u16 icv_truncbits;
+	u16 icv_fullbits;
+};
+
+struct xfrm_algo_encr_info {
+	u16 blockbits;
+	u16 defkeybits;
+};
+
+struct xfrm_algo_comp_info {
+	u16 threshold;
+};
+
+struct xfrm_algo_desc {
+	char *name;
+	char *compat;
+	u8 available:1;
+	u8 pfkey_supported:1;
+	union {
+		struct xfrm_algo_aead_info aead;
+		struct xfrm_algo_auth_info auth;
+		struct xfrm_algo_encr_info encr;
+		struct xfrm_algo_comp_info comp;
+	} uinfo;
+	struct sadb_alg desc;
+};
+
+/* XFRM protocol handlers.  */
+struct xfrm4_protocol {
+	int (*handler)(struct sk_buff *skb);
+	int (*input_handler)(struct sk_buff *skb, int nexthdr, __be32 spi,
+			     int encap_type);
+	int (*cb_handler)(struct sk_buff *skb, int err);
+	int (*err_handler)(struct sk_buff *skb, u32 info);
+
+	struct xfrm4_protocol __rcu *next;
+	int priority;
+};
+
+struct xfrm6_protocol {
+	int (*handler)(struct sk_buff *skb);
+	int (*cb_handler)(struct sk_buff *skb, int err);
+	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
+			   u8 type, u8 code, int offset, __be32 info);
+
+	struct xfrm6_protocol __rcu *next;
+	int priority;
+};
+
+/* XFRM tunnel handlers.  */
+struct xfrm_tunnel {
+	int (*handler)(struct sk_buff *skb);
+	int (*err_handler)(struct sk_buff *skb, u32 info);
+
+	struct xfrm_tunnel __rcu *next;
+	int priority;
+};
+
+struct xfrm6_tunnel {
+	int (*handler)(struct sk_buff *skb);
+	int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
+			   u8 type, u8 code, int offset, __be32 info);
+	struct xfrm6_tunnel __rcu *next;
+	int priority;
+};
+
+void xfrm_init(void);
+void xfrm4_init(void);
+int xfrm_state_init(struct net *net);
+void xfrm_state_fini(struct net *net);
+void xfrm4_state_init(void);
+void xfrm4_protocol_init(void);
+#ifdef CONFIG_XFRM
+int xfrm6_init(void);
+void xfrm6_fini(void);
+int xfrm6_state_init(void);
+void xfrm6_state_fini(void);
+int xfrm6_protocol_init(void);
+void xfrm6_protocol_fini(void);
+#else
+static inline int xfrm6_init(void)
+{
+	return 0;
+}
+static inline void xfrm6_fini(void)
+{
+	;
+}
+#endif
+
+#ifdef CONFIG_XFRM_STATISTICS
+int xfrm_proc_init(struct net *net);
+void xfrm_proc_fini(struct net *net);
+#endif
+
+int xfrm_sysctl_init(struct net *net);
+#ifdef CONFIG_SYSCTL
+void xfrm_sysctl_fini(struct net *net);
+#else
+static inline void xfrm_sysctl_fini(struct net *net)
+{
+}
+#endif
+
+void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
+			  struct xfrm_address_filter *filter);
+int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
+		    int (*func)(struct xfrm_state *, int, void*), void *);
+void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net);
+struct xfrm_state *xfrm_state_alloc(struct net *net);
+struct xfrm_state *xfrm_state_find(const xfrm_address_t *daddr,
+				   const xfrm_address_t *saddr,
+				   const struct flowi *fl,
+				   struct xfrm_tmpl *tmpl,
+				   struct xfrm_policy *pol, int *err,
+				   unsigned short family);
+struct xfrm_state *xfrm_stateonly_find(struct net *net, u32 mark,
+				       xfrm_address_t *daddr,
+				       xfrm_address_t *saddr,
+				       unsigned short family,
+				       u8 mode, u8 proto, u32 reqid);
+struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
+					      unsigned short family);
+int xfrm_state_check_expire(struct xfrm_state *x);
+void xfrm_state_insert(struct xfrm_state *x);
+int xfrm_state_add(struct xfrm_state *x);
+int xfrm_state_update(struct xfrm_state *x);
+struct xfrm_state *xfrm_state_lookup(struct net *net, u32 mark,
+				     const xfrm_address_t *daddr, __be32 spi,
+				     u8 proto, unsigned short family);
+struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, u32 mark,
+					    const xfrm_address_t *daddr,
+					    const xfrm_address_t *saddr,
+					    u8 proto,
+					    unsigned short family);
+#ifdef CONFIG_XFRM_SUB_POLICY
+int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
+		   unsigned short family, struct net *net);
+int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
+		    unsigned short family);
+#else
+static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
+				 int n, unsigned short family, struct net *net)
+{
+	return -ENOSYS;
+}
+
+static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
+				  int n, unsigned short family)
+{
+	return -ENOSYS;
+}
+#endif
+
+struct xfrmk_sadinfo {
+	u32 sadhcnt; /* current hash bkts */
+	u32 sadhmcnt; /* max allowed hash bkts */
+	u32 sadcnt; /* current running count */
+};
+
+struct xfrmk_spdinfo {
+	u32 incnt;
+	u32 outcnt;
+	u32 fwdcnt;
+	u32 inscnt;
+	u32 outscnt;
+	u32 fwdscnt;
+	u32 spdhcnt;
+	u32 spdhmcnt;
+};
+
+struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
+int xfrm_state_delete(struct xfrm_state *x);
+int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
+void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si);
+void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si);
+u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq);
+int xfrm_init_replay(struct xfrm_state *x);
+int xfrm_state_mtu(struct xfrm_state *x, int mtu);
+int __xfrm_init_state(struct xfrm_state *x, bool init_replay);
+int xfrm_init_state(struct xfrm_state *x);
+int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
+int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type);
+int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
+int xfrm_output_resume(struct sk_buff *skb, int err);
+int xfrm_output(struct sock *sk, struct sk_buff *skb);
+int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
+void xfrm_local_error(struct sk_buff *skb, int mtu);
+int xfrm4_extract_header(struct sk_buff *skb);
+int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
+int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
+		    int encap_type);
+int xfrm4_transport_finish(struct sk_buff *skb, int async);
+int xfrm4_rcv(struct sk_buff *skb);
+
+static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
+{
+	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
+	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
+	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
+	return xfrm_input(skb, nexthdr, spi, 0);
+}
+
+int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
+int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
+int xfrm4_output(struct sock *sk, struct sk_buff *skb);
+int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
+int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
+int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
+int xfrm4_protocol_deregister(struct xfrm4_protocol *handler, unsigned char protocol);
+int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
+int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
+void xfrm4_local_error(struct sk_buff *skb, u32 mtu);
+int xfrm6_extract_header(struct sk_buff *skb);
+int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
+int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
+int xfrm6_transport_finish(struct sk_buff *skb, int async);
+int xfrm6_rcv(struct sk_buff *skb);
+int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
+		     xfrm_address_t *saddr, u8 proto);
+void xfrm6_local_error(struct sk_buff *skb, u32 mtu);
+int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
+int xfrm6_protocol_register(struct xfrm6_protocol *handler, unsigned char protocol);
+int xfrm6_protocol_deregister(struct xfrm6_protocol *handler, unsigned char protocol);
+int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
+int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
+__be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
+__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
+int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
+int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
+int xfrm6_output(struct sock *sk, struct sk_buff *skb);
+int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
+int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
+			  u8 **prevhdr);
+
+#ifdef CONFIG_XFRM
+int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
+int xfrm_user_policy(struct sock *sk, int optname,
+		     u8 __user *optval, int optlen);
+#else
+static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
+{
+ 	return -ENOPROTOOPT;
+} 
+
+static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ 	/* should not happen */
+ 	kfree_skb(skb);
+	return 0;
+}
+#endif
+
+struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
+
+void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
+int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
+		     int (*func)(struct xfrm_policy *, int, int, void*),
+		     void *);
+void xfrm_policy_walk_done(struct xfrm_policy_walk *walk, struct net *net);
+int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
+struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u32 mark,
+					  u8 type, int dir,
+					  struct xfrm_selector *sel,
+					  struct xfrm_sec_ctx *ctx, int delete,
+					  int *err);
+struct xfrm_policy *xfrm_policy_byid(struct net *net, u32 mark, u8, int dir,
+				     u32 id, int delete, int *err);
+int xfrm_policy_flush(struct net *net, u8 type, bool task_valid);
+void xfrm_policy_hash_rebuild(struct net *net);
+u32 xfrm_get_acqseq(void);
+int verify_spi_info(u8 proto, u32 min, u32 max);
+int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
+struct xfrm_state *xfrm_find_acq(struct net *net, const struct xfrm_mark *mark,
+				 u8 mode, u32 reqid, u8 proto,
+				 const xfrm_address_t *daddr,
+				 const xfrm_address_t *saddr, int create,
+				 unsigned short family);
+int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
+
+#ifdef CONFIG_XFRM_MIGRATE
+int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+	       const struct xfrm_migrate *m, int num_bundles,
+	       const struct xfrm_kmaddress *k);
+struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net);
+struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
+				      struct xfrm_migrate *m);
+int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+		 struct xfrm_migrate *m, int num_bundles,
+		 struct xfrm_kmaddress *k, struct net *net);
+#endif
+
+int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
+void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid);
+int km_report(struct net *net, u8 proto, struct xfrm_selector *sel,
+	      xfrm_address_t *addr);
+
+void xfrm_input_init(void);
+int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
+
+void xfrm_probe_algs(void);
+int xfrm_count_pfkey_auth_supported(void);
+int xfrm_count_pfkey_enc_supported(void);
+struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
+struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
+struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
+struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
+struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
+struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe);
+struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe);
+struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe);
+struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len,
+					    int probe);
+
+static inline bool xfrm6_addr_equal(const xfrm_address_t *a,
+				    const xfrm_address_t *b)
+{
+	return ipv6_addr_equal((const struct in6_addr *)a,
+			       (const struct in6_addr *)b);
+}
+
+static inline bool xfrm_addr_equal(const xfrm_address_t *a,
+				   const xfrm_address_t *b,
+				   sa_family_t family)
+{
+	switch (family) {
+	default:
+	case AF_INET:
+		return ((__force u32)a->a4 ^ (__force u32)b->a4) == 0;
+	case AF_INET6:
+		return xfrm6_addr_equal(a, b);
+	}
+}
+
+static inline int xfrm_policy_id2dir(u32 index)
+{
+	return index & 7;
+}
+
+#ifdef CONFIG_XFRM
+static inline int xfrm_aevent_is_on(struct net *net)
+{
+	struct sock *nlsk;
+	int ret = 0;
+
+	rcu_read_lock();
+	nlsk = rcu_dereference(net->xfrm.nlsk);
+	if (nlsk)
+		ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
+	rcu_read_unlock();
+	return ret;
+}
+
+static inline int xfrm_acquire_is_on(struct net *net)
+{
+	struct sock *nlsk;
+	int ret = 0;
+
+	rcu_read_lock();
+	nlsk = rcu_dereference(net->xfrm.nlsk);
+	if (nlsk)
+		ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
+	rcu_read_unlock();
+
+	return ret;
+}
+#endif
+
+static inline int aead_len(struct xfrm_algo_aead *alg)
+{
+	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
+}
+
+static inline int xfrm_alg_len(const struct xfrm_algo *alg)
+{
+	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
+}
+
+static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
+{
+	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
+}
+
+static inline int xfrm_replay_state_esn_len(struct xfrm_replay_state_esn *replay_esn)
+{
+	return sizeof(*replay_esn) + replay_esn->bmp_len * sizeof(__u32);
+}
+
+#ifdef CONFIG_XFRM_MIGRATE
+static inline int xfrm_replay_clone(struct xfrm_state *x,
+				     struct xfrm_state *orig)
+{
+	x->replay_esn = kzalloc(xfrm_replay_state_esn_len(orig->replay_esn),
+				GFP_KERNEL);
+	if (!x->replay_esn)
+		return -ENOMEM;
+
+	x->replay_esn->bmp_len = orig->replay_esn->bmp_len;
+	x->replay_esn->replay_window = orig->replay_esn->replay_window;
+
+	x->preplay_esn = kmemdup(x->replay_esn,
+				 xfrm_replay_state_esn_len(x->replay_esn),
+				 GFP_KERNEL);
+	if (!x->preplay_esn) {
+		kfree(x->replay_esn);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static inline struct xfrm_algo_aead *xfrm_algo_aead_clone(struct xfrm_algo_aead *orig)
+{
+	return kmemdup(orig, aead_len(orig), GFP_KERNEL);
+}
+
+
+static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
+{
+	return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
+}
+
+static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
+{
+	return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
+}
+
+static inline void xfrm_states_put(struct xfrm_state **states, int n)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		xfrm_state_put(*(states + i));
+}
+
+static inline void xfrm_states_delete(struct xfrm_state **states, int n)
+{
+	int i;
+	for (i = 0; i < n; i++)
+		xfrm_state_delete(*(states + i));
+}
+#endif
+
+#ifdef CONFIG_XFRM
+static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
+{
+	return skb->sp->xvec[skb->sp->len - 1];
+}
+#endif
+
+static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
+{
+	if (attrs[XFRMA_MARK])
+		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(struct xfrm_mark));
+	else
+		m->v = m->m = 0;
+
+	return m->v & m->m;
+}
+
+static inline int xfrm_mark_put(struct sk_buff *skb, const struct xfrm_mark *m)
+{
+	int ret = 0;
+
+	if (m->m | m->v)
+		ret = nla_put(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
+	return ret;
+}
+
+static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
+				    unsigned int family)
+{
+	bool tunnel = false;
+
+	switch(family) {
+	case AF_INET:
+		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
+			tunnel = true;
+		break;
+	case AF_INET6:
+		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
+			tunnel = true;
+		break;
+	}
+	if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
+		return -EINVAL;
+
+	return 0;
+}
+#endif	/* _NET_XFRM_H */