Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 905 insertions, 0 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
new file mode 100644
index 0000000..73e9a8c
--- /dev/null
+++ b/include/net/xfrm.h
@@ -0,0 +1,905 @@
+#ifndef _NET_XFRM_H
+#define _NET_XFRM_H
+
+#include <linux/xfrm.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/crypto.h>
+#include <linux/pfkeyv2.h>
+#include <linux/in6.h>
+
+#include <net/sock.h>
+#include <net/dst.h>
+#include <net/route.h>
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+
+#define XFRM_ALIGN8(len)	(((len) + 7) & ~7)
+
+extern struct semaphore xfrm_cfg_sem;
+
+/* 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.
+ */
+
+/* Full description of state of transformer. */
+struct xfrm_state
+{
+	/* Note: bydst is re-used during gc */
+	struct list_head	bydst;
+	struct list_head	byspi;
+
+	atomic_t		refcnt;
+	spinlock_t		lock;
+
+	struct xfrm_id		id;
+	struct xfrm_selector	sel;
+
+	/* Key manger bits */
+	struct {
+		u8		state;
+		u8		dying;
+		u32		seq;
+	} 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;
+	} props;
+
+	struct xfrm_lifetime_cfg lft;
+
+	/* Data for transformer */
+	struct xfrm_algo	*aalg;
+	struct xfrm_algo	*ealg;
+	struct xfrm_algo	*calg;
+
+	/* Data for encapsulator */
+	struct xfrm_encap_tmpl	*encap;
+
+	/* 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;
+
+	/* Statistics */
+	struct xfrm_stats	stats;
+
+	struct xfrm_lifetime_cur curlft;
+	struct timer_list	timer;
+
+	/* Reference to data common to all the instances of this
+	 * transformer. */
+	struct xfrm_type	*type;
+
+	/* Private data of this transformer, format is opaque,
+	 * interpreted by xfrm_type methods. */
+	void			*data;
+};
+
+enum {
+	XFRM_STATE_VOID,
+	XFRM_STATE_ACQ,
+	XFRM_STATE_VALID,
+	XFRM_STATE_ERROR,
+	XFRM_STATE_EXPIRED,
+	XFRM_STATE_DEAD
+};
+
+struct xfrm_type;
+struct xfrm_dst;
+struct xfrm_policy_afinfo {
+	unsigned short		family;
+	rwlock_t		lock;
+	struct xfrm_type_map	*type_map;
+	struct dst_ops		*dst_ops;
+	void			(*garbage_collect)(void);
+	int			(*dst_lookup)(struct xfrm_dst **dst, struct flowi *fl);
+	struct dst_entry	*(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
+	int			(*bundle_create)(struct xfrm_policy *policy, 
+						 struct xfrm_state **xfrm, 
+						 int nx,
+						 struct flowi *fl, 
+						 struct dst_entry **dst_p);
+	void			(*decode_session)(struct sk_buff *skb,
+						  struct flowi *fl);
+};
+
+extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
+extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
+
+#define XFRM_ACQ_EXPIRES	30
+
+struct xfrm_tmpl;
+struct xfrm_state_afinfo {
+	unsigned short		family;
+	rwlock_t		lock;
+	struct list_head	*state_bydst;
+	struct list_head	*state_byspi;
+	void			(*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
+						struct xfrm_tmpl *tmpl,
+						xfrm_address_t *daddr, xfrm_address_t *saddr);
+	struct xfrm_state	*(*state_lookup)(xfrm_address_t *daddr, u32 spi, u8 proto);
+	struct xfrm_state	*(*find_acq)(u8 mode, u32 reqid, u8 proto, 
+					     xfrm_address_t *daddr, xfrm_address_t *saddr, 
+					     int create);
+};
+
+extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
+extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
+
+extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
+
+struct xfrm_decap_state;
+struct xfrm_type
+{
+	char			*description;
+	struct module		*owner;
+	__u8			proto;
+
+	int			(*init_state)(struct xfrm_state *x, void *args);
+	void			(*destructor)(struct xfrm_state *);
+	int			(*input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
+	int			(*post_input)(struct xfrm_state *, struct xfrm_decap_state *, struct sk_buff *skb);
+	int			(*output)(struct xfrm_state *, struct sk_buff *pskb);
+	/* Estimate maximal size of result of transformation of a dgram */
+	u32			(*get_max_size)(struct xfrm_state *, int size);
+};
+
+struct xfrm_type_map {
+	rwlock_t		lock;
+	struct xfrm_type	*map[256];
+};
+
+extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);
+extern int xfrm_unregister_type(struct xfrm_type *type, unsigned short family);
+extern struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family);
+extern void xfrm_put_type(struct xfrm_type *type);
+
+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;
+
+	__u32			reqid;
+
+/* Mode: transport/tunnel */
+	__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;
+
+/* Bit mask of algos allowed for acquisition */
+	__u32			aalgos;
+	__u32			ealgos;
+	__u32			calgos;
+};
+
+#define XFRM_MAX_DEPTH		4
+
+struct xfrm_policy
+{
+	struct xfrm_policy	*next;
+	struct list_head	list;
+
+	/* This lock only affects elements except for entry. */
+	rwlock_t		lock;
+	atomic_t		refcnt;
+	struct timer_list	timer;
+
+	u32			priority;
+	u32			index;
+	struct xfrm_selector	selector;
+	struct xfrm_lifetime_cfg lft;
+	struct xfrm_lifetime_cur curlft;
+	struct dst_entry       *bundles;
+	__u16			family;
+	__u8			action;
+	__u8			flags;
+	__u8			dead;
+	__u8			xfrm_nr;
+	struct xfrm_tmpl       	xfrm_vec[XFRM_MAX_DEPTH];
+};
+
+#define XFRM_KM_TIMEOUT		30
+
+struct xfrm_mgr
+{
+	struct list_head	list;
+	char			*id;
+	int			(*notify)(struct xfrm_state *x, int event);
+	int			(*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
+	struct xfrm_policy	*(*compile_policy)(u16 family, int opt, u8 *data, int len, int *dir);
+	int			(*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
+	int			(*notify_policy)(struct xfrm_policy *x, int dir, int event);
+};
+
+extern int xfrm_register_km(struct xfrm_mgr *km);
+extern int xfrm_unregister_km(struct xfrm_mgr *km);
+
+
+extern struct xfrm_policy *xfrm_policy_list[XFRM_POLICY_MAX*2];
+
+static inline void xfrm_pol_hold(struct xfrm_policy *policy)
+{
+	if (likely(policy != NULL))
+		atomic_inc(&policy->refcnt);
+}
+
+extern 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);
+}
+
+#define XFRM_DST_HSIZE		1024
+
+static __inline__
+unsigned __xfrm4_dst_hash(xfrm_address_t *addr)
+{
+	unsigned h;
+	h = ntohl(addr->a4);
+	h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
+	return h;
+}
+
+static __inline__
+unsigned __xfrm6_dst_hash(xfrm_address_t *addr)
+{
+	unsigned h;
+	h = ntohl(addr->a6[2]^addr->a6[3]);
+	h = (h ^ (h>>16)) % XFRM_DST_HSIZE;
+	return h;
+}
+
+static __inline__
+unsigned xfrm_dst_hash(xfrm_address_t *addr, unsigned short family)
+{
+	switch (family) {
+	case AF_INET:
+		return __xfrm4_dst_hash(addr);
+	case AF_INET6:
+		return __xfrm6_dst_hash(addr);
+	}
+	return 0;
+}
+
+static __inline__
+unsigned __xfrm4_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
+{
+	unsigned h;
+	h = ntohl(addr->a4^spi^proto);
+	h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
+	return h;
+}
+
+static __inline__
+unsigned __xfrm6_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto)
+{
+	unsigned h;
+	h = ntohl(addr->a6[2]^addr->a6[3]^spi^proto);
+	h = (h ^ (h>>10) ^ (h>>20)) % XFRM_DST_HSIZE;
+	return h;
+}
+
+static __inline__
+unsigned xfrm_spi_hash(xfrm_address_t *addr, u32 spi, u8 proto, unsigned short family)
+{
+	switch (family) {
+	case AF_INET:
+		return __xfrm4_spi_hash(addr, spi, proto);
+	case AF_INET6:
+		return __xfrm6_spi_hash(addr, spi, proto);
+	}
+	return 0;	/*XXX*/
+}
+
+extern void __xfrm_state_destroy(struct xfrm_state *);
+
+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__ int addr_match(void *token1, void *token2, int prefixlen)
+{
+	__u32 *a1 = token1;
+	__u32 *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 0;
+
+	if (pbi) {
+		__u32 mask;
+
+		mask = htonl((0xffffffff) << (32 - pbi));
+
+		if ((a1[pdw] ^ a2[pdw]) & mask)
+			return 0;
+	}
+
+	return 1;
+}
+
+static __inline__
+u16 xfrm_flowi_sport(struct flowi *fl)
+{
+	u16 port;
+	switch(fl->proto) {
+	case IPPROTO_TCP:
+	case IPPROTO_UDP:
+	case IPPROTO_SCTP:
+		port = fl->fl_ip_sport;
+		break;
+	case IPPROTO_ICMP:
+	case IPPROTO_ICMPV6:
+		port = htons(fl->fl_icmp_type);
+		break;
+	default:
+		port = 0;	/*XXX*/
+	}
+	return port;
+}
+
+static __inline__
+u16 xfrm_flowi_dport(struct flowi *fl)
+{
+	u16 port;
+	switch(fl->proto) {
+	case IPPROTO_TCP:
+	case IPPROTO_UDP:
+	case IPPROTO_SCTP:
+		port = fl->fl_ip_dport;
+		break;
+	case IPPROTO_ICMP:
+	case IPPROTO_ICMPV6:
+		port = htons(fl->fl_icmp_code);
+		break;
+	default:
+		port = 0;	/*XXX*/
+	}
+	return port;
+}
+
+static inline int
+__xfrm4_selector_match(struct xfrm_selector *sel, struct flowi *fl)
+{
+	return  addr_match(&fl->fl4_dst, &sel->daddr, sel->prefixlen_d) &&
+		addr_match(&fl->fl4_src, &sel->saddr, sel->prefixlen_s) &&
+		!((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
+		!((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
+		(fl->proto == sel->proto || !sel->proto) &&
+		(fl->oif == sel->ifindex || !sel->ifindex);
+}
+
+static inline int
+__xfrm6_selector_match(struct xfrm_selector *sel, struct flowi *fl)
+{
+	return  addr_match(&fl->fl6_dst, &sel->daddr, sel->prefixlen_d) &&
+		addr_match(&fl->fl6_src, &sel->saddr, sel->prefixlen_s) &&
+		!((xfrm_flowi_dport(fl) ^ sel->dport) & sel->dport_mask) &&
+		!((xfrm_flowi_sport(fl) ^ sel->sport) & sel->sport_mask) &&
+		(fl->proto == sel->proto || !sel->proto) &&
+		(fl->oif == sel->ifindex || !sel->ifindex);
+}
+
+static inline int
+xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
+		    unsigned short family)
+{
+	switch (family) {
+	case AF_INET:
+		return __xfrm4_selector_match(sel, fl);
+	case AF_INET6:
+		return __xfrm6_selector_match(sel, fl);
+	}
+	return 0;
+}
+
+/* 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 xfrm_dst		*next;
+		struct dst_entry	dst;
+		struct rtable		rt;
+		struct rt6_info		rt6;
+	} u;
+	struct dst_entry *route;
+	u32 route_mtu_cached;
+	u32 child_mtu_cached;
+};
+
+/* Decapsulation state, used by the input to store data during
+ * decapsulation procedure, to be used later (during the policy
+ * check
+ */
+struct xfrm_decap_state {
+	char	decap_data[20];
+	__u16	decap_type;
+};   
+
+struct sec_decap_state {
+	struct xfrm_state	*xvec;
+	struct xfrm_decap_state decap;
+};
+
+struct sec_path
+{
+	atomic_t		refcnt;
+	int			len;
+	struct sec_decap_state	x[XFRM_MAX_DEPTH];
+};
+
+static inline struct sec_path *
+secpath_get(struct sec_path *sp)
+{
+	if (sp)
+		atomic_inc(&sp->refcnt);
+	return sp;
+}
+
+extern 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);
+}
+
+extern 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
+__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
+{
+	return	(tmpl->saddr.a4 &&
+		 tmpl->saddr.a4 != x->props.saddr.a4);
+}
+
+static inline int
+__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
+{
+	return	(!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
+		 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
+}
+
+static inline int
+xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, 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
+
+extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
+
+static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
+{
+	if (sk && sk->sk_policy[XFRM_POLICY_IN])
+		return __xfrm_policy_check(sk, dir, skb, family);
+		
+	return	(!xfrm_policy_list[dir] && !skb->sp) ||
+		(skb->dst->flags & DST_NOPOLICY) ||
+		__xfrm_policy_check(sk, dir, skb, family);
+}
+
+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);
+}
+
+
+extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
+
+static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
+{
+	return	!xfrm_policy_list[XFRM_POLICY_OUT] ||
+		(skb->dst->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);
+}
+
+extern 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;
+}
+
+extern void 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;
+	}
+}
+
+#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;
+}
+#endif
+
+static __inline__
+xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
+{
+	switch (family){
+	case AF_INET:
+		return (xfrm_address_t *)&fl->fl4_dst;
+	case AF_INET6:
+		return (xfrm_address_t *)&fl->fl6_dst;
+	}
+	return NULL;
+}
+
+static __inline__
+xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
+{
+	switch (family){
+	case AF_INET:
+		return (xfrm_address_t *)&fl->fl4_src;
+	case AF_INET6:
+		return (xfrm_address_t *)&fl->fl6_src;
+	}
+	return NULL;
+}
+
+static __inline__ int
+__xfrm4_state_addr_check(struct xfrm_state *x,
+			 xfrm_address_t *daddr, 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(struct xfrm_state *x,
+			 xfrm_address_t *daddr, xfrm_address_t *saddr)
+{
+	if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
+	    (!ipv6_addr_cmp((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(struct xfrm_state *x,
+		      xfrm_address_t *daddr, 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_kern(struct xfrm_state *x)
+{
+	return atomic_read(&x->tunnel_users);
+}
+
+/*
+ * xfrm algorithm information
+ */
+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;
+	u8 available:1;
+	union {
+		struct xfrm_algo_auth_info auth;
+		struct xfrm_algo_encr_info encr;
+		struct xfrm_algo_comp_info comp;
+	} uinfo;
+	struct sadb_alg desc;
+};
+
+/* XFRM tunnel handlers.  */
+struct xfrm_tunnel {
+	int (*handler)(struct sk_buff *skb);
+	void (*err_handler)(struct sk_buff *skb, void *info);
+};
+
+struct xfrm6_tunnel {
+	int (*handler)(struct sk_buff **pskb, unsigned int *nhoffp);
+	void (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
+			    int type, int code, int offset, __u32 info);
+};
+
+extern void xfrm_init(void);
+extern void xfrm4_init(void);
+extern void xfrm6_init(void);
+extern void xfrm6_fini(void);
+extern void xfrm_state_init(void);
+extern void xfrm4_state_init(void);
+extern void xfrm4_state_fini(void);
+extern void xfrm6_state_init(void);
+extern void xfrm6_state_fini(void);
+
+extern int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), void *);
+extern struct xfrm_state *xfrm_state_alloc(void);
+extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, 
+					  struct flowi *fl, struct xfrm_tmpl *tmpl,
+					  struct xfrm_policy *pol, int *err,
+					  unsigned short family);
+extern int xfrm_state_check_expire(struct xfrm_state *x);
+extern void xfrm_state_insert(struct xfrm_state *x);
+extern int xfrm_state_add(struct xfrm_state *x);
+extern int xfrm_state_update(struct xfrm_state *x);
+extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family);
+extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
+extern void xfrm_state_delete(struct xfrm_state *x);
+extern void xfrm_state_flush(u8 proto);
+extern int xfrm_replay_check(struct xfrm_state *x, u32 seq);
+extern void xfrm_replay_advance(struct xfrm_state *x, u32 seq);
+extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
+extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
+extern int xfrm4_rcv(struct sk_buff *skb);
+extern int xfrm4_output(struct sk_buff *skb);
+extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
+extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
+extern int xfrm6_rcv_spi(struct sk_buff **pskb, unsigned int *nhoffp, u32 spi);
+extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
+extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
+extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
+extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
+extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
+extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
+extern int xfrm6_output(struct sk_buff *skb);
+
+#ifdef CONFIG_XFRM
+extern int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type);
+extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
+extern int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family);
+#else
+static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
+{
+ 	return -ENOPROTOOPT;
+} 
+
+static inline int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
+{
+ 	/* should not happen */
+ 	kfree_skb(skb);
+	return 0;
+}
+static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsigned short family)
+{
+	return -EINVAL;
+} 
+#endif
+
+struct xfrm_policy *xfrm_policy_alloc(int gfp);
+extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
+int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
+struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
+				      int delete);
+struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete);
+void xfrm_policy_flush(void);
+u32 xfrm_get_acqseq(void);
+void xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
+struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 
+				  xfrm_address_t *daddr, xfrm_address_t *saddr, 
+				  int create, unsigned short family);
+extern void xfrm_policy_flush(void);
+extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
+extern int xfrm_flush_bundles(void);
+extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family);
+extern void xfrm_init_pmtu(struct dst_entry *dst);
+
+extern wait_queue_head_t km_waitq;
+extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport);
+extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard);
+
+extern void xfrm_input_init(void);
+extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq);
+
+extern void xfrm_probe_algs(void);
+extern int xfrm_count_auth_supported(void);
+extern int xfrm_count_enc_supported(void);
+extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
+extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
+extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
+extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
+extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
+extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
+extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
+extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
+
+struct crypto_tfm;
+typedef void (icv_update_fn_t)(struct crypto_tfm *, struct scatterlist *, unsigned int);
+
+extern void skb_icv_walk(const struct sk_buff *skb, struct crypto_tfm *tfm,
+			 int offset, int len, icv_update_fn_t icv_update);
+
+static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
+				int family)
+{
+	switch (family) {
+	default:
+	case AF_INET:
+		return a->a4 - b->a4;
+	case AF_INET6:
+		return ipv6_addr_cmp((struct in6_addr *)a,
+				     (struct in6_addr *)b);
+	}
+}
+
+#endif	/* _NET_XFRM_H */