Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 2749 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
new file mode 100644
index 0000000..fb216c9
--- /dev/null
+++ b/net/xfrm/xfrm_policy.c
@@ -0,0 +1,2749 @@
+/*
+ * xfrm_policy.c
+ *
+ * Changes:
+ *	Mitsuru KANDA @USAGI
+ * 	Kazunori MIYAZAWA @USAGI
+ * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * 		IPv6 support
+ * 	Kazunori MIYAZAWA @USAGI
+ * 	YOSHIFUJI Hideaki
+ * 		Split up af-specific portion
+ *	Derek Atkins <derek@ihtfp.com>		Add the post_input processor
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/kmod.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/notifier.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/cache.h>
+#include <linux/audit.h>
+#include <net/dst.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+#ifdef CONFIG_XFRM_STATISTICS
+#include <net/snmp.h>
+#endif
+
+#include "xfrm_hash.h"
+
+int sysctl_xfrm_larval_drop __read_mostly = 1;
+
+#ifdef CONFIG_XFRM_STATISTICS
+DEFINE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics) __read_mostly;
+EXPORT_SYMBOL(xfrm_statistics);
+#endif
+
+DEFINE_MUTEX(xfrm_cfg_mutex);
+EXPORT_SYMBOL(xfrm_cfg_mutex);
+
+static DEFINE_RWLOCK(xfrm_policy_lock);
+
+static struct list_head xfrm_policy_all;
+unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
+EXPORT_SYMBOL(xfrm_policy_count);
+
+static DEFINE_RWLOCK(xfrm_policy_afinfo_lock);
+static struct xfrm_policy_afinfo *xfrm_policy_afinfo[NPROTO];
+
+static struct kmem_cache *xfrm_dst_cache __read_mostly;
+
+static struct work_struct xfrm_policy_gc_work;
+static HLIST_HEAD(xfrm_policy_gc_list);
+static DEFINE_SPINLOCK(xfrm_policy_gc_lock);
+
+static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family);
+static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo);
+static void xfrm_init_pmtu(struct dst_entry *dst);
+
+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);
+}
+
+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;
+}
+
+static inline struct dst_entry *__xfrm_dst_lookup(int tos,
+						  xfrm_address_t *saddr,
+						  xfrm_address_t *daddr,
+						  int family)
+{
+	struct xfrm_policy_afinfo *afinfo;
+	struct dst_entry *dst;
+
+	afinfo = xfrm_policy_get_afinfo(family);
+	if (unlikely(afinfo == NULL))
+		return ERR_PTR(-EAFNOSUPPORT);
+
+	dst = afinfo->dst_lookup(tos, saddr, daddr);
+
+	xfrm_policy_put_afinfo(afinfo);
+
+	return dst;
+}
+
+static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos,
+						xfrm_address_t *prev_saddr,
+						xfrm_address_t *prev_daddr,
+						int family)
+{
+	xfrm_address_t *saddr = &x->props.saddr;
+	xfrm_address_t *daddr = &x->id.daddr;
+	struct dst_entry *dst;
+
+	if (x->type->flags & XFRM_TYPE_LOCAL_COADDR) {
+		saddr = x->coaddr;
+		daddr = prev_daddr;
+	}
+	if (x->type->flags & XFRM_TYPE_REMOTE_COADDR) {
+		saddr = prev_saddr;
+		daddr = x->coaddr;
+	}
+
+	dst = __xfrm_dst_lookup(tos, saddr, daddr, family);
+
+	if (!IS_ERR(dst)) {
+		if (prev_saddr != saddr)
+			memcpy(prev_saddr, saddr,  sizeof(*prev_saddr));
+		if (prev_daddr != daddr)
+			memcpy(prev_daddr, daddr,  sizeof(*prev_daddr));
+	}
+
+	return dst;
+}
+
+static inline unsigned long make_jiffies(long secs)
+{
+	if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
+		return MAX_SCHEDULE_TIMEOUT-1;
+	else
+		return secs*HZ;
+}
+
+static void xfrm_policy_timer(unsigned long data)
+{
+	struct xfrm_policy *xp = (struct xfrm_policy*)data;
+	unsigned long now = get_seconds();
+	long next = LONG_MAX;
+	int warn = 0;
+	int dir;
+
+	read_lock(&xp->lock);
+
+	if (xp->walk.dead)
+		goto out;
+
+	dir = xfrm_policy_id2dir(xp->index);
+
+	if (xp->lft.hard_add_expires_seconds) {
+		long tmo = xp->lft.hard_add_expires_seconds +
+			xp->curlft.add_time - now;
+		if (tmo <= 0)
+			goto expired;
+		if (tmo < next)
+			next = tmo;
+	}
+	if (xp->lft.hard_use_expires_seconds) {
+		long tmo = xp->lft.hard_use_expires_seconds +
+			(xp->curlft.use_time ? : xp->curlft.add_time) - now;
+		if (tmo <= 0)
+			goto expired;
+		if (tmo < next)
+			next = tmo;
+	}
+	if (xp->lft.soft_add_expires_seconds) {
+		long tmo = xp->lft.soft_add_expires_seconds +
+			xp->curlft.add_time - now;
+		if (tmo <= 0) {
+			warn = 1;
+			tmo = XFRM_KM_TIMEOUT;
+		}
+		if (tmo < next)
+			next = tmo;
+	}
+	if (xp->lft.soft_use_expires_seconds) {
+		long tmo = xp->lft.soft_use_expires_seconds +
+			(xp->curlft.use_time ? : xp->curlft.add_time) - now;
+		if (tmo <= 0) {
+			warn = 1;
+			tmo = XFRM_KM_TIMEOUT;
+		}
+		if (tmo < next)
+			next = tmo;
+	}
+
+	if (warn)
+		km_policy_expired(xp, dir, 0, 0);
+	if (next != LONG_MAX &&
+	    !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
+		xfrm_pol_hold(xp);
+
+out:
+	read_unlock(&xp->lock);
+	xfrm_pol_put(xp);
+	return;
+
+expired:
+	read_unlock(&xp->lock);
+	if (!xfrm_policy_delete(xp, dir))
+		km_policy_expired(xp, dir, 1, 0);
+	xfrm_pol_put(xp);
+}
+
+
+/* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
+ * SPD calls.
+ */
+
+struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
+{
+	struct xfrm_policy *policy;
+
+	policy = kzalloc(sizeof(struct xfrm_policy), gfp);
+
+	if (policy) {
+		INIT_LIST_HEAD(&policy->walk.all);
+		INIT_HLIST_NODE(&policy->bydst);
+		INIT_HLIST_NODE(&policy->byidx);
+		rwlock_init(&policy->lock);
+		atomic_set(&policy->refcnt, 1);
+		setup_timer(&policy->timer, xfrm_policy_timer,
+				(unsigned long)policy);
+	}
+	return policy;
+}
+EXPORT_SYMBOL(xfrm_policy_alloc);
+
+/* Destroy xfrm_policy: descendant resources must be released to this moment. */
+
+void xfrm_policy_destroy(struct xfrm_policy *policy)
+{
+	BUG_ON(!policy->walk.dead);
+
+	BUG_ON(policy->bundles);
+
+	if (del_timer(&policy->timer))
+		BUG();
+
+	security_xfrm_policy_free(policy->security);
+	kfree(policy);
+}
+EXPORT_SYMBOL(xfrm_policy_destroy);
+
+static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
+{
+	struct dst_entry *dst;
+
+	while ((dst = policy->bundles) != NULL) {
+		policy->bundles = dst->next;
+		dst_free(dst);
+	}
+
+	if (del_timer(&policy->timer))
+		atomic_dec(&policy->refcnt);
+
+	if (atomic_read(&policy->refcnt) > 1)
+		flow_cache_flush();
+
+	xfrm_pol_put(policy);
+}
+
+static void xfrm_policy_gc_task(struct work_struct *work)
+{
+	struct xfrm_policy *policy;
+	struct hlist_node *entry, *tmp;
+	struct hlist_head gc_list;
+
+	spin_lock_bh(&xfrm_policy_gc_lock);
+	gc_list.first = xfrm_policy_gc_list.first;
+	INIT_HLIST_HEAD(&xfrm_policy_gc_list);
+	spin_unlock_bh(&xfrm_policy_gc_lock);
+
+	hlist_for_each_entry_safe(policy, entry, tmp, &gc_list, bydst)
+		xfrm_policy_gc_kill(policy);
+}
+
+/* Rule must be locked. Release descentant resources, announce
+ * entry dead. The rule must be unlinked from lists to the moment.
+ */
+
+static void xfrm_policy_kill(struct xfrm_policy *policy)
+{
+	int dead;
+
+	write_lock_bh(&policy->lock);
+	dead = policy->walk.dead;
+	policy->walk.dead = 1;
+	write_unlock_bh(&policy->lock);
+
+	if (unlikely(dead)) {
+		WARN_ON(1);
+		return;
+	}
+
+	spin_lock_bh(&xfrm_policy_gc_lock);
+	hlist_add_head(&policy->bydst, &xfrm_policy_gc_list);
+	spin_unlock_bh(&xfrm_policy_gc_lock);
+
+	schedule_work(&xfrm_policy_gc_work);
+}
+
+struct xfrm_policy_hash {
+	struct hlist_head	*table;
+	unsigned int		hmask;
+};
+
+static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
+static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
+static struct hlist_head *xfrm_policy_byidx __read_mostly;
+static unsigned int xfrm_idx_hmask __read_mostly;
+static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
+
+static inline unsigned int idx_hash(u32 index)
+{
+	return __idx_hash(index, xfrm_idx_hmask);
+}
+
+static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
+{
+	unsigned int hmask = xfrm_policy_bydst[dir].hmask;
+	unsigned int hash = __sel_hash(sel, family, hmask);
+
+	return (hash == hmask + 1 ?
+		&xfrm_policy_inexact[dir] :
+		xfrm_policy_bydst[dir].table + hash);
+}
+
+static struct hlist_head *policy_hash_direct(xfrm_address_t *daddr, xfrm_address_t *saddr, unsigned short family, int dir)
+{
+	unsigned int hmask = xfrm_policy_bydst[dir].hmask;
+	unsigned int hash = __addr_hash(daddr, saddr, family, hmask);
+
+	return xfrm_policy_bydst[dir].table + hash;
+}
+
+static void xfrm_dst_hash_transfer(struct hlist_head *list,
+				   struct hlist_head *ndsttable,
+				   unsigned int nhashmask)
+{
+	struct hlist_node *entry, *tmp, *entry0 = NULL;
+	struct xfrm_policy *pol;
+	unsigned int h0 = 0;
+
+redo:
+	hlist_for_each_entry_safe(pol, entry, tmp, list, bydst) {
+		unsigned int h;
+
+		h = __addr_hash(&pol->selector.daddr, &pol->selector.saddr,
+				pol->family, nhashmask);
+		if (!entry0) {
+			hlist_del(entry);
+			hlist_add_head(&pol->bydst, ndsttable+h);
+			h0 = h;
+		} else {
+			if (h != h0)
+				continue;
+			hlist_del(entry);
+			hlist_add_after(entry0, &pol->bydst);
+		}
+		entry0 = entry;
+	}
+	if (!hlist_empty(list)) {
+		entry0 = NULL;
+		goto redo;
+	}
+}
+
+static void xfrm_idx_hash_transfer(struct hlist_head *list,
+				   struct hlist_head *nidxtable,
+				   unsigned int nhashmask)
+{
+	struct hlist_node *entry, *tmp;
+	struct xfrm_policy *pol;
+
+	hlist_for_each_entry_safe(pol, entry, tmp, list, byidx) {
+		unsigned int h;
+
+		h = __idx_hash(pol->index, nhashmask);
+		hlist_add_head(&pol->byidx, nidxtable+h);
+	}
+}
+
+static unsigned long xfrm_new_hash_mask(unsigned int old_hmask)
+{
+	return ((old_hmask + 1) << 1) - 1;
+}
+
+static void xfrm_bydst_resize(int dir)
+{
+	unsigned int hmask = xfrm_policy_bydst[dir].hmask;
+	unsigned int nhashmask = xfrm_new_hash_mask(hmask);
+	unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
+	struct hlist_head *odst = xfrm_policy_bydst[dir].table;
+	struct hlist_head *ndst = xfrm_hash_alloc(nsize);
+	int i;
+
+	if (!ndst)
+		return;
+
+	write_lock_bh(&xfrm_policy_lock);
+
+	for (i = hmask; i >= 0; i--)
+		xfrm_dst_hash_transfer(odst + i, ndst, nhashmask);
+
+	xfrm_policy_bydst[dir].table = ndst;
+	xfrm_policy_bydst[dir].hmask = nhashmask;
+
+	write_unlock_bh(&xfrm_policy_lock);
+
+	xfrm_hash_free(odst, (hmask + 1) * sizeof(struct hlist_head));
+}
+
+static void xfrm_byidx_resize(int total)
+{
+	unsigned int hmask = xfrm_idx_hmask;
+	unsigned int nhashmask = xfrm_new_hash_mask(hmask);
+	unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
+	struct hlist_head *oidx = xfrm_policy_byidx;
+	struct hlist_head *nidx = xfrm_hash_alloc(nsize);
+	int i;
+
+	if (!nidx)
+		return;
+
+	write_lock_bh(&xfrm_policy_lock);
+
+	for (i = hmask; i >= 0; i--)
+		xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
+
+	xfrm_policy_byidx = nidx;
+	xfrm_idx_hmask = nhashmask;
+
+	write_unlock_bh(&xfrm_policy_lock);
+
+	xfrm_hash_free(oidx, (hmask + 1) * sizeof(struct hlist_head));
+}
+
+static inline int xfrm_bydst_should_resize(int dir, int *total)
+{
+	unsigned int cnt = xfrm_policy_count[dir];
+	unsigned int hmask = xfrm_policy_bydst[dir].hmask;
+
+	if (total)
+		*total += cnt;
+
+	if ((hmask + 1) < xfrm_policy_hashmax &&
+	    cnt > hmask)
+		return 1;
+
+	return 0;
+}
+
+static inline int xfrm_byidx_should_resize(int total)
+{
+	unsigned int hmask = xfrm_idx_hmask;
+
+	if ((hmask + 1) < xfrm_policy_hashmax &&
+	    total > hmask)
+		return 1;
+
+	return 0;
+}
+
+void xfrm_spd_getinfo(struct xfrmk_spdinfo *si)
+{
+	read_lock_bh(&xfrm_policy_lock);
+	si->incnt = xfrm_policy_count[XFRM_POLICY_IN];
+	si->outcnt = xfrm_policy_count[XFRM_POLICY_OUT];
+	si->fwdcnt = xfrm_policy_count[XFRM_POLICY_FWD];
+	si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
+	si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
+	si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
+	si->spdhcnt = xfrm_idx_hmask;
+	si->spdhmcnt = xfrm_policy_hashmax;
+	read_unlock_bh(&xfrm_policy_lock);
+}
+EXPORT_SYMBOL(xfrm_spd_getinfo);
+
+static DEFINE_MUTEX(hash_resize_mutex);
+static void xfrm_hash_resize(struct work_struct *__unused)
+{
+	int dir, total;
+
+	mutex_lock(&hash_resize_mutex);
+
+	total = 0;
+	for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
+		if (xfrm_bydst_should_resize(dir, &total))
+			xfrm_bydst_resize(dir);
+	}
+	if (xfrm_byidx_should_resize(total))
+		xfrm_byidx_resize(total);
+
+	mutex_unlock(&hash_resize_mutex);
+}
+
+static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize);
+
+/* Generate new index... KAME seems to generate them ordered by cost
+ * of an absolute inpredictability of ordering of rules. This will not pass. */
+static u32 xfrm_gen_index(u8 type, int dir)
+{
+	static u32 idx_generator;
+
+	for (;;) {
+		struct hlist_node *entry;
+		struct hlist_head *list;
+		struct xfrm_policy *p;
+		u32 idx;
+		int found;
+
+		idx = (idx_generator | dir);
+		idx_generator += 8;
+		if (idx == 0)
+			idx = 8;
+		list = xfrm_policy_byidx + idx_hash(idx);
+		found = 0;
+		hlist_for_each_entry(p, entry, list, byidx) {
+			if (p->index == idx) {
+				found = 1;
+				break;
+			}
+		}
+		if (!found)
+			return idx;
+	}
+}
+
+static inline int selector_cmp(struct xfrm_selector *s1, struct xfrm_selector *s2)
+{
+	u32 *p1 = (u32 *) s1;
+	u32 *p2 = (u32 *) s2;
+	int len = sizeof(struct xfrm_selector) / sizeof(u32);
+	int i;
+
+	for (i = 0; i < len; i++) {
+		if (p1[i] != p2[i])
+			return 1;
+	}
+
+	return 0;
+}
+
+int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
+{
+	struct xfrm_policy *pol;
+	struct xfrm_policy *delpol;
+	struct hlist_head *chain;
+	struct hlist_node *entry, *newpos;
+	struct dst_entry *gc_list;
+
+	write_lock_bh(&xfrm_policy_lock);
+	chain = policy_hash_bysel(&policy->selector, policy->family, dir);
+	delpol = NULL;
+	newpos = NULL;
+	hlist_for_each_entry(pol, entry, chain, bydst) {
+		if (pol->type == policy->type &&
+		    !selector_cmp(&pol->selector, &policy->selector) &&
+		    xfrm_sec_ctx_match(pol->security, policy->security) &&
+		    !WARN_ON(delpol)) {
+			if (excl) {
+				write_unlock_bh(&xfrm_policy_lock);
+				return -EEXIST;
+			}
+			delpol = pol;
+			if (policy->priority > pol->priority)
+				continue;
+		} else if (policy->priority >= pol->priority) {
+			newpos = &pol->bydst;
+			continue;
+		}
+		if (delpol)
+			break;
+	}
+	if (newpos)
+		hlist_add_after(newpos, &policy->bydst);
+	else
+		hlist_add_head(&policy->bydst, chain);
+	xfrm_pol_hold(policy);
+	xfrm_policy_count[dir]++;
+	atomic_inc(&flow_cache_genid);
+	if (delpol) {
+		hlist_del(&delpol->bydst);
+		hlist_del(&delpol->byidx);
+		list_del(&delpol->walk.all);
+		xfrm_policy_count[dir]--;
+	}
+	policy->index = delpol ? delpol->index : xfrm_gen_index(policy->type, dir);
+	hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
+	policy->curlft.add_time = get_seconds();
+	policy->curlft.use_time = 0;
+	if (!mod_timer(&policy->timer, jiffies + HZ))
+		xfrm_pol_hold(policy);
+	list_add(&policy->walk.all, &xfrm_policy_all);
+	write_unlock_bh(&xfrm_policy_lock);
+
+	if (delpol)
+		xfrm_policy_kill(delpol);
+	else if (xfrm_bydst_should_resize(dir, NULL))
+		schedule_work(&xfrm_hash_work);
+
+	read_lock_bh(&xfrm_policy_lock);
+	gc_list = NULL;
+	entry = &policy->bydst;
+	hlist_for_each_entry_continue(policy, entry, bydst) {
+		struct dst_entry *dst;
+
+		write_lock(&policy->lock);
+		dst = policy->bundles;
+		if (dst) {
+			struct dst_entry *tail = dst;
+			while (tail->next)
+				tail = tail->next;
+			tail->next = gc_list;
+			gc_list = dst;
+
+			policy->bundles = NULL;
+		}
+		write_unlock(&policy->lock);
+	}
+	read_unlock_bh(&xfrm_policy_lock);
+
+	while (gc_list) {
+		struct dst_entry *dst = gc_list;
+
+		gc_list = dst->next;
+		dst_free(dst);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(xfrm_policy_insert);
+
+struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
+					  struct xfrm_selector *sel,
+					  struct xfrm_sec_ctx *ctx, int delete,
+					  int *err)
+{
+	struct xfrm_policy *pol, *ret;
+	struct hlist_head *chain;
+	struct hlist_node *entry;
+
+	*err = 0;
+	write_lock_bh(&xfrm_policy_lock);
+	chain = policy_hash_bysel(sel, sel->family, dir);
+	ret = NULL;
+	hlist_for_each_entry(pol, entry, chain, bydst) {
+		if (pol->type == type &&
+		    !selector_cmp(sel, &pol->selector) &&
+		    xfrm_sec_ctx_match(ctx, pol->security)) {
+			xfrm_pol_hold(pol);
+			if (delete) {
+				*err = security_xfrm_policy_delete(
+								pol->security);
+				if (*err) {
+					write_unlock_bh(&xfrm_policy_lock);
+					return pol;
+				}
+				hlist_del(&pol->bydst);
+				hlist_del(&pol->byidx);
+				list_del(&pol->walk.all);
+				xfrm_policy_count[dir]--;
+			}
+			ret = pol;
+			break;
+		}
+	}
+	write_unlock_bh(&xfrm_policy_lock);
+
+	if (ret && delete) {
+		atomic_inc(&flow_cache_genid);
+		xfrm_policy_kill(ret);
+	}
+	return ret;
+}
+EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
+
+struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete,
+				     int *err)
+{
+	struct xfrm_policy *pol, *ret;
+	struct hlist_head *chain;
+	struct hlist_node *entry;
+
+	*err = -ENOENT;
+	if (xfrm_policy_id2dir(id) != dir)
+		return NULL;
+
+	*err = 0;
+	write_lock_bh(&xfrm_policy_lock);
+	chain = xfrm_policy_byidx + idx_hash(id);
+	ret = NULL;
+	hlist_for_each_entry(pol, entry, chain, byidx) {
+		if (pol->type == type && pol->index == id) {
+			xfrm_pol_hold(pol);
+			if (delete) {
+				*err = security_xfrm_policy_delete(
+								pol->security);
+				if (*err) {
+					write_unlock_bh(&xfrm_policy_lock);
+					return pol;
+				}
+				hlist_del(&pol->bydst);
+				hlist_del(&pol->byidx);
+				list_del(&pol->walk.all);
+				xfrm_policy_count[dir]--;
+			}
+			ret = pol;
+			break;
+		}
+	}
+	write_unlock_bh(&xfrm_policy_lock);
+
+	if (ret && delete) {
+		atomic_inc(&flow_cache_genid);
+		xfrm_policy_kill(ret);
+	}
+	return ret;
+}
+EXPORT_SYMBOL(xfrm_policy_byid);
+
+#ifdef CONFIG_SECURITY_NETWORK_XFRM
+static inline int
+xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
+{
+	int dir, err = 0;
+
+	for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+		struct xfrm_policy *pol;
+		struct hlist_node *entry;
+		int i;
+
+		hlist_for_each_entry(pol, entry,
+				     &xfrm_policy_inexact[dir], bydst) {
+			if (pol->type != type)
+				continue;
+			err = security_xfrm_policy_delete(pol->security);
+			if (err) {
+				xfrm_audit_policy_delete(pol, 0,
+							 audit_info->loginuid,
+							 audit_info->sessionid,
+							 audit_info->secid);
+				return err;
+			}
+		}
+		for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
+			hlist_for_each_entry(pol, entry,
+					     xfrm_policy_bydst[dir].table + i,
+					     bydst) {
+				if (pol->type != type)
+					continue;
+				err = security_xfrm_policy_delete(
+								pol->security);
+				if (err) {
+					xfrm_audit_policy_delete(pol, 0,
+							audit_info->loginuid,
+							audit_info->sessionid,
+							audit_info->secid);
+					return err;
+				}
+			}
+		}
+	}
+	return err;
+}
+#else
+static inline int
+xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)
+{
+	return 0;
+}
+#endif
+
+int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
+{
+	int dir, err = 0;
+
+	write_lock_bh(&xfrm_policy_lock);
+
+	err = xfrm_policy_flush_secctx_check(type, audit_info);
+	if (err)
+		goto out;
+
+	for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {
+		struct xfrm_policy *pol;
+		struct hlist_node *entry;
+		int i, killed;
+
+		killed = 0;
+	again1:
+		hlist_for_each_entry(pol, entry,
+				     &xfrm_policy_inexact[dir], bydst) {
+			if (pol->type != type)
+				continue;
+			hlist_del(&pol->bydst);
+			hlist_del(&pol->byidx);
+			list_del(&pol->walk.all);
+			write_unlock_bh(&xfrm_policy_lock);
+
+			xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,
+						 audit_info->sessionid,
+						 audit_info->secid);
+
+			xfrm_policy_kill(pol);
+			killed++;
+
+			write_lock_bh(&xfrm_policy_lock);
+			goto again1;
+		}
+
+		for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
+	again2:
+			hlist_for_each_entry(pol, entry,
+					     xfrm_policy_bydst[dir].table + i,
+					     bydst) {
+				if (pol->type != type)
+					continue;
+				hlist_del(&pol->bydst);
+				hlist_del(&pol->byidx);
+				list_del(&pol->walk.all);
+				write_unlock_bh(&xfrm_policy_lock);
+
+				xfrm_audit_policy_delete(pol, 1,
+							 audit_info->loginuid,
+							 audit_info->sessionid,
+							 audit_info->secid);
+				xfrm_policy_kill(pol);
+				killed++;
+
+				write_lock_bh(&xfrm_policy_lock);
+				goto again2;
+			}
+		}
+
+		xfrm_policy_count[dir] -= killed;
+	}
+	atomic_inc(&flow_cache_genid);
+out:
+	write_unlock_bh(&xfrm_policy_lock);
+	return err;
+}
+EXPORT_SYMBOL(xfrm_policy_flush);
+
+int xfrm_policy_walk(struct xfrm_policy_walk *walk,
+		     int (*func)(struct xfrm_policy *, int, int, void*),
+		     void *data)
+{
+	struct xfrm_policy *pol;
+	struct xfrm_policy_walk_entry *x;
+	int error = 0;
+
+	if (walk->type >= XFRM_POLICY_TYPE_MAX &&
+	    walk->type != XFRM_POLICY_TYPE_ANY)
+		return -EINVAL;
+
+	if (list_empty(&walk->walk.all) && walk->seq != 0)
+		return 0;
+
+	write_lock_bh(&xfrm_policy_lock);
+	if (list_empty(&walk->walk.all))
+		x = list_first_entry(&xfrm_policy_all, struct xfrm_policy_walk_entry, all);
+	else
+		x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all);
+	list_for_each_entry_from(x, &xfrm_policy_all, all) {
+		if (x->dead)
+			continue;
+		pol = container_of(x, struct xfrm_policy, walk);
+		if (walk->type != XFRM_POLICY_TYPE_ANY &&
+		    walk->type != pol->type)
+			continue;
+		error = func(pol, xfrm_policy_id2dir(pol->index),
+			     walk->seq, data);
+		if (error) {
+			list_move_tail(&walk->walk.all, &x->all);
+			goto out;
+		}
+		walk->seq++;
+	}
+	if (walk->seq == 0) {
+		error = -ENOENT;
+		goto out;
+	}
+	list_del_init(&walk->walk.all);
+out:
+	write_unlock_bh(&xfrm_policy_lock);
+	return error;
+}
+EXPORT_SYMBOL(xfrm_policy_walk);
+
+void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
+{
+	INIT_LIST_HEAD(&walk->walk.all);
+	walk->walk.dead = 1;
+	walk->type = type;
+	walk->seq = 0;
+}
+EXPORT_SYMBOL(xfrm_policy_walk_init);
+
+void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
+{
+	if (list_empty(&walk->walk.all))
+		return;
+
+	write_lock_bh(&xfrm_policy_lock);
+	list_del(&walk->walk.all);
+	write_unlock_bh(&xfrm_policy_lock);
+}
+EXPORT_SYMBOL(xfrm_policy_walk_done);
+
+/*
+ * Find policy to apply to this flow.
+ *
+ * Returns 0 if policy found, else an -errno.
+ */
+static int xfrm_policy_match(struct xfrm_policy *pol, struct flowi *fl,
+			     u8 type, u16 family, int dir)
+{
+	struct xfrm_selector *sel = &pol->selector;
+	int match, ret = -ESRCH;
+
+	if (pol->family != family ||
+	    pol->type != type)
+		return ret;
+
+	match = xfrm_selector_match(sel, fl, family);
+	if (match)
+		ret = security_xfrm_policy_lookup(pol->security, fl->secid,
+						  dir);
+
+	return ret;
+}
+
+static struct xfrm_policy *xfrm_policy_lookup_bytype(u8 type, struct flowi *fl,
+						     u16 family, u8 dir)
+{
+	int err;
+	struct xfrm_policy *pol, *ret;
+	xfrm_address_t *daddr, *saddr;
+	struct hlist_node *entry;
+	struct hlist_head *chain;
+	u32 priority = ~0U;
+
+	daddr = xfrm_flowi_daddr(fl, family);
+	saddr = xfrm_flowi_saddr(fl, family);
+	if (unlikely(!daddr || !saddr))
+		return NULL;
+
+	read_lock_bh(&xfrm_policy_lock);
+	chain = policy_hash_direct(daddr, saddr, family, dir);
+	ret = NULL;
+	hlist_for_each_entry(pol, entry, chain, bydst) {
+		err = xfrm_policy_match(pol, fl, type, family, dir);
+		if (err) {
+			if (err == -ESRCH)
+				continue;
+			else {
+				ret = ERR_PTR(err);
+				goto fail;
+			}
+		} else {
+			ret = pol;
+			priority = ret->priority;
+			break;
+		}
+	}
+	chain = &xfrm_policy_inexact[dir];
+	hlist_for_each_entry(pol, entry, chain, bydst) {
+		err = xfrm_policy_match(pol, fl, type, family, dir);
+		if (err) {
+			if (err == -ESRCH)
+				continue;
+			else {
+				ret = ERR_PTR(err);
+				goto fail;
+			}
+		} else if (pol->priority < priority) {
+			ret = pol;
+			break;
+		}
+	}
+	if (ret)
+		xfrm_pol_hold(ret);
+fail:
+	read_unlock_bh(&xfrm_policy_lock);
+
+	return ret;
+}
+
+static int xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
+			       void **objp, atomic_t **obj_refp)
+{
+	struct xfrm_policy *pol;
+	int err = 0;
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+	pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_SUB, fl, family, dir);
+	if (IS_ERR(pol)) {
+		err = PTR_ERR(pol);
+		pol = NULL;
+	}
+	if (pol || err)
+		goto end;
+#endif
+	pol = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN, fl, family, dir);
+	if (IS_ERR(pol)) {
+		err = PTR_ERR(pol);
+		pol = NULL;
+	}
+#ifdef CONFIG_XFRM_SUB_POLICY
+end:
+#endif
+	if ((*objp = (void *) pol) != NULL)
+		*obj_refp = &pol->refcnt;
+	return err;
+}
+
+static inline int policy_to_flow_dir(int dir)
+{
+	if (XFRM_POLICY_IN == FLOW_DIR_IN &&
+	    XFRM_POLICY_OUT == FLOW_DIR_OUT &&
+	    XFRM_POLICY_FWD == FLOW_DIR_FWD)
+		return dir;
+	switch (dir) {
+	default:
+	case XFRM_POLICY_IN:
+		return FLOW_DIR_IN;
+	case XFRM_POLICY_OUT:
+		return FLOW_DIR_OUT;
+	case XFRM_POLICY_FWD:
+		return FLOW_DIR_FWD;
+	}
+}
+
+static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
+{
+	struct xfrm_policy *pol;
+
+	read_lock_bh(&xfrm_policy_lock);
+	if ((pol = sk->sk_policy[dir]) != NULL) {
+		int match = xfrm_selector_match(&pol->selector, fl,
+						sk->sk_family);
+		int err = 0;
+
+		if (match) {
+			err = security_xfrm_policy_lookup(pol->security,
+						      fl->secid,
+						      policy_to_flow_dir(dir));
+			if (!err)
+				xfrm_pol_hold(pol);
+			else if (err == -ESRCH)
+				pol = NULL;
+			else
+				pol = ERR_PTR(err);
+		} else
+			pol = NULL;
+	}
+	read_unlock_bh(&xfrm_policy_lock);
+	return pol;
+}
+
+static void __xfrm_policy_link(struct xfrm_policy *pol, int dir)
+{
+	struct hlist_head *chain = policy_hash_bysel(&pol->selector,
+						     pol->family, dir);
+
+	list_add(&pol->walk.all, &xfrm_policy_all);
+	hlist_add_head(&pol->bydst, chain);
+	hlist_add_head(&pol->byidx, xfrm_policy_byidx+idx_hash(pol->index));
+	xfrm_policy_count[dir]++;
+	xfrm_pol_hold(pol);
+
+	if (xfrm_bydst_should_resize(dir, NULL))
+		schedule_work(&xfrm_hash_work);
+}
+
+static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol,
+						int dir)
+{
+	if (hlist_unhashed(&pol->bydst))
+		return NULL;
+
+	hlist_del(&pol->bydst);
+	hlist_del(&pol->byidx);
+	list_del(&pol->walk.all);
+	xfrm_policy_count[dir]--;
+
+	return pol;
+}
+
+int xfrm_policy_delete(struct xfrm_policy *pol, int dir)
+{
+	write_lock_bh(&xfrm_policy_lock);
+	pol = __xfrm_policy_unlink(pol, dir);
+	write_unlock_bh(&xfrm_policy_lock);
+	if (pol) {
+		if (dir < XFRM_POLICY_MAX)
+			atomic_inc(&flow_cache_genid);
+		xfrm_policy_kill(pol);
+		return 0;
+	}
+	return -ENOENT;
+}
+EXPORT_SYMBOL(xfrm_policy_delete);
+
+int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol)
+{
+	struct xfrm_policy *old_pol;
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+	if (pol && pol->type != XFRM_POLICY_TYPE_MAIN)
+		return -EINVAL;
+#endif
+
+	write_lock_bh(&xfrm_policy_lock);
+	old_pol = sk->sk_policy[dir];
+	sk->sk_policy[dir] = pol;
+	if (pol) {
+		pol->curlft.add_time = get_seconds();
+		pol->index = xfrm_gen_index(pol->type, XFRM_POLICY_MAX+dir);
+		__xfrm_policy_link(pol, XFRM_POLICY_MAX+dir);
+	}
+	if (old_pol)
+		__xfrm_policy_unlink(old_pol, XFRM_POLICY_MAX+dir);
+	write_unlock_bh(&xfrm_policy_lock);
+
+	if (old_pol) {
+		xfrm_policy_kill(old_pol);
+	}
+	return 0;
+}
+
+static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
+{
+	struct xfrm_policy *newp = xfrm_policy_alloc(GFP_ATOMIC);
+
+	if (newp) {
+		newp->selector = old->selector;
+		if (security_xfrm_policy_clone(old->security,
+					       &newp->security)) {
+			kfree(newp);
+			return NULL;  /* ENOMEM */
+		}
+		newp->lft = old->lft;
+		newp->curlft = old->curlft;
+		newp->action = old->action;
+		newp->flags = old->flags;
+		newp->xfrm_nr = old->xfrm_nr;
+		newp->index = old->index;
+		newp->type = old->type;
+		memcpy(newp->xfrm_vec, old->xfrm_vec,
+		       newp->xfrm_nr*sizeof(struct xfrm_tmpl));
+		write_lock_bh(&xfrm_policy_lock);
+		__xfrm_policy_link(newp, XFRM_POLICY_MAX+dir);
+		write_unlock_bh(&xfrm_policy_lock);
+		xfrm_pol_put(newp);
+	}
+	return newp;
+}
+
+int __xfrm_sk_clone_policy(struct sock *sk)
+{
+	struct xfrm_policy *p0 = sk->sk_policy[0],
+			   *p1 = sk->sk_policy[1];
+
+	sk->sk_policy[0] = sk->sk_policy[1] = NULL;
+	if (p0 && (sk->sk_policy[0] = clone_policy(p0, 0)) == NULL)
+		return -ENOMEM;
+	if (p1 && (sk->sk_policy[1] = clone_policy(p1, 1)) == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static int
+xfrm_get_saddr(xfrm_address_t *local, xfrm_address_t *remote,
+	       unsigned short family)
+{
+	int err;
+	struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+
+	if (unlikely(afinfo == NULL))
+		return -EINVAL;
+	err = afinfo->get_saddr(local, remote);
+	xfrm_policy_put_afinfo(afinfo);
+	return err;
+}
+
+/* Resolve list of templates for the flow, given policy. */
+
+static int
+xfrm_tmpl_resolve_one(struct xfrm_policy *policy, struct flowi *fl,
+		      struct xfrm_state **xfrm,
+		      unsigned short family)
+{
+	int nx;
+	int i, error;
+	xfrm_address_t *daddr = xfrm_flowi_daddr(fl, family);
+	xfrm_address_t *saddr = xfrm_flowi_saddr(fl, family);
+	xfrm_address_t tmp;
+
+	for (nx=0, i = 0; i < policy->xfrm_nr; i++) {
+		struct xfrm_state *x;
+		xfrm_address_t *remote = daddr;
+		xfrm_address_t *local  = saddr;
+		struct xfrm_tmpl *tmpl = &policy->xfrm_vec[i];
+
+		if (tmpl->mode == XFRM_MODE_TUNNEL ||
+		    tmpl->mode == XFRM_MODE_BEET) {
+			remote = &tmpl->id.daddr;
+			local = &tmpl->saddr;
+			family = tmpl->encap_family;
+			if (xfrm_addr_any(local, family)) {
+				error = xfrm_get_saddr(&tmp, remote, family);
+				if (error)
+					goto fail;
+				local = &tmp;
+			}
+		}
+
+		x = xfrm_state_find(remote, local, fl, tmpl, policy, &error, family);
+
+		if (x && x->km.state == XFRM_STATE_VALID) {
+			xfrm[nx++] = x;
+			daddr = remote;
+			saddr = local;
+			continue;
+		}
+		if (x) {
+			error = (x->km.state == XFRM_STATE_ERROR ?
+				 -EINVAL : -EAGAIN);
+			xfrm_state_put(x);
+		}
+		else if (error == -ESRCH)
+			error = -EAGAIN;
+
+		if (!tmpl->optional)
+			goto fail;
+	}
+	return nx;
+
+fail:
+	for (nx--; nx>=0; nx--)
+		xfrm_state_put(xfrm[nx]);
+	return error;
+}
+
+static int
+xfrm_tmpl_resolve(struct xfrm_policy **pols, int npols, struct flowi *fl,
+		  struct xfrm_state **xfrm,
+		  unsigned short family)
+{
+	struct xfrm_state *tp[XFRM_MAX_DEPTH];
+	struct xfrm_state **tpp = (npols > 1) ? tp : xfrm;
+	int cnx = 0;
+	int error;
+	int ret;
+	int i;
+
+	for (i = 0; i < npols; i++) {
+		if (cnx + pols[i]->xfrm_nr >= XFRM_MAX_DEPTH) {
+			error = -ENOBUFS;
+			goto fail;
+		}
+
+		ret = xfrm_tmpl_resolve_one(pols[i], fl, &tpp[cnx], family);
+		if (ret < 0) {
+			error = ret;
+			goto fail;
+		} else
+			cnx += ret;
+	}
+
+	/* found states are sorted for outbound processing */
+	if (npols > 1)
+		xfrm_state_sort(xfrm, tpp, cnx, family);
+
+	return cnx;
+
+ fail:
+	for (cnx--; cnx>=0; cnx--)
+		xfrm_state_put(tpp[cnx]);
+	return error;
+
+}
+
+/* Check that the bundle accepts the flow and its components are
+ * still valid.
+ */
+
+static struct dst_entry *
+xfrm_find_bundle(struct flowi *fl, struct xfrm_policy *policy, unsigned short family)
+{
+	struct dst_entry *x;
+	struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+	if (unlikely(afinfo == NULL))
+		return ERR_PTR(-EINVAL);
+	x = afinfo->find_bundle(fl, policy);
+	xfrm_policy_put_afinfo(afinfo);
+	return x;
+}
+
+static inline int xfrm_get_tos(struct flowi *fl, int family)
+{
+	struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+	int tos;
+
+	if (!afinfo)
+		return -EINVAL;
+
+	tos = afinfo->get_tos(fl);
+
+	xfrm_policy_put_afinfo(afinfo);
+
+	return tos;
+}
+
+static inline struct xfrm_dst *xfrm_alloc_dst(int family)
+{
+	struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+	struct xfrm_dst *xdst;
+
+	if (!afinfo)
+		return ERR_PTR(-EINVAL);
+
+	xdst = dst_alloc(afinfo->dst_ops) ?: ERR_PTR(-ENOBUFS);
+
+	xfrm_policy_put_afinfo(afinfo);
+
+	return xdst;
+}
+
+static inline int xfrm_init_path(struct xfrm_dst *path, struct dst_entry *dst,
+				 int nfheader_len)
+{
+	struct xfrm_policy_afinfo *afinfo =
+		xfrm_policy_get_afinfo(dst->ops->family);
+	int err;
+
+	if (!afinfo)
+		return -EINVAL;
+
+	err = afinfo->init_path(path, dst, nfheader_len);
+
+	xfrm_policy_put_afinfo(afinfo);
+
+	return err;
+}
+
+static inline int xfrm_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
+{
+	struct xfrm_policy_afinfo *afinfo =
+		xfrm_policy_get_afinfo(xdst->u.dst.ops->family);
+	int err;
+
+	if (!afinfo)
+		return -EINVAL;
+
+	err = afinfo->fill_dst(xdst, dev);
+
+	xfrm_policy_put_afinfo(afinfo);
+
+	return err;
+}
+
+/* Allocate chain of dst_entry's, attach known xfrm's, calculate
+ * all the metrics... Shortly, bundle a bundle.
+ */
+
+static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
+					    struct xfrm_state **xfrm, int nx,
+					    struct flowi *fl,
+					    struct dst_entry *dst)
+{
+	unsigned long now = jiffies;
+	struct net_device *dev;
+	struct dst_entry *dst_prev = NULL;
+	struct dst_entry *dst0 = NULL;
+	int i = 0;
+	int err;
+	int header_len = 0;
+	int nfheader_len = 0;
+	int trailer_len = 0;
+	int tos;
+	int family = policy->selector.family;
+	xfrm_address_t saddr, daddr;
+
+	xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
+
+	tos = xfrm_get_tos(fl, family);
+	err = tos;
+	if (tos < 0)
+		goto put_states;
+
+	dst_hold(dst);
+
+	for (; i < nx; i++) {
+		struct xfrm_dst *xdst = xfrm_alloc_dst(family);
+		struct dst_entry *dst1 = &xdst->u.dst;
+
+		err = PTR_ERR(xdst);
+		if (IS_ERR(xdst)) {
+			dst_release(dst);
+			goto put_states;
+		}
+
+		if (!dst_prev)
+			dst0 = dst1;
+		else {
+			dst_prev->child = dst_clone(dst1);
+			dst1->flags |= DST_NOHASH;
+		}
+
+		xdst->route = dst;
+		memcpy(&dst1->metrics, &dst->metrics, sizeof(dst->metrics));
+
+		if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
+			family = xfrm[i]->props.family;
+			dst = xfrm_dst_lookup(xfrm[i], tos, &saddr, &daddr,
+					      family);
+			err = PTR_ERR(dst);
+			if (IS_ERR(dst))
+				goto put_states;
+		} else
+			dst_hold(dst);
+
+		dst1->xfrm = xfrm[i];
+		xdst->genid = xfrm[i]->genid;
+
+		dst1->obsolete = -1;
+		dst1->flags |= DST_HOST;
+		dst1->lastuse = now;
+
+		dst1->input = dst_discard;
+		dst1->output = xfrm[i]->outer_mode->afinfo->output;
+
+		dst1->next = dst_prev;
+		dst_prev = dst1;
+
+		header_len += xfrm[i]->props.header_len;
+		if (xfrm[i]->type->flags & XFRM_TYPE_NON_FRAGMENT)
+			nfheader_len += xfrm[i]->props.header_len;
+		trailer_len += xfrm[i]->props.trailer_len;
+	}
+
+	dst_prev->child = dst;
+	dst0->path = dst;
+
+	err = -ENODEV;
+	dev = dst->dev;
+	if (!dev)
+		goto free_dst;
+
+	/* Copy neighbout for reachability confirmation */
+	dst0->neighbour = neigh_clone(dst->neighbour);
+
+	xfrm_init_path((struct xfrm_dst *)dst0, dst, nfheader_len);
+	xfrm_init_pmtu(dst_prev);
+
+	for (dst_prev = dst0; dst_prev != dst; dst_prev = dst_prev->child) {
+		struct xfrm_dst *xdst = (struct xfrm_dst *)dst_prev;
+
+		err = xfrm_fill_dst(xdst, dev);
+		if (err)
+			goto free_dst;
+
+		dst_prev->header_len = header_len;
+		dst_prev->trailer_len = trailer_len;
+		header_len -= xdst->u.dst.xfrm->props.header_len;
+		trailer_len -= xdst->u.dst.xfrm->props.trailer_len;
+	}
+
+out:
+	return dst0;
+
+put_states:
+	for (; i < nx; i++)
+		xfrm_state_put(xfrm[i]);
+free_dst:
+	if (dst0)
+		dst_free(dst0);
+	dst0 = ERR_PTR(err);
+	goto out;
+}
+
+static int inline
+xfrm_dst_alloc_copy(void **target, void *src, int size)
+{
+	if (!*target) {
+		*target = kmalloc(size, GFP_ATOMIC);
+		if (!*target)
+			return -ENOMEM;
+	}
+	memcpy(*target, src, size);
+	return 0;
+}
+
+static int inline
+xfrm_dst_update_parent(struct dst_entry *dst, struct xfrm_selector *sel)
+{
+#ifdef CONFIG_XFRM_SUB_POLICY
+	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+	return xfrm_dst_alloc_copy((void **)&(xdst->partner),
+				   sel, sizeof(*sel));
+#else
+	return 0;
+#endif
+}
+
+static int inline
+xfrm_dst_update_origin(struct dst_entry *dst, struct flowi *fl)
+{
+#ifdef CONFIG_XFRM_SUB_POLICY
+	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+	return xfrm_dst_alloc_copy((void **)&(xdst->origin), fl, sizeof(*fl));
+#else
+	return 0;
+#endif
+}
+
+static int stale_bundle(struct dst_entry *dst);
+
+/* Main function: finds/creates a bundle for given flow.
+ *
+ * At the moment we eat a raw IP route. Mostly to speed up lookups
+ * on interfaces with disabled IPsec.
+ */
+int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
+		  struct sock *sk, int flags)
+{
+	struct xfrm_policy *policy;
+	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
+	int npols;
+	int pol_dead;
+	int xfrm_nr;
+	int pi;
+	struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
+	struct dst_entry *dst, *dst_orig = *dst_p;
+	int nx = 0;
+	int err;
+	u32 genid;
+	u16 family;
+	u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
+
+restart:
+	genid = atomic_read(&flow_cache_genid);
+	policy = NULL;
+	for (pi = 0; pi < ARRAY_SIZE(pols); pi++)
+		pols[pi] = NULL;
+	npols = 0;
+	pol_dead = 0;
+	xfrm_nr = 0;
+
+	if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
+		policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
+		err = PTR_ERR(policy);
+		if (IS_ERR(policy)) {
+			XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
+			goto dropdst;
+		}
+	}
+
+	if (!policy) {
+		/* To accelerate a bit...  */
+		if ((dst_orig->flags & DST_NOXFRM) ||
+		    !xfrm_policy_count[XFRM_POLICY_OUT])
+			goto nopol;
+
+		policy = flow_cache_lookup(fl, dst_orig->ops->family,
+					   dir, xfrm_policy_lookup);
+		err = PTR_ERR(policy);
+		if (IS_ERR(policy)) {
+			XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
+			goto dropdst;
+		}
+	}
+
+	if (!policy)
+		goto nopol;
+
+	family = dst_orig->ops->family;
+	pols[0] = policy;
+	npols ++;
+	xfrm_nr += pols[0]->xfrm_nr;
+
+	err = -ENOENT;
+	if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP))
+		goto error;
+
+	policy->curlft.use_time = get_seconds();
+
+	switch (policy->action) {
+	default:
+	case XFRM_POLICY_BLOCK:
+		/* Prohibit the flow */
+		XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
+		err = -EPERM;
+		goto error;
+
+	case XFRM_POLICY_ALLOW:
+#ifndef CONFIG_XFRM_SUB_POLICY
+		if (policy->xfrm_nr == 0) {
+			/* Flow passes not transformed. */
+			xfrm_pol_put(policy);
+			return 0;
+		}
+#endif
+
+		/* Try to find matching bundle.
+		 *
+		 * LATER: help from flow cache. It is optional, this
+		 * is required only for output policy.
+		 */
+		dst = xfrm_find_bundle(fl, policy, family);
+		if (IS_ERR(dst)) {
+			XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
+			err = PTR_ERR(dst);
+			goto error;
+		}
+
+		if (dst)
+			break;
+
+#ifdef CONFIG_XFRM_SUB_POLICY
+		if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
+			pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
+							    fl, family,
+							    XFRM_POLICY_OUT);
+			if (pols[1]) {
+				if (IS_ERR(pols[1])) {
+					XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
+					err = PTR_ERR(pols[1]);
+					goto error;
+				}
+				if (pols[1]->action == XFRM_POLICY_BLOCK) {
+					XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
+					err = -EPERM;
+					goto error;
+				}
+				npols ++;
+				xfrm_nr += pols[1]->xfrm_nr;
+			}
+		}
+
+		/*
+		 * Because neither flowi nor bundle information knows about
+		 * transformation template size. On more than one policy usage
+		 * we can realize whether all of them is bypass or not after
+		 * they are searched. See above not-transformed bypass
+		 * is surrounded by non-sub policy configuration, too.
+		 */
+		if (xfrm_nr == 0) {
+			/* Flow passes not transformed. */
+			xfrm_pols_put(pols, npols);
+			return 0;
+		}
+
+#endif
+		nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
+
+		if (unlikely(nx<0)) {
+			err = nx;
+			if (err == -EAGAIN && sysctl_xfrm_larval_drop) {
+				/* EREMOTE tells the caller to generate
+				 * a one-shot blackhole route.
+				 */
+				XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
+				xfrm_pol_put(policy);
+				return -EREMOTE;
+			}
+			if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {
+				DECLARE_WAITQUEUE(wait, current);
+
+				add_wait_queue(&km_waitq, &wait);
+				set_current_state(TASK_INTERRUPTIBLE);
+				schedule();
+				set_current_state(TASK_RUNNING);
+				remove_wait_queue(&km_waitq, &wait);
+
+				nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
+
+				if (nx == -EAGAIN && signal_pending(current)) {
+					XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
+					err = -ERESTART;
+					goto error;
+				}
+				if (nx == -EAGAIN ||
+				    genid != atomic_read(&flow_cache_genid)) {
+					xfrm_pols_put(pols, npols);
+					goto restart;
+				}
+				err = nx;
+			}
+			if (err < 0) {
+				XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
+				goto error;
+			}
+		}
+		if (nx == 0) {
+			/* Flow passes not transformed. */
+			xfrm_pols_put(pols, npols);
+			return 0;
+		}
+
+		dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig);
+		err = PTR_ERR(dst);
+		if (IS_ERR(dst)) {
+			XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR);
+			goto error;
+		}
+
+		for (pi = 0; pi < npols; pi++) {
+			read_lock_bh(&pols[pi]->lock);
+			pol_dead |= pols[pi]->walk.dead;
+			read_unlock_bh(&pols[pi]->lock);
+		}
+
+		write_lock_bh(&policy->lock);
+		if (unlikely(pol_dead || stale_bundle(dst))) {
+			/* Wow! While we worked on resolving, this
+			 * policy has gone. Retry. It is not paranoia,
+			 * we just cannot enlist new bundle to dead object.
+			 * We can't enlist stable bundles either.
+			 */
+			write_unlock_bh(&policy->lock);
+			dst_free(dst);
+
+			if (pol_dead)
+				XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD);
+			else
+				XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
+			err = -EHOSTUNREACH;
+			goto error;
+		}
+
+		if (npols > 1)
+			err = xfrm_dst_update_parent(dst, &pols[1]->selector);
+		else
+			err = xfrm_dst_update_origin(dst, fl);
+		if (unlikely(err)) {
+			write_unlock_bh(&policy->lock);
+			dst_free(dst);
+			XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
+			goto error;
+		}
+
+		dst->next = policy->bundles;
+		policy->bundles = dst;
+		dst_hold(dst);
+		write_unlock_bh(&policy->lock);
+	}
+	*dst_p = dst;
+	dst_release(dst_orig);
+	xfrm_pols_put(pols, npols);
+	return 0;
+
+error:
+	xfrm_pols_put(pols, npols);
+dropdst:
+	dst_release(dst_orig);
+	*dst_p = NULL;
+	return err;
+
+nopol:
+	err = -ENOENT;
+	if (flags & XFRM_LOOKUP_ICMP)
+		goto dropdst;
+	return 0;
+}
+EXPORT_SYMBOL(__xfrm_lookup);
+
+int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
+		struct sock *sk, int flags)
+{
+	int err = __xfrm_lookup(dst_p, fl, sk, flags);
+
+	if (err == -EREMOTE) {
+		dst_release(*dst_p);
+		*dst_p = NULL;
+		err = -EAGAIN;
+	}
+
+	return err;
+}
+EXPORT_SYMBOL(xfrm_lookup);
+
+static inline int
+xfrm_secpath_reject(int idx, struct sk_buff *skb, struct flowi *fl)
+{
+	struct xfrm_state *x;
+
+	if (!skb->sp || idx < 0 || idx >= skb->sp->len)
+		return 0;
+	x = skb->sp->xvec[idx];
+	if (!x->type->reject)
+		return 0;
+	return x->type->reject(x, skb, fl);
+}
+
+/* When skb is transformed back to its "native" form, we have to
+ * check policy restrictions. At the moment we make this in maximally
+ * stupid way. Shame on me. :-) Of course, connected sockets must
+ * have policy cached at them.
+ */
+
+static inline int
+xfrm_state_ok(struct xfrm_tmpl *tmpl, struct xfrm_state *x,
+	      unsigned short family)
+{
+	if (xfrm_state_kern(x))
+		return tmpl->optional && !xfrm_state_addr_cmp(tmpl, x, tmpl->encap_family);
+	return	x->id.proto == tmpl->id.proto &&
+		(x->id.spi == tmpl->id.spi || !tmpl->id.spi) &&
+		(x->props.reqid == tmpl->reqid || !tmpl->reqid) &&
+		x->props.mode == tmpl->mode &&
+		(tmpl->allalgs || (tmpl->aalgos & (1<<x->props.aalgo)) ||
+		 !(xfrm_id_proto_match(tmpl->id.proto, IPSEC_PROTO_ANY))) &&
+		!(x->props.mode != XFRM_MODE_TRANSPORT &&
+		  xfrm_state_addr_cmp(tmpl, x, family));
+}
+
+/*
+ * 0 or more than 0 is returned when validation is succeeded (either bypass
+ * because of optional transport mode, or next index of the mathced secpath
+ * state with the template.
+ * -1 is returned when no matching template is found.
+ * Otherwise "-2 - errored_index" is returned.
+ */
+static inline int
+xfrm_policy_ok(struct xfrm_tmpl *tmpl, struct sec_path *sp, int start,
+	       unsigned short family)
+{
+	int idx = start;
+
+	if (tmpl->optional) {
+		if (tmpl->mode == XFRM_MODE_TRANSPORT)
+			return start;
+	} else
+		start = -1;
+	for (; idx < sp->len; idx++) {
+		if (xfrm_state_ok(tmpl, sp->xvec[idx], family))
+			return ++idx;
+		if (sp->xvec[idx]->props.mode != XFRM_MODE_TRANSPORT) {
+			if (start == -1)
+				start = -2-idx;
+			break;
+		}
+	}
+	return start;
+}
+
+int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
+			  unsigned int family, int reverse)
+{
+	struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
+	int err;
+
+	if (unlikely(afinfo == NULL))
+		return -EAFNOSUPPORT;
+
+	afinfo->decode_session(skb, fl, reverse);
+	err = security_xfrm_decode_session(skb, &fl->secid);
+	xfrm_policy_put_afinfo(afinfo);
+	return err;
+}
+EXPORT_SYMBOL(__xfrm_decode_session);
+
+static inline int secpath_has_nontransport(struct sec_path *sp, int k, int *idxp)
+{
+	for (; k < sp->len; k++) {
+		if (sp->xvec[k]->props.mode != XFRM_MODE_TRANSPORT) {
+			*idxp = k;
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
+			unsigned short family)
+{
+	struct xfrm_policy *pol;
+	struct xfrm_policy *pols[XFRM_POLICY_TYPE_MAX];
+	int npols = 0;
+	int xfrm_nr;
+	int pi;
+	int reverse;
+	struct flowi fl;
+	u8 fl_dir;
+	int xerr_idx = -1;
+
+	reverse = dir & ~XFRM_POLICY_MASK;
+	dir &= XFRM_POLICY_MASK;
+	fl_dir = policy_to_flow_dir(dir);
+
+	if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
+		XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
+		return 0;
+	}
+
+	nf_nat_decode_session(skb, &fl, family);
+
+	/* First, check used SA against their selectors. */
+	if (skb->sp) {
+		int i;
+
+		for (i=skb->sp->len-1; i>=0; i--) {
+			struct xfrm_state *x = skb->sp->xvec[i];
+			if (!xfrm_selector_match(&x->sel, &fl, family)) {
+				XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH);
+				return 0;
+			}
+		}
+	}
+
+	pol = NULL;
+	if (sk && sk->sk_policy[dir]) {
+		pol = xfrm_sk_policy_lookup(sk, dir, &fl);
+		if (IS_ERR(pol)) {
+			XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
+			return 0;
+		}
+	}
+
+	if (!pol)
+		pol = flow_cache_lookup(&fl, family, fl_dir,
+					xfrm_policy_lookup);
+
+	if (IS_ERR(pol)) {
+		XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
+		return 0;
+	}
+
+	if (!pol) {
+		if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
+			xfrm_secpath_reject(xerr_idx, skb, &fl);
+			XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS);
+			return 0;
+		}
+		return 1;
+	}
+
+	pol->curlft.use_time = get_seconds();
+
+	pols[0] = pol;
+	npols ++;
+#ifdef CONFIG_XFRM_SUB_POLICY
+	if (pols[0]->type != XFRM_POLICY_TYPE_MAIN) {
+		pols[1] = xfrm_policy_lookup_bytype(XFRM_POLICY_TYPE_MAIN,
+						    &fl, family,
+						    XFRM_POLICY_IN);
+		if (pols[1]) {
+			if (IS_ERR(pols[1])) {
+				XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
+				return 0;
+			}
+			pols[1]->curlft.use_time = get_seconds();
+			npols ++;
+		}
+	}
+#endif
+
+	if (pol->action == XFRM_POLICY_ALLOW) {
+		struct sec_path *sp;
+		static struct sec_path dummy;
+		struct xfrm_tmpl *tp[XFRM_MAX_DEPTH];
+		struct xfrm_tmpl *stp[XFRM_MAX_DEPTH];
+		struct xfrm_tmpl **tpp = tp;
+		int ti = 0;
+		int i, k;
+
+		if ((sp = skb->sp) == NULL)
+			sp = &dummy;
+
+		for (pi = 0; pi < npols; pi++) {
+			if (pols[pi] != pol &&
+			    pols[pi]->action != XFRM_POLICY_ALLOW) {
+				XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
+				goto reject;
+			}
+			if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
+				XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
+				goto reject_error;
+			}
+			for (i = 0; i < pols[pi]->xfrm_nr; i++)
+				tpp[ti++] = &pols[pi]->xfrm_vec[i];
+		}
+		xfrm_nr = ti;
+		if (npols > 1) {
+			xfrm_tmpl_sort(stp, tpp, xfrm_nr, family);
+			tpp = stp;
+		}
+
+		/* For each tunnel xfrm, find the first matching tmpl.
+		 * For each tmpl before that, find corresponding xfrm.
+		 * Order is _important_. Later we will implement
+		 * some barriers, but at the moment barriers
+		 * are implied between each two transformations.
+		 */
+		for (i = xfrm_nr-1, k = 0; i >= 0; i--) {
+			k = xfrm_policy_ok(tpp[i], sp, k, family);
+			if (k < 0) {
+				if (k < -1)
+					/* "-2 - errored_index" returned */
+					xerr_idx = -(2+k);
+				XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
+				goto reject;
+			}
+		}
+
+		if (secpath_has_nontransport(sp, k, &xerr_idx)) {
+			XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
+			goto reject;
+		}
+
+		xfrm_pols_put(pols, npols);
+		return 1;
+	}
+	XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
+
+reject:
+	xfrm_secpath_reject(xerr_idx, skb, &fl);
+reject_error:
+	xfrm_pols_put(pols, npols);
+	return 0;
+}
+EXPORT_SYMBOL(__xfrm_policy_check);
+
+int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
+{
+	struct flowi fl;
+
+	if (xfrm_decode_session(skb, &fl, family) < 0) {
+		/* XXX: we should have something like FWDHDRERROR here. */
+		XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
+		return 0;
+	}
+
+	return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
+}
+EXPORT_SYMBOL(__xfrm_route_forward);
+
+/* Optimize later using cookies and generation ids. */
+
+static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
+{
+	/* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
+	 * to "-1" to force all XFRM destinations to get validated by
+	 * dst_ops->check on every use.  We do this because when a
+	 * normal route referenced by an XFRM dst is obsoleted we do
+	 * not go looking around for all parent referencing XFRM dsts
+	 * so that we can invalidate them.  It is just too much work.
+	 * Instead we make the checks here on every use.  For example:
+	 *
+	 *	XFRM dst A --> IPv4 dst X
+	 *
+	 * X is the "xdst->route" of A (X is also the "dst->path" of A
+	 * in this example).  If X is marked obsolete, "A" will not
+	 * notice.  That's what we are validating here via the
+	 * stale_bundle() check.
+	 *
+	 * When a policy's bundle is pruned, we dst_free() the XFRM
+	 * dst which causes it's ->obsolete field to be set to a
+	 * positive non-zero integer.  If an XFRM dst has been pruned
+	 * like this, we want to force a new route lookup.
+	 */
+	if (dst->obsolete < 0 && !stale_bundle(dst))
+		return dst;
+
+	return NULL;
+}
+
+static int stale_bundle(struct dst_entry *dst)
+{
+	return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
+}
+
+void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
+{
+	while ((dst = dst->child) && dst->xfrm && dst->dev == dev) {
+		dst->dev = dev_net(dev)->loopback_dev;
+		dev_hold(dst->dev);
+		dev_put(dev);
+	}
+}
+EXPORT_SYMBOL(xfrm_dst_ifdown);
+
+static void xfrm_link_failure(struct sk_buff *skb)
+{
+	/* Impossible. Such dst must be popped before reaches point of failure. */
+	return;
+}
+
+static struct dst_entry *xfrm_negative_advice(struct dst_entry *dst)
+{
+	if (dst) {
+		if (dst->obsolete) {
+			dst_release(dst);
+			dst = NULL;
+		}
+	}
+	return dst;
+}
+
+static void prune_one_bundle(struct xfrm_policy *pol, int (*func)(struct dst_entry *), struct dst_entry **gc_list_p)
+{
+	struct dst_entry *dst, **dstp;
+
+	write_lock(&pol->lock);
+	dstp = &pol->bundles;
+	while ((dst=*dstp) != NULL) {
+		if (func(dst)) {
+			*dstp = dst->next;
+			dst->next = *gc_list_p;
+			*gc_list_p = dst;
+		} else {
+			dstp = &dst->next;
+		}
+	}
+	write_unlock(&pol->lock);
+}
+
+static void xfrm_prune_bundles(int (*func)(struct dst_entry *))
+{
+	struct dst_entry *gc_list = NULL;
+	int dir;
+
+	read_lock_bh(&xfrm_policy_lock);
+	for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
+		struct xfrm_policy *pol;
+		struct hlist_node *entry;
+		struct hlist_head *table;
+		int i;
+
+		hlist_for_each_entry(pol, entry,
+				     &xfrm_policy_inexact[dir], bydst)
+			prune_one_bundle(pol, func, &gc_list);
+
+		table = xfrm_policy_bydst[dir].table;
+		for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {
+			hlist_for_each_entry(pol, entry, table + i, bydst)
+				prune_one_bundle(pol, func, &gc_list);
+		}
+	}
+	read_unlock_bh(&xfrm_policy_lock);
+
+	while (gc_list) {
+		struct dst_entry *dst = gc_list;
+		gc_list = dst->next;
+		dst_free(dst);
+	}
+}
+
+static int unused_bundle(struct dst_entry *dst)
+{
+	return !atomic_read(&dst->__refcnt);
+}
+
+static void __xfrm_garbage_collect(void)
+{
+	xfrm_prune_bundles(unused_bundle);
+}
+
+static int xfrm_flush_bundles(void)
+{
+	xfrm_prune_bundles(stale_bundle);
+	return 0;
+}
+
+static void xfrm_init_pmtu(struct dst_entry *dst)
+{
+	do {
+		struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+		u32 pmtu, route_mtu_cached;
+
+		pmtu = dst_mtu(dst->child);
+		xdst->child_mtu_cached = pmtu;
+
+		pmtu = xfrm_state_mtu(dst->xfrm, pmtu);
+
+		route_mtu_cached = dst_mtu(xdst->route);
+		xdst->route_mtu_cached = route_mtu_cached;
+
+		if (pmtu > route_mtu_cached)
+			pmtu = route_mtu_cached;
+
+		dst->metrics[RTAX_MTU-1] = pmtu;
+	} while ((dst = dst->next));
+}
+
+/* Check that the bundle accepts the flow and its components are
+ * still valid.
+ */
+
+int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
+		struct flowi *fl, int family, int strict)
+{
+	struct dst_entry *dst = &first->u.dst;
+	struct xfrm_dst *last;
+	u32 mtu;
+
+	if (!dst_check(dst->path, ((struct xfrm_dst *)dst)->path_cookie) ||
+	    (dst->dev && !netif_running(dst->dev)))
+		return 0;
+#ifdef CONFIG_XFRM_SUB_POLICY
+	if (fl) {
+		if (first->origin && !flow_cache_uli_match(first->origin, fl))
+			return 0;
+		if (first->partner &&
+		    !xfrm_selector_match(first->partner, fl, family))
+			return 0;
+	}
+#endif
+
+	last = NULL;
+
+	do {
+		struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+
+		if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
+			return 0;
+		if (fl && pol &&
+		    !security_xfrm_state_pol_flow_match(dst->xfrm, pol, fl))
+			return 0;
+		if (dst->xfrm->km.state != XFRM_STATE_VALID)
+			return 0;
+		if (xdst->genid != dst->xfrm->genid)
+			return 0;
+
+		if (strict && fl &&
+		    !(dst->xfrm->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
+		    !xfrm_state_addr_flow_check(dst->xfrm, fl, family))
+			return 0;
+
+		mtu = dst_mtu(dst->child);
+		if (xdst->child_mtu_cached != mtu) {
+			last = xdst;
+			xdst->child_mtu_cached = mtu;
+		}
+
+		if (!dst_check(xdst->route, xdst->route_cookie))
+			return 0;
+		mtu = dst_mtu(xdst->route);
+		if (xdst->route_mtu_cached != mtu) {
+			last = xdst;
+			xdst->route_mtu_cached = mtu;
+		}
+
+		dst = dst->child;
+	} while (dst->xfrm);
+
+	if (likely(!last))
+		return 1;
+
+	mtu = last->child_mtu_cached;
+	for (;;) {
+		dst = &last->u.dst;
+
+		mtu = xfrm_state_mtu(dst->xfrm, mtu);
+		if (mtu > last->route_mtu_cached)
+			mtu = last->route_mtu_cached;
+		dst->metrics[RTAX_MTU-1] = mtu;
+
+		if (last == first)
+			break;
+
+		last = (struct xfrm_dst *)last->u.dst.next;
+		last->child_mtu_cached = mtu;
+	}
+
+	return 1;
+}
+
+EXPORT_SYMBOL(xfrm_bundle_ok);
+
+int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
+{
+	int err = 0;
+	if (unlikely(afinfo == NULL))
+		return -EINVAL;
+	if (unlikely(afinfo->family >= NPROTO))
+		return -EAFNOSUPPORT;
+	write_lock_bh(&xfrm_policy_afinfo_lock);
+	if (unlikely(xfrm_policy_afinfo[afinfo->family] != NULL))
+		err = -ENOBUFS;
+	else {
+		struct dst_ops *dst_ops = afinfo->dst_ops;
+		if (likely(dst_ops->kmem_cachep == NULL))
+			dst_ops->kmem_cachep = xfrm_dst_cache;
+		if (likely(dst_ops->check == NULL))
+			dst_ops->check = xfrm_dst_check;
+		if (likely(dst_ops->negative_advice == NULL))
+			dst_ops->negative_advice = xfrm_negative_advice;
+		if (likely(dst_ops->link_failure == NULL))
+			dst_ops->link_failure = xfrm_link_failure;
+		if (likely(afinfo->garbage_collect == NULL))
+			afinfo->garbage_collect = __xfrm_garbage_collect;
+		xfrm_policy_afinfo[afinfo->family] = afinfo;
+	}
+	write_unlock_bh(&xfrm_policy_afinfo_lock);
+	return err;
+}
+EXPORT_SYMBOL(xfrm_policy_register_afinfo);
+
+int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo)
+{
+	int err = 0;
+	if (unlikely(afinfo == NULL))
+		return -EINVAL;
+	if (unlikely(afinfo->family >= NPROTO))
+		return -EAFNOSUPPORT;
+	write_lock_bh(&xfrm_policy_afinfo_lock);
+	if (likely(xfrm_policy_afinfo[afinfo->family] != NULL)) {
+		if (unlikely(xfrm_policy_afinfo[afinfo->family] != afinfo))
+			err = -EINVAL;
+		else {
+			struct dst_ops *dst_ops = afinfo->dst_ops;
+			xfrm_policy_afinfo[afinfo->family] = NULL;
+			dst_ops->kmem_cachep = NULL;
+			dst_ops->check = NULL;
+			dst_ops->negative_advice = NULL;
+			dst_ops->link_failure = NULL;
+			afinfo->garbage_collect = NULL;
+		}
+	}
+	write_unlock_bh(&xfrm_policy_afinfo_lock);
+	return err;
+}
+EXPORT_SYMBOL(xfrm_policy_unregister_afinfo);
+
+static struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short family)
+{
+	struct xfrm_policy_afinfo *afinfo;
+	if (unlikely(family >= NPROTO))
+		return NULL;
+	read_lock(&xfrm_policy_afinfo_lock);
+	afinfo = xfrm_policy_afinfo[family];
+	if (unlikely(!afinfo))
+		read_unlock(&xfrm_policy_afinfo_lock);
+	return afinfo;
+}
+
+static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo *afinfo)
+{
+	read_unlock(&xfrm_policy_afinfo_lock);
+}
+
+static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	struct net_device *dev = ptr;
+
+	if (!net_eq(dev_net(dev), &init_net))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_DOWN:
+		xfrm_flush_bundles();
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block xfrm_dev_notifier = {
+	xfrm_dev_event,
+	NULL,
+	0
+};
+
+#ifdef CONFIG_XFRM_STATISTICS
+static int __init xfrm_statistics_init(void)
+{
+	if (snmp_mib_init((void **)xfrm_statistics,
+			  sizeof(struct linux_xfrm_mib)) < 0)
+		return -ENOMEM;
+	return 0;
+}
+#endif
+
+static void __init xfrm_policy_init(void)
+{
+	unsigned int hmask, sz;
+	int dir;
+
+	xfrm_dst_cache = kmem_cache_create("xfrm_dst_cache",
+					   sizeof(struct xfrm_dst),
+					   0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
+					   NULL);
+
+	hmask = 8 - 1;
+	sz = (hmask+1) * sizeof(struct hlist_head);
+
+	xfrm_policy_byidx = xfrm_hash_alloc(sz);
+	xfrm_idx_hmask = hmask;
+	if (!xfrm_policy_byidx)
+		panic("XFRM: failed to allocate byidx hash\n");
+
+	for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
+		struct xfrm_policy_hash *htab;
+
+		INIT_HLIST_HEAD(&xfrm_policy_inexact[dir]);
+
+		htab = &xfrm_policy_bydst[dir];
+		htab->table = xfrm_hash_alloc(sz);
+		htab->hmask = hmask;
+		if (!htab->table)
+			panic("XFRM: failed to allocate bydst hash\n");
+	}
+
+	INIT_LIST_HEAD(&xfrm_policy_all);
+	INIT_WORK(&xfrm_policy_gc_work, xfrm_policy_gc_task);
+	register_netdevice_notifier(&xfrm_dev_notifier);
+}
+
+void __init xfrm_init(void)
+{
+#ifdef CONFIG_XFRM_STATISTICS
+	xfrm_statistics_init();
+#endif
+	xfrm_state_init();
+	xfrm_policy_init();
+	xfrm_input_init();
+#ifdef CONFIG_XFRM_STATISTICS
+	xfrm_proc_init();
+#endif
+}
+
+#ifdef CONFIG_AUDITSYSCALL
+static void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,
+					 struct audit_buffer *audit_buf)
+{
+	struct xfrm_sec_ctx *ctx = xp->security;
+	struct xfrm_selector *sel = &xp->selector;
+
+	if (ctx)
+		audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
+				 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
+
+	switch(sel->family) {
+	case AF_INET:
+		audit_log_format(audit_buf, " src=" NIPQUAD_FMT,
+				 NIPQUAD(sel->saddr.a4));
+		if (sel->prefixlen_s != 32)
+			audit_log_format(audit_buf, " src_prefixlen=%d",
+					 sel->prefixlen_s);
+		audit_log_format(audit_buf, " dst=" NIPQUAD_FMT,
+				 NIPQUAD(sel->daddr.a4));
+		if (sel->prefixlen_d != 32)
+			audit_log_format(audit_buf, " dst_prefixlen=%d",
+					 sel->prefixlen_d);
+		break;
+	case AF_INET6:
+		audit_log_format(audit_buf, " src=" NIP6_FMT,
+				 NIP6(*(struct in6_addr *)sel->saddr.a6));
+		if (sel->prefixlen_s != 128)
+			audit_log_format(audit_buf, " src_prefixlen=%d",
+					 sel->prefixlen_s);
+		audit_log_format(audit_buf, " dst=" NIP6_FMT,
+				 NIP6(*(struct in6_addr *)sel->daddr.a6));
+		if (sel->prefixlen_d != 128)
+			audit_log_format(audit_buf, " dst_prefixlen=%d",
+					 sel->prefixlen_d);
+		break;
+	}
+}
+
+void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
+			   uid_t auid, u32 sessionid, u32 secid)
+{
+	struct audit_buffer *audit_buf;
+
+	audit_buf = xfrm_audit_start("SPD-add");
+	if (audit_buf == NULL)
+		return;
+	xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
+	audit_log_format(audit_buf, " res=%u", result);
+	xfrm_audit_common_policyinfo(xp, audit_buf);
+	audit_log_end(audit_buf);
+}
+EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);
+
+void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
+			      uid_t auid, u32 sessionid, u32 secid)
+{
+	struct audit_buffer *audit_buf;
+
+	audit_buf = xfrm_audit_start("SPD-delete");
+	if (audit_buf == NULL)
+		return;
+	xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
+	audit_log_format(audit_buf, " res=%u", result);
+	xfrm_audit_common_policyinfo(xp, audit_buf);
+	audit_log_end(audit_buf);
+}
+EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);
+#endif
+
+#ifdef CONFIG_XFRM_MIGRATE
+static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,
+				       struct xfrm_selector *sel_tgt)
+{
+	if (sel_cmp->proto == IPSEC_ULPROTO_ANY) {
+		if (sel_tgt->family == sel_cmp->family &&
+		    xfrm_addr_cmp(&sel_tgt->daddr, &sel_cmp->daddr,
+				  sel_cmp->family) == 0 &&
+		    xfrm_addr_cmp(&sel_tgt->saddr, &sel_cmp->saddr,
+				  sel_cmp->family) == 0 &&
+		    sel_tgt->prefixlen_d == sel_cmp->prefixlen_d &&
+		    sel_tgt->prefixlen_s == sel_cmp->prefixlen_s) {
+			return 1;
+		}
+	} else {
+		if (memcmp(sel_tgt, sel_cmp, sizeof(*sel_tgt)) == 0) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static struct xfrm_policy * xfrm_migrate_policy_find(struct xfrm_selector *sel,
+						     u8 dir, u8 type)
+{
+	struct xfrm_policy *pol, *ret = NULL;
+	struct hlist_node *entry;
+	struct hlist_head *chain;
+	u32 priority = ~0U;
+
+	read_lock_bh(&xfrm_policy_lock);
+	chain = policy_hash_direct(&sel->daddr, &sel->saddr, sel->family, dir);
+	hlist_for_each_entry(pol, entry, chain, bydst) {
+		if (xfrm_migrate_selector_match(sel, &pol->selector) &&
+		    pol->type == type) {
+			ret = pol;
+			priority = ret->priority;
+			break;
+		}
+	}
+	chain = &xfrm_policy_inexact[dir];
+	hlist_for_each_entry(pol, entry, chain, bydst) {
+		if (xfrm_migrate_selector_match(sel, &pol->selector) &&
+		    pol->type == type &&
+		    pol->priority < priority) {
+			ret = pol;
+			break;
+		}
+	}
+
+	if (ret)
+		xfrm_pol_hold(ret);
+
+	read_unlock_bh(&xfrm_policy_lock);
+
+	return ret;
+}
+
+static int migrate_tmpl_match(struct xfrm_migrate *m, struct xfrm_tmpl *t)
+{
+	int match = 0;
+
+	if (t->mode == m->mode && t->id.proto == m->proto &&
+	    (m->reqid == 0 || t->reqid == m->reqid)) {
+		switch (t->mode) {
+		case XFRM_MODE_TUNNEL:
+		case XFRM_MODE_BEET:
+			if (xfrm_addr_cmp(&t->id.daddr, &m->old_daddr,
+					  m->old_family) == 0 &&
+			    xfrm_addr_cmp(&t->saddr, &m->old_saddr,
+					  m->old_family) == 0) {
+				match = 1;
+			}
+			break;
+		case XFRM_MODE_TRANSPORT:
+			/* in case of transport mode, template does not store
+			   any IP addresses, hence we just compare mode and
+			   protocol */
+			match = 1;
+			break;
+		default:
+			break;
+		}
+	}
+	return match;
+}
+
+/* update endpoint address(es) of template(s) */
+static int xfrm_policy_migrate(struct xfrm_policy *pol,
+			       struct xfrm_migrate *m, int num_migrate)
+{
+	struct xfrm_migrate *mp;
+	struct dst_entry *dst;
+	int i, j, n = 0;
+
+	write_lock_bh(&pol->lock);
+	if (unlikely(pol->walk.dead)) {
+		/* target policy has been deleted */
+		write_unlock_bh(&pol->lock);
+		return -ENOENT;
+	}
+
+	for (i = 0; i < pol->xfrm_nr; i++) {
+		for (j = 0, mp = m; j < num_migrate; j++, mp++) {
+			if (!migrate_tmpl_match(mp, &pol->xfrm_vec[i]))
+				continue;
+			n++;
+			if (pol->xfrm_vec[i].mode != XFRM_MODE_TUNNEL &&
+			    pol->xfrm_vec[i].mode != XFRM_MODE_BEET)
+				continue;
+			/* update endpoints */
+			memcpy(&pol->xfrm_vec[i].id.daddr, &mp->new_daddr,
+			       sizeof(pol->xfrm_vec[i].id.daddr));
+			memcpy(&pol->xfrm_vec[i].saddr, &mp->new_saddr,
+			       sizeof(pol->xfrm_vec[i].saddr));
+			pol->xfrm_vec[i].encap_family = mp->new_family;
+			/* flush bundles */
+			while ((dst = pol->bundles) != NULL) {
+				pol->bundles = dst->next;
+				dst_free(dst);
+			}
+		}
+	}
+
+	write_unlock_bh(&pol->lock);
+
+	if (!n)
+		return -ENODATA;
+
+	return 0;
+}
+
+static int xfrm_migrate_check(struct xfrm_migrate *m, int num_migrate)
+{
+	int i, j;
+
+	if (num_migrate < 1 || num_migrate > XFRM_MAX_DEPTH)
+		return -EINVAL;
+
+	for (i = 0; i < num_migrate; i++) {
+		if ((xfrm_addr_cmp(&m[i].old_daddr, &m[i].new_daddr,
+				   m[i].old_family) == 0) &&
+		    (xfrm_addr_cmp(&m[i].old_saddr, &m[i].new_saddr,
+				   m[i].old_family) == 0))
+			return -EINVAL;
+		if (xfrm_addr_any(&m[i].new_daddr, m[i].new_family) ||
+		    xfrm_addr_any(&m[i].new_saddr, m[i].new_family))
+			return -EINVAL;
+
+		/* check if there is any duplicated entry */
+		for (j = i + 1; j < num_migrate; j++) {
+			if (!memcmp(&m[i].old_daddr, &m[j].old_daddr,
+				    sizeof(m[i].old_daddr)) &&
+			    !memcmp(&m[i].old_saddr, &m[j].old_saddr,
+				    sizeof(m[i].old_saddr)) &&
+			    m[i].proto == m[j].proto &&
+			    m[i].mode == m[j].mode &&
+			    m[i].reqid == m[j].reqid &&
+			    m[i].old_family == m[j].old_family)
+				return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
+		 struct xfrm_migrate *m, int num_migrate,
+		 struct xfrm_kmaddress *k)
+{
+	int i, err, nx_cur = 0, nx_new = 0;
+	struct xfrm_policy *pol = NULL;
+	struct xfrm_state *x, *xc;
+	struct xfrm_state *x_cur[XFRM_MAX_DEPTH];
+	struct xfrm_state *x_new[XFRM_MAX_DEPTH];
+	struct xfrm_migrate *mp;
+
+	if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
+		goto out;
+
+	/* Stage 1 - find policy */
+	if ((pol = xfrm_migrate_policy_find(sel, dir, type)) == NULL) {
+		err = -ENOENT;
+		goto out;
+	}
+
+	/* Stage 2 - find and update state(s) */
+	for (i = 0, mp = m; i < num_migrate; i++, mp++) {
+		if ((x = xfrm_migrate_state_find(mp))) {
+			x_cur[nx_cur] = x;
+			nx_cur++;
+			if ((xc = xfrm_state_migrate(x, mp))) {
+				x_new[nx_new] = xc;
+				nx_new++;
+			} else {
+				err = -ENODATA;
+				goto restore_state;
+			}
+		}
+	}
+
+	/* Stage 3 - update policy */
+	if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
+		goto restore_state;
+
+	/* Stage 4 - delete old state(s) */
+	if (nx_cur) {
+		xfrm_states_put(x_cur, nx_cur);
+		xfrm_states_delete(x_cur, nx_cur);
+	}
+
+	/* Stage 5 - announce */
+	km_migrate(sel, dir, type, m, num_migrate, k);
+
+	xfrm_pol_put(pol);
+
+	return 0;
+out:
+	return err;
+
+restore_state:
+	if (pol)
+		xfrm_pol_put(pol);
+	if (nx_cur)
+		xfrm_states_put(x_cur, nx_cur);
+	if (nx_new)
+		xfrm_states_delete(x_new, nx_new);
+
+	return err;
+}
+EXPORT_SYMBOL(xfrm_migrate);
+#endif