Linux-2.6.12-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, 1037 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
new file mode 100644
index 00000000000..1db59f11f37
--- /dev/null
+++ b/net/xfrm/xfrm_state.c
@@ -0,0 +1,1037 @@
+/*
+ * xfrm_state.c
+ *
+ * Changes:
+ *	Mitsuru KANDA @USAGI
+ * 	Kazunori MIYAZAWA @USAGI
+ * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
+ * 		IPv6 support
+ * 	YOSHIFUJI Hideaki @USAGI
+ * 		Split up af-specific functions
+ *	Derek Atkins <derek@ihtfp.com>
+ *		Add UDP Encapsulation
+ * 	
+ */
+
+#include <linux/workqueue.h>
+#include <net/xfrm.h>
+#include <linux/pfkeyv2.h>
+#include <linux/ipsec.h>
+#include <linux/module.h>
+#include <asm/uaccess.h>
+
+/* Each xfrm_state may be linked to two tables:
+
+   1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
+   2. Hash table by daddr to find what SAs exist for given
+      destination/tunnel endpoint. (output)
+ */
+
+static DEFINE_SPINLOCK(xfrm_state_lock);
+
+/* Hash table to find appropriate SA towards given target (endpoint
+ * of tunnel or destination of transport mode) allowed by selector.
+ *
+ * Main use is finding SA after policy selected tunnel or transport mode.
+ * Also, it can be used by ah/esp icmp error handler to find offending SA.
+ */
+static struct list_head xfrm_state_bydst[XFRM_DST_HSIZE];
+static struct list_head xfrm_state_byspi[XFRM_DST_HSIZE];
+
+DECLARE_WAIT_QUEUE_HEAD(km_waitq);
+EXPORT_SYMBOL(km_waitq);
+
+static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
+static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
+
+static struct work_struct xfrm_state_gc_work;
+static struct list_head xfrm_state_gc_list = LIST_HEAD_INIT(xfrm_state_gc_list);
+static DEFINE_SPINLOCK(xfrm_state_gc_lock);
+
+static int xfrm_state_gc_flush_bundles;
+
+static void __xfrm_state_delete(struct xfrm_state *x);
+
+static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
+static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
+
+static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
+static void km_state_expired(struct xfrm_state *x, int hard);
+
+static void xfrm_state_gc_destroy(struct xfrm_state *x)
+{
+	if (del_timer(&x->timer))
+		BUG();
+	if (x->aalg)
+		kfree(x->aalg);
+	if (x->ealg)
+		kfree(x->ealg);
+	if (x->calg)
+		kfree(x->calg);
+	if (x->encap)
+		kfree(x->encap);
+	if (x->type) {
+		x->type->destructor(x);
+		xfrm_put_type(x->type);
+	}
+	kfree(x);
+}
+
+static void xfrm_state_gc_task(void *data)
+{
+	struct xfrm_state *x;
+	struct list_head *entry, *tmp;
+	struct list_head gc_list = LIST_HEAD_INIT(gc_list);
+
+	if (xfrm_state_gc_flush_bundles) {
+		xfrm_state_gc_flush_bundles = 0;
+		xfrm_flush_bundles();
+	}
+
+	spin_lock_bh(&xfrm_state_gc_lock);
+	list_splice_init(&xfrm_state_gc_list, &gc_list);
+	spin_unlock_bh(&xfrm_state_gc_lock);
+
+	list_for_each_safe(entry, tmp, &gc_list) {
+		x = list_entry(entry, struct xfrm_state, bydst);
+		xfrm_state_gc_destroy(x);
+	}
+	wake_up(&km_waitq);
+}
+
+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_timer_handler(unsigned long data)
+{
+	struct xfrm_state *x = (struct xfrm_state*)data;
+	unsigned long now = (unsigned long)xtime.tv_sec;
+	long next = LONG_MAX;
+	int warn = 0;
+
+	spin_lock(&x->lock);
+	if (x->km.state == XFRM_STATE_DEAD)
+		goto out;
+	if (x->km.state == XFRM_STATE_EXPIRED)
+		goto expired;
+	if (x->lft.hard_add_expires_seconds) {
+		long tmo = x->lft.hard_add_expires_seconds +
+			x->curlft.add_time - now;
+		if (tmo <= 0)
+			goto expired;
+		if (tmo < next)
+			next = tmo;
+	}
+	if (x->lft.hard_use_expires_seconds) {
+		long tmo = x->lft.hard_use_expires_seconds +
+			(x->curlft.use_time ? : now) - now;
+		if (tmo <= 0)
+			goto expired;
+		if (tmo < next)
+			next = tmo;
+	}
+	if (x->km.dying)
+		goto resched;
+	if (x->lft.soft_add_expires_seconds) {
+		long tmo = x->lft.soft_add_expires_seconds +
+			x->curlft.add_time - now;
+		if (tmo <= 0)
+			warn = 1;
+		else if (tmo < next)
+			next = tmo;
+	}
+	if (x->lft.soft_use_expires_seconds) {
+		long tmo = x->lft.soft_use_expires_seconds +
+			(x->curlft.use_time ? : now) - now;
+		if (tmo <= 0)
+			warn = 1;
+		else if (tmo < next)
+			next = tmo;
+	}
+
+	if (warn)
+		km_state_expired(x, 0);
+resched:
+	if (next != LONG_MAX &&
+	    !mod_timer(&x->timer, jiffies + make_jiffies(next)))
+		xfrm_state_hold(x);
+	goto out;
+
+expired:
+	if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
+		x->km.state = XFRM_STATE_EXPIRED;
+		wake_up(&km_waitq);
+		next = 2;
+		goto resched;
+	}
+	if (x->id.spi != 0)
+		km_state_expired(x, 1);
+	__xfrm_state_delete(x);
+
+out:
+	spin_unlock(&x->lock);
+	xfrm_state_put(x);
+}
+
+struct xfrm_state *xfrm_state_alloc(void)
+{
+	struct xfrm_state *x;
+
+	x = kmalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
+
+	if (x) {
+		memset(x, 0, sizeof(struct xfrm_state));
+		atomic_set(&x->refcnt, 1);
+		atomic_set(&x->tunnel_users, 0);
+		INIT_LIST_HEAD(&x->bydst);
+		INIT_LIST_HEAD(&x->byspi);
+		init_timer(&x->timer);
+		x->timer.function = xfrm_timer_handler;
+		x->timer.data	  = (unsigned long)x;
+		x->curlft.add_time = (unsigned long)xtime.tv_sec;
+		x->lft.soft_byte_limit = XFRM_INF;
+		x->lft.soft_packet_limit = XFRM_INF;
+		x->lft.hard_byte_limit = XFRM_INF;
+		x->lft.hard_packet_limit = XFRM_INF;
+		spin_lock_init(&x->lock);
+	}
+	return x;
+}
+EXPORT_SYMBOL(xfrm_state_alloc);
+
+void __xfrm_state_destroy(struct xfrm_state *x)
+{
+	BUG_TRAP(x->km.state == XFRM_STATE_DEAD);
+
+	spin_lock_bh(&xfrm_state_gc_lock);
+	list_add(&x->bydst, &xfrm_state_gc_list);
+	spin_unlock_bh(&xfrm_state_gc_lock);
+	schedule_work(&xfrm_state_gc_work);
+}
+EXPORT_SYMBOL(__xfrm_state_destroy);
+
+static void __xfrm_state_delete(struct xfrm_state *x)
+{
+	if (x->km.state != XFRM_STATE_DEAD) {
+		x->km.state = XFRM_STATE_DEAD;
+		spin_lock(&xfrm_state_lock);
+		list_del(&x->bydst);
+		atomic_dec(&x->refcnt);
+		if (x->id.spi) {
+			list_del(&x->byspi);
+			atomic_dec(&x->refcnt);
+		}
+		spin_unlock(&xfrm_state_lock);
+		if (del_timer(&x->timer))
+			atomic_dec(&x->refcnt);
+
+		/* The number two in this test is the reference
+		 * mentioned in the comment below plus the reference
+		 * our caller holds.  A larger value means that
+		 * there are DSTs attached to this xfrm_state.
+		 */
+		if (atomic_read(&x->refcnt) > 2) {
+			xfrm_state_gc_flush_bundles = 1;
+			schedule_work(&xfrm_state_gc_work);
+		}
+
+		/* All xfrm_state objects are created by xfrm_state_alloc.
+		 * The xfrm_state_alloc call gives a reference, and that
+		 * is what we are dropping here.
+		 */
+		atomic_dec(&x->refcnt);
+	}
+}
+
+void xfrm_state_delete(struct xfrm_state *x)
+{
+	spin_lock_bh(&x->lock);
+	__xfrm_state_delete(x);
+	spin_unlock_bh(&x->lock);
+}
+EXPORT_SYMBOL(xfrm_state_delete);
+
+void xfrm_state_flush(u8 proto)
+{
+	int i;
+	struct xfrm_state *x;
+
+	spin_lock_bh(&xfrm_state_lock);
+	for (i = 0; i < XFRM_DST_HSIZE; i++) {
+restart:
+		list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
+			if (!xfrm_state_kern(x) &&
+			    (proto == IPSEC_PROTO_ANY || x->id.proto == proto)) {
+				xfrm_state_hold(x);
+				spin_unlock_bh(&xfrm_state_lock);
+
+				xfrm_state_delete(x);
+				xfrm_state_put(x);
+
+				spin_lock_bh(&xfrm_state_lock);
+				goto restart;
+			}
+		}
+	}
+	spin_unlock_bh(&xfrm_state_lock);
+	wake_up(&km_waitq);
+}
+EXPORT_SYMBOL(xfrm_state_flush);
+
+static int
+xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
+		  struct xfrm_tmpl *tmpl,
+		  xfrm_address_t *daddr, xfrm_address_t *saddr,
+		  unsigned short family)
+{
+	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
+	if (!afinfo)
+		return -1;
+	afinfo->init_tempsel(x, fl, tmpl, daddr, saddr);
+	xfrm_state_put_afinfo(afinfo);
+	return 0;
+}
+
+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)
+{
+	unsigned h = xfrm_dst_hash(daddr, family);
+	struct xfrm_state *x, *x0;
+	int acquire_in_progress = 0;
+	int error = 0;
+	struct xfrm_state *best = NULL;
+	struct xfrm_state_afinfo *afinfo;
+	
+	afinfo = xfrm_state_get_afinfo(family);
+	if (afinfo == NULL) {
+		*err = -EAFNOSUPPORT;
+		return NULL;
+	}
+
+	spin_lock_bh(&xfrm_state_lock);
+	list_for_each_entry(x, xfrm_state_bydst+h, bydst) {
+		if (x->props.family == family &&
+		    x->props.reqid == tmpl->reqid &&
+		    xfrm_state_addr_check(x, daddr, saddr, family) &&
+		    tmpl->mode == x->props.mode &&
+		    tmpl->id.proto == x->id.proto &&
+		    (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) {
+			/* Resolution logic:
+			   1. There is a valid state with matching selector.
+			      Done.
+			   2. Valid state with inappropriate selector. Skip.
+
+			   Entering area of "sysdeps".
+
+			   3. If state is not valid, selector is temporary,
+			      it selects only session which triggered
+			      previous resolution. Key manager will do
+			      something to install a state with proper
+			      selector.
+			 */
+			if (x->km.state == XFRM_STATE_VALID) {
+				if (!xfrm_selector_match(&x->sel, fl, family))
+					continue;
+				if (!best ||
+				    best->km.dying > x->km.dying ||
+				    (best->km.dying == x->km.dying &&
+				     best->curlft.add_time < x->curlft.add_time))
+					best = x;
+			} else if (x->km.state == XFRM_STATE_ACQ) {
+				acquire_in_progress = 1;
+			} else if (x->km.state == XFRM_STATE_ERROR ||
+				   x->km.state == XFRM_STATE_EXPIRED) {
+				if (xfrm_selector_match(&x->sel, fl, family))
+					error = -ESRCH;
+			}
+		}
+	}
+
+	x = best;
+	if (!x && !error && !acquire_in_progress) {
+		x0 = afinfo->state_lookup(&tmpl->id.daddr, tmpl->id.spi, tmpl->id.proto);
+		if (x0 != NULL) {
+			xfrm_state_put(x0);
+			error = -EEXIST;
+			goto out;
+		}
+		x = xfrm_state_alloc();
+		if (x == NULL) {
+			error = -ENOMEM;
+			goto out;
+		}
+		/* Initialize temporary selector matching only
+		 * to current session. */
+		xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
+
+		if (km_query(x, tmpl, pol) == 0) {
+			x->km.state = XFRM_STATE_ACQ;
+			list_add_tail(&x->bydst, xfrm_state_bydst+h);
+			xfrm_state_hold(x);
+			if (x->id.spi) {
+				h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family);
+				list_add(&x->byspi, xfrm_state_byspi+h);
+				xfrm_state_hold(x);
+			}
+			x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
+			xfrm_state_hold(x);
+			x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
+			add_timer(&x->timer);
+		} else {
+			x->km.state = XFRM_STATE_DEAD;
+			xfrm_state_put(x);
+			x = NULL;
+			error = -ESRCH;
+		}
+	}
+out:
+	if (x)
+		xfrm_state_hold(x);
+	else
+		*err = acquire_in_progress ? -EAGAIN : error;
+	spin_unlock_bh(&xfrm_state_lock);
+	xfrm_state_put_afinfo(afinfo);
+	return x;
+}
+
+static void __xfrm_state_insert(struct xfrm_state *x)
+{
+	unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family);
+
+	list_add(&x->bydst, xfrm_state_bydst+h);
+	xfrm_state_hold(x);
+
+	h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family);
+
+	list_add(&x->byspi, xfrm_state_byspi+h);
+	xfrm_state_hold(x);
+
+	if (!mod_timer(&x->timer, jiffies + HZ))
+		xfrm_state_hold(x);
+
+	wake_up(&km_waitq);
+}
+
+void xfrm_state_insert(struct xfrm_state *x)
+{
+	spin_lock_bh(&xfrm_state_lock);
+	__xfrm_state_insert(x);
+	spin_unlock_bh(&xfrm_state_lock);
+}
+EXPORT_SYMBOL(xfrm_state_insert);
+
+static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
+
+int xfrm_state_add(struct xfrm_state *x)
+{
+	struct xfrm_state_afinfo *afinfo;
+	struct xfrm_state *x1;
+	int family;
+	int err;
+
+	family = x->props.family;
+	afinfo = xfrm_state_get_afinfo(family);
+	if (unlikely(afinfo == NULL))
+		return -EAFNOSUPPORT;
+
+	spin_lock_bh(&xfrm_state_lock);
+
+	x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+	if (x1) {
+		xfrm_state_put(x1);
+		x1 = NULL;
+		err = -EEXIST;
+		goto out;
+	}
+
+	if (x->km.seq) {
+		x1 = __xfrm_find_acq_byseq(x->km.seq);
+		if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) {
+			xfrm_state_put(x1);
+			x1 = NULL;
+		}
+	}
+
+	if (!x1)
+		x1 = afinfo->find_acq(
+			x->props.mode, x->props.reqid, x->id.proto,
+			&x->id.daddr, &x->props.saddr, 0);
+
+	__xfrm_state_insert(x);
+	err = 0;
+
+out:
+	spin_unlock_bh(&xfrm_state_lock);
+	xfrm_state_put_afinfo(afinfo);
+
+	if (x1) {
+		xfrm_state_delete(x1);
+		xfrm_state_put(x1);
+	}
+
+	return err;
+}
+EXPORT_SYMBOL(xfrm_state_add);
+
+int xfrm_state_update(struct xfrm_state *x)
+{
+	struct xfrm_state_afinfo *afinfo;
+	struct xfrm_state *x1;
+	int err;
+
+	afinfo = xfrm_state_get_afinfo(x->props.family);
+	if (unlikely(afinfo == NULL))
+		return -EAFNOSUPPORT;
+
+	spin_lock_bh(&xfrm_state_lock);
+	x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+
+	err = -ESRCH;
+	if (!x1)
+		goto out;
+
+	if (xfrm_state_kern(x1)) {
+		xfrm_state_put(x1);
+		err = -EEXIST;
+		goto out;
+	}
+
+	if (x1->km.state == XFRM_STATE_ACQ) {
+		__xfrm_state_insert(x);
+		x = NULL;
+	}
+	err = 0;
+
+out:
+	spin_unlock_bh(&xfrm_state_lock);
+	xfrm_state_put_afinfo(afinfo);
+
+	if (err)
+		return err;
+
+	if (!x) {
+		xfrm_state_delete(x1);
+		xfrm_state_put(x1);
+		return 0;
+	}
+
+	err = -EINVAL;
+	spin_lock_bh(&x1->lock);
+	if (likely(x1->km.state == XFRM_STATE_VALID)) {
+		if (x->encap && x1->encap)
+			memcpy(x1->encap, x->encap, sizeof(*x1->encap));
+		memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
+		x1->km.dying = 0;
+
+		if (!mod_timer(&x1->timer, jiffies + HZ))
+			xfrm_state_hold(x1);
+		if (x1->curlft.use_time)
+			xfrm_state_check_expire(x1);
+
+		err = 0;
+	}
+	spin_unlock_bh(&x1->lock);
+
+	xfrm_state_put(x1);
+
+	return err;
+}
+EXPORT_SYMBOL(xfrm_state_update);
+
+int xfrm_state_check_expire(struct xfrm_state *x)
+{
+	if (!x->curlft.use_time)
+		x->curlft.use_time = (unsigned long)xtime.tv_sec;
+
+	if (x->km.state != XFRM_STATE_VALID)
+		return -EINVAL;
+
+	if (x->curlft.bytes >= x->lft.hard_byte_limit ||
+	    x->curlft.packets >= x->lft.hard_packet_limit) {
+		km_state_expired(x, 1);
+		if (!mod_timer(&x->timer, jiffies + XFRM_ACQ_EXPIRES*HZ))
+			xfrm_state_hold(x);
+		return -EINVAL;
+	}
+
+	if (!x->km.dying &&
+	    (x->curlft.bytes >= x->lft.soft_byte_limit ||
+	     x->curlft.packets >= x->lft.soft_packet_limit))
+		km_state_expired(x, 0);
+	return 0;
+}
+EXPORT_SYMBOL(xfrm_state_check_expire);
+
+static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
+{
+	int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev)
+		- skb_headroom(skb);
+
+	if (nhead > 0)
+		return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
+
+	/* Check tail too... */
+	return 0;
+}
+
+int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
+{
+	int err = xfrm_state_check_expire(x);
+	if (err < 0)
+		goto err;
+	err = xfrm_state_check_space(x, skb);
+err:
+	return err;
+}
+EXPORT_SYMBOL(xfrm_state_check);
+
+struct xfrm_state *
+xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto,
+		  unsigned short family)
+{
+	struct xfrm_state *x;
+	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
+	if (!afinfo)
+		return NULL;
+
+	spin_lock_bh(&xfrm_state_lock);
+	x = afinfo->state_lookup(daddr, spi, proto);
+	spin_unlock_bh(&xfrm_state_lock);
+	xfrm_state_put_afinfo(afinfo);
+	return x;
+}
+EXPORT_SYMBOL(xfrm_state_lookup);
+
+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)
+{
+	struct xfrm_state *x;
+	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
+	if (!afinfo)
+		return NULL;
+
+	spin_lock_bh(&xfrm_state_lock);
+	x = afinfo->find_acq(mode, reqid, proto, daddr, saddr, create);
+	spin_unlock_bh(&xfrm_state_lock);
+	xfrm_state_put_afinfo(afinfo);
+	return x;
+}
+EXPORT_SYMBOL(xfrm_find_acq);
+
+/* Silly enough, but I'm lazy to build resolution list */
+
+static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)
+{
+	int i;
+	struct xfrm_state *x;
+
+	for (i = 0; i < XFRM_DST_HSIZE; i++) {
+		list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
+			if (x->km.seq == seq && x->km.state == XFRM_STATE_ACQ) {
+				xfrm_state_hold(x);
+				return x;
+			}
+		}
+	}
+	return NULL;
+}
+
+struct xfrm_state *xfrm_find_acq_byseq(u32 seq)
+{
+	struct xfrm_state *x;
+
+	spin_lock_bh(&xfrm_state_lock);
+	x = __xfrm_find_acq_byseq(seq);
+	spin_unlock_bh(&xfrm_state_lock);
+	return x;
+}
+EXPORT_SYMBOL(xfrm_find_acq_byseq);
+
+u32 xfrm_get_acqseq(void)
+{
+	u32 res;
+	static u32 acqseq;
+	static DEFINE_SPINLOCK(acqseq_lock);
+
+	spin_lock_bh(&acqseq_lock);
+	res = (++acqseq ? : ++acqseq);
+	spin_unlock_bh(&acqseq_lock);
+	return res;
+}
+EXPORT_SYMBOL(xfrm_get_acqseq);
+
+void
+xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi)
+{
+	u32 h;
+	struct xfrm_state *x0;
+
+	if (x->id.spi)
+		return;
+
+	if (minspi == maxspi) {
+		x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family);
+		if (x0) {
+			xfrm_state_put(x0);
+			return;
+		}
+		x->id.spi = minspi;
+	} else {
+		u32 spi = 0;
+		minspi = ntohl(minspi);
+		maxspi = ntohl(maxspi);
+		for (h=0; h<maxspi-minspi+1; h++) {
+			spi = minspi + net_random()%(maxspi-minspi+1);
+			x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family);
+			if (x0 == NULL) {
+				x->id.spi = htonl(spi);
+				break;
+			}
+			xfrm_state_put(x0);
+		}
+	}
+	if (x->id.spi) {
+		spin_lock_bh(&xfrm_state_lock);
+		h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family);
+		list_add(&x->byspi, xfrm_state_byspi+h);
+		xfrm_state_hold(x);
+		spin_unlock_bh(&xfrm_state_lock);
+		wake_up(&km_waitq);
+	}
+}
+EXPORT_SYMBOL(xfrm_alloc_spi);
+
+int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
+		    void *data)
+{
+	int i;
+	struct xfrm_state *x;
+	int count = 0;
+	int err = 0;
+
+	spin_lock_bh(&xfrm_state_lock);
+	for (i = 0; i < XFRM_DST_HSIZE; i++) {
+		list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
+			if (proto == IPSEC_PROTO_ANY || x->id.proto == proto)
+				count++;
+		}
+	}
+	if (count == 0) {
+		err = -ENOENT;
+		goto out;
+	}
+
+	for (i = 0; i < XFRM_DST_HSIZE; i++) {
+		list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
+			if (proto != IPSEC_PROTO_ANY && x->id.proto != proto)
+				continue;
+			err = func(x, --count, data);
+			if (err)
+				goto out;
+		}
+	}
+out:
+	spin_unlock_bh(&xfrm_state_lock);
+	return err;
+}
+EXPORT_SYMBOL(xfrm_state_walk);
+
+int xfrm_replay_check(struct xfrm_state *x, u32 seq)
+{
+	u32 diff;
+
+	seq = ntohl(seq);
+
+	if (unlikely(seq == 0))
+		return -EINVAL;
+
+	if (likely(seq > x->replay.seq))
+		return 0;
+
+	diff = x->replay.seq - seq;
+	if (diff >= x->props.replay_window) {
+		x->stats.replay_window++;
+		return -EINVAL;
+	}
+
+	if (x->replay.bitmap & (1U << diff)) {
+		x->stats.replay++;
+		return -EINVAL;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(xfrm_replay_check);
+
+void xfrm_replay_advance(struct xfrm_state *x, u32 seq)
+{
+	u32 diff;
+
+	seq = ntohl(seq);
+
+	if (seq > x->replay.seq) {
+		diff = seq - x->replay.seq;
+		if (diff < x->props.replay_window)
+			x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
+		else
+			x->replay.bitmap = 1;
+		x->replay.seq = seq;
+	} else {
+		diff = x->replay.seq - seq;
+		x->replay.bitmap |= (1U << diff);
+	}
+}
+EXPORT_SYMBOL(xfrm_replay_advance);
+
+static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list);
+static DEFINE_RWLOCK(xfrm_km_lock);
+
+static void km_state_expired(struct xfrm_state *x, int hard)
+{
+	struct xfrm_mgr *km;
+
+	if (hard)
+		x->km.state = XFRM_STATE_EXPIRED;
+	else
+		x->km.dying = 1;
+
+	read_lock(&xfrm_km_lock);
+	list_for_each_entry(km, &xfrm_km_list, list)
+		km->notify(x, hard);
+	read_unlock(&xfrm_km_lock);
+
+	if (hard)
+		wake_up(&km_waitq);
+}
+
+static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
+{
+	int err = -EINVAL;
+	struct xfrm_mgr *km;
+
+	read_lock(&xfrm_km_lock);
+	list_for_each_entry(km, &xfrm_km_list, list) {
+		err = km->acquire(x, t, pol, XFRM_POLICY_OUT);
+		if (!err)
+			break;
+	}
+	read_unlock(&xfrm_km_lock);
+	return err;
+}
+
+int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
+{
+	int err = -EINVAL;
+	struct xfrm_mgr *km;
+
+	read_lock(&xfrm_km_lock);
+	list_for_each_entry(km, &xfrm_km_list, list) {
+		if (km->new_mapping)
+			err = km->new_mapping(x, ipaddr, sport);
+		if (!err)
+			break;
+	}
+	read_unlock(&xfrm_km_lock);
+	return err;
+}
+EXPORT_SYMBOL(km_new_mapping);
+
+void km_policy_expired(struct xfrm_policy *pol, int dir, int hard)
+{
+	struct xfrm_mgr *km;
+
+	read_lock(&xfrm_km_lock);
+	list_for_each_entry(km, &xfrm_km_list, list)
+		if (km->notify_policy)
+			km->notify_policy(pol, dir, hard);
+	read_unlock(&xfrm_km_lock);
+
+	if (hard)
+		wake_up(&km_waitq);
+}
+
+int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
+{
+	int err;
+	u8 *data;
+	struct xfrm_mgr *km;
+	struct xfrm_policy *pol = NULL;
+
+	if (optlen <= 0 || optlen > PAGE_SIZE)
+		return -EMSGSIZE;
+
+	data = kmalloc(optlen, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	err = -EFAULT;
+	if (copy_from_user(data, optval, optlen))
+		goto out;
+
+	err = -EINVAL;
+	read_lock(&xfrm_km_lock);
+	list_for_each_entry(km, &xfrm_km_list, list) {
+		pol = km->compile_policy(sk->sk_family, optname, data,
+					 optlen, &err);
+		if (err >= 0)
+			break;
+	}
+	read_unlock(&xfrm_km_lock);
+
+	if (err >= 0) {
+		xfrm_sk_policy_insert(sk, err, pol);
+		xfrm_pol_put(pol);
+		err = 0;
+	}
+
+out:
+	kfree(data);
+	return err;
+}
+EXPORT_SYMBOL(xfrm_user_policy);
+
+int xfrm_register_km(struct xfrm_mgr *km)
+{
+	write_lock_bh(&xfrm_km_lock);
+	list_add_tail(&km->list, &xfrm_km_list);
+	write_unlock_bh(&xfrm_km_lock);
+	return 0;
+}
+EXPORT_SYMBOL(xfrm_register_km);
+
+int xfrm_unregister_km(struct xfrm_mgr *km)
+{
+	write_lock_bh(&xfrm_km_lock);
+	list_del(&km->list);
+	write_unlock_bh(&xfrm_km_lock);
+	return 0;
+}
+EXPORT_SYMBOL(xfrm_unregister_km);
+
+int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
+{
+	int err = 0;
+	if (unlikely(afinfo == NULL))
+		return -EINVAL;
+	if (unlikely(afinfo->family >= NPROTO))
+		return -EAFNOSUPPORT;
+	write_lock(&xfrm_state_afinfo_lock);
+	if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
+		err = -ENOBUFS;
+	else {
+		afinfo->state_bydst = xfrm_state_bydst;
+		afinfo->state_byspi = xfrm_state_byspi;
+		xfrm_state_afinfo[afinfo->family] = afinfo;
+	}
+	write_unlock(&xfrm_state_afinfo_lock);
+	return err;
+}
+EXPORT_SYMBOL(xfrm_state_register_afinfo);
+
+int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
+{
+	int err = 0;
+	if (unlikely(afinfo == NULL))
+		return -EINVAL;
+	if (unlikely(afinfo->family >= NPROTO))
+		return -EAFNOSUPPORT;
+	write_lock(&xfrm_state_afinfo_lock);
+	if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
+		if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
+			err = -EINVAL;
+		else {
+			xfrm_state_afinfo[afinfo->family] = NULL;
+			afinfo->state_byspi = NULL;
+			afinfo->state_bydst = NULL;
+		}
+	}
+	write_unlock(&xfrm_state_afinfo_lock);
+	return err;
+}
+EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
+
+static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
+{
+	struct xfrm_state_afinfo *afinfo;
+	if (unlikely(family >= NPROTO))
+		return NULL;
+	read_lock(&xfrm_state_afinfo_lock);
+	afinfo = xfrm_state_afinfo[family];
+	if (likely(afinfo != NULL))
+		read_lock(&afinfo->lock);
+	read_unlock(&xfrm_state_afinfo_lock);
+	return afinfo;
+}
+
+static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
+{
+	if (unlikely(afinfo == NULL))
+		return;
+	read_unlock(&afinfo->lock);
+}
+
+/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
+void xfrm_state_delete_tunnel(struct xfrm_state *x)
+{
+	if (x->tunnel) {
+		struct xfrm_state *t = x->tunnel;
+
+		if (atomic_read(&t->tunnel_users) == 2)
+			xfrm_state_delete(t);
+		atomic_dec(&t->tunnel_users);
+		xfrm_state_put(t);
+		x->tunnel = NULL;
+	}
+}
+EXPORT_SYMBOL(xfrm_state_delete_tunnel);
+
+int xfrm_state_mtu(struct xfrm_state *x, int mtu)
+{
+	int res = mtu;
+
+	res -= x->props.header_len;
+
+	for (;;) {
+		int m = res;
+
+		if (m < 68)
+			return 68;
+
+		spin_lock_bh(&x->lock);
+		if (x->km.state == XFRM_STATE_VALID &&
+		    x->type && x->type->get_max_size)
+			m = x->type->get_max_size(x, m);
+		else
+			m += x->props.header_len;
+		spin_unlock_bh(&x->lock);
+
+		if (m <= mtu)
+			break;
+		res -= (m - mtu);
+	}
+
+	return res;
+}
+
+EXPORT_SYMBOL(xfrm_state_mtu);
+ 
+void __init xfrm_state_init(void)
+{
+	int i;
+
+	for (i=0; i<XFRM_DST_HSIZE; i++) {
+		INIT_LIST_HEAD(&xfrm_state_bydst[i]);
+		INIT_LIST_HEAD(&xfrm_state_byspi[i]);
+	}
+	INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL);
+}
+