Merge branch 'testing' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next

Steffen Klassert says:

====================
1) Add a statistic counter for invalid output states and
   remove a superfluous state valid check, from Li RongQing.

2) Probe for asynchronous block ciphers instead of synchronous block
   ciphers to make the asynchronous variants available even if no
   synchronous block ciphers are found, from Jussi Kivilinna.

3) Make rfc3686 asynchronous block cipher and make use of
   the new asynchronous variant, from Jussi Kivilinna.

4) Replace some rwlocks by rcu, from Cong Wang.

5) Remove some unused defines.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 69 insertions, 72 deletions

diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index 4ce2d93162c..f9a54955474 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -700,8 +700,7 @@ void xfrm_probe_algs(void)
 	}
 
 	for (i = 0; i < ealg_entries(); i++) {
-		status = crypto_has_blkcipher(ealg_list[i].name, 0,
-					      CRYPTO_ALG_ASYNC);
+		status = crypto_has_ablkcipher(ealg_list[i].name, 0, 0);
 		if (ealg_list[i].available != status)
 			ealg_list[i].available = status;
 	}
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 95a338c89f9..3670526e70b 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -61,6 +61,12 @@ static int xfrm_output_one(struct sk_buff *skb, int err)
 		}
 
 		spin_lock_bh(&x->lock);
+
+		if (unlikely(x->km.state != XFRM_STATE_VALID)) {
+			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID);
+			goto error_nolock;
+		}
+
 		err = xfrm_state_check_expire(x);
 		if (err) {
 			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED);
diff --git a/net/xfrm/xfrm_proc.c b/net/xfrm/xfrm_proc.c
index d0a1af8ed58..603903853e8 100644
--- a/net/xfrm/xfrm_proc.c
+++ b/net/xfrm/xfrm_proc.c
@@ -43,6 +43,7 @@ static const struct snmp_mib xfrm_mib_list[] = {
 	SNMP_MIB_ITEM("XfrmOutPolDead", LINUX_MIB_XFRMOUTPOLDEAD),
 	SNMP_MIB_ITEM("XfrmOutPolError", LINUX_MIB_XFRMOUTPOLERROR),
 	SNMP_MIB_ITEM("XfrmFwdHdrError", LINUX_MIB_XFRMFWDHDRERROR),
+	SNMP_MIB_ITEM("XfrmOutStateInvalid", LINUX_MIB_XFRMOUTSTATEINVALID),
 	SNMP_MIB_SENTINEL
 };
 
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 3459692092e..0adae918a7a 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -158,8 +158,8 @@ out_unlock:
 	mutex_unlock(&hash_resize_mutex);
 }
 
-static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
-static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
+static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
+static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
 
 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 
@@ -168,58 +168,45 @@ int __xfrm_state_delete(struct xfrm_state *x);
 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
 
-static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
-{
-	struct xfrm_state_afinfo *afinfo;
-	if (unlikely(family >= NPROTO))
-		return NULL;
-	write_lock_bh(&xfrm_state_afinfo_lock);
-	afinfo = xfrm_state_afinfo[family];
-	if (unlikely(!afinfo))
-		write_unlock_bh(&xfrm_state_afinfo_lock);
-	return afinfo;
-}
-
-static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
-	__releases(xfrm_state_afinfo_lock)
-{
-	write_unlock_bh(&xfrm_state_afinfo_lock);
-}
-
+static DEFINE_SPINLOCK(xfrm_type_lock);
 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
 {
-	struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
+	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 	const struct xfrm_type **typemap;
 	int err = 0;
 
 	if (unlikely(afinfo == NULL))
 		return -EAFNOSUPPORT;
 	typemap = afinfo->type_map;
+	spin_lock_bh(&xfrm_type_lock);
 
 	if (likely(typemap[type->proto] == NULL))
 		typemap[type->proto] = type;
 	else
 		err = -EEXIST;
-	xfrm_state_unlock_afinfo(afinfo);
+	spin_unlock_bh(&xfrm_type_lock);
+	xfrm_state_put_afinfo(afinfo);
 	return err;
 }
 EXPORT_SYMBOL(xfrm_register_type);
 
 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
 {
-	struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
+	struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
 	const struct xfrm_type **typemap;
 	int err = 0;
 
 	if (unlikely(afinfo == NULL))
 		return -EAFNOSUPPORT;
 	typemap = afinfo->type_map;
+	spin_lock_bh(&xfrm_type_lock);
 
 	if (unlikely(typemap[type->proto] != type))
 		err = -ENOENT;
 	else
 		typemap[type->proto] = NULL;
-	xfrm_state_unlock_afinfo(afinfo);
+	spin_unlock_bh(&xfrm_type_lock);
+	xfrm_state_put_afinfo(afinfo);
 	return err;
 }
 EXPORT_SYMBOL(xfrm_unregister_type);
@@ -256,6 +243,7 @@ static void xfrm_put_type(const struct xfrm_type *type)
 	module_put(type->owner);
 }
 
+static DEFINE_SPINLOCK(xfrm_mode_lock);
 int xfrm_register_mode(struct xfrm_mode *mode, int family)
 {
 	struct xfrm_state_afinfo *afinfo;
@@ -265,12 +253,13 @@ int xfrm_register_mode(struct xfrm_mode *mode, int family)
 	if (unlikely(mode->encap >= XFRM_MODE_MAX))
 		return -EINVAL;
 
-	afinfo = xfrm_state_lock_afinfo(family);
+	afinfo = xfrm_state_get_afinfo(family);
 	if (unlikely(afinfo == NULL))
 		return -EAFNOSUPPORT;
 
 	err = -EEXIST;
 	modemap = afinfo->mode_map;
+	spin_lock_bh(&xfrm_mode_lock);
 	if (modemap[mode->encap])
 		goto out;
 
@@ -283,7 +272,8 @@ int xfrm_register_mode(struct xfrm_mode *mode, int family)
 	err = 0;
 
 out:
-	xfrm_state_unlock_afinfo(afinfo);
+	spin_unlock_bh(&xfrm_mode_lock);
+	xfrm_state_put_afinfo(afinfo);
 	return err;
 }
 EXPORT_SYMBOL(xfrm_register_mode);
@@ -297,19 +287,21 @@ int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
 	if (unlikely(mode->encap >= XFRM_MODE_MAX))
 		return -EINVAL;
 
-	afinfo = xfrm_state_lock_afinfo(family);
+	afinfo = xfrm_state_get_afinfo(family);
 	if (unlikely(afinfo == NULL))
 		return -EAFNOSUPPORT;
 
 	err = -ENOENT;
 	modemap = afinfo->mode_map;
+	spin_lock_bh(&xfrm_mode_lock);
 	if (likely(modemap[mode->encap] == mode)) {
 		modemap[mode->encap] = NULL;
 		module_put(mode->afinfo->owner);
 		err = 0;
 	}
 
-	xfrm_state_unlock_afinfo(afinfo);
+	spin_unlock_bh(&xfrm_mode_lock);
+	xfrm_state_put_afinfo(afinfo);
 	return err;
 }
 EXPORT_SYMBOL(xfrm_unregister_mode);
@@ -1370,9 +1362,6 @@ int xfrm_state_check_expire(struct xfrm_state *x)
 	if (!x->curlft.use_time)
 		x->curlft.use_time = get_seconds();
 
-	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) {
 		x->km.state = XFRM_STATE_EXPIRED;
@@ -1648,27 +1637,26 @@ static void xfrm_replay_timer_handler(unsigned long data)
 }
 
 static LIST_HEAD(xfrm_km_list);
-static DEFINE_RWLOCK(xfrm_km_lock);
 
 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
 {
 	struct xfrm_mgr *km;
 
-	read_lock(&xfrm_km_lock);
-	list_for_each_entry(km, &xfrm_km_list, list)
+	rcu_read_lock();
+	list_for_each_entry_rcu(km, &xfrm_km_list, list)
 		if (km->notify_policy)
 			km->notify_policy(xp, dir, c);
-	read_unlock(&xfrm_km_lock);
+	rcu_read_unlock();
 }
 
 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
 {
 	struct xfrm_mgr *km;
-	read_lock(&xfrm_km_lock);
-	list_for_each_entry(km, &xfrm_km_list, list)
+	rcu_read_lock();
+	list_for_each_entry_rcu(km, &xfrm_km_list, list)
 		if (km->notify)
 			km->notify(x, c);
-	read_unlock(&xfrm_km_lock);
+	rcu_read_unlock();
 }
 
 EXPORT_SYMBOL(km_policy_notify);
@@ -1698,13 +1686,13 @@ int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
 	int err = -EINVAL, acqret;
 	struct xfrm_mgr *km;
 
-	read_lock(&xfrm_km_lock);
-	list_for_each_entry(km, &xfrm_km_list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
 		acqret = km->acquire(x, t, pol);
 		if (!acqret)
 			err = acqret;
 	}
-	read_unlock(&xfrm_km_lock);
+	rcu_read_unlock();
 	return err;
 }
 EXPORT_SYMBOL(km_query);
@@ -1714,14 +1702,14 @@ int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
 	int err = -EINVAL;
 	struct xfrm_mgr *km;
 
-	read_lock(&xfrm_km_lock);
-	list_for_each_entry(km, &xfrm_km_list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
 		if (km->new_mapping)
 			err = km->new_mapping(x, ipaddr, sport);
 		if (!err)
 			break;
 	}
-	read_unlock(&xfrm_km_lock);
+	rcu_read_unlock();
 	return err;
 }
 EXPORT_SYMBOL(km_new_mapping);
@@ -1750,15 +1738,15 @@ int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 	int ret;
 	struct xfrm_mgr *km;
 
-	read_lock(&xfrm_km_lock);
-	list_for_each_entry(km, &xfrm_km_list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
 		if (km->migrate) {
 			ret = km->migrate(sel, dir, type, m, num_migrate, k);
 			if (!ret)
 				err = ret;
 		}
 	}
-	read_unlock(&xfrm_km_lock);
+	rcu_read_unlock();
 	return err;
 }
 EXPORT_SYMBOL(km_migrate);
@@ -1770,15 +1758,15 @@ int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address
 	int ret;
 	struct xfrm_mgr *km;
 
-	read_lock(&xfrm_km_lock);
-	list_for_each_entry(km, &xfrm_km_list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
 		if (km->report) {
 			ret = km->report(net, proto, sel, addr);
 			if (!ret)
 				err = ret;
 		}
 	}
-	read_unlock(&xfrm_km_lock);
+	rcu_read_unlock();
 	return err;
 }
 EXPORT_SYMBOL(km_report);
@@ -1802,14 +1790,14 @@ int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen
 		goto out;
 
 	err = -EINVAL;
-	read_lock(&xfrm_km_lock);
-	list_for_each_entry(km, &xfrm_km_list, list) {
+	rcu_read_lock();
+	list_for_each_entry_rcu(km, &xfrm_km_list, list) {
 		pol = km->compile_policy(sk, optname, data,
 					 optlen, &err);
 		if (err >= 0)
 			break;
 	}
-	read_unlock(&xfrm_km_lock);
+	rcu_read_unlock();
 
 	if (err >= 0) {
 		xfrm_sk_policy_insert(sk, err, pol);
@@ -1823,20 +1811,23 @@ out:
 }
 EXPORT_SYMBOL(xfrm_user_policy);
 
+static DEFINE_SPINLOCK(xfrm_km_lock);
+
 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);
+	spin_lock_bh(&xfrm_km_lock);
+	list_add_tail_rcu(&km->list, &xfrm_km_list);
+	spin_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);
+	spin_lock_bh(&xfrm_km_lock);
+	list_del_rcu(&km->list);
+	spin_unlock_bh(&xfrm_km_lock);
+	synchronize_rcu();
 	return 0;
 }
 EXPORT_SYMBOL(xfrm_unregister_km);
@@ -1848,12 +1839,12 @@ int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
 		return -EINVAL;
 	if (unlikely(afinfo->family >= NPROTO))
 		return -EAFNOSUPPORT;
-	write_lock_bh(&xfrm_state_afinfo_lock);
+	spin_lock_bh(&xfrm_state_afinfo_lock);
 	if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
 		err = -ENOBUFS;
 	else
-		xfrm_state_afinfo[afinfo->family] = afinfo;
-	write_unlock_bh(&xfrm_state_afinfo_lock);
+		rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
+	spin_unlock_bh(&xfrm_state_afinfo_lock);
 	return err;
 }
 EXPORT_SYMBOL(xfrm_state_register_afinfo);
@@ -1865,14 +1856,15 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
 		return -EINVAL;
 	if (unlikely(afinfo->family >= NPROTO))
 		return -EAFNOSUPPORT;
-	write_lock_bh(&xfrm_state_afinfo_lock);
+	spin_lock_bh(&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;
+			RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
 	}
-	write_unlock_bh(&xfrm_state_afinfo_lock);
+	spin_unlock_bh(&xfrm_state_afinfo_lock);
+	synchronize_rcu();
 	return err;
 }
 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
@@ -1882,17 +1874,16 @@ static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
 	struct xfrm_state_afinfo *afinfo;
 	if (unlikely(family >= NPROTO))
 		return NULL;
-	read_lock(&xfrm_state_afinfo_lock);
-	afinfo = xfrm_state_afinfo[family];
+	rcu_read_lock();
+	afinfo = rcu_dereference(xfrm_state_afinfo[family]);
 	if (unlikely(!afinfo))
-		read_unlock(&xfrm_state_afinfo_lock);
+		rcu_read_unlock();
 	return afinfo;
 }
 
 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
-	__releases(xfrm_state_afinfo_lock)
 {
-	read_unlock(&xfrm_state_afinfo_lock);
+	rcu_read_unlock();
 }
 
 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */