1 files changed, 95 insertions, 68 deletions

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index f1683ce6b561..c891b60937a7 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -18,14 +18,13 @@
 #include <net/sock.h>
 #include <net/gro_cells.h>
 #include <net/macsec.h>
+#include <net/dst_metadata.h>
 #include <linux/phy.h>
 #include <linux/byteorder/generic.h>
 #include <linux/if_arp.h>
 
 #include <uapi/linux/if_macsec.h>
 
-#define MACSEC_SCI_LEN 8
-
 /* SecTAG length = macsec_eth_header without the optional SCI */
 #define MACSEC_TAG_LEN 6
 
@@ -46,20 +45,10 @@ struct macsec_eth_header {
 	u8 secure_channel_id[8]; /* optional */
 } __packed;
 
-#define MACSEC_TCI_VERSION 0x80
-#define MACSEC_TCI_ES      0x40 /* end station */
-#define MACSEC_TCI_SC      0x20 /* SCI present */
-#define MACSEC_TCI_SCB     0x10 /* epon */
-#define MACSEC_TCI_E       0x08 /* encryption */
-#define MACSEC_TCI_C       0x04 /* changed text */
-#define MACSEC_AN_MASK     0x03 /* association number */
-#define MACSEC_TCI_CONFID  (MACSEC_TCI_E | MACSEC_TCI_C)
-
 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
 #define MIN_NON_SHORT_LEN 48
 
 #define GCM_AES_IV_LEN 12
-#define DEFAULT_ICV_LEN 16
 
 #define for_each_rxsc(secy, sc)				\
 	for (sc = rcu_dereference_bh(secy->rx_sc);	\
@@ -162,6 +151,19 @@ static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
 	return sa;
 }
 
+static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc)
+{
+	struct macsec_rx_sa *sa = NULL;
+	int an;
+
+	for (an = 0; an < MACSEC_NUM_AN; an++)	{
+		sa = macsec_rxsa_get(rx_sc->sa[an]);
+		if (sa)
+			break;
+	}
+	return sa;
+}
+
 static void free_rx_sc_rcu(struct rcu_head *head)
 {
 	struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
@@ -230,7 +232,6 @@ static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
 	return (struct macsec_cb *)skb->cb;
 }
 
-#define MACSEC_PORT_ES (htons(0x0001))
 #define MACSEC_PORT_SCB (0x0000)
 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
 #define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
@@ -245,14 +246,6 @@ static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
 #define DEFAULT_ENCODING_SA 0
 #define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
 
-static bool send_sci(const struct macsec_secy *secy)
-{
-	const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
-
-	return tx_sc->send_sci ||
-		(secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
-}
-
 static sci_t make_sci(const u8 *addr, __be16 port)
 {
 	sci_t sci;
@@ -317,7 +310,7 @@ static void macsec_fill_sectag(struct macsec_eth_header *h,
 	/* with GCM, C/E clear for !encrypt, both set for encrypt */
 	if (tx_sc->encrypt)
 		h->tci_an |= MACSEC_TCI_CONFID;
-	else if (secy->icv_len != DEFAULT_ICV_LEN)
+	else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
 		h->tci_an |= MACSEC_TCI_C;
 
 	h->tci_an |= tx_sc->encoding_sa;
@@ -449,11 +442,6 @@ static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
 	return (struct macsec_eth_header *)skb_mac_header(skb);
 }
 
-static sci_t dev_to_sci(struct net_device *dev, __be16 port)
-{
-	return make_sci(dev->dev_addr, port);
-}
-
 static void __macsec_pn_wrapped(struct macsec_secy *secy,
 				struct macsec_tx_sa *tx_sa)
 {
@@ -500,18 +488,28 @@ static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
 	skb->protocol = eth_hdr(skb)->h_proto;
 }
 
+static unsigned int macsec_msdu_len(struct sk_buff *skb)
+{
+	struct macsec_dev *macsec = macsec_priv(skb->dev);
+	struct macsec_secy *secy = &macsec->secy;
+	bool sci_present = macsec_skb_cb(skb)->has_sci;
+
+	return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
+}
+
 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
 			    struct macsec_tx_sa *tx_sa)
 {
+	unsigned int msdu_len = macsec_msdu_len(skb);
 	struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
 
 	u64_stats_update_begin(&txsc_stats->syncp);
 	if (tx_sc->encrypt) {
-		txsc_stats->stats.OutOctetsEncrypted += skb->len;
+		txsc_stats->stats.OutOctetsEncrypted += msdu_len;
 		txsc_stats->stats.OutPktsEncrypted++;
 		this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
 	} else {
-		txsc_stats->stats.OutOctetsProtected += skb->len;
+		txsc_stats->stats.OutOctetsProtected += msdu_len;
 		txsc_stats->stats.OutPktsProtected++;
 		this_cpu_inc(tx_sa->stats->OutPktsProtected);
 	}
@@ -541,9 +539,10 @@ static void macsec_encrypt_done(struct crypto_async_request *base, int err)
 	aead_request_free(macsec_skb_cb(skb)->req);
 
 	rcu_read_lock_bh();
-	macsec_encrypt_finish(skb, dev);
 	macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
-	len = skb->len;
+	/* packet is encrypted/protected so tx_bytes must be calculated */
+	len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
+	macsec_encrypt_finish(skb, dev);
 	ret = dev_queue_xmit(skb);
 	count_tx(dev, ret, len);
 	rcu_read_unlock_bh();
@@ -635,7 +634,7 @@ static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
 
 	unprotected_len = skb->len;
 	eth = eth_hdr(skb);
-	sci_present = send_sci(secy);
+	sci_present = macsec_send_sci(secy);
 	hh = skb_push(skb, macsec_extra_len(sci_present));
 	memmove(hh, eth, 2 * ETH_ALEN);
 
@@ -702,6 +701,7 @@ static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
 
 	macsec_skb_cb(skb)->req = req;
 	macsec_skb_cb(skb)->tx_sa = tx_sa;
+	macsec_skb_cb(skb)->has_sci = sci_present;
 	aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
 
 	dev_hold(skb->dev);
@@ -743,15 +743,17 @@ static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u
 		u64_stats_update_begin(&rxsc_stats->syncp);
 		rxsc_stats->stats.InPktsLate++;
 		u64_stats_update_end(&rxsc_stats->syncp);
+		secy->netdev->stats.rx_dropped++;
 		return false;
 	}
 
 	if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
+		unsigned int msdu_len = macsec_msdu_len(skb);
 		u64_stats_update_begin(&rxsc_stats->syncp);
 		if (hdr->tci_an & MACSEC_TCI_E)
-			rxsc_stats->stats.InOctetsDecrypted += skb->len;
+			rxsc_stats->stats.InOctetsDecrypted += msdu_len;
 		else
-			rxsc_stats->stats.InOctetsValidated += skb->len;
+			rxsc_stats->stats.InOctetsValidated += msdu_len;
 		u64_stats_update_end(&rxsc_stats->syncp);
 	}
 
@@ -764,6 +766,8 @@ static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u
 			u64_stats_update_begin(&rxsc_stats->syncp);
 			rxsc_stats->stats.InPktsNotValid++;
 			u64_stats_update_end(&rxsc_stats->syncp);
+			this_cpu_inc(rx_sa->stats->InPktsNotValid);
+			secy->netdev->stats.rx_errors++;
 			return false;
 		}
 
@@ -856,9 +860,9 @@ static void macsec_decrypt_done(struct crypto_async_request *base, int err)
 
 	macsec_finalize_skb(skb, macsec->secy.icv_len,
 			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
+	len = skb->len;
 	macsec_reset_skb(skb, macsec->secy.netdev);
 
-	len = skb->len;
 	if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
 		count_rx(dev, len);
 
@@ -1000,11 +1004,13 @@ static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
 	/* Deliver to the uncontrolled port by default */
 	enum rx_handler_result ret = RX_HANDLER_PASS;
 	struct ethhdr *hdr = eth_hdr(skb);
+	struct metadata_dst *md_dst;
 	struct macsec_rxh_data *rxd;
 	struct macsec_dev *macsec;
 
 	rcu_read_lock();
 	rxd = macsec_data_rcu(skb->dev);
+	md_dst = skb_metadata_dst(skb);
 
 	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
 		struct sk_buff *nskb;
@@ -1015,6 +1021,10 @@ static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
 		 * the SecTAG, so we have to deduce which port to deliver to.
 		 */
 		if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
+			if (md_dst && md_dst->type == METADATA_MACSEC &&
+			    (!find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci)))
+				continue;
+
 			if (ether_addr_equal_64bits(hdr->h_dest,
 						    ndev->dev_addr)) {
 				/* exact match, divert skb to this port */
@@ -1049,6 +1059,7 @@ static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
 			u64_stats_update_begin(&secy_stats->syncp);
 			secy_stats->stats.InPktsNoTag++;
 			u64_stats_update_end(&secy_stats->syncp);
+			macsec->secy.netdev->stats.rx_dropped++;
 			continue;
 		}
 
@@ -1158,6 +1169,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
 		u64_stats_update_begin(&secy_stats->syncp);
 		secy_stats->stats.InPktsBadTag++;
 		u64_stats_update_end(&secy_stats->syncp);
+		secy->netdev->stats.rx_errors++;
 		goto drop_nosa;
 	}
 
@@ -1168,11 +1180,15 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
 		/* If validateFrames is Strict or the C bit in the
 		 * SecTAG is set, discard
 		 */
+		struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
 		if (hdr->tci_an & MACSEC_TCI_C ||
 		    secy->validate_frames == MACSEC_VALIDATE_STRICT) {
 			u64_stats_update_begin(&rxsc_stats->syncp);
 			rxsc_stats->stats.InPktsNotUsingSA++;
 			u64_stats_update_end(&rxsc_stats->syncp);
+			secy->netdev->stats.rx_errors++;
+			if (active_rx_sa)
+				this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
 			goto drop_nosa;
 		}
 
@@ -1182,6 +1198,8 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
 		u64_stats_update_begin(&rxsc_stats->syncp);
 		rxsc_stats->stats.InPktsUnusedSA++;
 		u64_stats_update_end(&rxsc_stats->syncp);
+		if (active_rx_sa)
+			this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
 		goto deliver;
 	}
 
@@ -1202,6 +1220,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
 			u64_stats_update_begin(&rxsc_stats->syncp);
 			rxsc_stats->stats.InPktsLate++;
 			u64_stats_update_end(&rxsc_stats->syncp);
+			macsec->secy.netdev->stats.rx_dropped++;
 			goto drop;
 		}
 	}
@@ -1230,6 +1249,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
 deliver:
 	macsec_finalize_skb(skb, secy->icv_len,
 			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
+	len = skb->len;
 	macsec_reset_skb(skb, secy->netdev);
 
 	if (rx_sa)
@@ -1237,7 +1257,6 @@ deliver:
 	macsec_rxsc_put(rx_sc);
 
 	skb_orphan(skb);
-	len = skb->len;
 	ret = gro_cells_receive(&macsec->gro_cells, skb);
 	if (ret == NET_RX_SUCCESS)
 		count_rx(dev, len);
@@ -1263,7 +1282,7 @@ nosci:
 	/* 10.6.1 if the SC is not found */
 	cbit = !!(hdr->tci_an & MACSEC_TCI_C);
 	if (!cbit)
-		macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
+		macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
 				    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
 
 	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
@@ -1279,6 +1298,7 @@ nosci:
 			u64_stats_update_begin(&secy_stats->syncp);
 			secy_stats->stats.InPktsNoSCI++;
 			u64_stats_update_end(&secy_stats->syncp);
+			macsec->secy.netdev->stats.rx_errors++;
 			continue;
 		}
 
@@ -1643,22 +1663,8 @@ static int macsec_offload(int (* const func)(struct macsec_context *),
 	if (ctx->offload == MACSEC_OFFLOAD_PHY)
 		mutex_lock(&ctx->phydev->lock);
 
-	/* Phase I: prepare. The drive should fail here if there are going to be
-	 * issues in the commit phase.
-	 */
-	ctx->prepare = true;
-	ret = (*func)(ctx);
-	if (ret)
-		goto phy_unlock;
-
-	/* Phase II: commit. This step cannot fail. */
-	ctx->prepare = false;
 	ret = (*func)(ctx);
-	/* This should never happen: commit is not allowed to fail */
-	if (unlikely(ret))
-		WARN(1, "MACsec offloading commit failed (%d)\n", ret);
 
-phy_unlock:
 	if (ctx->offload == MACSEC_OFFLOAD_PHY)
 		mutex_unlock(&ctx->phydev->lock);
 
@@ -1808,6 +1814,12 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
 
 	rx_sa->sc = rx_sc;
 
+	if (secy->xpn) {
+		rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
+		nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
+			   MACSEC_SALT_LEN);
+	}
+
 	/* If h/w offloading is available, propagate to the device */
 	if (macsec_is_offloaded(netdev_priv(dev))) {
 		const struct macsec_ops *ops;
@@ -1830,12 +1842,6 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
 			goto cleanup;
 	}
 
-	if (secy->xpn) {
-		rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
-		nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
-			   MACSEC_SALT_LEN);
-	}
-
 	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
 	rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
 
@@ -2050,6 +2056,12 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 	if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
 		secy->operational = true;
 
+	if (secy->xpn) {
+		tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
+		nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
+			   MACSEC_SALT_LEN);
+	}
+
 	/* If h/w offloading is available, propagate to the device */
 	if (macsec_is_offloaded(netdev_priv(dev))) {
 		const struct macsec_ops *ops;
@@ -2072,12 +2084,6 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
 			goto cleanup;
 	}
 
-	if (secy->xpn) {
-		tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
-		nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
-			   MACSEC_SALT_LEN);
-	}
-
 	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
 	rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
 
@@ -3370,6 +3376,7 @@ static struct genl_family macsec_fam __ro_after_init = {
 	.module		= THIS_MODULE,
 	.small_ops	= macsec_genl_ops,
 	.n_small_ops	= ARRAY_SIZE(macsec_genl_ops),
+	.resv_start_op	= MACSEC_CMD_UPD_OFFLOAD + 1,
 };
 
 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
@@ -3381,6 +3388,11 @@ static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
 	int ret, len;
 
 	if (macsec_is_offloaded(netdev_priv(dev))) {
+		struct metadata_dst *md_dst = secy->tx_sc.md_dst;
+
+		skb_dst_drop(skb);
+		dst_hold(&md_dst->dst);
+		skb_dst_set(skb, &md_dst->dst);
 		skb->dev = macsec->real_dev;
 		return dev_queue_xmit(skb);
 	}
@@ -3404,6 +3416,7 @@ static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
 		return NETDEV_TX_OK;
 	}
 
+	len = skb->len;
 	skb = macsec_encrypt(skb, dev);
 	if (IS_ERR(skb)) {
 		if (PTR_ERR(skb) != -EINPROGRESS)
@@ -3414,7 +3427,6 @@ static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
 	macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
 
 	macsec_encrypt_finish(skb, dev);
-	len = skb->len;
 	ret = dev_queue_xmit(skb);
 	count_tx(dev, ret, len);
 	return ret;
@@ -3622,7 +3634,6 @@ static int macsec_set_mac_address(struct net_device *dev, void *p)
 
 out:
 	eth_hw_addr_set(dev, addr->sa_data);
-	macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
 
 	/* If h/w offloading is available, propagate to the device */
 	if (macsec_is_offloaded(macsec)) {
@@ -3662,6 +3673,7 @@ static void macsec_get_stats64(struct net_device *dev,
 
 	s->rx_dropped = dev->stats.rx_dropped;
 	s->tx_dropped = dev->stats.tx_dropped;
+	s->rx_errors = dev->stats.rx_errors;
 }
 
 static int macsec_get_iflink(const struct net_device *dev)
@@ -3708,6 +3720,8 @@ static void macsec_free_netdev(struct net_device *dev)
 {
 	struct macsec_dev *macsec = macsec_priv(dev);
 
+	if (macsec->secy.tx_sc.md_dst)
+		metadata_dst_free(macsec->secy.tx_sc.md_dst);
 	free_percpu(macsec->stats);
 	free_percpu(macsec->secy.tx_sc.stats);
 
@@ -3960,6 +3974,11 @@ static bool sci_exists(struct net_device *dev, sci_t sci)
 	return false;
 }
 
+static sci_t dev_to_sci(struct net_device *dev, __be16 port)
+{
+	return make_sci(dev->dev_addr, port);
+}
+
 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
 {
 	struct macsec_dev *macsec = macsec_priv(dev);
@@ -3975,6 +3994,13 @@ static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
 		return -ENOMEM;
 	}
 
+	secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
+	if (!secy->tx_sc.md_dst) {
+		free_percpu(secy->tx_sc.stats);
+		free_percpu(macsec->stats);
+		return -ENOMEM;
+	}
+
 	if (sci == MACSEC_UNDEF_SCI)
 		sci = dev_to_sci(dev, MACSEC_PORT_ES);
 
@@ -3988,6 +4014,7 @@ static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
 	secy->xpn = DEFAULT_XPN;
 
 	secy->sci = sci;
+	secy->tx_sc.md_dst->u.macsec_info.sci = sci;
 	secy->tx_sc.active = true;
 	secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
 	secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
@@ -4006,7 +4033,7 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
 {
 	struct macsec_dev *macsec = macsec_priv(dev);
 	rx_handler_func_t *rx_handler;
-	u8 icv_len = DEFAULT_ICV_LEN;
+	u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
 	struct net_device *real_dev;
 	int err, mtu;
 	sci_t sci;
@@ -4130,7 +4157,7 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
 				struct netlink_ext_ack *extack)
 {
 	u64 csid = MACSEC_DEFAULT_CIPHER_ID;
-	u8 icv_len = DEFAULT_ICV_LEN;
+	u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
 	int flag;
 	bool es, scb, sci;
 
@@ -4142,7 +4169,7 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
 
 	if (data[IFLA_MACSEC_ICV_LEN]) {
 		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
-		if (icv_len != DEFAULT_ICV_LEN) {
+		if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
 			char dummy_key[DEFAULT_SAK_LEN] = { 0 };
 			struct crypto_aead *dummy_tfm;