Re: [PATCH net-next v23 09/23] ovpn: implement packet processing

--- a/drivers/net/ovpn/io.c
+++ b/drivers/net/ovpn/io.c

@@ -7,6 +7,7 @@
  *		Antonio Quartulli <antonio@openvpn.net>
  */
 
+#include <crypto/aead.h>
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <net/gro_cells.h>

@@ -15,6 +16,9 @@
 #include "ovpnpriv.h"
 #include "peer.h"
 #include "io.h"
+#include "bind.h"
+#include "crypto.h"
+#include "crypto_aead.h"
 #include "netlink.h"
 #include "proto.h"
 #include "udp.h"

@@ -44,7 +48,7 @@ static void ovpn_netdev_write(struct ovpn_peer *peer, struct sk_buff *skb)
 	skb_set_queue_mapping(skb, 0);
 	skb_scrub_packet(skb, true);
 
-	skb_reset_network_header(skb);
+	/* network header reset in ovpn_decrypt_post() */
 	skb_reset_transport_header(skb);
 	skb_reset_inner_headers(skb);
 

@@ -56,34 +60,147 @@ static void ovpn_netdev_write(struct ovpn_peer *peer, struct sk_buff *skb)
 		dev_sw_netstats_rx_add(peer->ovpn->dev, pkt_len);
 }
 
-static void ovpn_decrypt_post(struct sk_buff *skb, int ret)
+void ovpn_decrypt_post(void *data, int ret)
 {
-	struct ovpn_peer *peer = ovpn_skb_cb(skb)->peer;
+	struct ovpn_crypto_key_slot *ks;
+	unsigned int payload_offset = 0;
+	struct sk_buff *skb = data;
+	struct ovpn_peer *peer;
+	__be16 proto;
+	__be32 *pid;
+
+	/* crypto is happening asynchronously. this function will be called
+	 * again later by the crypto callback with a proper return code
+	 */
+	if (unlikely(ret == -EINPROGRESS))
+		return;
+
+	payload_offset = ovpn_skb_cb(skb)->payload_offset;
+	ks = ovpn_skb_cb(skb)->ks;
+	peer = ovpn_skb_cb(skb)->peer;
+
+	/* crypto is done, cleanup skb CB and its members */
+
+	if (likely(ovpn_skb_cb(skb)->iv))
+		kfree(ovpn_skb_cb(skb)->iv);
+
+	if (likely(ovpn_skb_cb(skb)->sg))
+		kfree(ovpn_skb_cb(skb)->sg);
+
+	if (likely(ovpn_skb_cb(skb)->req))
+		aead_request_free(ovpn_skb_cb(skb)->req);
 
 	if (unlikely(ret < 0))
 		goto drop;
 
+	/* PID sits after the op */
+	pid = (__force __be32 *)(skb->data + OVPN_OPCODE_SIZE);
+	ret = ovpn_pktid_recv(&ks->pid_recv, ntohl(*pid), 0);
+	if (unlikely(ret < 0)) {
+		net_err_ratelimited("%s: PKT ID RX error for peer %u: %d\n",
+				    netdev_name(peer->ovpn->dev), peer->id,
+				    ret);
+		goto drop;
+	}
+
+	/* point to encapsulated IP packet */
+	__skb_pull(skb, payload_offset);
+
+	/* check if this is a valid datapacket that has to be delivered to the
+	 * ovpn interface
+	 */
+	skb_reset_network_header(skb);
+	proto = ovpn_ip_check_protocol(skb);
+	if (unlikely(!proto)) {
+		/* check if null packet */
+		if (unlikely(!pskb_may_pull(skb, 1))) {
+			net_info_ratelimited("%s: NULL packet received from peer %u\n",
+					     netdev_name(peer->ovpn->dev),
+					     peer->id);
+			goto drop;
+		}
+
+		net_info_ratelimited("%s: unsupported protocol received from peer %u\n",
+				     netdev_name(peer->ovpn->dev), peer->id);
+		goto drop;
+	}
+	skb->protocol = proto;
+
+	/* perform Reverse Path Filtering (RPF) */
+	if (unlikely(!ovpn_peer_check_by_src(peer->ovpn, skb, peer))) {
+		if (skb->protocol == htons(ETH_P_IPV6))
+			net_dbg_ratelimited("%s: RPF dropped packet from peer %u, src: %pI6c\n",
+					    netdev_name(peer->ovpn->dev),
+					    peer->id, &ipv6_hdr(skb)->saddr);
+		else
+			net_dbg_ratelimited("%s: RPF dropped packet from peer %u, src: %pI4\n",
+					    netdev_name(peer->ovpn->dev),
+					    peer->id, &ip_hdr(skb)->saddr);
+		goto drop;
+	}
+
 	ovpn_netdev_write(peer, skb);
 	/* skb is passed to upper layer - don't free it */
 	skb = NULL;
 drop:
 	if (unlikely(skb))
 		dev_core_stats_rx_dropped_inc(peer->ovpn->dev);
-	ovpn_peer_put(peer);
+	if (likely(peer))
+		ovpn_peer_put(peer);
+	if (likely(ks))
+		ovpn_crypto_key_slot_put(ks);
 	kfree_skb(skb);
 }
 
 /* RX path entry point: decrypt packet and forward it to the device */
 void ovpn_recv(struct ovpn_peer *peer, struct sk_buff *skb)
 {
-	ovpn_skb_cb(skb)->peer = peer;
-	ovpn_decrypt_post(skb, 0);
+	struct ovpn_crypto_key_slot *ks;
+	u8 key_id;
+
+	/* get the key slot matching the key ID in the received packet */
+	key_id = ovpn_key_id_from_skb(skb);
+	ks = ovpn_crypto_key_id_to_slot(&peer->crypto, key_id);
+	if (unlikely(!ks)) {
+		net_info_ratelimited("%s: no available key for peer %u, key-id: %u\n",
+				     netdev_name(peer->ovpn->dev), peer->id,
+				     key_id);
+		dev_core_stats_rx_dropped_inc(peer->ovpn->dev);
+		kfree_skb(skb);
+		ovpn_peer_put(peer);
+		return;
+	}
+
+	memset(ovpn_skb_cb(skb), 0, sizeof(struct ovpn_cb));
+	ovpn_decrypt_post(skb, ovpn_aead_decrypt(peer, ks, skb));
 }
 
-static void ovpn_encrypt_post(struct sk_buff *skb, int ret)
+void ovpn_encrypt_post(void *data, int ret)
 {
-	struct ovpn_peer *peer = ovpn_skb_cb(skb)->peer;
+	struct ovpn_crypto_key_slot *ks;
+	struct sk_buff *skb = data;
 	struct ovpn_socket *sock;
+	struct ovpn_peer *peer;
+
+	/* encryption is happening asynchronously. This function will be
+	 * called later by the crypto callback with a proper return value
+	 */
+	if (unlikely(ret == -EINPROGRESS))
+		return;
+
+	ks = ovpn_skb_cb(skb)->ks;
+	peer = ovpn_skb_cb(skb)->peer;
+
+	/* crypto is done, cleanup skb CB and its members */
+
+	if (likely(ovpn_skb_cb(skb)->iv))
+		kfree(ovpn_skb_cb(skb)->iv);
+
+	if (likely(ovpn_skb_cb(skb)->sg))
+		kfree(ovpn_skb_cb(skb)->sg);
+
+	if (likely(ovpn_skb_cb(skb)->req))
+		aead_request_free(ovpn_skb_cb(skb)->req);
 
 	if (unlikely(ret < 0))
 		goto err;

@@ -110,23 +227,40 @@ static void ovpn_encrypt_post(struct sk_buff *skb, int ret)
 err:
 	if (unlikely(skb))
 		dev_core_stats_tx_dropped_inc(peer->ovpn->dev);
-	ovpn_peer_put(peer);
+	if (likely(peer))
+		ovpn_peer_put(peer);
+	if (likely(ks))
+		ovpn_crypto_key_slot_put(ks);
 	kfree_skb(skb);
 }
 
 static bool ovpn_encrypt_one(struct ovpn_peer *peer, struct sk_buff *skb)
 {
-	ovpn_skb_cb(skb)->peer = peer;
+	struct ovpn_crypto_key_slot *ks;
+
+	if (unlikely(skb->ip_summed == CHECKSUM_PARTIAL &&

+		     skb_checksum_help(skb))) {
+		net_warn_ratelimited("%s: cannot compute checksum for outgoing packet for peer %u\n",
+				     netdev_name(peer->ovpn->dev), peer->id);
+		return false;
+	}
+
+	/* get primary key to be used for encrypting data */
+	ks = ovpn_crypto_key_slot_primary(&peer->crypto);
+	if (unlikely(!ks))
+		return false;
 
 	/* take a reference to the peer because the crypto code may run async.
 	 * ovpn_encrypt_post() will release it upon completion
 	 */
 	if (unlikely(!ovpn_peer_hold(peer))) {
 		DEBUG_NET_WARN_ON_ONCE(1);
+		ovpn_crypto_key_slot_put(ks);
 		return false;
 	}
 
-	ovpn_encrypt_post(skb, 0);
+	memset(ovpn_skb_cb(skb), 0, sizeof(struct ovpn_cb));
+	ovpn_encrypt_post(skb, ovpn_aead_encrypt(peer, ks, skb));
 	return true;
 }
 

diff --git a/drivers/net/ovpn/io.h b/drivers/net/ovpn/io.h
index 1cfa66873a2d4840ce57e337f8b4e8143e8b8e79..5143104b2c4b896a030ec4a8c8aea7015f40ef02 100644
--- a/drivers/net/ovpn/io.h
+++ b/drivers/net/ovpn/io.h

@@ -23,4 +23,7 @@ netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct net_device *dev);
 
 void ovpn_recv(struct ovpn_peer *peer, struct sk_buff *skb);
 
+void ovpn_encrypt_post(void *data, int ret);
+void ovpn_decrypt_post(void *data, int ret);
+
 #endif /* _NET_OVPN_OVPN_H_ */

diff --git a/drivers/net/ovpn/peer.c b/drivers/net/ovpn/peer.c
index 10eabd62ae7237162a36a333b41c748901a7d888..23eaab1b465b8b88a84cf9f1039621923b640b47 100644
--- a/drivers/net/ovpn/peer.c
+++ b/drivers/net/ovpn/peer.c

@@ -12,6 +12,8 @@
 
 #include "ovpnpriv.h"
 #include "bind.h"
+#include "pktid.h"
+#include "crypto.h"
 #include "io.h"
 #include "main.h"
 #include "netlink.h"

@@ -56,6 +58,7 @@ struct ovpn_peer *ovpn_peer_new(struct ovpn_priv *ovpn, u32 id)
 	peer->vpn_addrs.ipv6 = in6addr_any;
 
 	RCU_INIT_POINTER(peer->bind, NULL);
+	ovpn_crypto_state_init(&peer->crypto);
 	spin_lock_init(&peer->lock);
 	kref_init(&peer->refcount);
 

@@ -94,7 +97,10 @@ static void ovpn_peer_release_rcu(struct rcu_head *head)
  */
 static void ovpn_peer_release(struct ovpn_peer *peer)
 {
+	ovpn_crypto_state_release(&peer->crypto);
+	spin_lock_bh(&peer->lock);
 	ovpn_bind_reset(peer, NULL);
+	spin_unlock_bh(&peer->lock);
 	call_rcu(&peer->rcu, ovpn_peer_release_rcu);
 	netdev_put(peer->ovpn->dev, &peer->dev_tracker);
 }

@@ -326,6 +332,29 @@ struct ovpn_peer *ovpn_peer_get_by_dst(struct ovpn_priv *ovpn,
 	return peer;
 }
 
+/**
+ * ovpn_peer_check_by_src - check that skb source is routed via peer
+ * @ovpn: the openvpn instance to search
+ * @skb: the packet to extract source address from
+ * @peer: the peer to check against the source address
+ *
+ * Return: true if the peer is matching or false otherwise
+ */
+bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, struct sk_buff *skb,
+			    struct ovpn_peer *peer)
+{
+	bool match = false;
+
+	if (ovpn->mode == OVPN_MODE_P2P) {
+		/* in P2P mode, no matter the destination, packets are always
+		 * sent to the single peer listening on the other side
+		 */
+		match = (peer == rcu_access_pointer(ovpn->peer));
+	}
+
+	return match;
+}
+
 /**
  * ovpn_peer_add_p2p - add peer to related tables in a P2P instance
  * @ovpn: the instance to add the peer to

diff --git a/drivers/net/ovpn/peer.h b/drivers/net/ovpn/peer.h
index fef04311c1593db4ccfa3c417487b3d4faaae9d7..a9113a969f94d66fa17208d563d0bbd255c23fa9 100644
--- a/drivers/net/ovpn/peer.h
+++ b/drivers/net/ovpn/peer.h

@@ -12,6 +12,7 @@
 
 #include <net/dst_cache.h>
 
+#include "crypto.h"
 #include "socket.h"
 
 /**

@@ -23,6 +24,7 @@
  * @vpn_addrs.ipv4: IPv4 assigned to peer on the tunnel
  * @vpn_addrs.ipv6: IPv6 assigned to peer on the tunnel
  * @sock: the socket being used to talk to this peer
+ * @crypto: the crypto configuration (ciphers, keys, etc..)
  * @dst_cache: cache for dst_entry used to send to peer
  * @bind: remote peer binding
  * @delete_reason: why peer was deleted (i.e. timeout, transport error, ..)

@@ -40,6 +42,7 @@ struct ovpn_peer {
 		struct in6_addr ipv6;
 	} vpn_addrs;
 	struct ovpn_socket __rcu *sock;
+	struct ovpn_crypto_state crypto;
 	struct dst_cache dst_cache;
 	struct ovpn_bind __rcu *bind;
 	enum ovpn_del_peer_reason delete_reason;

@@ -82,5 +85,7 @@ struct ovpn_peer *ovpn_peer_get_by_transp_addr(struct ovpn_priv *ovpn,
 struct ovpn_peer *ovpn_peer_get_by_id(struct ovpn_priv *ovpn, u32 peer_id);
 struct ovpn_peer *ovpn_peer_get_by_dst(struct ovpn_priv *ovpn,
 				       struct sk_buff *skb);
+bool ovpn_peer_check_by_src(struct ovpn_priv *ovpn, struct sk_buff *skb,
+			    struct ovpn_peer *peer);
 
 #endif /* _NET_OVPN_OVPNPEER_H_ */

diff --git a/drivers/net/ovpn/pktid.c b/drivers/net/ovpn/pktid.c
new file mode 100644
index 0000000000000000000000000000000000000000..2e73d1c1ec8b6c4fe2fc10ebc1a4f3008362df21
--- /dev/null
+++ b/drivers/net/ovpn/pktid.c

@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+/*  OpenVPN data channel offload
+ *
+ *  Copyright (C) 2020-2025 OpenVPN, Inc.
+ *
+ *  Author:	Antonio Quartulli <antonio@openvpn.net>
+ *		James Yonan <james@openvpn.net>
+ */
+
+#include <linux/atomic.h>
+#include <linux/jiffies.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+
+#include "ovpnpriv.h"
+#include "main.h"
+#include "pktid.h"
+
+void ovpn_pktid_xmit_init(struct ovpn_pktid_xmit *pid)
+{
+	atomic64_set(&pid->seq_num, 1);
+}
+
+void ovpn_pktid_recv_init(struct ovpn_pktid_recv *pr)
+{
+	memset(pr, 0, sizeof(*pr));
+	spin_lock_init(&pr->lock);
+}
+
+/* Packet replay detection.
+ * Allows ID backtrack of up to REPLAY_WINDOW_SIZE - 1.
+ */
+int ovpn_pktid_recv(struct ovpn_pktid_recv *pr, u32 pkt_id, u32 pkt_time)
+{
+	const unsigned long now = jiffies;
+	int ret;
+
+	/* ID must not be zero */
+	if (unlikely(pkt_id == 0))
+		return -EINVAL;
+
+	spin_lock_bh(&pr->lock);
+
+	/* expire backtracks at or below pr->id after PKTID_RECV_EXPIRE time */
+	if (unlikely(time_after_eq(now, pr->expire)))
+		pr->id_floor = pr->id;
+
+	/* time changed? */
+	if (unlikely(pkt_time != pr->time)) {
+		if (pkt_time > pr->time) {
+			/* time moved forward, accept */
+			pr->base = 0;
+			pr->extent = 0;
+			pr->id = 0;
+			pr->time = pkt_time;
+			pr->id_floor = 0;
+		} else {
+			/* time moved backward, reject */
+			ret = -ETIME;
+			goto out;
+		}
+	}
+
+	if (likely(pkt_id == pr->id + 1)) {
+		/* well-formed ID sequence (incremented by 1) */
+		pr->base = REPLAY_INDEX(pr->base, -1);
+		pr->history[pr->base / 8] |= (1 << (pr->base % 8));
+		if (pr->extent < REPLAY_WINDOW_SIZE)
+			++pr->extent;
+		pr->id = pkt_id;
+	} else if (pkt_id > pr->id) {
+		/* ID jumped forward by more than one */
+		const unsigned int delta = pkt_id - pr->id;
+
+		if (delta < REPLAY_WINDOW_SIZE) {
+			unsigned int i;
+
+			pr->base = REPLAY_INDEX(pr->base, -delta);
+			pr->history[pr->base / 8] |= (1 << (pr->base % 8));
+			pr->extent += delta;
+			if (pr->extent > REPLAY_WINDOW_SIZE)
+				pr->extent = REPLAY_WINDOW_SIZE;
+			for (i = 1; i < delta; ++i) {
+				unsigned int newb = REPLAY_INDEX(pr->base, i);
+
+				pr->history[newb / 8] &= ~BIT(newb % 8);
+			}
+		} else {
+			pr->base = 0;
+			pr->extent = REPLAY_WINDOW_SIZE;
+			memset(pr->history, 0, sizeof(pr->history));
+			pr->history[0] = 1;
+		}
+		pr->id = pkt_id;
+	} else {
+		/* ID backtrack */
+		const unsigned int delta = pr->id - pkt_id;
+
+		if (delta > pr->max_backtrack)
+			pr->max_backtrack = delta;
+		if (delta < pr->extent) {
+			if (pkt_id > pr->id_floor) {
+				const unsigned int ri = REPLAY_INDEX(pr->base,
+								     delta);
+				u8 *p = &pr->history[ri / 8];
+				const u8 mask = (1 << (ri % 8));
+
+				if (*p & mask) {
+					ret = -EINVAL;
+					goto out;
+				}
+				*p |= mask;
+			} else {
+				ret = -EINVAL;
+				goto out;
+			}
+		} else {
+			ret = -EINVAL;
+			goto out;
+		}
+	}
+
+	pr->expire = now + PKTID_RECV_EXPIRE;
+	ret = 0;
+out:
+	spin_unlock_bh(&pr->lock);
+	return ret;
+}

diff --git a/drivers/net/ovpn/pktid.h b/drivers/net/ovpn/pktid.h
new file mode 100644
index 0000000000000000000000000000000000000000..0e5fd91d488359f675f500a7368027f7a148f5c6
--- /dev/null
+++ b/drivers/net/ovpn/pktid.h

@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*  OpenVPN data channel offload
+ *
+ *  Copyright (C) 2020-2025 OpenVPN, Inc.
+ *
+ *  Author:	Antonio Quartulli <antonio@openvpn.net>
+ *		James Yonan <james@openvpn.net>
+ */
+
+#ifndef _NET_OVPN_OVPNPKTID_H_
+#define _NET_OVPN_OVPNPKTID_H_
+
+#include "proto.h"
+
+/* If no packets received for this length of time, set a backtrack floor
+ * at highest received packet ID thus far.
+ */
+#define PKTID_RECV_EXPIRE (30 * HZ)
+
+/* Packet-ID state for transmitter */
+struct ovpn_pktid_xmit {
+	atomic64_t seq_num;
+};
+
+/* replay window sizing in bytes = 2^REPLAY_WINDOW_ORDER */
+#define REPLAY_WINDOW_ORDER 8
+
+#define REPLAY_WINDOW_BYTES BIT(REPLAY_WINDOW_ORDER)
+#define REPLAY_WINDOW_SIZE  (REPLAY_WINDOW_BYTES * 8)
+#define REPLAY_INDEX(base, i) (((base) + (i)) & (REPLAY_WINDOW_SIZE - 1))
+
+/* Packet-ID state for receiver.
+ * Other than lock member, can be zeroed to initialize.
+ */
+struct ovpn_pktid_recv {
+	/* "sliding window" bitmask of recent packet IDs received */
+	u8 history[REPLAY_WINDOW_BYTES];
+	/* bit position of deque base in history */
+	unsigned int base;
+	/* extent (in bits) of deque in history */
+	unsigned int extent;
+	/* expiration of history in jiffies */
+	unsigned long expire;
+	/* highest sequence number received */
+	u32 id;
+	/* highest time stamp received */
+	u32 time;
+	/* we will only accept backtrack IDs > id_floor */
+	u32 id_floor;
+	unsigned int max_backtrack;
+	/* protects entire pktd ID state */
+	spinlock_t lock;
+};
+
+/* Get the next packet ID for xmit */
+static inline int ovpn_pktid_xmit_next(struct ovpn_pktid_xmit *pid, u32 *pktid)
+{
+	const s64 seq_num = atomic64_fetch_add_unless(&pid->seq_num, 1,
+						      0x100000000LL);
+	/* when the 32bit space is over, we return an error because the packet
+	 * ID is used to create the cipher IV and we do not want to reuse the
+	 * same value more than once
+	 */
+	if (unlikely(seq_num == 0x100000000LL))
+		return -ERANGE;
+
+	*pktid = (u32)seq_num;
+
+	return 0;
+}
+
+/* Write 12-byte AEAD IV to dest */
+static inline void ovpn_pktid_aead_write(const u32 pktid,
+					 const u8 nt[],
+					 unsigned char *dest)
+{
+	*(__force __be32 *)(dest) = htonl(pktid);
+	BUILD_BUG_ON(4 + OVPN_NONCE_TAIL_SIZE != OVPN_NONCE_SIZE);
+	memcpy(dest + 4, nt, OVPN_NONCE_TAIL_SIZE);
+}
+
+void ovpn_pktid_xmit_init(struct ovpn_pktid_xmit *pid);
+void ovpn_pktid_recv_init(struct ovpn_pktid_recv *pr);
+
+int ovpn_pktid_recv(struct ovpn_pktid_recv *pr, u32 pkt_id, u32 pkt_time);
+
+#endif /* _NET_OVPN_OVPNPKTID_H_ */

diff --git a/drivers/net/ovpn/proto.h b/drivers/net/ovpn/proto.h
index 591b97a9925fd9b91f996d6d591fac41b1aa6148..b7322c7c515e5c0744719e11ca81fece3ca28569 100644
--- a/drivers/net/ovpn/proto.h
+++ b/drivers/net/ovpn/proto.h

@@ -83,4 +83,36 @@ static inline u32 ovpn_peer_id_from_skb(const struct sk_buff *skb, u16 offset)
 	return FIELD_GET(OVPN_OPCODE_PEERID_MASK, opcode);
 }
 
+/**
+ * ovpn_key_id_from_skb - extract key ID from the skb head
+ * @skb: the packet to extract the key ID code from
+ *
+ * Note: this function assumes that the skb head was pulled enough
+ * to access the first byte.
+ *
+ * Return: the key ID
+ */
+static inline u8 ovpn_key_id_from_skb(const struct sk_buff *skb)
+{
+	u32 opcode = be32_to_cpu(*(__be32 *)skb->data);
+
+	return FIELD_GET(OVPN_OPCODE_KEYID_MASK, opcode);
+}
+
+/**
+ * ovpn_opcode_compose - combine OP code, key ID and peer ID to wire format
+ * @opcode: the OP code
+ * @key_id: the key ID
+ * @peer_id: the peer ID
+ *
+ * Return: a 4 bytes integer obtained combining all input values following the
+ * OpenVPN wire format. This integer can then be written to the packet header.
+ */
+static inline u32 ovpn_opcode_compose(u8 opcode, u8 key_id, u32 peer_id)
+{
+	return FIELD_PREP(OVPN_OPCODE_PKTTYPE_MASK, opcode) |
+	       FIELD_PREP(OVPN_OPCODE_KEYID_MASK, key_id) |
+	       FIELD_PREP(OVPN_OPCODE_PEERID_MASK, peer_id);
+}
+
 #endif /* _NET_OVPN_OVPNPROTO_H_ */

diff --git a/drivers/net/ovpn/skb.h b/drivers/net/ovpn/skb.h
index 9db7a9adebdb4cc493f162f89fb2e9c6301fa213..bd3cbcfc770d2c28d234fcdd081b4d02e6496ea0 100644
--- a/drivers/net/ovpn/skb.h
+++ b/drivers/net/ovpn/skb.h

@@ -20,6 +20,11 @@
 
 struct ovpn_cb {
 	struct ovpn_peer *peer;
+	struct ovpn_crypto_key_slot *ks;
+	struct aead_request *req;
+	struct scatterlist *sg;
+	u8 *iv;
+	unsigned int payload_offset;
 };
 
 static inline struct ovpn_cb *ovpn_skb_cb(struct sk_buff *skb)

-- 
2.48.1