io.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/* OpenVPN data channel offload
 3 *
 4 *  Copyright (C) 2019-2025 OpenVPN, Inc.
 5 *
 6 *  Author:	James Yonan <james@openvpn.net>
 7 *		Antonio Quartulli <antonio@openvpn.net>
 8 */
 9
10#ifndef _NET_OVPN_OVPN_H_
11#define _NET_OVPN_OVPN_H_
12
13/* DATA_V2 header size with AEAD encryption */
14#define OVPN_HEAD_ROOM (OVPN_OPCODE_SIZE + OVPN_NONCE_WIRE_SIZE +	   \
15			16 /* AEAD TAG length */ +			   \
16			max(sizeof(struct udphdr), sizeof(struct tcphdr)) +\
17			max(sizeof(struct ipv6hdr), sizeof(struct iphdr)))
18
19/* max padding required by encryption */
20#define OVPN_MAX_PADDING 16
21
22#define OVPN_KEEPALIVE_SIZE 16
23extern const unsigned char ovpn_keepalive_message[OVPN_KEEPALIVE_SIZE];
24
25netdev_tx_t ovpn_net_xmit(struct sk_buff *skb, struct net_device *dev);
26
27void ovpn_recv(struct ovpn_peer *peer, struct sk_buff *skb);
28void ovpn_xmit_special(struct ovpn_peer *peer, const void *data,
29		       const unsigned int len);
30
31void ovpn_encrypt_post(void *data, int ret);
32void ovpn_decrypt_post(void *data, int ret);
33
34#endif /* _NET_OVPN_OVPN_H_ */