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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/* OpenVPN data channel offload
3 *
4 * Copyright (C) 2020-2025 OpenVPN, Inc.
5 *
6 * Author: Antonio Quartulli <antonio@openvpn.net>
7 * James Yonan <james@openvpn.net>
8 */
9
10#ifndef _NET_OVPN_SKB_H_
11#define _NET_OVPN_SKB_H_
12
13#include <linux/in.h>
14#include <linux/in6.h>
15#include <linux/ip.h>
16#include <linux/ipv6.h>
17#include <linux/skbuff.h>
18#include <linux/socket.h>
19#include <linux/types.h>
20
21struct ovpn_cb {
22 struct ovpn_peer *peer;
23 struct ovpn_crypto_key_slot *ks;
24 struct aead_request *req;
25 struct scatterlist *sg;
26 u8 *iv;
27 unsigned int payload_offset;
28 bool nosignal;
29};
30
31static inline struct ovpn_cb *ovpn_skb_cb(struct sk_buff *skb)
32{
33 BUILD_BUG_ON(sizeof(struct ovpn_cb) > sizeof(skb->cb));
34 return (struct ovpn_cb *)skb->cb;
35}
36
37/* Return IP protocol version from skb header.
38 * Return 0 if protocol is not IPv4/IPv6 or cannot be read.
39 */
40static inline __be16 ovpn_ip_check_protocol(struct sk_buff *skb)
41{
42 __be16 proto = 0;
43
44 /* skb could be non-linear,
45 * make sure IP header is in non-fragmented part
46 */
47 if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
48 return 0;
49
50 if (ip_hdr(skb)->version == 4) {
51 proto = htons(ETH_P_IP);
52 } else if (ip_hdr(skb)->version == 6) {
53 if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
54 return 0;
55 proto = htons(ETH_P_IPV6);
56 }
57
58 return proto;
59}
60
61#endif /* _NET_OVPN_SKB_H_ */