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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * PTP 1588 support
4 *
5 * This file implements a BPF that recognizes PTP event messages.
6 *
7 * Copyright (C) 2010 OMICRON electronics GmbH
8 */
9
10#ifndef _PTP_CLASSIFY_H_
11#define _PTP_CLASSIFY_H_
12
13#include <linux/ip.h>
14#include <linux/skbuff.h>
15
16#define PTP_CLASS_NONE 0x00 /* not a PTP event message */
17#define PTP_CLASS_V1 0x01 /* protocol version 1 */
18#define PTP_CLASS_V2 0x02 /* protocol version 2 */
19#define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */
20#define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */
21#define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */
22#define PTP_CLASS_L2 0x40 /* event in a L2 packet */
23#define PTP_CLASS_PMASK 0x70 /* mask for the packet type field */
24#define PTP_CLASS_VLAN 0x80 /* event in a VLAN tagged packet */
25
26#define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4)
27#define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */
28#define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4)
29#define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6)
30#define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2)
31#define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN)
32#define PTP_CLASS_L4 (PTP_CLASS_IPV4 | PTP_CLASS_IPV6)
33
34#define PTP_EV_PORT 319
35#define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */
36
37#define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */
38#define OFF_PTP_SEQUENCE_ID 30
39#define OFF_PTP_CONTROL 32 /* PTPv1 only */
40
41/* Below defines should actually be removed at some point in time. */
42#define IP6_HLEN 40
43#define UDP_HLEN 8
44#define OFF_IHL 14
45#define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2)
46
47#if defined(CONFIG_NET_PTP_CLASSIFY)
48/**
49 * ptp_classify_raw - classify a PTP packet
50 * @skb: buffer
51 *
52 * Runs a minimal BPF dissector to classify a network packet to
53 * determine the PTP class. In case the skb does not contain any
54 * PTP protocol data, PTP_CLASS_NONE will be returned, otherwise
55 * PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or
56 * PTP_CLASS_V2_{L2,VLAN}, depending on the packet content.
57 */
58unsigned int ptp_classify_raw(const struct sk_buff *skb);
59
60void __init ptp_classifier_init(void);
61#else
62static inline void ptp_classifier_init(void)
63{
64}
65static inline unsigned int ptp_classify_raw(struct sk_buff *skb)
66{
67 return PTP_CLASS_NONE;
68}
69#endif
70#endif /* _PTP_CLASSIFY_H_ */