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74ba9207 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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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 | |
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8 | */ |
9 | ||
10 | #ifndef _PTP_CLASSIFY_H_ | |
11 | #define _PTP_CLASSIFY_H_ | |
12 | ||
d94ba80e | 13 | #include <linux/ip.h> |
408eccce | 14 | #include <linux/skbuff.h> |
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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 */ | |
5f94c943 SS |
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 */ | |
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25 | |
26 | #define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4) | |
408eccce | 27 | #define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */ |
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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) | |
5f94c943 | 32 | #define PTP_CLASS_L4 (PTP_CLASS_IPV4 | PTP_CLASS_IPV6) |
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33 | |
34 | #define PTP_EV_PORT 319 | |
f75159e9 | 35 | #define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */ |
15f0127d | 36 | |
d94ba80e RC |
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 | ||
408eccce | 41 | /* Below defines should actually be removed at some point in time. */ |
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42 | #define IP6_HLEN 40 |
43 | #define UDP_HLEN 8 | |
408eccce | 44 | #define OFF_IHL 14 |
408eccce | 45 | #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2) |
15f0127d | 46 | |
408eccce DB |
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 | */ | |
164d8c66 DB |
58 | unsigned int ptp_classify_raw(const struct sk_buff *skb); |
59 | ||
408eccce DB |
60 | void __init ptp_classifier_init(void); |
61 | #else | |
62 | static inline void ptp_classifier_init(void) | |
63 | { | |
64 | } | |
052fddfb AL |
65 | static inline unsigned int ptp_classify_raw(struct sk_buff *skb) |
66 | { | |
67 | return PTP_CLASS_NONE; | |
68 | } | |
15f0127d | 69 | #endif |
408eccce | 70 | #endif /* _PTP_CLASSIFY_H_ */ |