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15f0127d RC |
1 | /* |
2 | * PTP 1588 support | |
3 | * | |
4 | * This file implements a BPF that recognizes PTP event messages. | |
5 | * | |
6 | * Copyright (C) 2010 OMICRON electronics GmbH | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
23 | #ifndef _PTP_CLASSIFY_H_ | |
24 | #define _PTP_CLASSIFY_H_ | |
25 | ||
d94ba80e | 26 | #include <linux/ip.h> |
408eccce | 27 | #include <linux/skbuff.h> |
15f0127d RC |
28 | |
29 | #define PTP_CLASS_NONE 0x00 /* not a PTP event message */ | |
30 | #define PTP_CLASS_V1 0x01 /* protocol version 1 */ | |
31 | #define PTP_CLASS_V2 0x02 /* protocol version 2 */ | |
32 | #define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */ | |
33 | #define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */ | |
34 | #define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */ | |
35 | #define PTP_CLASS_L2 0x30 /* event in a L2 packet */ | |
ae5c6c6d SS |
36 | #define PTP_CLASS_PMASK 0x30 /* mask for the packet type field */ |
37 | #define PTP_CLASS_VLAN 0x40 /* event in a VLAN tagged packet */ | |
15f0127d RC |
38 | |
39 | #define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4) | |
408eccce | 40 | #define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */ |
15f0127d RC |
41 | #define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4) |
42 | #define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6) | |
43 | #define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2) | |
44 | #define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN) | |
45 | ||
46 | #define PTP_EV_PORT 319 | |
f75159e9 | 47 | #define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */ |
15f0127d | 48 | |
d94ba80e RC |
49 | #define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */ |
50 | #define OFF_PTP_SEQUENCE_ID 30 | |
51 | #define OFF_PTP_CONTROL 32 /* PTPv1 only */ | |
52 | ||
408eccce | 53 | /* Below defines should actually be removed at some point in time. */ |
15f0127d RC |
54 | #define IP6_HLEN 40 |
55 | #define UDP_HLEN 8 | |
408eccce | 56 | #define OFF_IHL 14 |
408eccce | 57 | #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2) |
15f0127d | 58 | |
408eccce DB |
59 | #if defined(CONFIG_NET_PTP_CLASSIFY) |
60 | /** | |
61 | * ptp_classify_raw - classify a PTP packet | |
62 | * @skb: buffer | |
63 | * | |
64 | * Runs a minimal BPF dissector to classify a network packet to | |
65 | * determine the PTP class. In case the skb does not contain any | |
66 | * PTP protocol data, PTP_CLASS_NONE will be returned, otherwise | |
67 | * PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or | |
68 | * PTP_CLASS_V2_{L2,VLAN}, depending on the packet content. | |
69 | */ | |
164d8c66 DB |
70 | unsigned int ptp_classify_raw(const struct sk_buff *skb); |
71 | ||
408eccce DB |
72 | void __init ptp_classifier_init(void); |
73 | #else | |
74 | static inline void ptp_classifier_init(void) | |
75 | { | |
76 | } | |
15f0127d | 77 | #endif |
408eccce | 78 | #endif /* _PTP_CLASSIFY_H_ */ |