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79 lines
2.9 KiB
79 lines
2.9 KiB
/* |
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* PTP 1588 support |
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* |
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* This file implements a BPF that recognizes PTP event messages. |
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* |
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* Copyright (C) 2010 OMICRON electronics GmbH |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#ifndef _PTP_CLASSIFY_H_ |
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#define _PTP_CLASSIFY_H_ |
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#include <linux/ip.h> |
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#include <linux/skbuff.h> |
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#define PTP_CLASS_NONE 0x00 /* not a PTP event message */ |
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#define PTP_CLASS_V1 0x01 /* protocol version 1 */ |
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#define PTP_CLASS_V2 0x02 /* protocol version 2 */ |
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#define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */ |
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#define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */ |
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#define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */ |
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#define PTP_CLASS_L2 0x40 /* event in a L2 packet */ |
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#define PTP_CLASS_PMASK 0x70 /* mask for the packet type field */ |
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#define PTP_CLASS_VLAN 0x80 /* event in a VLAN tagged packet */ |
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#define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4) |
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#define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */ |
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#define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4) |
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#define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6) |
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#define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2) |
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#define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN) |
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#define PTP_CLASS_L4 (PTP_CLASS_IPV4 | PTP_CLASS_IPV6) |
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#define PTP_EV_PORT 319 |
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#define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */ |
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#define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */ |
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#define OFF_PTP_SEQUENCE_ID 30 |
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#define OFF_PTP_CONTROL 32 /* PTPv1 only */ |
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/* Below defines should actually be removed at some point in time. */ |
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#define IP6_HLEN 40 |
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#define UDP_HLEN 8 |
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#define OFF_IHL 14 |
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#define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2) |
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#if defined(CONFIG_NET_PTP_CLASSIFY) |
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/** |
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* ptp_classify_raw - classify a PTP packet |
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* @skb: buffer |
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* |
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* Runs a minimal BPF dissector to classify a network packet to |
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* determine the PTP class. In case the skb does not contain any |
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* PTP protocol data, PTP_CLASS_NONE will be returned, otherwise |
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* PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or |
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* PTP_CLASS_V2_{L2,VLAN}, depending on the packet content. |
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*/ |
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unsigned int ptp_classify_raw(const struct sk_buff *skb); |
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void __init ptp_classifier_init(void); |
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#else |
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static inline void ptp_classifier_init(void) |
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{ |
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} |
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#endif |
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#endif /* _PTP_CLASSIFY_H_ */
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