79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
/*
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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 0x30 /* event in a L2 packet */
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#define PTP_CLASS_PMASK 0x30 /* mask for the packet type field */
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#define PTP_CLASS_VLAN 0x40 /* 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_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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