71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* PTP 1588 support
|
|
*
|
|
* This file implements a BPF that recognizes PTP event messages.
|
|
*
|
|
* Copyright (C) 2010 OMICRON electronics GmbH
|
|
*/
|
|
|
|
#ifndef _PTP_CLASSIFY_H_
|
|
#define _PTP_CLASSIFY_H_
|
|
|
|
#include <linux/ip.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
#define PTP_CLASS_NONE 0x00 /* not a PTP event message */
|
|
#define PTP_CLASS_V1 0x01 /* protocol version 1 */
|
|
#define PTP_CLASS_V2 0x02 /* protocol version 2 */
|
|
#define PTP_CLASS_VMASK 0x0f /* max protocol version is 15 */
|
|
#define PTP_CLASS_IPV4 0x10 /* event in an IPV4 UDP packet */
|
|
#define PTP_CLASS_IPV6 0x20 /* event in an IPV6 UDP packet */
|
|
#define PTP_CLASS_L2 0x40 /* event in a L2 packet */
|
|
#define PTP_CLASS_PMASK 0x70 /* mask for the packet type field */
|
|
#define PTP_CLASS_VLAN 0x80 /* event in a VLAN tagged packet */
|
|
|
|
#define PTP_CLASS_V1_IPV4 (PTP_CLASS_V1 | PTP_CLASS_IPV4)
|
|
#define PTP_CLASS_V1_IPV6 (PTP_CLASS_V1 | PTP_CLASS_IPV6) /* probably DNE */
|
|
#define PTP_CLASS_V2_IPV4 (PTP_CLASS_V2 | PTP_CLASS_IPV4)
|
|
#define PTP_CLASS_V2_IPV6 (PTP_CLASS_V2 | PTP_CLASS_IPV6)
|
|
#define PTP_CLASS_V2_L2 (PTP_CLASS_V2 | PTP_CLASS_L2)
|
|
#define PTP_CLASS_V2_VLAN (PTP_CLASS_V2 | PTP_CLASS_VLAN)
|
|
#define PTP_CLASS_L4 (PTP_CLASS_IPV4 | PTP_CLASS_IPV6)
|
|
|
|
#define PTP_EV_PORT 319
|
|
#define PTP_GEN_BIT 0x08 /* indicates general message, if set in message type */
|
|
|
|
#define OFF_PTP_SOURCE_UUID 22 /* PTPv1 only */
|
|
#define OFF_PTP_SEQUENCE_ID 30
|
|
#define OFF_PTP_CONTROL 32 /* PTPv1 only */
|
|
|
|
/* Below defines should actually be removed at some point in time. */
|
|
#define IP6_HLEN 40
|
|
#define UDP_HLEN 8
|
|
#define OFF_IHL 14
|
|
#define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2)
|
|
|
|
#if defined(CONFIG_NET_PTP_CLASSIFY)
|
|
/**
|
|
* ptp_classify_raw - classify a PTP packet
|
|
* @skb: buffer
|
|
*
|
|
* Runs a minimal BPF dissector to classify a network packet to
|
|
* determine the PTP class. In case the skb does not contain any
|
|
* PTP protocol data, PTP_CLASS_NONE will be returned, otherwise
|
|
* PTP_CLASS_V1_IPV{4,6}, PTP_CLASS_V2_IPV{4,6} or
|
|
* PTP_CLASS_V2_{L2,VLAN}, depending on the packet content.
|
|
*/
|
|
unsigned int ptp_classify_raw(const struct sk_buff *skb);
|
|
|
|
void __init ptp_classifier_init(void);
|
|
#else
|
|
static inline void ptp_classifier_init(void)
|
|
{
|
|
}
|
|
static inline unsigned int ptp_classify_raw(struct sk_buff *skb)
|
|
{
|
|
return PTP_CLASS_NONE;
|
|
}
|
|
#endif
|
|
#endif /* _PTP_CLASSIFY_H_ */
|