mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
076d38b88c
Using PTP wide defines will obsolete different driver internal defines and uses of magic numbers. Signed-off-by: Christian Eggers <ceggers@arri.de> Cc: Kurt Kanzenbach <kurt@linutronix.de> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
151 lines
4.4 KiB
C
151 lines
4.4 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_MSGTYPE_SYNC 0x0
|
|
#define PTP_MSGTYPE_DELAY_REQ 0x1
|
|
#define PTP_MSGTYPE_PDELAY_REQ 0x2
|
|
#define PTP_MSGTYPE_PDELAY_RESP 0x3
|
|
|
|
#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
|
|
|
|
/* 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)
|
|
|
|
struct clock_identity {
|
|
u8 id[8];
|
|
} __packed;
|
|
|
|
struct port_identity {
|
|
struct clock_identity clock_identity;
|
|
__be16 port_number;
|
|
} __packed;
|
|
|
|
struct ptp_header {
|
|
u8 tsmt; /* transportSpecific | messageType */
|
|
u8 ver; /* reserved | versionPTP */
|
|
__be16 message_length;
|
|
u8 domain_number;
|
|
u8 reserved1;
|
|
u8 flag_field[2];
|
|
__be64 correction;
|
|
__be32 reserved2;
|
|
struct port_identity source_port_identity;
|
|
__be16 sequence_id;
|
|
u8 control;
|
|
u8 log_message_interval;
|
|
} __packed;
|
|
|
|
#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);
|
|
|
|
/**
|
|
* ptp_parse_header - Get pointer to the PTP v2 header
|
|
* @skb: packet buffer
|
|
* @type: type of the packet (see ptp_classify_raw())
|
|
*
|
|
* This function takes care of the VLAN, UDP, IPv4 and IPv6 headers. The length
|
|
* is checked.
|
|
*
|
|
* Note, internally skb_mac_header() is used. Make sure that the @skb is
|
|
* initialized accordingly.
|
|
*
|
|
* Return: Pointer to the ptp v2 header or NULL if not found
|
|
*/
|
|
struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type);
|
|
|
|
/**
|
|
* ptp_get_msgtype - Extract ptp message type from given header
|
|
* @hdr: ptp header
|
|
* @type: type of the packet (see ptp_classify_raw())
|
|
*
|
|
* This function returns the message type for a given ptp header. It takes care
|
|
* of the different ptp header versions (v1 or v2).
|
|
*
|
|
* Return: The message type
|
|
*/
|
|
static inline u8 ptp_get_msgtype(const struct ptp_header *hdr,
|
|
unsigned int type)
|
|
{
|
|
u8 msgtype;
|
|
|
|
if (unlikely(type & PTP_CLASS_V1)) {
|
|
/* msg type is located at the control field for ptp v1 */
|
|
msgtype = hdr->control;
|
|
} else {
|
|
msgtype = hdr->tsmt & 0x0f;
|
|
}
|
|
|
|
return msgtype;
|
|
}
|
|
|
|
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;
|
|
}
|
|
static inline struct ptp_header *ptp_parse_header(struct sk_buff *skb,
|
|
unsigned int type)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline u8 ptp_get_msgtype(const struct ptp_header *hdr,
|
|
unsigned int type)
|
|
{
|
|
/* The return is meaningless. The stub function would not be
|
|
* executed since no available header from ptp_parse_header.
|
|
*/
|
|
return PTP_MSGTYPE_SYNC;
|
|
}
|
|
#endif
|
|
#endif /* _PTP_CLASSIFY_H_ */
|