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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/ptp_classify.h
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@@ -1,23 +1,10 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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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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@@ -49,13 +36,36 @@
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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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39
 
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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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+
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+struct clock_identity {
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+	u8 id[8];
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+} __packed;
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+
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+struct port_identity {
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+	struct clock_identity	clock_identity;
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+	__be16			port_number;
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+} __packed;
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+
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+struct ptp_header {
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+	u8			tsmt;  /* transportSpecific | messageType */
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+	u8			ver;   /* reserved          | versionPTP  */
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+	__be16			message_length;
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+	u8			domain_number;
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+	u8			reserved1;
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+	u8			flag_field[2];
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+	__be64			correction;
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+	__be32			reserved2;
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+	struct port_identity	source_port_identity;
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+	__be16			sequence_id;
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+	u8			control;
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+	u8			log_message_interval;
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+} __packed;
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 #if defined(CONFIG_NET_PTP_CLASSIFY)
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 /**
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@@ -70,6 +80,46 @@
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  */
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 unsigned int ptp_classify_raw(const struct sk_buff *skb);
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+/**
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+ * ptp_parse_header - Get pointer to the PTP v2 header
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+ * @skb: packet buffer
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+ * @type: type of the packet (see ptp_classify_raw())
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+ *
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+ * This function takes care of the VLAN, UDP, IPv4 and IPv6 headers. The length
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+ * is checked.
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+ *
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+ * Note, internally skb_mac_header() is used. Make sure that the @skb is
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+ * initialized accordingly.
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+ *
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+ * Return: Pointer to the ptp v2 header or NULL if not found
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+ */
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+struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type);
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+
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+/**
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+ * ptp_get_msgtype - Extract ptp message type from given header
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+ * @hdr: ptp header
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+ * @type: type of the packet (see ptp_classify_raw())
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+ *
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+ * This function returns the message type for a given ptp header. It takes care
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+ * of the different ptp header versions (v1 or v2).
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+ *
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+ * Return: The message type
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+ */
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+static inline u8 ptp_get_msgtype(const struct ptp_header *hdr,
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+				 unsigned int type)
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+{
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+	u8 msgtype;
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+
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+	if (unlikely(type & PTP_CLASS_V1)) {
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+		/* msg type is located at the control field for ptp v1 */
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+		msgtype = hdr->control;
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+	} else {
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+		msgtype = hdr->tsmt & 0x0f;
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+	}
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+
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+	return msgtype;
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+}
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+
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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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 	return PTP_CLASS_NONE;
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 }
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+static inline struct ptp_header *ptp_parse_header(struct sk_buff *skb,
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+						  unsigned int type)
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+{
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+	return NULL;
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+}
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+static inline u8 ptp_get_msgtype(const struct ptp_header *hdr,
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+				 unsigned int type)
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+{
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+	/* The return is meaningless. The stub function would not be
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+	 * executed since no available header from ptp_parse_header.
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+	 */
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+	return 0;
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+}
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 #endif
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 #endif /* _PTP_CLASSIFY_H_ */