v4.19.13 snapshot.
diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h
new file mode 100644
index 0000000..0592420
--- /dev/null
+++ b/include/linux/ptp_classify.h
@@ -0,0 +1,83 @@
+/*
+ * PTP 1588 support
+ *
+ * This file implements a BPF that recognizes PTP event messages.
+ *
+ * Copyright (C) 2010 OMICRON electronics GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#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_ */