diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h
new file mode 100644
index 0000000..e68efc3
--- /dev/null
+++ b/include/linux/ptp_classify.h
@@ -0,0 +1,118 @@
+/*
+ * 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/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/filter.h>
+#ifdef __KERNEL__
+#include <linux/in.h>
+#else
+#include <netinet/in.h>
+#endif
+
+#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    0x30 /* event in a L2 packet */
+#define PTP_CLASS_VLAN  0x40 /* event in a VLAN tagged L2 packet */
+#define PTP_CLASS_PMASK 0xf0 /* mask for the packet type field */
+
+#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_EV_PORT 319
+
+#define OFF_ETYPE	12
+#define OFF_IHL		14
+#define OFF_FRAG	20
+#define OFF_PROTO4	23
+#define OFF_NEXT	6
+#define OFF_UDP_DST	2
+
+#define IP6_HLEN	40
+#define UDP_HLEN	8
+
+#define RELOFF_DST4	(ETH_HLEN + OFF_UDP_DST)
+#define OFF_DST6	(ETH_HLEN + IP6_HLEN + OFF_UDP_DST)
+#define OFF_PTP6	(ETH_HLEN + IP6_HLEN + UDP_HLEN)
+
+#define OP_AND	(BPF_ALU | BPF_AND  | BPF_K)
+#define OP_JEQ	(BPF_JMP | BPF_JEQ  | BPF_K)
+#define OP_JSET	(BPF_JMP | BPF_JSET | BPF_K)
+#define OP_LDB	(BPF_LD  | BPF_B    | BPF_ABS)
+#define OP_LDH	(BPF_LD  | BPF_H    | BPF_ABS)
+#define OP_LDHI	(BPF_LD  | BPF_H    | BPF_IND)
+#define OP_LDX	(BPF_LDX | BPF_B    | BPF_MSH)
+#define OP_OR	(BPF_ALU | BPF_OR   | BPF_K)
+#define OP_RETA	(BPF_RET | BPF_A)
+#define OP_RETK	(BPF_RET | BPF_K)
+
+#define PTP_FILTER \
+	{OP_LDH,	0,   0, OFF_ETYPE		}, /*              */ \
+	{OP_JEQ,	0,  12, ETH_P_IP		}, /* f goto L20   */ \
+	{OP_LDB,	0,   0, OFF_PROTO4		}, /*              */ \
+	{OP_JEQ,	0,   9, IPPROTO_UDP		}, /* f goto L10   */ \
+	{OP_LDH,	0,   0, OFF_FRAG		}, /*              */ \
+	{OP_JSET,	7,   0, 0x1fff			}, /* t goto L11   */ \
+	{OP_LDX,	0,   0, OFF_IHL			}, /*              */ \
+	{OP_LDHI,	0,   0, RELOFF_DST4		}, /*              */ \
+	{OP_JEQ,	0,   4, PTP_EV_PORT		}, /* f goto L12   */ \
+	{OP_LDHI,	0,   0, ETH_HLEN + UDP_HLEN	}, /*              */ \
+	{OP_AND,	0,   0, PTP_CLASS_VMASK		}, /*              */ \
+	{OP_OR,		0,   0, PTP_CLASS_IPV4		}, /*              */ \
+	{OP_RETA,	0,   0, 0			}, /*              */ \
+/*L1x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		}, /*              */ \
+/*L20*/	{OP_JEQ,	0,   9, ETH_P_IPV6		}, /* f goto L40   */ \
+	{OP_LDB,	0,   0, ETH_HLEN + OFF_NEXT	}, /*              */ \
+	{OP_JEQ,	0,   6, IPPROTO_UDP		}, /* f goto L30   */ \
+	{OP_LDH,	0,   0, OFF_DST6		}, /*              */ \
+	{OP_JEQ,	0,   4, PTP_EV_PORT		}, /* f goto L31   */ \
+	{OP_LDH,	0,   0, OFF_PTP6		}, /*              */ \
+	{OP_AND,	0,   0, PTP_CLASS_VMASK		}, /*              */ \
+	{OP_OR,		0,   0, PTP_CLASS_IPV6		}, /*              */ \
+	{OP_RETA,	0,   0, 0			}, /*              */ \
+/*L3x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		}, /*              */ \
+/*L40*/	{OP_JEQ,	0,   6, ETH_P_8021Q		}, /* f goto L50   */ \
+	{OP_LDH,	0,   0, OFF_ETYPE + 4		}, /*              */ \
+	{OP_JEQ,	0,   9, ETH_P_1588		}, /* f goto L60   */ \
+	{OP_LDH,	0,   0, ETH_HLEN + VLAN_HLEN	}, /*              */ \
+	{OP_AND,	0,   0, PTP_CLASS_VMASK		}, /*              */ \
+	{OP_OR,		0,   0, PTP_CLASS_VLAN		}, /*              */ \
+	{OP_RETA,	0,   0, 0			}, /*              */ \
+/*L50*/	{OP_JEQ,	0,   4, ETH_P_1588		}, /* f goto L61   */ \
+	{OP_LDH,	0,   0, ETH_HLEN		}, /*              */ \
+	{OP_AND,	0,   0, PTP_CLASS_VMASK		}, /*              */ \
+	{OP_OR,		0,   0, PTP_CLASS_L2		}, /*              */ \
+	{OP_RETA,	0,   0, 0			}, /*              */ \
+/*L6x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		},
+
+#endif
