#ifndef _GTP_H_
#define _GTP_H

/* Resides in include/uapi/linux/udp.h */
#ifndef UDP_ENCAP_GTP0
#define UDP_ENCAP_GTP0	4
#endif

#ifndef UDP_ENCAP_GTP1U
#define UDP_ENCAP_GTP1U	5
#endif

/* general GTP protocol related definitions */

#define GTP0_PORT	3386
#define GTP1U_PORT	2152

#define GTP_TPDU	255

struct gtp0_header {	/* According to GSM TS 09.60 */
	__u8	flags;
	__u8	type;
	__be16	length;
	__be16	seq;
	__be16	flow;
	__u8	number;
	__u8	spare[3];
	__be64	tid;
} __attribute__ ((packed));

struct gtp1_header { /* According to 3GPP TS 29.060 */
	__u8	flags;
	__u8	type;
	__be16	length;
	__be32	tid;
} __attribute__ ((packed));

#define GTP1_F_NPDU	0x01
#define GTP1_F_SEQ	0x02
#define GTP1_F_EXTHDR	0x04
#define GTP1_F_MASK	0x07

#endif