[linux-2.6-block.git] / include / linux / ppp_defs.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * ppp_defs.h - PPP definitions.
 *
 * Copyright 1994-2000 Paul Mackerras.
 */
#ifndef _PPP_DEFS_H_
#define _PPP_DEFS_H_

#include <linux/crc-ccitt.h>
#include <uapi/linux/ppp_defs.h>

#define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c)

/**
 * ppp_proto_is_valid - checks if PPP protocol is valid
 * @proto: PPP protocol
 *
 * Assumes proto is not compressed.
 * Protocol is valid if the value is odd and the least significant bit of the
 * most significant octet is 0 (see RFC 1661, section 2).
 */
static inline bool ppp_proto_is_valid(u16 proto)
{
	return !!((proto & 0x0101) == 0x0001);
}

#endif /* _PPP_DEFS_H_ */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
1da177e4 LT	2	/*
	3	* ppp_defs.h - PPP definitions.
	4	*
784db3f0	5	* Copyright 1994-2000 Paul Mackerras.
1da177e4	6	*/
1da177e4 LT	7	#ifndef _PPP_DEFS_H_
	8	#define _PPP_DEFS_H_
	9
2c88f4a8	10	#include <linux/crc-ccitt.h>
607ca46e	11	#include <uapi/linux/ppp_defs.h>
1da177e4	12
607ca46e	13	#define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c)
46126db9 WD	14
	15	/**
	16	* ppp_proto_is_valid - checks if PPP protocol is valid
	17	* @proto: PPP protocol
	18	*
	19	* Assumes proto is not compressed.
	20	* Protocol is valid if the value is odd and the least significant bit of the
	21	* most significant octet is 0 (see RFC 1661, section 2).
	22	*/
	23	static inline bool ppp_proto_is_valid(u16 proto)
	24	{
	25	return !!((proto & 0x0101) == 0x0001);
	26	}
	27
1da177e4	28	#endif /* _PPP_DEFS_H_ */