2022-04-02 13:17:33 +00:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* ppp_defs.h - PPP definitions.
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*
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* Copyright 1994-2000 Paul Mackerras.
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*/
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#ifndef _PPP_DEFS_H_
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#define _PPP_DEFS_H_
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#include <linux/crc-ccitt.h>
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#include <uapi/linux/ppp_defs.h>
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#define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c)
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2022-09-13 18:14:27 +00:00
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/**
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* ppp_proto_is_valid - checks if PPP protocol is valid
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* @proto: PPP protocol
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*
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* Assumes proto is not compressed.
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* Protocol is valid if the value is odd and the least significant bit of the
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* most significant octet is 0 (see RFC 1661, section 2).
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*/
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static inline bool ppp_proto_is_valid(u16 proto)
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{
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return !!((proto & 0x0101) == 0x0001);
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}
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2022-04-02 13:17:33 +00:00
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#endif /* _PPP_DEFS_H_ */
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