| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * ppp_defs.h - PPP definitions. |
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| 4 | * |
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| 5 | * Copyright 1994-2000 Paul Mackerras. |
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| 6 | */ |
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| 7 | #ifndef _PPP_DEFS_H_ |
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| 8 | #define _PPP_DEFS_H_ |
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| 9 | |
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| 10 | #include <linux/crc-ccitt.h> |
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| 11 | #include <uapi/linux/ppp_defs.h> |
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| 12 | |
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| 13 | #define PPP_FCS(fcs, c) crc_ccitt_byte(fcs, c) |
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| 14 | |
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| 15 | /** |
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| 16 | * ppp_proto_is_valid - checks if PPP protocol is valid |
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| 17 | * @proto: PPP protocol |
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| 18 | * |
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| 19 | * Assumes proto is not compressed. |
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| 20 | * Protocol is valid if the value is odd and the least significant bit of the |
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| 21 | * most significant octet is 0 (see RFC 1661, section 2). |
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| 22 | */ |
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| 23 | static inline bool ppp_proto_is_valid(u16 proto) |
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| 24 | { |
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| 25 | return !!((proto & 0x0101) == 0x0001); |
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| 26 | } |
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| 27 | |
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| 28 | #endif /* _PPP_DEFS_H_ */ |
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| 29 | |
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