| /* 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_ */ |