| /* 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_ */ |
