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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445/* 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 <linux/skbuff.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);}
/** * ppp_skb_is_compressed_proto - checks if PPP protocol in a skb is compressed * @skb: skb to check * * Check if the PPP protocol field is compressed (the least significant * bit of the most significant octet is 1). skb->data must point to the PPP * protocol header. * * Return: Whether the PPP protocol field is compressed. */static inline bool ppp_skb_is_compressed_proto(const struct sk_buff *skb){ return unlikely(skb->data[0] & 0x01);}
#endif /* _PPP_DEFS_H_ */