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68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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* Copyright (C) 2016 José Ignacio Alamos <jialamos@uc.cl>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup net_ppphdr Point-to-Point Protocol Header
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* @ingroup net_ppp
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* @brief PPP header abstraction type and helper functions
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* @{
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*
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* @file
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* @brief General definitions for PPP header and their helper functions
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*
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* @author José Ignacio Alamos
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*/
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#ifndef NET_PPP_HDR_H
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#define NET_PPP_HDR_H
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#include <inttypes.h>
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#include "byteorder.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Header of a PPP packet
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* @details A PPP packet is transmitted as a payload of an HDLC packet. PPP packets only carry information about control protocol
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* of a PPP stack (Link Control Protocol, IP Control Protocol, etc). IP packets encapsulated in HDLC frame are not
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* considered PPP packet.
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*
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* The format of PPP header plus payload is:
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*
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Code | Identifier | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Payload ...
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* +-+-+-+-+
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*
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*
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* @see <a href="https://tools.ietf.org/html/rfc1661#section-5">
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* RFC 1661, section 5
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* </a>
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*/
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/* PPP pkt header struct */
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typedef struct __attribute__((packed)){
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uint8_t code; /**< Code of PPP packet*/
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uint8_t id; /**< Identifier PPP of packet*/
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network_uint16_t length; /**< Length of PPP packet including payload*/
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} ppp_hdr_t;
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#ifdef __cplusplus
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}
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#endif
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#endif /* NET_PPP_HDR_H */
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/** @} */
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