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104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
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* Copyright (C) 2015 Hamburg University of Applied Sciences
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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_gnrc_sixlowpan_frag 6LoWPAN Fragmentation
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* @ingroup net_gnrc_sixlowpan
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* @brief 6LoWPAN Fragmentation headers and functionality
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* @see <a href="https://tools.ietf.org/html/rfc4944#section-5.3">
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* RFC 4944, section 5.3
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* </a>
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* @{
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*
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* @file
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* @brief 6LoWPAN Fragmentation definitions
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*
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* @author Martine Lenders <mlenders@inf.fu-berlin.de>
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* @author Peter Kietzmann <peter.kietzmann@haw-hamburg.de>
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*/
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#ifndef NET_GNRC_SIXLOWPAN_FRAG_H
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#define NET_GNRC_SIXLOWPAN_FRAG_H
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#include <inttypes.h>
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#include <stdbool.h>
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#include "byteorder.h"
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#include "kernel_types.h"
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#include "net/gnrc/pkt.h"
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#include "net/ieee802154.h"
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#include "net/sixlowpan.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 Message type for passing one 6LoWPAN fragment down the network stack
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*/
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#define GNRC_SIXLOWPAN_MSG_FRAG_SND (0x0225)
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/**
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* @brief An entry in the 6LoWPAN reassembly buffer.
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*
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* A recipient of a fragment SHALL use
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*
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* 1. the source address,
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* 2. the destination address,
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* 3. the datagram size (gnrc_pktsnip_t::size of rbuf_t::pkt), and
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* 4. the datagram tag
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*
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* to identify all fragments that belong to the given datagram.
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*
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* @see [RFC 4944, section 5.3](https://tools.ietf.org/html/rfc4944#section-5.3)
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*/
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typedef struct {
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/**
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* @brief The reassembled packet in the packet buffer
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*/
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gnrc_pktsnip_t *pkt;
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uint8_t src[IEEE802154_LONG_ADDRESS_LEN]; /**< source address */
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uint8_t dst[IEEE802154_LONG_ADDRESS_LEN]; /**< destination address */
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uint8_t src_len; /**< length of gnrc_sixlowpan_rbuf_t::src */
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uint8_t dst_len; /**< length of gnrc_sixlowpan_rbuf_t::dst */
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uint16_t tag; /**< the datagram's tag */
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} gnrc_sixlowpan_rbuf_t;
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/**
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* @brief Definition of 6LoWPAN fragmentation type.
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*/
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typedef struct {
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gnrc_pktsnip_t *pkt; /**< Pointer to the IPv6 packet to be fragmented */
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size_t datagram_size; /**< Length of just the IPv6 packet to be fragmented */
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uint16_t offset; /**< Offset of the Nth fragment from the beginning of the
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* payload datagram */
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kernel_pid_t pid; /**< PID of the interface */
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} gnrc_sixlowpan_msg_frag_t;
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/**
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* @brief Sends a packet fragmented.
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*
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* @param[in] fragment_msg Message containing status of the 6LoWPAN
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* fragmentation progress
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*/
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void gnrc_sixlowpan_frag_send(gnrc_sixlowpan_msg_frag_t *fragment_msg);
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/**
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* @brief Handles a packet containing a fragment header.
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*
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* @param[in] pkt The packet to handle.
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*/
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void gnrc_sixlowpan_frag_handle_pkt(gnrc_pktsnip_t *pkt);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NET_GNRC_SIXLOWPAN_FRAG_H */
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/** @} */
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