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102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
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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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* @ingroup net_gnrc_sixlowpan_frag
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* @{
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*
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* @file
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* @internal
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* @brief 6LoWPAN reassembly buffer
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*
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* @author Martine Lenders <mlenders@inf.fu-berlin.de>
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*/
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#ifndef GNRC_SIXLOWPAN_FRAG_RBUF_H_
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#define GNRC_SIXLOWPAN_FRAG_RBUF_H_
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#include <inttypes.h>
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#include "net/gnrc/netif/hdr.h"
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#include "net/gnrc/pkt.h"
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#include "timex.h"
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#include "net/gnrc/sixlowpan/frag.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RBUF_L2ADDR_MAX_LEN (8U) /**< maximum length for link-layer addresses */
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#define RBUF_SIZE (4U) /**< size of the reassembly buffer */
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#define RBUF_TIMEOUT (3U) /**< timeout for reassembly in seconds */
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/**
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* @brief Fragment intervals to identify limits of fragments.
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*
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* @note Fragments MUST NOT overlap and overlapping fragments are to be
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* discarded
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*
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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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typedef struct rbuf_int {
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struct rbuf_int *next; /**< next element in interval list */
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uint16_t start; /**< start byte of interval */
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uint16_t end; /**< end byte of interval */
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} rbuf_int_t;
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/**
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* @brief An entry in the 6LoWPAN reassembly buffer.
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*
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* @details A receipient 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 <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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typedef struct {
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rbuf_int_t *ints; /**< intervals of the fragment */
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gnrc_pktsnip_t *pkt; /**< the reassembled packet in packet buffer */
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uint32_t arrival; /**< time in seconds of arrival of last
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* received fragment */
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uint8_t src[RBUF_L2ADDR_MAX_LEN]; /**< source address */
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uint8_t dst[RBUF_L2ADDR_MAX_LEN]; /**< destination address */
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uint8_t src_len; /**< length of source address */
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uint8_t dst_len; /**< length of destination address */
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uint16_t tag; /**< the datagram's tag */
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uint16_t cur_size; /**< the datagram's current size */
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} rbuf_t;
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/**
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* @brief Adds a new fragment to the reassembly buffer.
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*
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* @param[in] netif_hdr The interface header of the fragment, with
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* gnrc_netif_hdr_t::if_pid and its source and
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* destination address set.
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* @param[in] frag The fragment to add.
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* @param[in] frag_size The fragment's size.
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* @param[in] offset The fragment's offset.
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*/
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void rbuf_add(gnrc_netif_hdr_t *netif_hdr, gnrc_pktsnip_t *frag,
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size_t frag_size, size_t offset);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GNRC_SIXLOWPAN_FRAG_RBUF_H_ */
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/** @} */
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