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100 lines
2.7 KiB
C
100 lines
2.7 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 RBUF_H
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#define 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 "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_SIZE (4U) /**< size of the reassembly buffer */
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#define RBUF_TIMEOUT (3U * US_PER_SEC) /**< timeout for reassembly in microseconds */
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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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* @internal
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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 Internal representation of the 6LoWPAN reassembly buffer.
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*
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* Additional members help with correct reassembly of the buffer.
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*
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* @internal
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*
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* @extends gnrc_sixlowpan_rbuf_t
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*/
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typedef struct {
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gnrc_sixlowpan_rbuf_t super; /**< exposed part of the reassembly buffer */
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rbuf_int_t *ints; /**< intervals of the fragment */
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uint32_t arrival; /**< time in microseconds of arrival of
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* last received fragment */
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} rbuf_t;
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/**
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* @brief Adds a new fragment to the reassembly buffer. If the packet is
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* complete, dispatch the packet with the transmit information of
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* the last fragment.
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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] offset The fragment's offset.
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* @param[in] page Current 6Lo dispatch parsing page.
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*
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* @internal
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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 offset, unsigned page);
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/**
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* @brief Checks timeouts and removes entries if necessary
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*/
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void rbuf_gc(void);
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void rbuf_rm(rbuf_t *rbuf);
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#ifdef __cplusplus
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}
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#endif
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#endif /* RBUF_H */
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/** @} */
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