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2534cfb3fa
This allows for sending of fragments smaller than the restrictions set by the link-layer PDU. E.g. to put some slack for IPHC into the first fragment (see https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-02#section-4.1).
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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* Copyright (C) 2019 Freie Universität Berlin
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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_hint Fragment size hint
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* @ingroup net_gnrc_sixlowpan_frag
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* @brief Provides a hint for smaller fragment sizes than the link-layer
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* PDU for the next fragment to sent
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* @{
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*
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* @file
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* @brief Definitions to provide a hint on the final fragment size
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*
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* @author Martine Lenders <m.lenders@fu-berlin.de>
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*/
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#ifndef NET_GNRC_SIXLOWPAN_FRAG_HINT_H
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#define NET_GNRC_SIXLOWPAN_FRAG_HINT_H
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#include <stdint.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 A fragment size hint
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*/
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typedef struct {
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/**
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* @brief Provides a hint of the size for the next fragment to send
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*
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* Set to 0 for fitting to the maximum fragment size of the interface the
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* datagram is sent over.
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*
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* @see gnrc_netif_6lo_t::max_frag_size
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*/
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uint16_t fragsz;
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/**
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* @brief The size of the data bound by gnrc_sixlowpan_frag_hint_t::fragsz
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* uncompressed
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*
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* This is only evaluated when gnrc_sixlowpan_frag_hint_t::fragsz is greater
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* than 0.
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* Required to calculate the proper offset for the next fragment.
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*/
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uint16_t fragsz_uncomp;
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} gnrc_sixlowpan_frag_hint_t;
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#ifdef __cplusplus
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}
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#endif
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#endif /* NET_GNRC_SIXLOWPAN_FRAG_HINT_H */
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/** @} */
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