94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/** @file
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@brief 802.15.4 fragment handler
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This is not to be included by the application.
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*/
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/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __NET_IEEE802154_FRAGMENT_H__
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#define __NET_IEEE802154_FRAGMENT_H__
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#include <misc/slist.h>
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#include <zephyr/types.h>
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#include <net/net_pkt.h>
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#include "ieee802154_frame.h"
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struct ieee802154_fragment_ctx {
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struct net_buf *buf;
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u8_t *pos;
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u16_t pkt_size;
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u16_t processed;
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u8_t hdr_diff;
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u8_t offset;
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};
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static inline bool ieee802154_fragment_is_needed(struct net_pkt *pkt,
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u8_t ll_hdr_size)
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{
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return (net_pkt_get_len(pkt) + ll_hdr_size >
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IEEE802154_MTU - IEEE802154_MFR_LENGTH);
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}
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static inline
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void ieee802154_fragment_ctx_init(struct ieee802154_fragment_ctx *ctx,
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struct net_pkt *pkt, u16_t hdr_diff,
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bool iphc)
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{
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ctx->buf = pkt->buffer;
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ctx->pos = ctx->buf->data;
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ctx->hdr_diff = hdr_diff;
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ctx->pkt_size = net_pkt_get_len(pkt) + (iphc ? hdr_diff : -1);
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ctx->offset = 0U;
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ctx->processed = 0U;
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}
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/**
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* @brief Fragment IPv6 packet as per RFC 6282
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*
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* @details After IPv6 compression, transmission of IPv6 over 802.15.4
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* needs to be fragmented. Every fragment will have fragmentation header
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* data size, data offset, data tag and payload.
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*
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* @param Pointer to valid fragmentation context
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* @param Pointer to valid buffer where to write the fragment
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* @param bool true for IPHC compression, false for IPv6 dispatch header
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*
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* @return True in case of success, false otherwise
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*/
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#ifdef CONFIG_NET_L2_IEEE802154_FRAGMENT
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void ieee802154_fragment(struct ieee802154_fragment_ctx *ctx,
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struct net_buf *frame_buf, bool iphc);
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#else
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#define ieee802154_fragment(...)
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#endif
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/**
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* @brief Reassemble 802.15.4 fragments as per RFC 6282
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*
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* @details If the data does not fit into single fragment whole IPv6 packet
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* comes in number of fragments. This function will reassemble them all as
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* per data tag, data offset and data size. First packet is uncompressed
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* immediately after reception.
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*
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* @param Pointer to network fragment, which gets updated to full reassembled
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* packet when verdict is NET_CONTINUE
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*
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* @return NET_CONTINUE reassembly done, pkt is complete
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* NET_OK waiting for other fragments,
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* NET_DROP invalid fragment.
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*/
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#ifdef CONFIG_NET_L2_IEEE802154_FRAGMENT
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enum net_verdict ieee802154_reassemble(struct net_pkt *pkt);
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#else
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#define ieee802154_reassemble(...)
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#endif /* CONFIG_NET_L2_IEEE802154_FRAGMENT */
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#endif /* __NET_IEEE802154_FRAGMENT_H__ */
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