77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*
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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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/**
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* @file
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* @brief 802.15.4 6LoWPAN fragment handler
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*
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* This is not to be included by the application.
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*/
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#ifndef __NET_IEEE802154_6LO_FRAGMENT_H__
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#define __NET_IEEE802154_6LO_FRAGMENT_H__
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#include "ieee802154_6lo.h"
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#include "ieee802154_frame.h"
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#include <zephyr/net/net_pkt.h>
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#include <zephyr/sys/slist.h>
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#include <zephyr/types.h>
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static inline bool ieee802154_6lo_requires_fragmentation(struct net_pkt *pkt, uint8_t ll_hdr_len,
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uint8_t authtag_len)
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{
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return (ll_hdr_len + net_pkt_get_len(pkt) + authtag_len > IEEE802154_MTU);
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}
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static inline void ieee802154_6lo_fragment_ctx_init(struct ieee802154_6lo_fragment_ctx *ctx,
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struct net_pkt *pkt, uint16_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 ctx Pointer to valid fragmentation context
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* @param frame_buf Pointer to valid buffer where to write the fragment
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* @param ipch bool true for IPHC compression, false for IPv6 dispatch header
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*
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* @return pointer to the next buffer to be processed or NULL if no more
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* buffers need processing
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*/
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struct net_buf *ieee802154_6lo_fragment(struct ieee802154_6lo_fragment_ctx *ctx,
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struct net_buf *frame_buf, bool iphc);
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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 pkt 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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enum net_verdict ieee802154_6lo_reassemble(struct net_pkt *pkt);
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#endif /* __NET_IEEE802154_6LO_FRAGMENT_H__ */
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