| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file |
| * @brief 802.15.4 6LoWPAN fragment handler |
| * |
| * This is not to be included by the application. |
| */ |
| |
| #ifndef __NET_IEEE802154_6LO_FRAGMENT_H__ |
| #define __NET_IEEE802154_6LO_FRAGMENT_H__ |
| |
| #include "ieee802154_6lo.h" |
| #include "ieee802154_frame.h" |
| |
| #include <zephyr/net/net_pkt.h> |
| #include <zephyr/sys/slist.h> |
| #include <zephyr/types.h> |
| |
| static inline bool ieee802154_6lo_requires_fragmentation(struct net_pkt *pkt, uint8_t ll_hdr_size) |
| { |
| return (net_pkt_get_len(pkt) + ll_hdr_size > IEEE802154_MTU); |
| } |
| |
| static inline void ieee802154_6lo_fragment_ctx_init(struct ieee802154_6lo_fragment_ctx *ctx, |
| struct net_pkt *pkt, uint16_t hdr_diff, |
| bool iphc) |
| { |
| ctx->buf = pkt->buffer; |
| ctx->pos = ctx->buf->data; |
| ctx->hdr_diff = hdr_diff; |
| ctx->pkt_size = net_pkt_get_len(pkt) + (iphc ? hdr_diff : -1); |
| ctx->offset = 0U; |
| ctx->processed = 0U; |
| } |
| |
| /** |
| * @brief Fragment IPv6 packet as per RFC 6282 |
| * |
| * @details After IPv6 compression, transmission of IPv6 over 802.15.4 |
| * needs to be fragmented. Every fragment will have fragmentation header |
| * data size, data offset, data tag and payload. |
| * |
| * @param ctx Pointer to valid fragmentation context |
| * @param frame_buf Pointer to valid buffer where to write the fragment |
| * @param ipch bool true for IPHC compression, false for IPv6 dispatch header |
| * |
| * @return pointer to the next buffer to be processed or NULL if no more |
| * buffers need processing |
| */ |
| struct net_buf *ieee802154_6lo_fragment(struct ieee802154_6lo_fragment_ctx *ctx, |
| struct net_buf *frame_buf, bool iphc); |
| |
| /** |
| * @brief Reassemble 802.15.4 fragments as per RFC 6282 |
| * |
| * @details If the data does not fit into single fragment whole IPv6 packet |
| * comes in number of fragments. This function will reassemble them all as |
| * per data tag, data offset and data size. First packet is uncompressed |
| * immediately after reception. |
| * |
| * @param pkt Pointer to network fragment, which gets updated to full reassembled |
| * packet when verdict is NET_CONTINUE |
| * |
| * @return NET_CONTINUE reassembly done, pkt is complete |
| * NET_OK waiting for other fragments, |
| * NET_DROP invalid fragment. |
| */ |
| enum net_verdict ieee802154_6lo_reassemble(struct net_pkt *pkt); |
| |
| #endif /* __NET_IEEE802154_6LO_FRAGMENT_H__ */ |