| /** @file |
| @brief 802.15.4 fragment handler |
| |
| This is not to be included by the application. |
| */ |
| |
| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #ifndef __NET_IEEE802154_FRAGMENT_H__ |
| #define __NET_IEEE802154_FRAGMENT_H__ |
| |
| #include <sys/slist.h> |
| #include <zephyr/types.h> |
| |
| #include <net/net_pkt.h> |
| |
| #include "ieee802154_frame.h" |
| |
| struct ieee802154_fragment_ctx { |
| struct net_buf *buf; |
| uint8_t *pos; |
| uint16_t pkt_size; |
| uint16_t processed; |
| uint8_t hdr_diff; |
| uint8_t offset; |
| }; |
| |
| static inline bool ieee802154_fragment_is_needed(struct net_pkt *pkt, |
| uint8_t ll_hdr_size) |
| { |
| return (net_pkt_get_len(pkt) + ll_hdr_size > |
| IEEE802154_MTU - IEEE802154_MFR_LENGTH); |
| } |
| |
| static inline |
| void ieee802154_fragment_ctx_init(struct ieee802154_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 Pointer to valid fragmentation context |
| * @param Pointer to valid buffer where to write the fragment |
| * @param bool true for IPHC compression, false for IPv6 dispatch header |
| * |
| * @return True in case of success, false otherwise |
| */ |
| #ifdef CONFIG_NET_L2_IEEE802154_FRAGMENT |
| void ieee802154_fragment(struct ieee802154_fragment_ctx *ctx, |
| struct net_buf *frame_buf, bool iphc); |
| #else |
| #define ieee802154_fragment(...) |
| #endif |
| |
| /** |
| * @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 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. |
| */ |
| #ifdef CONFIG_NET_L2_IEEE802154_FRAGMENT |
| enum net_verdict ieee802154_reassemble(struct net_pkt *pkt); |
| #else |
| #define ieee802154_reassemble(...) |
| #endif /* CONFIG_NET_L2_IEEE802154_FRAGMENT */ |
| |
| #endif /* __NET_IEEE802154_FRAGMENT_H__ */ |