mirror of
https://github.com/lwip-tcpip/lwip.git
synced 2024-10-05 22:29:49 +00:00
Move common 6LoWPAN code to new file lopwan6_common.c
This is mainly IPHC (de)compression. TODO: adapt the 6LoWPAN-over-BLE netif to this. Signed-off-by: goldsimon <goldsimon@gmx.de>
This commit is contained in:
parent
c974fc9d43
commit
a4b9beef04
@ -2138,7 +2138,6 @@ PREDEFINED = __DOXYGEN__=1 \
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SO_REUSE_RXTOALL=1 \
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SO_REUSE_RXTOALL=1 \
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LWIP_HAVE_SLIPIF=1 \
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LWIP_HAVE_SLIPIF=1 \
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SLIP_RX_FROM_ISR=1 \
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SLIP_RX_FROM_ISR=1 \
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LWIP_6LOWPAN=1 \
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LWIP_TCP_PCB_NUM_EXT_ARGS=1
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LWIP_TCP_PCB_NUM_EXT_ARGS=1
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# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
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# If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
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@ -39,14 +39,6 @@
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#include "lwip/opt.h"
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#include "lwip/opt.h"
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/** Helper define for a MAC address, which can be encoded as 0, 2 or 8 bytes */
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struct ieee_802154_addr {
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/* encoded length of the address */
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u8_t addr_len;
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/* address bytes */
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u8_t addr[8];
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};
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#ifdef PACK_STRUCT_USE_INCLUDES
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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# include "arch/bpstruct.h"
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#endif
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#endif
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@ -44,8 +44,9 @@
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#include "netif/lowpan6_opts.h"
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#include "netif/lowpan6_opts.h"
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#if LWIP_IPV6 && LWIP_6LOWPAN /* don't build if not configured for use in lwipopts.h */
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#if LWIP_IPV6
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#include "netif/lowpan6_common.h"
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#include "lwip/pbuf.h"
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#include "lwip/pbuf.h"
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#include "lwip/ip.h"
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#include "lwip/ip.h"
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#include "lwip/ip_addr.h"
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#include "lwip/ip_addr.h"
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@ -83,6 +84,6 @@ err_t tcpip_6lowpan_input(struct pbuf *p, struct netif *inp);
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}
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}
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#endif
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#endif
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#endif /* LWIP_IPV6 && LWIP_6LOWPAN */
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#endif /* LWIP_IPV6 */
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#endif /* LWIP_HDR_LOWPAN6_H */
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#endif /* LWIP_HDR_LOWPAN6_H */
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82
src/include/netif/lowpan6_common.h
Normal file
82
src/include/netif/lowpan6_common.h
Normal file
@ -0,0 +1,82 @@
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/**
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* @file
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*
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* Common 6LowPAN routines for IPv6. Uses ND tables for link-layer addressing. Fragments packets to 6LowPAN units.
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*/
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/*
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* Copyright (c) 2015 Inico Technologies Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Ivan Delamer <delamer@inicotech.com>
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*
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*
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* Please coordinate changes and requests with Ivan Delamer
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* <delamer@inicotech.com>
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*/
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#ifndef LWIP_HDR_LOWPAN6_COMMON_H
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#define LWIP_HDR_LOWPAN6_COMMON_H
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#include "netif/lowpan6_opts.h"
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#if LWIP_IPV6 /* don't build if IPv6 is disabled in lwipopts.h */
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#include "lwip/pbuf.h"
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#include "lwip/ip.h"
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#include "lwip/ip6_addr.h"
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#include "lwip/netif.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Helper define for a link layer address, which can be encoded as 0, 2 or 8 bytes */
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struct lowpan6_link_addr {
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/* encoded length of the address */
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u8_t addr_len;
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/* address bytes */
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u8_t addr[8];
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};
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s8_t lowpan6_get_address_mode(const ip6_addr_t *ip6addr, const struct lowpan6_link_addr *mac_addr);
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#if LWIP_6LOWPAN_IPHC
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err_t lowpan6_compress_headers(struct netif *netif, u8_t *inbuf, size_t inbuf_size, u8_t *outbuf, size_t outbuf_size,
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u8_t *lowpan6_header_len_out, u8_t *hidden_header_len_out, ip6_addr_t *lowpan6_contexts,
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const struct lowpan6_link_addr *src, const struct lowpan6_link_addr *dst);
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struct pbuf *lowpan6_decompress(struct pbuf *p, u16_t datagram_size, ip6_addr_t *lowpan6_contexts,
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struct lowpan6_link_addr *src, struct lowpan6_link_addr *dest);
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#endif /* LWIP_6LOWPAN_IPHC */
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#ifdef __cplusplus
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}
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#endif
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#endif /* LWIP_IPV6 */
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#endif /* LWIP_HDR_LOWPAN6_COMMON_H */
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@ -43,32 +43,51 @@
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#include "lwip/opt.h"
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#include "lwip/opt.h"
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#ifndef LWIP_6LOWPAN
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/** LWIP_6LOWPAN_NUM_CONTEXTS: define the number of compression
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#define LWIP_6LOWPAN 0
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* contexts per netif type
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#endif
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*/
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#ifndef LWIP_6LOWPAN_NUM_CONTEXTS
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#ifndef LWIP_6LOWPAN_NUM_CONTEXTS
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#define LWIP_6LOWPAN_NUM_CONTEXTS 10
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#define LWIP_6LOWPAN_NUM_CONTEXTS 10
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#endif
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#endif
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/** LWIP_6LOWPAN_INFER_SHORT_ADDRESS: set this to 0 to disable creating
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* short addresses for matching addresses (debug only)
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*/
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#ifndef LWIP_6LOWPAN_INFER_SHORT_ADDRESS
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#ifndef LWIP_6LOWPAN_INFER_SHORT_ADDRESS
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#define LWIP_6LOWPAN_INFER_SHORT_ADDRESS 1
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#define LWIP_6LOWPAN_INFER_SHORT_ADDRESS 1
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#endif
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#endif
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/** LWIP_6LOWPAN_IPHC: set this to 0 to disable IP header compression as per
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* RFC 6282 (which is mandatory for BLE)
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*/
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#ifndef LWIP_6LOWPAN_IPHC
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#ifndef LWIP_6LOWPAN_IPHC
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#define LWIP_6LOWPAN_IPHC 1
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#define LWIP_6LOWPAN_IPHC 1
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#endif
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#endif
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#ifndef LWIP_6LOWPAN_HW_CRC
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/** Set this to 1 if your IEEE 802.15.4 interface can calculate and check the
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#define LWIP_6LOWPAN_HW_CRC 0
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* CRC in hardware. This means TX packets get 2 zero bytes added on transmission
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* which are to be filled with the CRC.
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*/
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#ifndef LWIP_6LOWPAN_802154_HW_CRC
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#define LWIP_6LOWPAN_802154_HW_CRC 0
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#endif
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#endif
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/** If LWIP_6LOWPAN_802154_HW_CRC==0, this can override the default slow
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* implementation of the CRC used for 6LoWPAN over IEEE 802.15.4 (which uses
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* a shift register).
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*/
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#ifndef LWIP_6LOWPAN_CALC_CRC
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#ifndef LWIP_6LOWPAN_CALC_CRC
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#define LWIP_6LOWPAN_CALC_CRC(buf, len) lowpan6_calc_crc(buf, len)
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#define LWIP_6LOWPAN_CALC_CRC(buf, len) lowpan6_calc_crc(buf, len)
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#endif
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#endif
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#ifndef LOWPAN6_DEBUG
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/** Debug level for 6LoWPAN in general */
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#define LOWPAN6_DEBUG LWIP_DBG_OFF
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#ifndef LWIP_LOWPAN6_DEBUG
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#define LWIP_LOWPAN6_DEBUG LWIP_DBG_OFF
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#endif
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/** Debug level for 6LoWPAN over IEEE 802.15.4 */
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#ifndef LWIP_LOWPAN6_802154_DEBUG
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#define LWIP_LOWPAN6_802154_DEBUG LWIP_DBG_OFF
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#endif
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#endif
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#endif /* LWIP_HDR_LOWPAN6_OPTS_H */
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#endif /* LWIP_HDR_LOWPAN6_OPTS_H */
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@ -43,7 +43,7 @@
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#include "lwip/opt.h"
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#include "lwip/opt.h"
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#include "netif/lowpan6.h"
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#include "netif/lowpan6.h"
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#if LWIP_IPV6 && LWIP_6LOWPAN /* don't build if not configured for use in lwipopts.h */
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#if LWIP_IPV6 /* don't build if not configured for use in lwipopts.h */
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#include "lwip/netif.h"
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#include "lwip/netif.h"
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@ -76,6 +76,6 @@ err_t zepif_init(struct netif *netif);
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}
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}
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#endif
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#endif
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#endif /* LWIP_IPV6 && LWIP_6LOWPAN */
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#endif /* LWIP_IPV6 */
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#endif /* LWIP_HDR_ZEPIF_H */
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#endif /* LWIP_HDR_ZEPIF_H */
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@ -50,7 +50,7 @@
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#include "netif/lowpan6.h"
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#include "netif/lowpan6.h"
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#if LWIP_IPV6 && LWIP_6LOWPAN
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#if LWIP_IPV6
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#include "lwip/ip.h"
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#include "lwip/ip.h"
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#include "lwip/pbuf.h"
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#include "lwip/pbuf.h"
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@ -65,7 +65,7 @@
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#include <string.h>
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#include <string.h>
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#if LWIP_6LOWPAN_HW_CRC
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#if LWIP_6LOWPAN_802154_HW_CRC
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#define LWIP_6LOWPAN_DO_CALC_CRC(buf, len) 0
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#define LWIP_6LOWPAN_DO_CALC_CRC(buf, len) 0
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#else
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#else
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#define LWIP_6LOWPAN_DO_CALC_CRC(buf, len) LWIP_6LOWPAN_CALC_CRC(buf, len)
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#define LWIP_6LOWPAN_DO_CALC_CRC(buf, len) LWIP_6LOWPAN_CALC_CRC(buf, len)
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@ -79,7 +79,7 @@ struct lowpan6_reass_helper {
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struct pbuf *reass;
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struct pbuf *reass;
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struct pbuf *frags;
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struct pbuf *frags;
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u8_t timer;
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u8_t timer;
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struct ieee_802154_addr sender_addr;
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struct lowpan6_link_addr sender_addr;
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u16_t datagram_size;
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u16_t datagram_size;
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u16_t datagram_tag;
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u16_t datagram_tag;
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};
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};
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@ -92,9 +92,11 @@ struct lowpan6_ieee802154_data {
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/** address context for compression */
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/** address context for compression */
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ip6_addr_t lowpan6_context[LWIP_6LOWPAN_NUM_CONTEXTS];
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ip6_addr_t lowpan6_context[LWIP_6LOWPAN_NUM_CONTEXTS];
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#endif
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#endif
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/** local PAN ID */
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/** Datagram Tag for fragmentation */
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u16_t ieee_802154_pan_id;
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u16_t tx_datagram_tag;
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u16_t tx_datagram_tag;
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/** local PAN ID for IEEE 802.15.4 header */
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u16_t ieee_802154_pan_id;
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/** Sequence Number for IEEE 802.15.4 transmission */
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u8_t tx_frame_seq_num;
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u8_t tx_frame_seq_num;
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};
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};
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@ -104,61 +106,19 @@ struct lowpan6_ieee802154_data {
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/** Currently, this state is global, since there's only one 6LoWPAN netif */
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/** Currently, this state is global, since there's only one 6LoWPAN netif */
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static struct lowpan6_ieee802154_data lowpan6_data;
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static struct lowpan6_ieee802154_data lowpan6_data;
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static const struct ieee_802154_addr ieee_802154_broadcast = {2, {0xff, 0xff}};
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#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
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#define LWIP_6LOWPAN_CONTEXTS(netif) lowpan6_data.lowpan6_context
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#else
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#define LWIP_6LOWPAN_CONTEXTS(netif) NULL
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#endif
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static const struct lowpan6_link_addr ieee_802154_broadcast = {2, {0xff, 0xff}};
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#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
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#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
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static struct ieee_802154_addr short_mac_addr = {2, {0, 0}};
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static struct lowpan6_link_addr short_mac_addr = {2, {0, 0}};
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#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
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#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
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static void
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/* IEEE 802.15.4 specific functions: */
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free_reass_datagram(struct lowpan6_reass_helper *lrh)
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{
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if (lrh->reass) {
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pbuf_free(lrh->reass);
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}
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if (lrh->frags) {
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pbuf_free(lrh->frags);
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}
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mem_free(lrh);
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}
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/**
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* Removes a datagram from the reassembly queue.
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**/
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static void
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dequeue_datagram(struct lowpan6_reass_helper *lrh, struct lowpan6_reass_helper *prev)
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{
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if (lowpan6_data.reass_list == lrh) {
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lowpan6_data.reass_list = lowpan6_data.reass_list->next_packet;
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} else {
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/* it wasn't the first, so it must have a valid 'prev' */
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LWIP_ASSERT("sanity check linked list", prev != NULL);
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prev->next_packet = lrh->next_packet;
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}
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}
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/**
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* Periodic timer for 6LowPAN functions:
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*
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* - Remove incomplete/old packets
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*/
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void
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lowpan6_tmr(void)
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{
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struct lowpan6_reass_helper *lrh, *lrh_next, *lrh_prev = NULL;
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lrh = lowpan6_data.reass_list;
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while (lrh != NULL) {
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lrh_next = lrh->next_packet;
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if ((--lrh->timer) == 0) {
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dequeue_datagram(lrh, lrh_prev);
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free_reass_datagram(lrh);
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} else {
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lrh_prev = lrh;
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}
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lrh = lrh_next;
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}
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}
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/** Write the IEEE 802.15.4 header that encapsulates the 6LoWPAN frame.
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/** Write the IEEE 802.15.4 header that encapsulates the 6LoWPAN frame.
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* Src and dst PAN IDs are filled with the ID set by @ref lowpan6_set_pan_id.
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* Src and dst PAN IDs are filled with the ID set by @ref lowpan6_set_pan_id.
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@ -167,8 +127,8 @@ lowpan6_tmr(void)
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* @returns the header length
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* @returns the header length
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*/
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*/
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static u8_t
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static u8_t
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lowpan6_write_iee802154_header(struct ieee_802154_hdr *hdr, const struct ieee_802154_addr *src,
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lowpan6_write_iee802154_header(struct ieee_802154_hdr *hdr, const struct lowpan6_link_addr *src,
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const struct ieee_802154_addr *dst)
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const struct lowpan6_link_addr *dst)
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{
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{
|
||||||
u8_t ieee_header_len;
|
u8_t ieee_header_len;
|
||||||
u8_t *buffer;
|
u8_t *buffer;
|
||||||
@ -223,8 +183,8 @@ lowpan6_write_iee802154_header(struct ieee_802154_hdr *hdr, const struct ieee_80
|
|||||||
* @returns ERR_OK if successful
|
* @returns ERR_OK if successful
|
||||||
*/
|
*/
|
||||||
static err_t
|
static err_t
|
||||||
lowpan6_parse_iee802154_header(struct pbuf *p, struct ieee_802154_addr *src,
|
lowpan6_parse_iee802154_header(struct pbuf *p, struct lowpan6_link_addr *src,
|
||||||
struct ieee_802154_addr *dest)
|
struct lowpan6_link_addr *dest)
|
||||||
{
|
{
|
||||||
u8_t *puc;
|
u8_t *puc;
|
||||||
s8_t i;
|
s8_t i;
|
||||||
@ -322,72 +282,57 @@ lowpan6_calc_crc(const void* buf, u16_t len)
|
|||||||
return crc;
|
return crc;
|
||||||
}
|
}
|
||||||
|
|
||||||
#if LWIP_6LOWPAN_IPHC && LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
/* Fragmentation specific functions: */
|
||||||
static s8_t
|
|
||||||
lowpan6_context_lookup(const ip6_addr_t *ip6addr)
|
static void
|
||||||
|
free_reass_datagram(struct lowpan6_reass_helper *lrh)
|
||||||
{
|
{
|
||||||
s8_t i;
|
if (lrh->reass) {
|
||||||
|
pbuf_free(lrh->reass);
|
||||||
for (i = 0; i < LWIP_6LOWPAN_NUM_CONTEXTS; i++) {
|
|
||||||
if (ip6_addr_netcmp(&lowpan6_data.lowpan6_context[i], ip6addr)) {
|
|
||||||
return i;
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
return -1;
|
if (lrh->frags) {
|
||||||
|
pbuf_free(lrh->frags);
|
||||||
|
}
|
||||||
|
mem_free(lrh);
|
||||||
}
|
}
|
||||||
#endif /* LWIP_6LOWPAN_IPHC && LWIP_6LOWPAN_NUM_CONTEXTS > 0 */
|
|
||||||
|
|
||||||
#if LWIP_6LOWPAN_IPHC || LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
/**
|
||||||
/* Determine compression mode for unicast address. */
|
* Removes a datagram from the reassembly queue.
|
||||||
static s8_t
|
**/
|
||||||
lowpan6_get_address_mode(const ip6_addr_t *ip6addr, const struct ieee_802154_addr *mac_addr)
|
static void
|
||||||
|
dequeue_datagram(struct lowpan6_reass_helper *lrh, struct lowpan6_reass_helper *prev)
|
||||||
{
|
{
|
||||||
if (mac_addr->addr_len == 2) {
|
if (lowpan6_data.reass_list == lrh) {
|
||||||
if ((ip6addr->addr[2] == (u32_t)PP_HTONL(0x000000ff)) &&
|
lowpan6_data.reass_list = lowpan6_data.reass_list->next_packet;
|
||||||
((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000))) {
|
} else {
|
||||||
if ((ip6addr->addr[3] & PP_HTONL(0x0000ffff)) == lwip_ntohl((mac_addr->addr[0] << 8) | mac_addr->addr[1])) {
|
/* it wasn't the first, so it must have a valid 'prev' */
|
||||||
return 3;
|
LWIP_ASSERT("sanity check linked list", prev != NULL);
|
||||||
}
|
prev->next_packet = lrh->next_packet;
|
||||||
}
|
|
||||||
} else if (mac_addr->addr_len == 8) {
|
|
||||||
if ((ip6addr->addr[2] == lwip_ntohl(((mac_addr->addr[0] ^ 2) << 24) | (mac_addr->addr[1] << 16) | mac_addr->addr[2] << 8 | mac_addr->addr[3])) &&
|
|
||||||
(ip6addr->addr[3] == lwip_ntohl((mac_addr->addr[4] << 24) | (mac_addr->addr[5] << 16) | mac_addr->addr[6] << 8 | mac_addr->addr[7]))) {
|
|
||||||
return 3;
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
|
|
||||||
if ((ip6addr->addr[2] == PP_HTONL(0x000000ffUL)) &&
|
|
||||||
((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000UL))) {
|
|
||||||
return 2;
|
|
||||||
}
|
|
||||||
|
|
||||||
return 1;
|
|
||||||
}
|
}
|
||||||
#endif /* LWIP_6LOWPAN_IPHC || LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
|
|
||||||
|
|
||||||
#if LWIP_6LOWPAN_IPHC
|
/**
|
||||||
/* Determine compression mode for multicast address. */
|
* Periodic timer for 6LowPAN functions:
|
||||||
static s8_t
|
*
|
||||||
lowpan6_get_address_mode_mc(const ip6_addr_t *ip6addr)
|
* - Remove incomplete/old packets
|
||||||
|
*/
|
||||||
|
void
|
||||||
|
lowpan6_tmr(void)
|
||||||
{
|
{
|
||||||
if ((ip6addr->addr[0] == PP_HTONL(0xff020000)) &&
|
struct lowpan6_reass_helper *lrh, *lrh_next, *lrh_prev = NULL;
|
||||||
(ip6addr->addr[1] == 0) &&
|
|
||||||
(ip6addr->addr[2] == 0) &&
|
|
||||||
((ip6addr->addr[3] & PP_HTONL(0xffffff00)) == 0)) {
|
|
||||||
return 3;
|
|
||||||
} else if (((ip6addr->addr[0] & PP_HTONL(0xff00ffff)) == PP_HTONL(0xff000000)) &&
|
|
||||||
(ip6addr->addr[1] == 0)) {
|
|
||||||
if ((ip6addr->addr[2] == 0) &&
|
|
||||||
((ip6addr->addr[3] & PP_HTONL(0xff000000)) == 0)) {
|
|
||||||
return 2;
|
|
||||||
} else if ((ip6addr->addr[2] & PP_HTONL(0xffffff00)) == 0) {
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
return 0;
|
lrh = lowpan6_data.reass_list;
|
||||||
|
while (lrh != NULL) {
|
||||||
|
lrh_next = lrh->next_packet;
|
||||||
|
if ((--lrh->timer) == 0) {
|
||||||
|
dequeue_datagram(lrh, lrh_prev);
|
||||||
|
free_reass_datagram(lrh);
|
||||||
|
} else {
|
||||||
|
lrh_prev = lrh;
|
||||||
|
}
|
||||||
|
lrh = lrh_next;
|
||||||
|
}
|
||||||
}
|
}
|
||||||
#endif /* LWIP_6LOWPAN_IPHC */
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Encapsulates data into IEEE 802.15.4 frames.
|
* Encapsulates data into IEEE 802.15.4 frames.
|
||||||
@ -395,15 +340,14 @@ lowpan6_get_address_mode_mc(const ip6_addr_t *ip6addr)
|
|||||||
* If configured, will compress IPv6 and or UDP headers.
|
* If configured, will compress IPv6 and or UDP headers.
|
||||||
* */
|
* */
|
||||||
static err_t
|
static err_t
|
||||||
lowpan6_frag(struct netif *netif, struct pbuf *p, const struct ieee_802154_addr *src, const struct ieee_802154_addr *dst)
|
lowpan6_frag(struct netif *netif, struct pbuf *p, const struct lowpan6_link_addr *src, const struct lowpan6_link_addr *dst)
|
||||||
{
|
{
|
||||||
struct pbuf *p_frag;
|
struct pbuf *p_frag;
|
||||||
u16_t frag_len, remaining_len, max_data_len;
|
u16_t frag_len, remaining_len, max_data_len;
|
||||||
u8_t *buffer;
|
u8_t *buffer;
|
||||||
u8_t ieee_header_len;
|
u8_t ieee_header_len;
|
||||||
u8_t lowpan6_header_len;
|
u8_t lowpan6_header_len;
|
||||||
u8_t hidden_header_len = 0;
|
u8_t hidden_header_len;
|
||||||
s8_t i;
|
|
||||||
u16_t crc;
|
u16_t crc;
|
||||||
u16_t datagram_offset;
|
u16_t datagram_offset;
|
||||||
err_t err = ERR_IF;
|
err_t err = ERR_IF;
|
||||||
@ -421,209 +365,20 @@ lowpan6_frag(struct netif *netif, struct pbuf *p, const struct ieee_802154_addr
|
|||||||
/* Write IEEE 802.15.4 header. */
|
/* Write IEEE 802.15.4 header. */
|
||||||
buffer = (u8_t *)p_frag->payload;
|
buffer = (u8_t *)p_frag->payload;
|
||||||
ieee_header_len = lowpan6_write_iee802154_header((struct ieee_802154_hdr *)buffer, src, dst);
|
ieee_header_len = lowpan6_write_iee802154_header((struct ieee_802154_hdr *)buffer, src, dst);
|
||||||
|
LWIP_ASSERT("ieee_header_len < p_frag->len", ieee_header_len < p_frag->len);
|
||||||
|
|
||||||
#if LWIP_6LOWPAN_IPHC
|
#if LWIP_6LOWPAN_IPHC
|
||||||
/* Perform 6LowPAN IPv6 header compression according to RFC 6282 */
|
/* Perform 6LowPAN IPv6 header compression according to RFC 6282 */
|
||||||
{
|
/* do the header compression (this does NOT copy any non-compressed data) */
|
||||||
struct ip6_hdr *ip6hdr;
|
err = lowpan6_compress_headers(netif, (u8_t *)p->payload, p->len,
|
||||||
|
&buffer[ieee_header_len], p_frag->len - ieee_header_len, &lowpan6_header_len,
|
||||||
/* Point to ip6 header and align copies of src/dest addresses. */
|
&hidden_header_len, LWIP_6LOWPAN_CONTEXTS(netif), src, dst);
|
||||||
ip6hdr = (struct ip6_hdr *)p->payload;
|
if (err != ERR_OK) {
|
||||||
ip_addr_copy_from_ip6_packed(ip_data.current_iphdr_dest, ip6hdr->dest);
|
MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
|
||||||
ip6_addr_assign_zone(ip_2_ip6(&ip_data.current_iphdr_dest), IP6_UNKNOWN, netif);
|
pbuf_free(p_frag);
|
||||||
ip_addr_copy_from_ip6_packed(ip_data.current_iphdr_src, ip6hdr->src);
|
return err;
|
||||||
ip6_addr_assign_zone(ip_2_ip6(&ip_data.current_iphdr_src), IP6_UNKNOWN, netif);
|
|
||||||
|
|
||||||
/* Basic length of 6LowPAN header, set dispatch and clear fields. */
|
|
||||||
lowpan6_header_len = 2;
|
|
||||||
buffer[ieee_header_len] = 0x60;
|
|
||||||
buffer[ieee_header_len + 1] = 0;
|
|
||||||
|
|
||||||
/* Determine whether there will be a Context Identifier Extension byte or not.
|
|
||||||
* If so, set it already. */
|
|
||||||
#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
|
||||||
buffer[ieee_header_len + 2] = 0;
|
|
||||||
|
|
||||||
i = lowpan6_context_lookup(ip_2_ip6(&ip_data.current_iphdr_src));
|
|
||||||
if (i >= 0) {
|
|
||||||
/* Stateful source address compression. */
|
|
||||||
buffer[ieee_header_len + 1] |= 0x40;
|
|
||||||
buffer[ieee_header_len + 2] |= (i & 0x0f) << 4;
|
|
||||||
}
|
|
||||||
|
|
||||||
i = lowpan6_context_lookup(ip_2_ip6(&ip_data.current_iphdr_dest));
|
|
||||||
if (i >= 0) {
|
|
||||||
/* Stateful destination address compression. */
|
|
||||||
buffer[ieee_header_len + 1] |= 0x04;
|
|
||||||
buffer[ieee_header_len + 2] |= i & 0x0f;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (buffer[ieee_header_len + 2] != 0x00) {
|
|
||||||
/* Context identifier extension byte is appended. */
|
|
||||||
buffer[ieee_header_len + 1] |= 0x80;
|
|
||||||
lowpan6_header_len++;
|
|
||||||
}
|
|
||||||
#endif /* LWIP_6LOWPAN_NUM_CONTEXTS > 0 */
|
|
||||||
|
|
||||||
/* Determine TF field: Traffic Class, Flow Label */
|
|
||||||
if (IP6H_FL(ip6hdr) == 0) {
|
|
||||||
/* Flow label is elided. */
|
|
||||||
buffer[ieee_header_len] |= 0x10;
|
|
||||||
if (IP6H_TC(ip6hdr) == 0) {
|
|
||||||
/* Traffic class (ECN+DSCP) elided too. */
|
|
||||||
buffer[ieee_header_len] |= 0x08;
|
|
||||||
} else {
|
|
||||||
/* Traffic class (ECN+DSCP) appended. */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = IP6H_TC(ip6hdr);
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
if (((IP6H_TC(ip6hdr) & 0x3f) == 0)) {
|
|
||||||
/* DSCP portion of Traffic Class is elided, ECN and FL are appended (3 bytes) */
|
|
||||||
buffer[ieee_header_len] |= 0x08;
|
|
||||||
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len] = IP6H_TC(ip6hdr) & 0xc0;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] |= (IP6H_FL(ip6hdr) >> 16) & 0x0f;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
|
|
||||||
} else {
|
|
||||||
/* Traffic class and flow label are appended (4 bytes) */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = IP6H_TC(ip6hdr);
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 16) & 0x0f;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Compress NH?
|
|
||||||
* Only if UDP for now. @todo support other NH compression. */
|
|
||||||
if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
|
|
||||||
buffer[ieee_header_len] |= 0x04;
|
|
||||||
} else {
|
|
||||||
/* append nexth. */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = IP6H_NEXTH(ip6hdr);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Compress hop limit? */
|
|
||||||
if (IP6H_HOPLIM(ip6hdr) == 255) {
|
|
||||||
buffer[ieee_header_len] |= 0x03;
|
|
||||||
} else if (IP6H_HOPLIM(ip6hdr) == 64) {
|
|
||||||
buffer[ieee_header_len] |= 0x02;
|
|
||||||
} else if (IP6H_HOPLIM(ip6hdr) == 1) {
|
|
||||||
buffer[ieee_header_len] |= 0x01;
|
|
||||||
} else {
|
|
||||||
/* append hop limit */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = IP6H_HOPLIM(ip6hdr);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Compress source address */
|
|
||||||
if (((buffer[ieee_header_len + 1] & 0x40) != 0) ||
|
|
||||||
(ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_src)))) {
|
|
||||||
/* Context-based or link-local source address compression. */
|
|
||||||
i = lowpan6_get_address_mode(ip_2_ip6(&ip_data.current_iphdr_src), src);
|
|
||||||
buffer[ieee_header_len + 1] |= (i & 0x03) << 4;
|
|
||||||
if (i == 1) {
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 16, 8);
|
|
||||||
lowpan6_header_len += 8;
|
|
||||||
} else if (i == 2) {
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 22, 2);
|
|
||||||
lowpan6_header_len += 2;
|
|
||||||
}
|
|
||||||
} else if (ip6_addr_isany(ip_2_ip6(&ip_data.current_iphdr_src))) {
|
|
||||||
/* Special case: mark SAC and leave SAM=0 */
|
|
||||||
buffer[ieee_header_len + 1] |= 0x40;
|
|
||||||
} else {
|
|
||||||
/* Append full address. */
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 8, 16);
|
|
||||||
lowpan6_header_len += 16;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Compress destination address */
|
|
||||||
if (ip6_addr_ismulticast(ip_2_ip6(&ip_data.current_iphdr_dest))) {
|
|
||||||
/* @todo support stateful multicast address compression */
|
|
||||||
|
|
||||||
buffer[ieee_header_len + 1] |= 0x08;
|
|
||||||
|
|
||||||
i = lowpan6_get_address_mode_mc(ip_2_ip6(&ip_data.current_iphdr_dest));
|
|
||||||
buffer[ieee_header_len + 1] |= i & 0x03;
|
|
||||||
if (i == 0) {
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 24, 16);
|
|
||||||
lowpan6_header_len += 16;
|
|
||||||
} else if (i == 1) {
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[25];
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 35, 5);
|
|
||||||
lowpan6_header_len += 5;
|
|
||||||
} else if (i == 2) {
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[25];
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 37, 3);
|
|
||||||
lowpan6_header_len += 3;
|
|
||||||
} else if (i == 3) {
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[39];
|
|
||||||
}
|
|
||||||
} else if (((buffer[ieee_header_len + 1] & 0x04) != 0) ||
|
|
||||||
(ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_dest)))) {
|
|
||||||
/* Context-based or link-local destination address compression. */
|
|
||||||
i = lowpan6_get_address_mode(ip_2_ip6(&ip_data.current_iphdr_dest), dst);
|
|
||||||
buffer[ieee_header_len + 1] |= i & 0x03;
|
|
||||||
if (i == 1) {
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 32, 8);
|
|
||||||
lowpan6_header_len += 8;
|
|
||||||
} else if (i == 2) {
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 38, 2);
|
|
||||||
lowpan6_header_len += 2;
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
/* Append full address. */
|
|
||||||
MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t *)p->payload + 24, 16);
|
|
||||||
lowpan6_header_len += 16;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Move to payload. */
|
|
||||||
pbuf_remove_header(p, IP6_HLEN);
|
|
||||||
hidden_header_len += IP6_HLEN;
|
|
||||||
|
|
||||||
#if LWIP_UDP
|
|
||||||
/* Compress UDP header? */
|
|
||||||
if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
|
|
||||||
/* @todo support optional checksum compression */
|
|
||||||
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len] = 0xf0;
|
|
||||||
|
|
||||||
/* determine port compression mode. */
|
|
||||||
if ((((u8_t *)p->payload)[0] == 0xf0) && ((((u8_t *)p->payload)[1] & 0xf0) == 0xb0) &&
|
|
||||||
(((u8_t *)p->payload)[2] == 0xf0) && ((((u8_t *)p->payload)[3] & 0xf0) == 0xb0)) {
|
|
||||||
/* Compress source and dest ports. */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] |= 0x03;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((((u8_t *)p->payload)[1] & 0x0f) << 4) | (((u8_t *)p->payload)[3] & 0x0f);
|
|
||||||
} else if (((u8_t *)p->payload)[0] == 0xf0) {
|
|
||||||
/* Compress source port. */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] |= 0x02;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[1];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[2];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[3];
|
|
||||||
} else if (((u8_t *)p->payload)[2] == 0xf0) {
|
|
||||||
/* Compress dest port. */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] |= 0x01;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[0];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[1];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[3];
|
|
||||||
} else {
|
|
||||||
/* append full ports. */
|
|
||||||
lowpan6_header_len++;
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[0];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[1];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[2];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[3];
|
|
||||||
}
|
|
||||||
|
|
||||||
/* elide length and copy checksum */
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[6];
|
|
||||||
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[7];
|
|
||||||
|
|
||||||
pbuf_remove_header(p, UDP_HLEN);
|
|
||||||
hidden_header_len += UDP_HLEN;
|
|
||||||
}
|
|
||||||
#endif /* LWIP_UDP */
|
|
||||||
}
|
}
|
||||||
|
pbuf_remove_header(p, hidden_header_len);
|
||||||
|
|
||||||
#else /* LWIP_6LOWPAN_IPHC */
|
#else /* LWIP_6LOWPAN_IPHC */
|
||||||
/* Send uncompressed IPv6 header with appropriate dispatch byte. */
|
/* Send uncompressed IPv6 header with appropriate dispatch byte. */
|
||||||
@ -676,7 +431,7 @@ lowpan6_frag(struct netif *netif, struct pbuf *p, const struct ieee_802154_addr
|
|||||||
|
|
||||||
/* send the packet */
|
/* send the packet */
|
||||||
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
||||||
LWIP_DEBUGF(LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
LWIP_DEBUGF(LWIP_LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
||||||
err = netif->linkoutput(netif, p_frag);
|
err = netif->linkoutput(netif, p_frag);
|
||||||
|
|
||||||
while ((remaining_len > 0) && (err == ERR_OK)) {
|
while ((remaining_len > 0) && (err == ERR_OK)) {
|
||||||
@ -707,7 +462,7 @@ lowpan6_frag(struct netif *netif, struct pbuf *p, const struct ieee_802154_addr
|
|||||||
|
|
||||||
/* send the packet */
|
/* send the packet */
|
||||||
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
||||||
LWIP_DEBUGF(LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
LWIP_DEBUGF(LWIP_LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
||||||
err = netif->linkoutput(netif, p_frag);
|
err = netif->linkoutput(netif, p_frag);
|
||||||
}
|
}
|
||||||
} else {
|
} else {
|
||||||
@ -728,7 +483,7 @@ lowpan6_frag(struct netif *netif, struct pbuf *p, const struct ieee_802154_addr
|
|||||||
|
|
||||||
/* send the packet */
|
/* send the packet */
|
||||||
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
||||||
LWIP_DEBUGF(LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
LWIP_DEBUGF(LWIP_LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
||||||
err = netif->linkoutput(netif, p_frag);
|
err = netif->linkoutput(netif, p_frag);
|
||||||
}
|
}
|
||||||
|
|
||||||
@ -778,7 +533,7 @@ lowpan6_set_short_addr(u8_t addr_high, u8_t addr_low)
|
|||||||
|
|
||||||
/* Create IEEE 802.15.4 address from netif address */
|
/* Create IEEE 802.15.4 address from netif address */
|
||||||
static err_t
|
static err_t
|
||||||
lowpan6_hwaddr_to_addr(struct netif *netif, struct ieee_802154_addr *addr)
|
lowpan6_hwaddr_to_addr(struct netif *netif, struct lowpan6_link_addr *addr)
|
||||||
{
|
{
|
||||||
addr->addr_len = 8;
|
addr->addr_len = 8;
|
||||||
if (netif->hwaddr_len == 8) {
|
if (netif->hwaddr_len == 8) {
|
||||||
@ -812,7 +567,7 @@ lowpan6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
|
|||||||
{
|
{
|
||||||
err_t result;
|
err_t result;
|
||||||
const u8_t *hwaddr;
|
const u8_t *hwaddr;
|
||||||
struct ieee_802154_addr src, dest;
|
struct lowpan6_link_addr src, dest;
|
||||||
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
||||||
ip6_addr_t ip6_src;
|
ip6_addr_t ip6_src;
|
||||||
struct ip6_hdr *ip6_hdr;
|
struct ip6_hdr *ip6_hdr;
|
||||||
@ -850,7 +605,7 @@ lowpan6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
|
|||||||
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
||||||
if (src.addr_len == 2) {
|
if (src.addr_len == 2) {
|
||||||
/* If source address was compressable to short_mac_addr, and dest has same subnet and
|
/* If source address was compressable to short_mac_addr, and dest has same subnet and
|
||||||
* is also compressable to 2-bytes, assume we can infer dest as a short address too. */
|
* is also compressable to 2-bytes, assume we can infer dest as a short address too. */
|
||||||
dest.addr_len = 2;
|
dest.addr_len = 2;
|
||||||
dest.addr[0] = ((u8_t *)q->payload)[38];
|
dest.addr[0] = ((u8_t *)q->payload)[38];
|
||||||
dest.addr[1] = ((u8_t *)q->payload)[39];
|
dest.addr[1] = ((u8_t *)q->payload)[39];
|
||||||
@ -883,367 +638,6 @@ lowpan6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
|
|||||||
MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
|
MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
|
||||||
return lowpan6_frag(netif, q, &src, &dest);
|
return lowpan6_frag(netif, q, &src, &dest);
|
||||||
}
|
}
|
||||||
|
|
||||||
/** Decompress IPv6 and UDP headers compressed according to RFC 6282
|
|
||||||
*
|
|
||||||
* @param lowpan6_buffer compressed headers, first byte is the dispatch byte
|
|
||||||
* @param lowpan6_bufsize size of lowpan6_buffer (may include data after headers)
|
|
||||||
* @param decomp_buffer buffer where the decompressed headers are stored
|
|
||||||
* @param decomp_bufsize size of decomp_buffer
|
|
||||||
* @param hdr_size_comp returns the size of the compressed headers (skip to get to data)
|
|
||||||
* @param hdr_size_decomp returns the size of the decompressed headers (IPv6 + UDP)
|
|
||||||
* @param datagram_size datagram size from fragments or 0 if unfragmented
|
|
||||||
* @param compressed_size compressed datagram size (for unfragmented rx)
|
|
||||||
* @param src source address of the outer layer, used for address compression
|
|
||||||
* @param dest destination address of the outer layer, used for address compression
|
|
||||||
* @return ERR_OK if decompression succeeded, an error otherwise
|
|
||||||
*/
|
|
||||||
static err_t
|
|
||||||
lowpan6_decompress_hdr(u8_t *lowpan6_buffer, size_t lowpan6_bufsize,
|
|
||||||
u8_t *decomp_buffer, size_t decomp_bufsize,
|
|
||||||
u16_t *hdr_size_comp, u16_t *hdr_size_decomp,
|
|
||||||
u16_t datagram_size, u16_t compressed_size,
|
|
||||||
struct ieee_802154_addr *src, struct ieee_802154_addr *dest)
|
|
||||||
{
|
|
||||||
u16_t lowpan6_offset;
|
|
||||||
struct ip6_hdr *ip6hdr;
|
|
||||||
s8_t i;
|
|
||||||
u16_t ip6_offset = IP6_HLEN;
|
|
||||||
|
|
||||||
LWIP_ASSERT("lowpan6_buffer != NULL", lowpan6_buffer != NULL);
|
|
||||||
LWIP_ASSERT("decomp_buffer != NULL", decomp_buffer != NULL);
|
|
||||||
LWIP_ASSERT("src != NULL", src != NULL);
|
|
||||||
LWIP_ASSERT("dest != NULL", dest != NULL);
|
|
||||||
|
|
||||||
ip6hdr = (struct ip6_hdr *)decomp_buffer;
|
|
||||||
if (decomp_bufsize < IP6_HLEN) {
|
|
||||||
return ERR_MEM;
|
|
||||||
}
|
|
||||||
|
|
||||||
lowpan6_offset = 2;
|
|
||||||
if (lowpan6_buffer[1] & 0x80) {
|
|
||||||
lowpan6_offset++;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Set IPv6 version, traffic class and flow label. */
|
|
||||||
if ((lowpan6_buffer[0] & 0x18) == 0x00) {
|
|
||||||
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset], ((lowpan6_buffer[lowpan6_offset + 1] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset + 3]);
|
|
||||||
lowpan6_offset += 4;
|
|
||||||
} else if ((lowpan6_buffer[0] & 0x18) == 0x08) {
|
|
||||||
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset] & 0xc0, ((lowpan6_buffer[lowpan6_offset] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset + 2]);
|
|
||||||
lowpan6_offset += 3;
|
|
||||||
} else if ((lowpan6_buffer[0] & 0x18) == 0x10) {
|
|
||||||
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset], 0);
|
|
||||||
lowpan6_offset += 1;
|
|
||||||
} else if ((lowpan6_buffer[0] & 0x18) == 0x18) {
|
|
||||||
IP6H_VTCFL_SET(ip6hdr, 6, 0, 0);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Set Next Header */
|
|
||||||
if ((lowpan6_buffer[0] & 0x04) == 0x00) {
|
|
||||||
IP6H_NEXTH_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
|
|
||||||
} else {
|
|
||||||
/* We should fill this later with NHC decoding */
|
|
||||||
IP6H_NEXTH_SET(ip6hdr, 0);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Set Hop Limit */
|
|
||||||
if ((lowpan6_buffer[0] & 0x03) == 0x00) {
|
|
||||||
IP6H_HOPLIM_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
|
|
||||||
} else if ((lowpan6_buffer[0] & 0x03) == 0x01) {
|
|
||||||
IP6H_HOPLIM_SET(ip6hdr, 1);
|
|
||||||
} else if ((lowpan6_buffer[0] & 0x03) == 0x02) {
|
|
||||||
IP6H_HOPLIM_SET(ip6hdr, 64);
|
|
||||||
} else if ((lowpan6_buffer[0] & 0x03) == 0x03) {
|
|
||||||
IP6H_HOPLIM_SET(ip6hdr, 255);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Source address decoding. */
|
|
||||||
if ((lowpan6_buffer[1] & 0x40) == 0x00) {
|
|
||||||
/* Stateless compression */
|
|
||||||
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
|
|
||||||
/* copy full address */
|
|
||||||
MEMCPY(&ip6hdr->src.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
|
||||||
lowpan6_offset += 16;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x30) == 0x10) {
|
|
||||||
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
|
||||||
ip6hdr->src.addr[1] = 0;
|
|
||||||
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
|
||||||
lowpan6_offset += 8;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
|
|
||||||
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
|
||||||
ip6hdr->src.addr[1] = 0;
|
|
||||||
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
||||||
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) |
|
|
||||||
lowpan6_buffer[lowpan6_offset + 1]);
|
|
||||||
lowpan6_offset += 2;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
|
|
||||||
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
|
||||||
ip6hdr->src.addr[1] = 0;
|
|
||||||
if (src->addr_len == 2) {
|
|
||||||
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
||||||
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]);
|
|
||||||
} else {
|
|
||||||
ip6hdr->src.addr[2] = lwip_htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) |
|
|
||||||
(src->addr[2] << 8) | src->addr[3]);
|
|
||||||
ip6hdr->src.addr[3] = lwip_htonl((src->addr[4] << 24) | (src->addr[5] << 16) |
|
|
||||||
(src->addr[6] << 8) | src->addr[7]);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
/* Stateful compression */
|
|
||||||
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
|
|
||||||
/* ANY address */
|
|
||||||
ip6hdr->src.addr[0] = 0;
|
|
||||||
ip6hdr->src.addr[1] = 0;
|
|
||||||
ip6hdr->src.addr[2] = 0;
|
|
||||||
ip6hdr->src.addr[3] = 0;
|
|
||||||
} else {
|
|
||||||
/* Set prefix from context info */
|
|
||||||
if (lowpan6_buffer[1] & 0x80) {
|
|
||||||
i = (lowpan6_buffer[2] >> 4) & 0x0f;
|
|
||||||
} else {
|
|
||||||
i = 0;
|
|
||||||
}
|
|
||||||
if (i >= LWIP_6LOWPAN_NUM_CONTEXTS) {
|
|
||||||
/* Error */
|
|
||||||
return ERR_VAL;
|
|
||||||
}
|
|
||||||
#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
|
||||||
ip6hdr->src.addr[0] = lowpan6_data.lowpan6_context[i].addr[0];
|
|
||||||
ip6hdr->src.addr[1] = lowpan6_data.lowpan6_context[i].addr[1];
|
|
||||||
#endif
|
|
||||||
}
|
|
||||||
|
|
||||||
if ((lowpan6_buffer[1] & 0x30) == 0x10) {
|
|
||||||
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
|
||||||
lowpan6_offset += 8;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
|
|
||||||
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
||||||
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset + 1]);
|
|
||||||
lowpan6_offset += 2;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
|
|
||||||
if (src->addr_len == 2) {
|
|
||||||
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
||||||
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]);
|
|
||||||
} else {
|
|
||||||
ip6hdr->src.addr[2] = lwip_htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) | (src->addr[2] << 8) | src->addr[3]);
|
|
||||||
ip6hdr->src.addr[3] = lwip_htonl((src->addr[4] << 24) | (src->addr[5] << 16) | (src->addr[6] << 8) | src->addr[7]);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Destination address decoding. */
|
|
||||||
if (lowpan6_buffer[1] & 0x08) {
|
|
||||||
/* Multicast destination */
|
|
||||||
if (lowpan6_buffer[1] & 0x04) {
|
|
||||||
/* @todo support stateful multicast addressing */
|
|
||||||
return ERR_VAL;
|
|
||||||
}
|
|
||||||
|
|
||||||
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
|
|
||||||
/* copy full address */
|
|
||||||
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
|
||||||
lowpan6_offset += 16;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
|
|
||||||
ip6hdr->dest.addr[0] = lwip_htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++] << 16));
|
|
||||||
ip6hdr->dest.addr[1] = 0;
|
|
||||||
ip6hdr->dest.addr[2] = lwip_htonl(lowpan6_buffer[lowpan6_offset++]);
|
|
||||||
ip6hdr->dest.addr[3] = lwip_htonl((lowpan6_buffer[lowpan6_offset] << 24) | (lowpan6_buffer[lowpan6_offset + 1] << 16) | (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset + 3]);
|
|
||||||
lowpan6_offset += 4;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
|
|
||||||
ip6hdr->dest.addr[0] = lwip_htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++] << 16));
|
|
||||||
ip6hdr->dest.addr[1] = 0;
|
|
||||||
ip6hdr->dest.addr[2] = 0;
|
|
||||||
ip6hdr->dest.addr[3] = lwip_htonl((lowpan6_buffer[lowpan6_offset] << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset + 2]);
|
|
||||||
lowpan6_offset += 3;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
|
|
||||||
ip6hdr->dest.addr[0] = PP_HTONL(0xff020000UL);
|
|
||||||
ip6hdr->dest.addr[1] = 0;
|
|
||||||
ip6hdr->dest.addr[2] = 0;
|
|
||||||
ip6hdr->dest.addr[3] = lwip_htonl(lowpan6_buffer[lowpan6_offset++]);
|
|
||||||
}
|
|
||||||
|
|
||||||
} else {
|
|
||||||
if (lowpan6_buffer[1] & 0x04) {
|
|
||||||
/* Stateful destination compression */
|
|
||||||
/* Set prefix from context info */
|
|
||||||
if (lowpan6_buffer[1] & 0x80) {
|
|
||||||
i = lowpan6_buffer[2] & 0x0f;
|
|
||||||
} else {
|
|
||||||
i = 0;
|
|
||||||
}
|
|
||||||
if (i >= LWIP_6LOWPAN_NUM_CONTEXTS) {
|
|
||||||
/* Error */
|
|
||||||
return ERR_VAL;
|
|
||||||
}
|
|
||||||
#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
|
||||||
ip6hdr->dest.addr[0] = lowpan6_data.lowpan6_context[i].addr[0];
|
|
||||||
ip6hdr->dest.addr[1] = lowpan6_data.lowpan6_context[i].addr[1];
|
|
||||||
#endif
|
|
||||||
} else {
|
|
||||||
/* Link local address compression */
|
|
||||||
ip6hdr->dest.addr[0] = PP_HTONL(0xfe800000UL);
|
|
||||||
ip6hdr->dest.addr[1] = 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
|
|
||||||
/* copy full address */
|
|
||||||
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
|
||||||
lowpan6_offset += 16;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
|
|
||||||
MEMCPY(&ip6hdr->dest.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
|
||||||
lowpan6_offset += 8;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
|
|
||||||
ip6hdr->dest.addr[2] = PP_HTONL(0x000000ffUL);
|
|
||||||
ip6hdr->dest.addr[3] = lwip_htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset + 1]);
|
|
||||||
lowpan6_offset += 2;
|
|
||||||
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
|
|
||||||
if (dest->addr_len == 2) {
|
|
||||||
ip6hdr->dest.addr[2] = PP_HTONL(0x000000ffUL);
|
|
||||||
ip6hdr->dest.addr[3] = lwip_htonl(0xfe000000UL | (dest->addr[0] << 8) | dest->addr[1]);
|
|
||||||
} else {
|
|
||||||
ip6hdr->dest.addr[2] = lwip_htonl(((dest->addr[0] ^ 2) << 24) | (dest->addr[1] << 16) | dest->addr[2] << 8 | dest->addr[3]);
|
|
||||||
ip6hdr->dest.addr[3] = lwip_htonl((dest->addr[4] << 24) | (dest->addr[5] << 16) | dest->addr[6] << 8 | dest->addr[7]);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
/* Next Header Compression (NHC) decoding? */
|
|
||||||
if (lowpan6_buffer[0] & 0x04) {
|
|
||||||
#if LWIP_UDP
|
|
||||||
if ((lowpan6_buffer[lowpan6_offset] & 0xf8) == 0xf0) {
|
|
||||||
struct udp_hdr *udphdr;
|
|
||||||
|
|
||||||
/* UDP compression */
|
|
||||||
IP6H_NEXTH_SET(ip6hdr, IP6_NEXTH_UDP);
|
|
||||||
udphdr = (struct udp_hdr *)((u8_t *)decomp_buffer + ip6_offset);
|
|
||||||
if (decomp_bufsize < IP6_HLEN + UDP_HLEN) {
|
|
||||||
return ERR_MEM;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (lowpan6_buffer[lowpan6_offset] & 0x04) {
|
|
||||||
/* @todo support checksum decompress */
|
|
||||||
return ERR_VAL;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Decompress ports */
|
|
||||||
i = lowpan6_buffer[lowpan6_offset++] & 0x03;
|
|
||||||
if (i == 0) {
|
|
||||||
udphdr->src = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
|
||||||
udphdr->dest = lwip_htons(lowpan6_buffer[lowpan6_offset + 2] << 8 | lowpan6_buffer[lowpan6_offset + 3]);
|
|
||||||
lowpan6_offset += 4;
|
|
||||||
} else if (i == 0x01) {
|
|
||||||
udphdr->src = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
|
||||||
udphdr->dest = lwip_htons(0xf000 | lowpan6_buffer[lowpan6_offset + 2]);
|
|
||||||
lowpan6_offset += 3;
|
|
||||||
} else if (i == 0x02) {
|
|
||||||
udphdr->src = lwip_htons(0xf000 | lowpan6_buffer[lowpan6_offset]);
|
|
||||||
udphdr->dest = lwip_htons(lowpan6_buffer[lowpan6_offset + 1] << 8 | lowpan6_buffer[lowpan6_offset + 2]);
|
|
||||||
lowpan6_offset += 3;
|
|
||||||
} else if (i == 0x03) {
|
|
||||||
udphdr->src = lwip_htons(0xf0b0 | ((lowpan6_buffer[lowpan6_offset] >> 4) & 0x0f));
|
|
||||||
udphdr->dest = lwip_htons(0xf0b0 | (lowpan6_buffer[lowpan6_offset] & 0x0f));
|
|
||||||
lowpan6_offset += 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
udphdr->chksum = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
|
||||||
lowpan6_offset += 2;
|
|
||||||
ip6_offset += UDP_HLEN;
|
|
||||||
if (datagram_size == 0) {
|
|
||||||
datagram_size = compressed_size - lowpan6_offset + ip6_offset;
|
|
||||||
}
|
|
||||||
udphdr->len = lwip_htons(datagram_size - IP6_HLEN);
|
|
||||||
|
|
||||||
} else
|
|
||||||
#endif /* LWIP_UDP */
|
|
||||||
{
|
|
||||||
/* @todo support NHC other than UDP */
|
|
||||||
return ERR_VAL;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
if (datagram_size == 0) {
|
|
||||||
datagram_size = compressed_size - lowpan6_offset + ip6_offset;
|
|
||||||
}
|
|
||||||
/* Infer IPv6 payload length for header */
|
|
||||||
IP6H_PLEN_SET(ip6hdr, datagram_size - IP6_HLEN);
|
|
||||||
|
|
||||||
if (lowpan6_offset > lowpan6_bufsize) {
|
|
||||||
/* input buffer overflow */
|
|
||||||
return ERR_VAL;
|
|
||||||
}
|
|
||||||
if (hdr_size_comp) {
|
|
||||||
*hdr_size_comp = lowpan6_offset;
|
|
||||||
}
|
|
||||||
if (hdr_size_decomp) {
|
|
||||||
*hdr_size_decomp = ip6_offset;
|
|
||||||
}
|
|
||||||
|
|
||||||
return ERR_OK;
|
|
||||||
}
|
|
||||||
|
|
||||||
static struct pbuf *
|
|
||||||
lowpan6_decompress(struct pbuf *p, u16_t datagram_size, struct ieee_802154_addr *src, struct ieee_802154_addr *dest)
|
|
||||||
{
|
|
||||||
struct pbuf *q;
|
|
||||||
u16_t lowpan6_offset, ip6_offset;
|
|
||||||
err_t err;
|
|
||||||
|
|
||||||
#if LWIP_UDP
|
|
||||||
#define UDP_HLEN_ALLOC UDP_HLEN
|
|
||||||
#else
|
|
||||||
#define UDP_HLEN_ALLOC 0
|
|
||||||
#endif
|
|
||||||
|
|
||||||
/* Allocate a buffer for decompression. This buffer will be too big and will be
|
|
||||||
trimmed once the final size is known. */
|
|
||||||
q = pbuf_alloc(PBUF_IP, p->len + IP6_HLEN + UDP_HLEN_ALLOC, PBUF_POOL);
|
|
||||||
if (q == NULL) {
|
|
||||||
pbuf_free(p);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
if (q->len < IP6_HLEN + UDP_HLEN_ALLOC) {
|
|
||||||
/* The headers need to fit into the first pbuf */
|
|
||||||
pbuf_free(p);
|
|
||||||
pbuf_free(q);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Decompress the IPv6 (and possibly UDP) header(s) into the new pbuf */
|
|
||||||
err = lowpan6_decompress_hdr((u8_t *)p->payload, p->len, (u8_t *)q->payload, q->len,
|
|
||||||
&lowpan6_offset, &ip6_offset, datagram_size, p->tot_len, src, dest);
|
|
||||||
if (err != ERR_OK) {
|
|
||||||
pbuf_free(p);
|
|
||||||
pbuf_free(q);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Now we copy leftover contents from p to q, so we have all L2 and L3 headers
|
|
||||||
(and L4?) in a single pbuf: */
|
|
||||||
|
|
||||||
/* Hide the compressed headers in p */
|
|
||||||
pbuf_remove_header(p, lowpan6_offset);
|
|
||||||
/* Temporarily hide the headers in q... */
|
|
||||||
pbuf_remove_header(q, ip6_offset);
|
|
||||||
/* ... copy the rest of p into q... */
|
|
||||||
pbuf_copy(q, p);
|
|
||||||
/* ... and reveal the headers again... */
|
|
||||||
pbuf_add_header_force(q, ip6_offset);
|
|
||||||
/* ... trim the pbuf to its correct size... */
|
|
||||||
pbuf_realloc(q, ip6_offset + p->len);
|
|
||||||
/* ... and cat possibly remaining (data-only) pbufs */
|
|
||||||
if (p->next != NULL) {
|
|
||||||
pbuf_cat(q, p->next);
|
|
||||||
}
|
|
||||||
/* the original (first) pbuf can now be freed */
|
|
||||||
p->next = NULL;
|
|
||||||
pbuf_free(p);
|
|
||||||
|
|
||||||
/* all done */
|
|
||||||
return q;
|
|
||||||
}
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* @ingroup sixlowpan
|
* @ingroup sixlowpan
|
||||||
* NETIF input function: don't free the input pbuf when returning != ERR_OK!
|
* NETIF input function: don't free the input pbuf when returning != ERR_OK!
|
||||||
@ -1253,7 +647,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
|
|||||||
{
|
{
|
||||||
u8_t *puc, b;
|
u8_t *puc, b;
|
||||||
s8_t i;
|
s8_t i;
|
||||||
struct ieee_802154_addr src, dest;
|
struct lowpan6_link_addr src, dest;
|
||||||
u16_t datagram_size = 0;
|
u16_t datagram_size = 0;
|
||||||
u16_t datagram_offset, datagram_tag;
|
u16_t datagram_offset, datagram_tag;
|
||||||
struct lowpan6_reass_helper *lrh, *lrh_next, *lrh_prev = NULL;
|
struct lowpan6_reass_helper *lrh, *lrh_next, *lrh_prev = NULL;
|
||||||
@ -1327,7 +721,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
|
|||||||
pbuf_remove_header(p, 1); /* hide dispatch byte. */
|
pbuf_remove_header(p, 1); /* hide dispatch byte. */
|
||||||
lrh->reass = p;
|
lrh->reass = p;
|
||||||
} else if ((*(u8_t *)p->payload & 0xe0 ) == 0x60) {
|
} else if ((*(u8_t *)p->payload & 0xe0 ) == 0x60) {
|
||||||
lrh->reass = lowpan6_decompress(p, datagram_size, &src, &dest);
|
lrh->reass = lowpan6_decompress(p, datagram_size, LWIP_6LOWPAN_CONTEXTS(netif), &src, &dest);
|
||||||
if (lrh->reass == NULL) {
|
if (lrh->reass == NULL) {
|
||||||
/* decompression failed */
|
/* decompression failed */
|
||||||
mem_free(lrh);
|
mem_free(lrh);
|
||||||
@ -1453,7 +847,7 @@ lowpan6_input(struct pbuf *p, struct netif *netif)
|
|||||||
pbuf_remove_header(p, 1); /* hide dispatch byte. */
|
pbuf_remove_header(p, 1); /* hide dispatch byte. */
|
||||||
} else if ((b & 0xe0 ) == 0x60) {
|
} else if ((b & 0xe0 ) == 0x60) {
|
||||||
/* IPv6 headers are compressed using IPHC. */
|
/* IPv6 headers are compressed using IPHC. */
|
||||||
p = lowpan6_decompress(p, datagram_size, &src, &dest);
|
p = lowpan6_decompress(p, datagram_size, LWIP_6LOWPAN_CONTEXTS(netif), &src, &dest);
|
||||||
if (p == NULL) {
|
if (p == NULL) {
|
||||||
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
||||||
return ERR_OK;
|
return ERR_OK;
|
||||||
@ -1523,4 +917,4 @@ tcpip_6lowpan_input(struct pbuf *p, struct netif *inp)
|
|||||||
}
|
}
|
||||||
#endif /* !NO_SYS */
|
#endif /* !NO_SYS */
|
||||||
|
|
||||||
#endif /* LWIP_IPV6 && LWIP_6LOWPAN */
|
#endif /* LWIP_IPV6 */
|
||||||
|
739
src/netif/lowpan6_common.c
Normal file
739
src/netif/lowpan6_common.c
Normal file
@ -0,0 +1,739 @@
|
|||||||
|
/**
|
||||||
|
* @file
|
||||||
|
*
|
||||||
|
* Common 6LowPAN routines for IPv6. Uses ND tables for link-layer addressing. Fragments packets to 6LowPAN units.
|
||||||
|
*
|
||||||
|
* This implementation aims to conform to IEEE 802.15.4(-2015), RFC 4944 and RFC 6282.
|
||||||
|
* @todo: RFC 6775.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2015 Inico Technologies Ltd.
|
||||||
|
* All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without modification,
|
||||||
|
* are permitted provided that the following conditions are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright notice,
|
||||||
|
* this list of conditions and the following disclaimer.
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||||||
|
* this list of conditions and the following disclaimer in the documentation
|
||||||
|
* and/or other materials provided with the distribution.
|
||||||
|
* 3. The name of the author may not be used to endorse or promote products
|
||||||
|
* derived from this software without specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
||||||
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||||
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
||||||
|
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||||||
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
||||||
|
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||||
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||||
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
||||||
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
||||||
|
* OF SUCH DAMAGE.
|
||||||
|
*
|
||||||
|
* This file is part of the lwIP TCP/IP stack.
|
||||||
|
*
|
||||||
|
* Author: Ivan Delamer <delamer@inicotech.com>
|
||||||
|
*
|
||||||
|
*
|
||||||
|
* Please coordinate changes and requests with Ivan Delamer
|
||||||
|
* <delamer@inicotech.com>
|
||||||
|
*/
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @defgroup sixlowpan 6LoWPAN (RFC4944)
|
||||||
|
* @ingroup netifs
|
||||||
|
* 6LowPAN netif implementation
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include "netif/lowpan6_common.h"
|
||||||
|
|
||||||
|
#if LWIP_IPV6
|
||||||
|
|
||||||
|
#include "lwip/ip.h"
|
||||||
|
#include "lwip/pbuf.h"
|
||||||
|
#include "lwip/ip_addr.h"
|
||||||
|
#include "lwip/netif.h"
|
||||||
|
#include "lwip/udp.h"
|
||||||
|
|
||||||
|
#include <string.h>
|
||||||
|
|
||||||
|
/* Determine compression mode for unicast address. */
|
||||||
|
s8_t
|
||||||
|
lowpan6_get_address_mode(const ip6_addr_t *ip6addr, const struct lowpan6_link_addr *mac_addr)
|
||||||
|
{
|
||||||
|
if (mac_addr->addr_len == 2) {
|
||||||
|
if ((ip6addr->addr[2] == (u32_t)PP_HTONL(0x000000ff)) &&
|
||||||
|
((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000))) {
|
||||||
|
if ((ip6addr->addr[3] & PP_HTONL(0x0000ffff)) == lwip_ntohl((mac_addr->addr[0] << 8) | mac_addr->addr[1])) {
|
||||||
|
return 3;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
} else if (mac_addr->addr_len == 8) {
|
||||||
|
if ((ip6addr->addr[2] == lwip_ntohl(((mac_addr->addr[0] ^ 2) << 24) | (mac_addr->addr[1] << 16) | mac_addr->addr[2] << 8 | mac_addr->addr[3])) &&
|
||||||
|
(ip6addr->addr[3] == lwip_ntohl((mac_addr->addr[4] << 24) | (mac_addr->addr[5] << 16) | mac_addr->addr[6] << 8 | mac_addr->addr[7]))) {
|
||||||
|
return 3;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((ip6addr->addr[2] == PP_HTONL(0x000000ffUL)) &&
|
||||||
|
((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000UL))) {
|
||||||
|
return 2;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
#if LWIP_6LOWPAN_IPHC
|
||||||
|
|
||||||
|
/* Determine compression mode for multicast address. */
|
||||||
|
static s8_t
|
||||||
|
lowpan6_get_address_mode_mc(const ip6_addr_t *ip6addr)
|
||||||
|
{
|
||||||
|
if ((ip6addr->addr[0] == PP_HTONL(0xff020000)) &&
|
||||||
|
(ip6addr->addr[1] == 0) &&
|
||||||
|
(ip6addr->addr[2] == 0) &&
|
||||||
|
((ip6addr->addr[3] & PP_HTONL(0xffffff00)) == 0)) {
|
||||||
|
return 3;
|
||||||
|
} else if (((ip6addr->addr[0] & PP_HTONL(0xff00ffff)) == PP_HTONL(0xff000000)) &&
|
||||||
|
(ip6addr->addr[1] == 0)) {
|
||||||
|
if ((ip6addr->addr[2] == 0) &&
|
||||||
|
((ip6addr->addr[3] & PP_HTONL(0xff000000)) == 0)) {
|
||||||
|
return 2;
|
||||||
|
} else if ((ip6addr->addr[2] & PP_HTONL(0xffffff00)) == 0) {
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
||||||
|
static s8_t
|
||||||
|
lowpan6_context_lookup(const ip6_addr_t *lowpan6_contexts, const ip6_addr_t *ip6addr)
|
||||||
|
{
|
||||||
|
s8_t i;
|
||||||
|
|
||||||
|
for (i = 0; i < LWIP_6LOWPAN_NUM_CONTEXTS; i++) {
|
||||||
|
if (ip6_addr_netcmp(&lowpan6_contexts[i], ip6addr)) {
|
||||||
|
return i;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
#endif /* LWIP_6LOWPAN_NUM_CONTEXTS > 0 */
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Compress IPv6 and/or UDP headers.
|
||||||
|
* */
|
||||||
|
err_t
|
||||||
|
lowpan6_compress_headers(struct netif *netif, u8_t *inbuf, size_t inbuf_size, u8_t *outbuf, size_t outbuf_size,
|
||||||
|
u8_t *lowpan6_header_len_out, u8_t *hidden_header_len_out, ip6_addr_t *lowpan6_contexts,
|
||||||
|
const struct lowpan6_link_addr *src, const struct lowpan6_link_addr *dst)
|
||||||
|
{
|
||||||
|
u8_t *buffer, *inptr;
|
||||||
|
u8_t lowpan6_header_len;
|
||||||
|
u8_t hidden_header_len = 0;
|
||||||
|
s8_t i;
|
||||||
|
struct ip6_hdr *ip6hdr;
|
||||||
|
ip_addr_t ip6src, ip6dst;
|
||||||
|
|
||||||
|
LWIP_ASSERT("netif != NULL", netif != NULL);
|
||||||
|
LWIP_ASSERT("inbuf != NULL", inbuf != NULL);
|
||||||
|
LWIP_ASSERT("outbuf != NULL", outbuf != NULL);
|
||||||
|
LWIP_ASSERT("lowpan6_header_len_out != NULL", lowpan6_header_len_out != NULL);
|
||||||
|
LWIP_ASSERT("hidden_header_len_out != NULL", hidden_header_len_out != NULL);
|
||||||
|
|
||||||
|
/* Perform 6LowPAN IPv6 header compression according to RFC 6282 */
|
||||||
|
buffer = outbuf;
|
||||||
|
inptr = inbuf;
|
||||||
|
|
||||||
|
if (inbuf_size < IP6_HLEN) {
|
||||||
|
/* input buffer too short */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
if (outbuf_size < IP6_HLEN) {
|
||||||
|
/* output buffer too short for worst case */
|
||||||
|
return ERR_MEM;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Point to ip6 header and align copies of src/dest addresses. */
|
||||||
|
ip6hdr = (struct ip6_hdr *)inptr;
|
||||||
|
ip_addr_copy_from_ip6_packed(ip6dst, ip6hdr->dest);
|
||||||
|
ip6_addr_assign_zone(ip_2_ip6(&ip6dst), IP6_UNKNOWN, netif);
|
||||||
|
ip_addr_copy_from_ip6_packed(ip6src, ip6hdr->src);
|
||||||
|
ip6_addr_assign_zone(ip_2_ip6(&ip6src), IP6_UNKNOWN, netif);
|
||||||
|
|
||||||
|
/* Basic length of 6LowPAN header, set dispatch and clear fields. */
|
||||||
|
lowpan6_header_len = 2;
|
||||||
|
buffer[0] = 0x60;
|
||||||
|
buffer[1] = 0;
|
||||||
|
|
||||||
|
/* Determine whether there will be a Context Identifier Extension byte or not.
|
||||||
|
* If so, set it already. */
|
||||||
|
#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
||||||
|
buffer[2] = 0;
|
||||||
|
|
||||||
|
i = lowpan6_context_lookup(lowpan6_contexts, ip_2_ip6(&ip6src));
|
||||||
|
if (i >= 0) {
|
||||||
|
/* Stateful source address compression. */
|
||||||
|
buffer[1] |= 0x40;
|
||||||
|
buffer[2] |= (i & 0x0f) << 4;
|
||||||
|
}
|
||||||
|
|
||||||
|
i = lowpan6_context_lookup(lowpan6_contexts, ip_2_ip6(&ip6dst));
|
||||||
|
if (i >= 0) {
|
||||||
|
/* Stateful destination address compression. */
|
||||||
|
buffer[1] |= 0x04;
|
||||||
|
buffer[2] |= i & 0x0f;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (buffer[2] != 0x00) {
|
||||||
|
/* Context identifier extension byte is appended. */
|
||||||
|
buffer[1] |= 0x80;
|
||||||
|
lowpan6_header_len++;
|
||||||
|
}
|
||||||
|
#else /* LWIP_6LOWPAN_NUM_CONTEXTS > 0 */
|
||||||
|
LWIP_UNUSED_ARG(lowpan6_contexts);
|
||||||
|
#endif /* LWIP_6LOWPAN_NUM_CONTEXTS > 0 */
|
||||||
|
|
||||||
|
/* Determine TF field: Traffic Class, Flow Label */
|
||||||
|
if (IP6H_FL(ip6hdr) == 0) {
|
||||||
|
/* Flow label is elided. */
|
||||||
|
buffer[0] |= 0x10;
|
||||||
|
if (IP6H_TC(ip6hdr) == 0) {
|
||||||
|
/* Traffic class (ECN+DSCP) elided too. */
|
||||||
|
buffer[0] |= 0x08;
|
||||||
|
} else {
|
||||||
|
/* Traffic class (ECN+DSCP) appended. */
|
||||||
|
buffer[lowpan6_header_len++] = IP6H_TC(ip6hdr);
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
if (((IP6H_TC(ip6hdr) & 0x3f) == 0)) {
|
||||||
|
/* DSCP portion of Traffic Class is elided, ECN and FL are appended (3 bytes) */
|
||||||
|
buffer[0] |= 0x08;
|
||||||
|
|
||||||
|
buffer[lowpan6_header_len] = IP6H_TC(ip6hdr) & 0xc0;
|
||||||
|
buffer[lowpan6_header_len++] |= (IP6H_FL(ip6hdr) >> 16) & 0x0f;
|
||||||
|
buffer[lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
|
||||||
|
buffer[lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
|
||||||
|
} else {
|
||||||
|
/* Traffic class and flow label are appended (4 bytes) */
|
||||||
|
buffer[lowpan6_header_len++] = IP6H_TC(ip6hdr);
|
||||||
|
buffer[lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 16) & 0x0f;
|
||||||
|
buffer[lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
|
||||||
|
buffer[lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Compress NH?
|
||||||
|
* Only if UDP for now. @todo support other NH compression. */
|
||||||
|
if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
|
||||||
|
buffer[0] |= 0x04;
|
||||||
|
} else {
|
||||||
|
/* append nexth. */
|
||||||
|
buffer[lowpan6_header_len++] = IP6H_NEXTH(ip6hdr);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Compress hop limit? */
|
||||||
|
if (IP6H_HOPLIM(ip6hdr) == 255) {
|
||||||
|
buffer[0] |= 0x03;
|
||||||
|
} else if (IP6H_HOPLIM(ip6hdr) == 64) {
|
||||||
|
buffer[0] |= 0x02;
|
||||||
|
} else if (IP6H_HOPLIM(ip6hdr) == 1) {
|
||||||
|
buffer[0] |= 0x01;
|
||||||
|
} else {
|
||||||
|
/* append hop limit */
|
||||||
|
buffer[lowpan6_header_len++] = IP6H_HOPLIM(ip6hdr);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Compress source address */
|
||||||
|
if (((buffer[1] & 0x40) != 0) ||
|
||||||
|
(ip6_addr_islinklocal(ip_2_ip6(&ip6src)))) {
|
||||||
|
/* Context-based or link-local source address compression. */
|
||||||
|
i = lowpan6_get_address_mode(ip_2_ip6(&ip6src), src);
|
||||||
|
buffer[1] |= (i & 0x03) << 4;
|
||||||
|
if (i == 1) {
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 16, 8);
|
||||||
|
lowpan6_header_len += 8;
|
||||||
|
} else if (i == 2) {
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 22, 2);
|
||||||
|
lowpan6_header_len += 2;
|
||||||
|
}
|
||||||
|
} else if (ip6_addr_isany(ip_2_ip6(&ip6src))) {
|
||||||
|
/* Special case: mark SAC and leave SAM=0 */
|
||||||
|
buffer[1] |= 0x40;
|
||||||
|
} else {
|
||||||
|
/* Append full address. */
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 8, 16);
|
||||||
|
lowpan6_header_len += 16;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Compress destination address */
|
||||||
|
if (ip6_addr_ismulticast(ip_2_ip6(&ip6dst))) {
|
||||||
|
/* @todo support stateful multicast address compression */
|
||||||
|
|
||||||
|
buffer[1] |= 0x08;
|
||||||
|
|
||||||
|
i = lowpan6_get_address_mode_mc(ip_2_ip6(&ip6dst));
|
||||||
|
buffer[1] |= i & 0x03;
|
||||||
|
if (i == 0) {
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 24, 16);
|
||||||
|
lowpan6_header_len += 16;
|
||||||
|
} else if (i == 1) {
|
||||||
|
buffer[lowpan6_header_len++] = inptr[25];
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 35, 5);
|
||||||
|
lowpan6_header_len += 5;
|
||||||
|
} else if (i == 2) {
|
||||||
|
buffer[lowpan6_header_len++] = inptr[25];
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 37, 3);
|
||||||
|
lowpan6_header_len += 3;
|
||||||
|
} else if (i == 3) {
|
||||||
|
buffer[lowpan6_header_len++] = (inptr)[39];
|
||||||
|
}
|
||||||
|
} else if (((buffer[1] & 0x04) != 0) ||
|
||||||
|
(ip6_addr_islinklocal(ip_2_ip6(&ip6dst)))) {
|
||||||
|
/* Context-based or link-local destination address compression. */
|
||||||
|
i = lowpan6_get_address_mode(ip_2_ip6(&ip6dst), dst);
|
||||||
|
buffer[1] |= i & 0x03;
|
||||||
|
if (i == 1) {
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 32, 8);
|
||||||
|
lowpan6_header_len += 8;
|
||||||
|
} else if (i == 2) {
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 38, 2);
|
||||||
|
lowpan6_header_len += 2;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
/* Append full address. */
|
||||||
|
MEMCPY(buffer + lowpan6_header_len, inptr + 24, 16);
|
||||||
|
lowpan6_header_len += 16;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Move to payload. */
|
||||||
|
inptr += IP6_HLEN;
|
||||||
|
hidden_header_len += IP6_HLEN;
|
||||||
|
|
||||||
|
#if LWIP_UDP
|
||||||
|
/* Compress UDP header? */
|
||||||
|
if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
|
||||||
|
/* @todo support optional checksum compression */
|
||||||
|
|
||||||
|
if (inbuf_size < IP6_HLEN + UDP_HLEN) {
|
||||||
|
/* input buffer too short */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
if (outbuf_size < (size_t)(hidden_header_len + 7)) {
|
||||||
|
/* output buffer too short for worst case */
|
||||||
|
return ERR_MEM;
|
||||||
|
}
|
||||||
|
|
||||||
|
buffer[lowpan6_header_len] = 0xf0;
|
||||||
|
|
||||||
|
/* determine port compression mode. */
|
||||||
|
if ((inptr[0] == 0xf0) && ((inptr[1] & 0xf0) == 0xb0) &&
|
||||||
|
(inptr[2] == 0xf0) && ((inptr[3] & 0xf0) == 0xb0)) {
|
||||||
|
/* Compress source and dest ports. */
|
||||||
|
buffer[lowpan6_header_len++] |= 0x03;
|
||||||
|
buffer[lowpan6_header_len++] = ((inptr[1] & 0x0f) << 4) | (inptr[3] & 0x0f);
|
||||||
|
} else if (inptr[0] == 0xf0) {
|
||||||
|
/* Compress source port. */
|
||||||
|
buffer[lowpan6_header_len++] |= 0x02;
|
||||||
|
buffer[lowpan6_header_len++] = inptr[1];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[2];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[3];
|
||||||
|
} else if (inptr[2] == 0xf0) {
|
||||||
|
/* Compress dest port. */
|
||||||
|
buffer[lowpan6_header_len++] |= 0x01;
|
||||||
|
buffer[lowpan6_header_len++] = inptr[0];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[1];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[3];
|
||||||
|
} else {
|
||||||
|
/* append full ports. */
|
||||||
|
lowpan6_header_len++;
|
||||||
|
buffer[lowpan6_header_len++] = inptr[0];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[1];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[2];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[3];
|
||||||
|
}
|
||||||
|
|
||||||
|
/* elide length and copy checksum */
|
||||||
|
buffer[lowpan6_header_len++] = inptr[6];
|
||||||
|
buffer[lowpan6_header_len++] = inptr[7];
|
||||||
|
|
||||||
|
hidden_header_len += UDP_HLEN;
|
||||||
|
}
|
||||||
|
#endif /* LWIP_UDP */
|
||||||
|
|
||||||
|
*lowpan6_header_len_out = lowpan6_header_len;
|
||||||
|
*hidden_header_len_out = hidden_header_len;
|
||||||
|
|
||||||
|
return ERR_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/** Decompress IPv6 and UDP headers compressed according to RFC 6282
|
||||||
|
*
|
||||||
|
* @param lowpan6_buffer compressed headers, first byte is the dispatch byte
|
||||||
|
* @param lowpan6_bufsize size of lowpan6_buffer (may include data after headers)
|
||||||
|
* @param decomp_buffer buffer where the decompressed headers are stored
|
||||||
|
* @param decomp_bufsize size of decomp_buffer
|
||||||
|
* @param hdr_size_comp returns the size of the compressed headers (skip to get to data)
|
||||||
|
* @param hdr_size_decomp returns the size of the decompressed headers (IPv6 + UDP)
|
||||||
|
* @param datagram_size datagram size from fragments or 0 if unfragmented
|
||||||
|
* @param compressed_size compressed datagram size (for unfragmented rx)
|
||||||
|
* @param lowpan6_contexts context addresses
|
||||||
|
* @param src source address of the outer layer, used for address compression
|
||||||
|
* @param dest destination address of the outer layer, used for address compression
|
||||||
|
* @return ERR_OK if decompression succeeded, an error otherwise
|
||||||
|
*/
|
||||||
|
static err_t
|
||||||
|
lowpan6_decompress_hdr(u8_t *lowpan6_buffer, size_t lowpan6_bufsize,
|
||||||
|
u8_t *decomp_buffer, size_t decomp_bufsize,
|
||||||
|
u16_t *hdr_size_comp, u16_t *hdr_size_decomp,
|
||||||
|
u16_t datagram_size, u16_t compressed_size,
|
||||||
|
ip6_addr_t *lowpan6_contexts,
|
||||||
|
struct lowpan6_link_addr *src, struct lowpan6_link_addr *dest)
|
||||||
|
{
|
||||||
|
u16_t lowpan6_offset;
|
||||||
|
struct ip6_hdr *ip6hdr;
|
||||||
|
s8_t i;
|
||||||
|
u16_t ip6_offset = IP6_HLEN;
|
||||||
|
|
||||||
|
LWIP_ASSERT("lowpan6_buffer != NULL", lowpan6_buffer != NULL);
|
||||||
|
LWIP_ASSERT("decomp_buffer != NULL", decomp_buffer != NULL);
|
||||||
|
LWIP_ASSERT("src != NULL", src != NULL);
|
||||||
|
LWIP_ASSERT("dest != NULL", dest != NULL);
|
||||||
|
LWIP_ASSERT("hdr_size_comp != NULL", hdr_size_comp != NULL);
|
||||||
|
LWIP_ASSERT("dehdr_size_decompst != NULL", hdr_size_decomp != NULL);
|
||||||
|
|
||||||
|
ip6hdr = (struct ip6_hdr *)decomp_buffer;
|
||||||
|
if (decomp_bufsize < IP6_HLEN) {
|
||||||
|
return ERR_MEM;
|
||||||
|
}
|
||||||
|
|
||||||
|
lowpan6_offset = 2;
|
||||||
|
if (lowpan6_buffer[1] & 0x80) {
|
||||||
|
lowpan6_offset++;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Set IPv6 version, traffic class and flow label. */
|
||||||
|
if ((lowpan6_buffer[0] & 0x18) == 0x00) {
|
||||||
|
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset], ((lowpan6_buffer[lowpan6_offset + 1] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset + 3]);
|
||||||
|
lowpan6_offset += 4;
|
||||||
|
} else if ((lowpan6_buffer[0] & 0x18) == 0x08) {
|
||||||
|
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset] & 0xc0, ((lowpan6_buffer[lowpan6_offset] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset + 2]);
|
||||||
|
lowpan6_offset += 3;
|
||||||
|
} else if ((lowpan6_buffer[0] & 0x18) == 0x10) {
|
||||||
|
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset], 0);
|
||||||
|
lowpan6_offset += 1;
|
||||||
|
} else if ((lowpan6_buffer[0] & 0x18) == 0x18) {
|
||||||
|
IP6H_VTCFL_SET(ip6hdr, 6, 0, 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Set Next Header */
|
||||||
|
if ((lowpan6_buffer[0] & 0x04) == 0x00) {
|
||||||
|
IP6H_NEXTH_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
|
||||||
|
} else {
|
||||||
|
/* We should fill this later with NHC decoding */
|
||||||
|
IP6H_NEXTH_SET(ip6hdr, 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Set Hop Limit */
|
||||||
|
if ((lowpan6_buffer[0] & 0x03) == 0x00) {
|
||||||
|
IP6H_HOPLIM_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
|
||||||
|
} else if ((lowpan6_buffer[0] & 0x03) == 0x01) {
|
||||||
|
IP6H_HOPLIM_SET(ip6hdr, 1);
|
||||||
|
} else if ((lowpan6_buffer[0] & 0x03) == 0x02) {
|
||||||
|
IP6H_HOPLIM_SET(ip6hdr, 64);
|
||||||
|
} else if ((lowpan6_buffer[0] & 0x03) == 0x03) {
|
||||||
|
IP6H_HOPLIM_SET(ip6hdr, 255);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Source address decoding. */
|
||||||
|
if ((lowpan6_buffer[1] & 0x40) == 0x00) {
|
||||||
|
/* Stateless compression */
|
||||||
|
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
|
||||||
|
/* copy full address */
|
||||||
|
MEMCPY(&ip6hdr->src.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
||||||
|
lowpan6_offset += 16;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x10) {
|
||||||
|
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
||||||
|
ip6hdr->src.addr[1] = 0;
|
||||||
|
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
||||||
|
lowpan6_offset += 8;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
|
||||||
|
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
||||||
|
ip6hdr->src.addr[1] = 0;
|
||||||
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
||||||
|
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) |
|
||||||
|
lowpan6_buffer[lowpan6_offset + 1]);
|
||||||
|
lowpan6_offset += 2;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
|
||||||
|
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
||||||
|
ip6hdr->src.addr[1] = 0;
|
||||||
|
if (src->addr_len == 2) {
|
||||||
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
||||||
|
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]);
|
||||||
|
} else {
|
||||||
|
ip6hdr->src.addr[2] = lwip_htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) |
|
||||||
|
(src->addr[2] << 8) | src->addr[3]);
|
||||||
|
ip6hdr->src.addr[3] = lwip_htonl((src->addr[4] << 24) | (src->addr[5] << 16) |
|
||||||
|
(src->addr[6] << 8) | src->addr[7]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
/* Stateful compression */
|
||||||
|
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
|
||||||
|
/* ANY address */
|
||||||
|
ip6hdr->src.addr[0] = 0;
|
||||||
|
ip6hdr->src.addr[1] = 0;
|
||||||
|
ip6hdr->src.addr[2] = 0;
|
||||||
|
ip6hdr->src.addr[3] = 0;
|
||||||
|
} else {
|
||||||
|
/* Set prefix from context info */
|
||||||
|
if (lowpan6_buffer[1] & 0x80) {
|
||||||
|
i = (lowpan6_buffer[2] >> 4) & 0x0f;
|
||||||
|
} else {
|
||||||
|
i = 0;
|
||||||
|
}
|
||||||
|
if (i >= LWIP_6LOWPAN_NUM_CONTEXTS) {
|
||||||
|
/* Error */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
||||||
|
ip6hdr->src.addr[0] = lowpan6_contexts[i].addr[0];
|
||||||
|
ip6hdr->src.addr[1] = lowpan6_contexts[i].addr[1];
|
||||||
|
#else
|
||||||
|
LWIP_UNUSED_ARG(lowpan6_contexts);
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((lowpan6_buffer[1] & 0x30) == 0x10) {
|
||||||
|
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
||||||
|
lowpan6_offset += 8;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
|
||||||
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
||||||
|
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset + 1]);
|
||||||
|
lowpan6_offset += 2;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
|
||||||
|
if (src->addr_len == 2) {
|
||||||
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
||||||
|
ip6hdr->src.addr[3] = lwip_htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]);
|
||||||
|
} else {
|
||||||
|
ip6hdr->src.addr[2] = lwip_htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) | (src->addr[2] << 8) | src->addr[3]);
|
||||||
|
ip6hdr->src.addr[3] = lwip_htonl((src->addr[4] << 24) | (src->addr[5] << 16) | (src->addr[6] << 8) | src->addr[7]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Destination address decoding. */
|
||||||
|
if (lowpan6_buffer[1] & 0x08) {
|
||||||
|
/* Multicast destination */
|
||||||
|
if (lowpan6_buffer[1] & 0x04) {
|
||||||
|
/* @todo support stateful multicast addressing */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
|
||||||
|
/* copy full address */
|
||||||
|
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
||||||
|
lowpan6_offset += 16;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
|
||||||
|
ip6hdr->dest.addr[0] = lwip_htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++] << 16));
|
||||||
|
ip6hdr->dest.addr[1] = 0;
|
||||||
|
ip6hdr->dest.addr[2] = lwip_htonl(lowpan6_buffer[lowpan6_offset++]);
|
||||||
|
ip6hdr->dest.addr[3] = lwip_htonl((lowpan6_buffer[lowpan6_offset] << 24) | (lowpan6_buffer[lowpan6_offset + 1] << 16) | (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset + 3]);
|
||||||
|
lowpan6_offset += 4;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
|
||||||
|
ip6hdr->dest.addr[0] = lwip_htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++] << 16));
|
||||||
|
ip6hdr->dest.addr[1] = 0;
|
||||||
|
ip6hdr->dest.addr[2] = 0;
|
||||||
|
ip6hdr->dest.addr[3] = lwip_htonl((lowpan6_buffer[lowpan6_offset] << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset + 2]);
|
||||||
|
lowpan6_offset += 3;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
|
||||||
|
ip6hdr->dest.addr[0] = PP_HTONL(0xff020000UL);
|
||||||
|
ip6hdr->dest.addr[1] = 0;
|
||||||
|
ip6hdr->dest.addr[2] = 0;
|
||||||
|
ip6hdr->dest.addr[3] = lwip_htonl(lowpan6_buffer[lowpan6_offset++]);
|
||||||
|
}
|
||||||
|
|
||||||
|
} else {
|
||||||
|
if (lowpan6_buffer[1] & 0x04) {
|
||||||
|
/* Stateful destination compression */
|
||||||
|
/* Set prefix from context info */
|
||||||
|
if (lowpan6_buffer[1] & 0x80) {
|
||||||
|
i = lowpan6_buffer[2] & 0x0f;
|
||||||
|
} else {
|
||||||
|
i = 0;
|
||||||
|
}
|
||||||
|
if (i >= LWIP_6LOWPAN_NUM_CONTEXTS) {
|
||||||
|
/* Error */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
|
||||||
|
ip6hdr->dest.addr[0] = lowpan6_contexts[i].addr[0];
|
||||||
|
ip6hdr->dest.addr[1] = lowpan6_contexts[i].addr[1];
|
||||||
|
#endif
|
||||||
|
} else {
|
||||||
|
/* Link local address compression */
|
||||||
|
ip6hdr->dest.addr[0] = PP_HTONL(0xfe800000UL);
|
||||||
|
ip6hdr->dest.addr[1] = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
|
||||||
|
/* copy full address */
|
||||||
|
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
||||||
|
lowpan6_offset += 16;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
|
||||||
|
MEMCPY(&ip6hdr->dest.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
||||||
|
lowpan6_offset += 8;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
|
||||||
|
ip6hdr->dest.addr[2] = PP_HTONL(0x000000ffUL);
|
||||||
|
ip6hdr->dest.addr[3] = lwip_htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset + 1]);
|
||||||
|
lowpan6_offset += 2;
|
||||||
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
|
||||||
|
if (dest->addr_len == 2) {
|
||||||
|
ip6hdr->dest.addr[2] = PP_HTONL(0x000000ffUL);
|
||||||
|
ip6hdr->dest.addr[3] = lwip_htonl(0xfe000000UL | (dest->addr[0] << 8) | dest->addr[1]);
|
||||||
|
} else {
|
||||||
|
ip6hdr->dest.addr[2] = lwip_htonl(((dest->addr[0] ^ 2) << 24) | (dest->addr[1] << 16) | dest->addr[2] << 8 | dest->addr[3]);
|
||||||
|
ip6hdr->dest.addr[3] = lwip_htonl((dest->addr[4] << 24) | (dest->addr[5] << 16) | dest->addr[6] << 8 | dest->addr[7]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/* Next Header Compression (NHC) decoding? */
|
||||||
|
if (lowpan6_buffer[0] & 0x04) {
|
||||||
|
#if LWIP_UDP
|
||||||
|
if ((lowpan6_buffer[lowpan6_offset] & 0xf8) == 0xf0) {
|
||||||
|
struct udp_hdr *udphdr;
|
||||||
|
|
||||||
|
/* UDP compression */
|
||||||
|
IP6H_NEXTH_SET(ip6hdr, IP6_NEXTH_UDP);
|
||||||
|
udphdr = (struct udp_hdr *)((u8_t *)decomp_buffer + ip6_offset);
|
||||||
|
if (decomp_bufsize < IP6_HLEN + UDP_HLEN) {
|
||||||
|
return ERR_MEM;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (lowpan6_buffer[lowpan6_offset] & 0x04) {
|
||||||
|
/* @todo support checksum decompress */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Decompress ports */
|
||||||
|
i = lowpan6_buffer[lowpan6_offset++] & 0x03;
|
||||||
|
if (i == 0) {
|
||||||
|
udphdr->src = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
||||||
|
udphdr->dest = lwip_htons(lowpan6_buffer[lowpan6_offset + 2] << 8 | lowpan6_buffer[lowpan6_offset + 3]);
|
||||||
|
lowpan6_offset += 4;
|
||||||
|
} else if (i == 0x01) {
|
||||||
|
udphdr->src = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
||||||
|
udphdr->dest = lwip_htons(0xf000 | lowpan6_buffer[lowpan6_offset + 2]);
|
||||||
|
lowpan6_offset += 3;
|
||||||
|
} else if (i == 0x02) {
|
||||||
|
udphdr->src = lwip_htons(0xf000 | lowpan6_buffer[lowpan6_offset]);
|
||||||
|
udphdr->dest = lwip_htons(lowpan6_buffer[lowpan6_offset + 1] << 8 | lowpan6_buffer[lowpan6_offset + 2]);
|
||||||
|
lowpan6_offset += 3;
|
||||||
|
} else if (i == 0x03) {
|
||||||
|
udphdr->src = lwip_htons(0xf0b0 | ((lowpan6_buffer[lowpan6_offset] >> 4) & 0x0f));
|
||||||
|
udphdr->dest = lwip_htons(0xf0b0 | (lowpan6_buffer[lowpan6_offset] & 0x0f));
|
||||||
|
lowpan6_offset += 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
udphdr->chksum = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
||||||
|
lowpan6_offset += 2;
|
||||||
|
ip6_offset += UDP_HLEN;
|
||||||
|
if (datagram_size == 0) {
|
||||||
|
datagram_size = compressed_size - lowpan6_offset + ip6_offset;
|
||||||
|
}
|
||||||
|
udphdr->len = lwip_htons(datagram_size - IP6_HLEN);
|
||||||
|
|
||||||
|
} else
|
||||||
|
#endif /* LWIP_UDP */
|
||||||
|
{
|
||||||
|
/* @todo support NHC other than UDP */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (datagram_size == 0) {
|
||||||
|
datagram_size = compressed_size - lowpan6_offset + ip6_offset;
|
||||||
|
}
|
||||||
|
/* Infer IPv6 payload length for header */
|
||||||
|
IP6H_PLEN_SET(ip6hdr, datagram_size - IP6_HLEN);
|
||||||
|
|
||||||
|
if (lowpan6_offset > lowpan6_bufsize) {
|
||||||
|
/* input buffer overflow */
|
||||||
|
return ERR_VAL;
|
||||||
|
}
|
||||||
|
*hdr_size_comp = lowpan6_offset;
|
||||||
|
*hdr_size_decomp = ip6_offset;
|
||||||
|
|
||||||
|
return ERR_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
struct pbuf *
|
||||||
|
lowpan6_decompress(struct pbuf *p, u16_t datagram_size, ip6_addr_t *lowpan6_contexts,
|
||||||
|
struct lowpan6_link_addr *src, struct lowpan6_link_addr *dest)
|
||||||
|
{
|
||||||
|
struct pbuf *q;
|
||||||
|
u16_t lowpan6_offset, ip6_offset;
|
||||||
|
err_t err;
|
||||||
|
|
||||||
|
#if LWIP_UDP
|
||||||
|
#define UDP_HLEN_ALLOC UDP_HLEN
|
||||||
|
#else
|
||||||
|
#define UDP_HLEN_ALLOC 0
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Allocate a buffer for decompression. This buffer will be too big and will be
|
||||||
|
trimmed once the final size is known. */
|
||||||
|
q = pbuf_alloc(PBUF_IP, p->len + IP6_HLEN + UDP_HLEN_ALLOC, PBUF_POOL);
|
||||||
|
if (q == NULL) {
|
||||||
|
pbuf_free(p);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
if (q->len < IP6_HLEN + UDP_HLEN_ALLOC) {
|
||||||
|
/* The headers need to fit into the first pbuf */
|
||||||
|
pbuf_free(p);
|
||||||
|
pbuf_free(q);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Decompress the IPv6 (and possibly UDP) header(s) into the new pbuf */
|
||||||
|
err = lowpan6_decompress_hdr((u8_t *)p->payload, p->len, (u8_t *)q->payload, q->len,
|
||||||
|
&lowpan6_offset, &ip6_offset, datagram_size, p->tot_len, lowpan6_contexts, src, dest);
|
||||||
|
if (err != ERR_OK) {
|
||||||
|
pbuf_free(p);
|
||||||
|
pbuf_free(q);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Now we copy leftover contents from p to q, so we have all L2 and L3 headers
|
||||||
|
(and L4?) in a single pbuf: */
|
||||||
|
|
||||||
|
/* Hide the compressed headers in p */
|
||||||
|
pbuf_remove_header(p, lowpan6_offset);
|
||||||
|
/* Temporarily hide the headers in q... */
|
||||||
|
pbuf_remove_header(q, ip6_offset);
|
||||||
|
/* ... copy the rest of p into q... */
|
||||||
|
pbuf_copy(q, p);
|
||||||
|
/* ... and reveal the headers again... */
|
||||||
|
pbuf_add_header_force(q, ip6_offset);
|
||||||
|
/* ... trim the pbuf to its correct size... */
|
||||||
|
pbuf_realloc(q, ip6_offset + p->len);
|
||||||
|
/* ... and cat possibly remaining (data-only) pbufs */
|
||||||
|
if (p->next != NULL) {
|
||||||
|
pbuf_cat(q, p->next);
|
||||||
|
}
|
||||||
|
/* the original (first) pbuf can now be freed */
|
||||||
|
p->next = NULL;
|
||||||
|
pbuf_free(p);
|
||||||
|
|
||||||
|
/* all done */
|
||||||
|
return q;
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif /* LWIP_6LOWPAN_IPHC */
|
||||||
|
#endif /* LWIP_IPV6 */
|
@ -49,7 +49,7 @@
|
|||||||
|
|
||||||
#include "netif/zepif.h"
|
#include "netif/zepif.h"
|
||||||
|
|
||||||
#if LWIP_IPV6 && LWIP_6LOWPAN
|
#if LWIP_IPV6
|
||||||
|
|
||||||
#include "netif/lowpan6.h"
|
#include "netif/lowpan6.h"
|
||||||
#include "lwip/udp.h"
|
#include "lwip/udp.h"
|
||||||
@ -294,4 +294,4 @@ err_ret:
|
|||||||
return err;
|
return err;
|
||||||
}
|
}
|
||||||
|
|
||||||
#endif /* LWIP_IPV6 && LWIP_6LOWPAN */
|
#endif /* LWIP_IPV6 */
|
||||||
|
Loading…
Reference in New Issue
Block a user