150 lines
6.2 KiB
C
150 lines
6.2 KiB
C
/****************************************************************************
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* net/sixlowpan/sixlowpan_hc1.c
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*
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* Copyright (C) 2017, Gregory Nutt, all rights reserved
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Derives from Contiki:
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*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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* All rights reserved.
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* Authors: Adam Dunkels <adam@sics.se>
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* Nicolas Tsiftes <nvt@sics.se>
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* Niclas Finne <nfi@sics.se>
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* Mathilde Durvy <mdurvy@cisco.com>
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* Julien Abeille <jabeille@cisco.com>
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* Joakim Eriksson <joakime@sics.se>
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* Joel Hoglund <joel@sics.se>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/net/netdev.h>
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#include "sixlowpan/sixlowpan.h"
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#ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC1
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sixlowpan_compresshdr_hc1
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*
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* Description:
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* Compress IP/UDP header using HC1 and HC_UDP
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*
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* This function is called by the 6lowpan code to create a compressed
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* 6lowpan packet in the packetbuf buffer from a full IPv6 packet in the
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* uip_buf buffer.
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*
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* If we can compress everything, we use HC1 dispatch, if not we use
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* IPv6 dispatch. We can compress everything if:
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*
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* - IP version is
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* - Flow label and traffic class are 0
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* - Both src and dest ip addresses are link local
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* - Both src and dest interface ID are recoverable from lower layer
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* header
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* - Next header is either ICMP, UDP or TCP
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*
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* Moreover, if next header is UDP, we try to compress it using HC_UDP.
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* This is feasible is both ports are between F0B0 and F0B0 + 15\n\n
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*
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* Resulting header structure:
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* - For ICMP, TCP, non compressed UDP\n
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* HC1 encoding = 11111010 (UDP) 11111110 (TCP) 11111100 (ICMP)\n
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* 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | LoWPAN HC1 Dsp | HC1 encoding | IPv6 Hop limit| L4 hdr + data|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | ...
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* - For compressed UDP
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* HC1 encoding = 11111011, HC_UDP encoding = 11100000\n
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* 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | LoWPAN HC1 Dsp| HC1 encoding | HC_UDP encod.| IPv6 Hop limit|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | src p.| dst p.| UDP checksum | L4 data...
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Input Parmeters:
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* dev - A reference to the IEE802.15.4 network device state
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* destaddr - L2 destination address, needed to compress the IP
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* destination field
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void sixlowpan_compresshdr_hc1(FAR struct net_driver_s *dev,
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FAR struct rimeaddr_s *destaddr)
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{
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/* REVISIT: To be provided */
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}
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/****************************************************************************
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* Name: sixlowpan_uncompresshdr_hc1
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*
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* Description:
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* Uncompress HC1 (and HC_UDP) headers and put them in sixlowpan_buf
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*
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* This function is called by the input function when the dispatch is
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* HC1. It processes the packet in the rime buffer, uncompresses the
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* header fields, and copies the result in the sixlowpan buffer. At the
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* end of the decompression, g_rime_hdrlen and uncompressed_hdr_len
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* are set to the appropriate values
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*
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* Input Parameters:
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* dev - A reference to the IEE802.15.4 network device state
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* iplen - Equal to 0 if the packet is not a fragment (IP length is then
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* inferred from the L2 length), non 0 if the packet is a 1st
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* fragment.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void sixlowpan_uncompresshdr_hc1(FAR struct net_driver_s *dev,
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uint16_t iplen)
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{
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/* REVISIT: To be provided */
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}
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#endif /* CONFIG_NET_6LOWPAN_COMPRESSION_HC1 */
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