159 lines
5.7 KiB
C
159 lines
5.7 KiB
C
/****************************************************************************
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* net/sixlowpan/sixlowpan_utils.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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* 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 logic in 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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/* Frame Organization. The IOB data is retained in the io_data[] field of the
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* IOB structure like:
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*
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* Content Offset
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* +------------------+ 0
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* | Frame Header |
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* +------------------+ g_dataoffset
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* | Procotol Headers |
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* | Data Payload |
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* +------------------+ iob->io_len
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* | Unused |
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* +------------------+ CONFIG_NET_6LOWPAN_FRAMELEN
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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 <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/net/sixlowpan.h>
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#include "sixlowpan/sixlowpan_internal.h"
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#ifdef CONFIG_NET_6LOWPAN
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sixlowpan_frame_hdralloc
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*
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* Description:
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* Allocate space for a header within the packet buffer (dev->d_buf).
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*
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****************************************************************************/
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int sixlowpan_frame_hdralloc(FAR struct iob_s *iob, int size)
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{
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if (size <= FRAME_REMAINING(iob))
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{
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g_dataoffset += size;
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iob->io_len += size;
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return OK;
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}
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return -ENOMEM;
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}
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/****************************************************************************
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* Name: sixlowpan_ipfromrime
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*
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* Description:
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* Use stateless auto-configuration to create an IP address from a rime
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* address:
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*
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* 128 112 96 80 64 48 32 16
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* ---- ---- ---- ---- ---- ---- ---- ----
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* fe80 0000 0000 0000 xxxx xxxx 0000 0000 2-byte Rime address (VALID?)
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* fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte Rime address
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*
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****************************************************************************/
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void sixlowpan_ipfromrime(FAR const struct rimeaddr_s *rime,
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net_ipv6addr_t ipaddr)
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{
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memset(ipaddr, 0, sizeof(net_ipv6addr_t));
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ipaddr[0] = 0xfe80;
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/* We consider only links with IEEE EUI-64 identifier or IEEE 48-bit MAC
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* addresses. NOTE: that CONFIG_NET_6LOWPAN_RIMEADDR_SIZE may be 2 or
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* 8. In the case of 2, we treat the address like an 8 byte address with
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* the lower bytes set to zero.
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*
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* REVISIT: This is just a guess so that I can continue making forward
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* progress. What is the correct policy?
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*/
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memcpy(&ipaddr[4], rime, CONFIG_NET_6LOWPAN_RIMEADDR_SIZE);
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}
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/****************************************************************************
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* Name: sixlowpan_rimefromip
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*
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* Description:
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* Assume stateless auto-configuration to extrate the rime address from
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* an IP address:
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*
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* 128 112 96 80 64 48 32 16
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* ---- ---- ---- ---- ---- ---- ---- ----
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* fe80 0000 0000 0000 xxxx xxxx 0000 0000 2-byte Rime address (VALID?)
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* fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte Rime address
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*
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****************************************************************************/
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void sixlowpan_rimefromip(const net_ipv6addr_t ipaddr,
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FAR struct rimeaddr_s *rime)
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{
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/* REVISIT: See notes about 2 byte addresses in sixlowpan_ipfromrime() */
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DEBUGASSERT(ipaddr[0] == 0xfe80);
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memcpy(rime, &ipaddr[4], CONFIG_NET_6LOWPAN_RIMEADDR_SIZE);
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}
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#endif /* CONFIG_NET_6LOWPAN */
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