/**************************************************************************** * net/sixlowpan/sixlowpan_utils.c * * Copyright (C) 2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Copyright (C) 2017, Gregory Nutt, all rights reserved * Author: Gregory Nutt * * Derives from logic in Contiki: * * Copyright (c) 2008, Swedish Institute of Computer Science. * All rights reserved. * Authors: Adam Dunkels * Nicolas Tsiftes * Niclas Finne * Mathilde Durvy * Julien Abeille * Joakim Eriksson * Joel Hoglund * * 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. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include "sixlowpan/sixlowpan_internal.h" #ifdef CONFIG_NET_6LOWPAN /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: sixlowpan_ipfromrime * * Description: * Create a link local IPv6 address from a rime address: * * 128 112 96 80 64 48 32 16 * ---- ---- ---- ---- ---- ---- ---- ---- * fe80 0000 0000 0000 0000 00ff fe00 xxxx 2-byte Rime address IEEE 48-bit MAC * fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte Rime address IEEE EUI-64 * ****************************************************************************/ void sixlowpan_ipfromrime(FAR const struct rimeaddr_s *rime, net_ipv6addr_t ipaddr) { /* We consider only links with IEEE EUI-64 identifier or IEEE 48-bit MAC * addresses. */ memset(ipaddr, 0, sizeof(net_ipv6addr_t)); ipaddr[0] = HTONS(0xfe80); #if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2 ipaddr[5] = HTONS(0x00ff); ipaddr[6] = HTONS(0xfe00); memcpy(&ipaddr[7], rime, CONFIG_NET_6LOWPAN_RIMEADDR_SIZE); ipaddr[7] ^= HTONS(0x0200); #else memcpy(&ipaddr[4], rime, CONFIG_NET_6LOWPAN_RIMEADDR_SIZE); ipaddr[4] ^= HTONS(0x0200); #endif } /**************************************************************************** * Name: sixlowpan_rimefromip * * Description: * Extract the rime address from a link local IPv6 address: * * 128 112 96 80 64 48 32 16 * ---- ---- ---- ---- ---- ---- ---- ---- * fe80 0000 0000 0000 0000 00ff fe00 xxxx 2-byte Rime address IEEE 48-bit MAC * fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte Rime address IEEE EUI-64 * ****************************************************************************/ void sixlowpan_rimefromip(const net_ipv6addr_t ipaddr, FAR struct rimeaddr_s *rime) { /* REVISIT: See notes about 2 byte addresses in sixlowpan_ipfromrime() */ DEBUGASSERT(ipaddr[0] == HTONS(0xfe80)); #if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2 memcpy(rime, &ipaddr[7], CONFIG_NET_6LOWPAN_RIMEADDR_SIZE); #else memcpy(rime, &ipaddr[4], CONFIG_NET_6LOWPAN_RIMEADDR_SIZE); #endif rime->u8[0] ^= 0x02; } /**************************************************************************** * Name: sixlowpan_ismacbased * * Description: * Check if the MAC address is encoded in the IP address: * * 128 112 96 80 64 48 32 16 * ---- ---- ---- ---- ---- ---- ---- ---- * fe80 0000 0000 0000 0000 00ff fe00 xxxx 2-byte Rime address IEEE 48-bit MAC * fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte Rime address IEEE EUI-64 * ****************************************************************************/ bool sixlowpan_ismacbased(const net_ipv6addr_t ipaddr, FAR const struct rimeaddr_s *rime) { FAR const uint8_t *rimeptr = rime->u8; #if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2 return (ipaddr[5] == HTONS(0x00ff) && ipaddr[6] == HTONS(0xfe00) && ipaddr[7] == htons((GETINT16(rimeptr, 0) ^ 0x0200))); #else /* CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 */ return (ipaddr[4] == htons((GETINT16(rimeptr, 0) ^ 0x0200)) && ipaddr[5] == GETINT16(rimeptr, 2) && ipaddr[6] == GETINT16(rimeptr, 4) && ipaddr[7] == GETINT16(rimeptr, 6)); #endif } #endif /* CONFIG_NET_6LOWPAN */