313 lines
10 KiB
C
313 lines
10 KiB
C
/**
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* \addtogroup sicslowpan
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* @{
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*/
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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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*
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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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* This file is part of the Contiki operating system.
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*
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* $Id: sicslowpan.h,v 1.12 2010/03/17 20:57:25 joxe Exp $
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*/
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/**
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* \file
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* Header file for the 6lowpan implementation
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* (RFC4944 and draft-hui-6lowpan-hc-01)
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* \author Adam Dunkels <adam@sics.se>
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* \author Nicolas Tsiftes <nvt@sics.se>
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* \author Niclas Finne <nfi@sics.se>
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* \author Mathilde Durvy <mdurvy@cisco.com>
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* \author Julien Abeille <jabeille@cisco.com>
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*/
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#ifndef __SICSLOWPAN_H__
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#define __SICSLOWPAN_H__
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#include "net/uip.h"
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#include "net/mac/mac.h"
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/**
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* \name General sicslowpan defines
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* @{
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*/
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/* Min and Max compressible UDP ports */
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#define SICSLOWPAN_UDP_PORT_MIN 0xF0B0
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#define SICSLOWPAN_UDP_PORT_MAX 0xF0BF /* F0B0 + 15 */
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/** @} */
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/**
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* \name 6lowpan compressions
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* @{
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*/
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#define SICSLOWPAN_COMPRESSION_IPV6 0
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#define SICSLOWPAN_COMPRESSION_HC1 1
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#define SICSLOWPAN_COMPRESSION_HC06 2
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/** @} */
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/**
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* \name 6lowpan dispatches
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* @{
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*/
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#define SICSLOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
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#define SICSLOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */
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#define SICSLOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
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#define SICSLOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */
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#define SICSLOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */
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/** @} */
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/** \name HC1 encoding
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* @{
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*/
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#define SICSLOWPAN_HC1_NH_UDP 0x02
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#define SICSLOWPAN_HC1_NH_TCP 0x06
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#define SICSLOWPAN_HC1_NH_ICMP6 0x04
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/** @} */
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/** \name HC_UDP encoding (works together with HC1)
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* @{
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*/
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#define SICSLOWPAN_HC_UDP_ALL_C 0xE0
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/** @} */
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/**
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* \name IPHC encoding
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* @{
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*/
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/*
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* Values of fields within the IPHC encoding first byte
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* (C stands for compressed and I for inline)
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*/
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#define SICSLOWPAN_IPHC_FL_C 0x10
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#define SICSLOWPAN_IPHC_TC_C 0x08
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#define SICSLOWPAN_IPHC_NH_C 0x04
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#define SICSLOWPAN_IPHC_TTL_1 0x01
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#define SICSLOWPAN_IPHC_TTL_64 0x02
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#define SICSLOWPAN_IPHC_TTL_255 0x03
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#define SICSLOWPAN_IPHC_TTL_I 0x00
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/* Values of fields within the IPHC encoding second byte */
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#define SICSLOWPAN_IPHC_CID 0x80
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#define SICSLOWPAN_IPHC_SAC 0x40
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#define SICSLOWPAN_IPHC_SAM_00 0x00
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#define SICSLOWPAN_IPHC_SAM_01 0x10
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#define SICSLOWPAN_IPHC_SAM_10 0x20
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#define SICSLOWPAN_IPHC_SAM_11 0x30
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#define SICSLOWPAN_IPHC_SAM_BIT 4
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#define SICSLOWPAN_IPHC_M 0x08
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#define SICSLOWPAN_IPHC_DAC 0x04
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#define SICSLOWPAN_IPHC_DAM_00 0x00
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#define SICSLOWPAN_IPHC_DAM_01 0x01
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#define SICSLOWPAN_IPHC_DAM_10 0x02
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#define SICSLOWPAN_IPHC_DAM_11 0x03
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#define SICSLOWPAN_IPHC_DAM_BIT 0
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/* Link local context number */
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#define SICSLOWPAN_IPHC_ADDR_CONTEXT_LL 0
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/* 16-bit multicast addresses compression */
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#define SICSLOWPAN_IPHC_MCAST_RANGE 0xA0
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/** @} */
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/* NHC_EXT_HDR */
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#define SICSLOWPAN_NHC_MASK 0xF0
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#define SICSLOWPAN_NHC_EXT_HDR 0xE0
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/**
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* \name LOWPAN_UDP encoding (works together with IPHC)
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* @{
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*/
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#define SICSLOWPAN_NHC_UDP_MASK 0xF8
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#define SICSLOWPAN_NHC_UDP_ID 0xF0
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#define SICSLOWPAN_NHC_UDP_C 0xF3
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#define SICSLOWPAN_NHC_UDP_I 0xF0
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/** @} */
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/**
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* \name The 6lowpan "headers" length
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* @{
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*/
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#define SICSLOWPAN_IPV6_HDR_LEN 1 /*one byte*/
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#define SICSLOWPAN_HC1_HDR_LEN 3
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#define SICSLOWPAN_HC1_HC_UDP_HDR_LEN 7
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#define SICSLOWPAN_FRAG1_HDR_LEN 4
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#define SICSLOWPAN_FRAGN_HDR_LEN 5
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/** @} */
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/**
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* \brief The header for fragments
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* \note We do not define different structures for FRAG1
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* and FRAGN headers, which are different. For FRAG1, the
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* offset field is just not used
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*/
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/* struct sicslowpan_frag_hdr { */
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/* u16_t dispatch_size; */
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/* u16_t tag; */
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/* u8_t offset; */
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/* }; */
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/**
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* \brief The HC1 header when HC_UDP is not used
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*
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* When all fields are compressed and HC_UDP is not used,
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* we use this structure. If HC_UDP is used, the ttl is
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* in another spot, and we use the sicslowpan_hc1_hc_udp
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* structure
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*/
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/* struct sicslowpan_hc1_hdr { */
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/* u8_t dispatch; */
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/* u8_t encoding; */
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/* u8_t ttl; */
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/* }; */
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/**
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* \brief HC1 followed by HC_UDP
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*/
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/* struct sicslowpan_hc1_hc_udp_hdr { */
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/* u8_t dispatch; */
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/* u8_t hc1_encoding; */
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/* u8_t hc_udp_encoding; */
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/* u8_t ttl; */
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/* u8_t ports; */
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/* u16_t udpchksum; */
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/* }; */
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/**
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* \brief An address context for IPHC address compression
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* each context can have upto 8 bytes
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*/
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struct sicslowpan_addr_context {
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u8_t used; /* possibly use as prefix-length */
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u8_t number;
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u8_t prefix[8];
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};
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/**
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* \name Address compressibility test functions
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* @{
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*/
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/**
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* \brief check whether we can compress the IID in
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* address 'a' to 16 bits.
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* This is used for unicast addresses only, and is true
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* if first 49 bits of IID are 0
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*/
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#define sicslowpan_is_iid_16_bit_compressable(a) \
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((((a)->u16[4]) == 0) && \
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(((a)->u16[5]) == 0) && \
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(((a)->u16[6]) == 0) && \
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((((a)->u8[14]) & 0x80) == 0))
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/**
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* \brief check whether the 9-bit group-id of the
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* compressed multicast address is known. It is true
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* if the 9-bit group is the all nodes or all routers
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* group.
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* \param a is typed u8_t *
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*/
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#define sicslowpan_is_mcast_addr_decompressable(a) \
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(((*a & 0x01) == 0) && \
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((*(a + 1) == 0x01) || (*(a + 1) == 0x02)))
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/**
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* \brief check whether the 112-bit group-id of the
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* multicast address is mappable to a 9-bit group-id
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* It is true if the group is the all nodes or all
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* routers group.
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*/
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#define sicslowpan_is_mcast_addr_compressable(a) \
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((((a)->u16[1]) == 0) && \
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(((a)->u16[2]) == 0) && \
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(((a)->u16[3]) == 0) && \
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(((a)->u16[4]) == 0) && \
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(((a)->u16[5]) == 0) && \
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(((a)->u16[6]) == 0) && \
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(((a)->u8[14]) == 0) && \
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((((a)->u8[15]) == 1) || (((a)->u8[15]) == 2)))
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/* FFXX::00XX:XXXX:XXXX */
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#define sicslowpan_is_mcast_addr_compressable48(a) \
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((((a)->u16[1]) == 0) && \
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(((a)->u16[2]) == 0) && \
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(((a)->u16[3]) == 0) && \
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(((a)->u16[4]) == 0) && \
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(((a)->u8[10]) == 0))
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/* FFXX::00XX:XXXX */
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#define sicslowpan_is_mcast_addr_compressable32(a) \
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((((a)->u16[1]) == 0) && \
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(((a)->u16[2]) == 0) && \
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(((a)->u16[3]) == 0) && \
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(((a)->u16[4]) == 0) && \
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(((a)->u16[5]) == 0) && \
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(((a)->u8[12]) == 0))
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/* FF02::00XX */
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#define sicslowpan_is_mcast_addr_compressable8(a) \
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((((a)->u8[1]) == 2) && \
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(((a)->u16[1]) == 0) && \
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(((a)->u16[2]) == 0) && \
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(((a)->u16[3]) == 0) && \
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(((a)->u16[4]) == 0) && \
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(((a)->u16[5]) == 0) && \
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(((a)->u16[6]) == 0) && \
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(((a)->u8[14]) == 0))
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/** @} */
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/**
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* The structure of a next header compressor.
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*
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* TODO: needs more parameters when compressing extension headers, etc.
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*/
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struct sicslowpan_nh_compressor {
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int (* is_compressable)(uint8_t next_header);
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/** compress next header (TCP/UDP, etc) - ptr points to next header to
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compress */
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int (* compress)(uint8_t *compressed, uint8_t *uncompressed_len);
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/** uncompress next header (TCP/UDP, etc) - ptr points to next header to
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uncompress */
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int (* uncompress)(uint8_t *compressed, uint8_t *lowpanbuf, uint8_t *uncompressed_len);
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};
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extern const struct network_driver sicslowpan_driver;
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extern const struct mac_driver *sicslowpan_mac;
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#endif /* __SICSLOWPAN_H__ */
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/** @} */
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