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972c1992d2
contiki/core/net/sicslowpan.h
Joakim Eriksson 972c1992d2 16-bit addr compression fix
2011-03-06 22:34:16 +01:00

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/**
* \addtogroup sicslowpan
* @{
*/
/*
* Copyright (c) 2008, Swedish Institute of Computer Science.
* 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. 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.
*
* This file is part of the Contiki operating system.
*
* $Id: sicslowpan.h,v 1.13 2010/03/26 10:28:51 joxe Exp $
*/
/**
* \file
* Header file for the 6lowpan implementation
* (RFC4944 and draft-hui-6lowpan-hc-01)
* \author Adam Dunkels <adam@sics.se>
* \author Nicolas Tsiftes <nvt@sics.se>
* \author Niclas Finne <nfi@sics.se>
* \author Mathilde Durvy <mdurvy@cisco.com>
* \author Julien Abeille <jabeille@cisco.com>
*/
#ifndef __SICSLOWPAN_H__
#define __SICSLOWPAN_H__
#include "net/uip.h"
#include "net/mac/mac.h"
/**
* \name General sicslowpan defines
* @{
*/
/* Min and Max compressible UDP ports - HC06 */
#define SICSLOWPAN_UDP_4_BIT_PORT_MIN 0xF0B0
#define SICSLOWPAN_UDP_4_BIT_PORT_MAX 0xF0BF /* F0B0 + 15 */
#define SICSLOWPAN_UDP_8_BIT_PORT_MIN 0xF000
#define SICSLOWPAN_UDP_8_BIT_PORT_MAX 0xF0FF /* F000 + 255 */
/** @} */
/**
* \name 6lowpan compressions
* @{
*/
#define SICSLOWPAN_COMPRESSION_IPV6 0
#define SICSLOWPAN_COMPRESSION_HC1 1
#define SICSLOWPAN_COMPRESSION_HC06 2
/** @} */
/**
* \name 6lowpan dispatches
* @{
*/
#define SICSLOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
#define SICSLOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */
#define SICSLOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
#define SICSLOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */
#define SICSLOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */
/** @} */
/** \name HC1 encoding
* @{
*/
#define SICSLOWPAN_HC1_NH_UDP 0x02
#define SICSLOWPAN_HC1_NH_TCP 0x06
#define SICSLOWPAN_HC1_NH_ICMP6 0x04
/** @} */
/** \name HC_UDP encoding (works together with HC1)
* @{
*/
#define SICSLOWPAN_HC_UDP_ALL_C 0xE0
/** @} */
/**
* \name IPHC encoding
* @{
*/
/*
* Values of fields within the IPHC encoding first byte
* (C stands for compressed and I for inline)
*/
#define SICSLOWPAN_IPHC_FL_C 0x10
#define SICSLOWPAN_IPHC_TC_C 0x08
#define SICSLOWPAN_IPHC_NH_C 0x04
#define SICSLOWPAN_IPHC_TTL_1 0x01
#define SICSLOWPAN_IPHC_TTL_64 0x02
#define SICSLOWPAN_IPHC_TTL_255 0x03
#define SICSLOWPAN_IPHC_TTL_I 0x00
/* Values of fields within the IPHC encoding second byte */
#define SICSLOWPAN_IPHC_CID 0x80
#define SICSLOWPAN_IPHC_SAC 0x40
#define SICSLOWPAN_IPHC_SAM_00 0x00
#define SICSLOWPAN_IPHC_SAM_01 0x10
#define SICSLOWPAN_IPHC_SAM_10 0x20
#define SICSLOWPAN_IPHC_SAM_11 0x30
#define SICSLOWPAN_IPHC_SAM_BIT 4
#define SICSLOWPAN_IPHC_M 0x08
#define SICSLOWPAN_IPHC_DAC 0x04
#define SICSLOWPAN_IPHC_DAM_00 0x00
#define SICSLOWPAN_IPHC_DAM_01 0x01
#define SICSLOWPAN_IPHC_DAM_10 0x02
#define SICSLOWPAN_IPHC_DAM_11 0x03
#define SICSLOWPAN_IPHC_DAM_BIT 0
/* Link local context number */
#define SICSLOWPAN_IPHC_ADDR_CONTEXT_LL 0
/* 16-bit multicast addresses compression */
#define SICSLOWPAN_IPHC_MCAST_RANGE 0xA0
/** @} */
/* NHC_EXT_HDR */
#define SICSLOWPAN_NHC_MASK 0xF0
#define SICSLOWPAN_NHC_EXT_HDR 0xE0
/**
* \name LOWPAN_UDP encoding (works together with IPHC)
* @{
*/
/**
* \name LOWPAN_UDP encoding (works together with IPHC)
* @{
*/
#define SICSLOWPAN_NHC_UDP_MASK 0xF8
#define SICSLOWPAN_NHC_UDP_ID 0xF0
#define SICSLOWPAN_NHC_UDP_CHECKSUMC 0x04
#define SICSLOWPAN_NHC_UDP_CHECKSUMI 0x00
/* values for port compression, _with checksum_ ie bit 5 set to 0 */
#define SICSLOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */
#define SICSLOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline, dest = 0xF0 + 8 bit inline */
#define SICSLOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline, dest = 16 bit inline */
#define SICSLOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
/** @} */
/**
* \name The 6lowpan "headers" length
* @{
*/
#define SICSLOWPAN_IPV6_HDR_LEN 1 /*one byte*/
#define SICSLOWPAN_HC1_HDR_LEN 3
#define SICSLOWPAN_HC1_HC_UDP_HDR_LEN 7
#define SICSLOWPAN_FRAG1_HDR_LEN 4
#define SICSLOWPAN_FRAGN_HDR_LEN 5
/** @} */
/**
* \brief The header for fragments
* \note We do not define different structures for FRAG1
* and FRAGN headers, which are different. For FRAG1, the
* offset field is just not used
*/
/* struct sicslowpan_frag_hdr { */
/* u16_t dispatch_size; */
/* u16_t tag; */
/* u8_t offset; */
/* }; */
/**
* \brief The HC1 header when HC_UDP is not used
*
* When all fields are compressed and HC_UDP is not used,
* we use this structure. If HC_UDP is used, the ttl is
* in another spot, and we use the sicslowpan_hc1_hc_udp
* structure
*/
/* struct sicslowpan_hc1_hdr { */
/* u8_t dispatch; */
/* u8_t encoding; */
/* u8_t ttl; */
/* }; */
/**
* \brief HC1 followed by HC_UDP
*/
/* struct sicslowpan_hc1_hc_udp_hdr { */
/* u8_t dispatch; */
/* u8_t hc1_encoding; */
/* u8_t hc_udp_encoding; */
/* u8_t ttl; */
/* u8_t ports; */
/* u16_t udpchksum; */
/* }; */
/**
* \brief An address context for IPHC address compression
* each context can have upto 8 bytes
*/
struct sicslowpan_addr_context {
u8_t used; /* possibly use as prefix-length */
u8_t number;
u8_t prefix[8];
};
/**
* \name Address compressibility test functions
* @{
*/
/**
* \brief check whether we can compress the IID in
* address 'a' to 16 bits.
* This is used for unicast addresses only, and is true
* the address is on the format ::0000:00ff:fe00:XXXX
*/
#define sicslowpan_is_iid_16_bit_compressable(a) \
((((a)->u16[4]) == 0) && \
(((a)->u8[10]) == 0) && \
(((a)->u8[11]) == 0xff) && \
(((a)->u8[12]) == 0xfe) && \
(((a)->u8[13]) == 0))
/**
* \brief check whether the 9-bit group-id of the
* compressed multicast address is known. It is true
* if the 9-bit group is the all nodes or all routers
* group.
* \param a is typed u8_t *
*/
#define sicslowpan_is_mcast_addr_decompressable(a) \
(((*a & 0x01) == 0) && \
((*(a + 1) == 0x01) || (*(a + 1) == 0x02)))
/**
* \brief check whether the 112-bit group-id of the
* multicast address is mappable to a 9-bit group-id
* It is true if the group is the all nodes or all
* routers group.
*/
#define sicslowpan_is_mcast_addr_compressable(a) \
((((a)->u16[1]) == 0) && \
(((a)->u16[2]) == 0) && \
(((a)->u16[3]) == 0) && \
(((a)->u16[4]) == 0) && \
(((a)->u16[5]) == 0) && \
(((a)->u16[6]) == 0) && \
(((a)->u8[14]) == 0) && \
((((a)->u8[15]) == 1) || (((a)->u8[15]) == 2)))
/* FFXX::00XX:XXXX:XXXX */
#define sicslowpan_is_mcast_addr_compressable48(a) \
((((a)->u16[1]) == 0) && \
(((a)->u16[2]) == 0) && \
(((a)->u16[3]) == 0) && \
(((a)->u16[4]) == 0) && \
(((a)->u8[10]) == 0))
/* FFXX::00XX:XXXX */
#define sicslowpan_is_mcast_addr_compressable32(a) \
((((a)->u16[1]) == 0) && \
(((a)->u16[2]) == 0) && \
(((a)->u16[3]) == 0) && \
(((a)->u16[4]) == 0) && \
(((a)->u16[5]) == 0) && \
(((a)->u8[12]) == 0))
/* FF02::00XX */
#define sicslowpan_is_mcast_addr_compressable8(a) \
((((a)->u8[1]) == 2) && \
(((a)->u16[1]) == 0) && \
(((a)->u16[2]) == 0) && \
(((a)->u16[3]) == 0) && \
(((a)->u16[4]) == 0) && \
(((a)->u16[5]) == 0) && \
(((a)->u16[6]) == 0) && \
(((a)->u8[14]) == 0))
/** @} */
/**
* The structure of a next header compressor.
*
* TODO: needs more parameters when compressing extension headers, etc.
*/
struct sicslowpan_nh_compressor {
int (* is_compressable)(uint8_t next_header);
/** compress next header (TCP/UDP, etc) - ptr points to next header to
compress */
int (* compress)(uint8_t *compressed, uint8_t *uncompressed_len);
/** uncompress next header (TCP/UDP, etc) - ptr points to next header to
uncompress */
int (* uncompress)(uint8_t *compressed, uint8_t *lowpanbuf, uint8_t *uncompressed_len);
};
extern const struct network_driver sicslowpan_driver;
extern const struct mac_driver *sicslowpan_mac;
#endif /* __SICSLOWPAN_H__ */
/** @} */
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