| /* sicslowpan_compression.h - IPv6 header Compression */ |
| |
| /* |
| * Copyright (c) 2015 Intel Corporation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * 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. |
| * |
| */ |
| |
| /** |
| * \file |
| * 6lowpan implementation (RFC4944 and draft-ietf-6lowpan-hc-06) |
| * |
| * \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> |
| * \author Joakim Eriksson <joakime@sics.se> |
| * \author Joel Hoglund <joel@sics.se> |
| */ |
| |
| #ifndef SICSLOWPAN_COMPRESSION_H_ |
| #define SICSLOWPAN_COMPRESSION_H_ |
| |
| #include "contiki/sicslowpan/compression.h" |
| |
| extern const struct compression sicslowpan_compression; |
| |
| /** |
| * \name General sicslowpan defines |
| * @{ |
| */ |
| /* Min and Max compressible UDP ports - IPHC */ |
| #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_IPHC 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 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 An address context for IPHC address compression |
| * each context can have upto 8 bytes |
| */ |
| struct sicslowpan_addr_context { |
| uint8_t used; /* possibly use as prefix-length */ |
| uint8_t number; |
| uint8_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 |
| * if the address is on the format \<PREFIX\>::0000:00ff:fe00:XXXX |
| * NOTE: we currently assume 64-bits prefixes |
| */ |
| #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 uint8_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)) |
| |
| /** @} */ |
| |
| #endif /* SICSLOWPAN_COMPRESSION_H_ */ |
