mirror of https://github.com/ARMmbed/mbed-os.git
185 lines
7.4 KiB
C
185 lines
7.4 KiB
C
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/*
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* Copyright (c) 2013-2017, Arm Limited and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _CIPV6_H
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#define _CIPV6_H
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/* MTU defined in RFC 4944 */
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#ifndef LOWPAN_MTU
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#define LOWPAN_MTU 1280
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#endif
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/* The max MTU we'll obey from a Router Advertisement */
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#ifndef LOWPAN_MAX_MTU
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#define LOWPAN_MAX_MTU LOWPAN_HARD_MTU_LIMIT
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#endif
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/* The "physical" limit - due to the datagram_size field in the FRAG headers */
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#ifndef LOWPAN_HARD_MTU_LIMIT
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#define LOWPAN_HARD_MTU_LIMIT 2047
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#endif
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buffer_t *lowpan_up(buffer_t *buf);
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buffer_t *lowpan_down(buffer_t *buf);
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/* Bits in IPHC header, first byte (RFC 6282)
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* 0 1
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
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* | 0 | 1 | 1 | TF |NH | HLIM |CID|SAC| SAM | M |DAC| DAM |
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* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
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*
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*/
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#define HC_LOWPAN_DISPATCH LOWPAN_DISPATCH_IPHC /* 0x60 */
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#define HC_TF_MASK 0x18
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#define HC_TF_ECN_DSCP_FLOW_LABEL 0x00
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#define HC_TF_ECN_FLOW_LABEL 0x08
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#define HC_TF_ECN_DSCP 0x10
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#define HC_TF_ELIDED 0x18
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#define HC_NEXT_HEADER_MASK 0x04
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#define HC_HOP_LIMIT_MASK 0x03
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#define HC_HOP_LIMIT_CARRIED_IN_LINE 0x00
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#define HC_HOP_LIMIT_1 0x01
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#define HC_HOP_LIMIT_64 0x02
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#define HC_HOP_LIMIT_255 0x03
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/* Bits in IPHC Dispatch header, second byte */
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#define HC_CIDE_COMP 0x80
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#define HC_SRCADR_COMP 0x40
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#define HC_SRC_ADR_MODE_MASK 0x30
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#define HC_SRC_ADR_128_BIT 0x00
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#define HC_SRC_ADR_64_BIT 0x10
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#define HC_SRC_ADR_16_BIT 0x20
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#define HC_SRC_ADR_FROM_MAC 0x30
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#define HC_MULTICAST_COMP 0x08
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#define HC_DSTADR_COMP 0x04
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#define HC_DST_ADR_MODE_MASK 0x03
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#define HC_DST_ADR_128_BIT 0x00
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#define HC_DST_ADR_64_BIT 0x01
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#define HC_DST_ADR_16_BIT 0x02
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#define HC_DST_ADR_FROM_MAC 0x03
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#define HC_128BIT_MULTICAST 0x00
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#define HC_48BIT_MULTICAST 0x01 //FFxx::xx:xxxx:xxxx
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#define HC_32BIT_MULTICAST 0x02 //FFxx::xx:xxxx
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#define HC_8BIT_MULTICAST 0x03 //FF02::xx
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#define HC_48BIT_CONTEXT_MULTICAST 0x04 //FFxx:xxLL:PPPP:PPPP:PPPP:PPPP:xxxx:xxxx
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/* 6LoWPAN Types
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*
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* Pattern Header Type
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* +------------+-----------------------------------------------+
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* | 00 xxxxxx | NALP - Not a LoWPAN frame |
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* | 01 000000 | ESC - Additional Dispatch byte follows |
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* | 01 000001 | IPv6 - Uncompressed IPv6 Addresses |
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* | 01 000010 | LOWPAN_HC1 - LOWPAN_HC1 compressed IPv6 |
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* | 01 000011 | LOWPAN_DFF - Depth-First Forwarding (RFC6971) |
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* | 01 000100 | reserved - Reserved for future use |
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* | ... | reserved - Reserved for future use |
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* | 01 001111 | reserved - Reserved for future use |
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* | 01 010000 | LOWPAN_BC0 - LOWPAN_BC0 broadcast |
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* | 01 010001 | reserved - Reserved for future use |
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* | ... | reserved - Reserved for future use |
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* | 01 011111 | reserved - Reserved for future use |
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* | 01 1xxxxx | LOWPAN_IPHC- RFC 6282 IPv6 Header Compression |
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* | 10 xxxxxx | MESH - Mesh Header |
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* | 11 000xxx | FRAG1 - Fragmentation Header (first) |
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* | 11 001000 | reserved - Reserved for future use |
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* | ... | reserved - Reserved for future use |
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* | 11 011111 | reserved - Reserved for future use |
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* | 11 100xxx | FRAGN - Fragmentation Header (subsequent)|
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* | 11 101000 | reserved - Reserved for future use |
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* | ... | reserved - Reserved for future use |
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* | 11 111111 | reserved - Reserved for future use |
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* +------------+-----------------------------------------------+
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*
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*/
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#define LOWPAN_NALP 0x00 /* 00 xxxxxx Not LoWPAN */
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#define LOWPAN_NALP_MASK 0xC0
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#define LOWPAN_DISPATCH_ESC 0x40 /* RFC 6282 supercedes RFC 4944 */
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#define LOWPAN_DISPATCH_IPV6 0x41
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#define LOWPAN_DISPATCH_HC1 0x42
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#define LOWPAN_DISPATCH_DFF 0x43 /* RFC 6971 */
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#define LOWPAN_DISPATCH_BC0 0x50
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#define LOWPAN_DISPATCH_IPHC 0x60 /* 01 1xxxxx IPHC */
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#define LOWPAN_DISPATCH_IPHC_MASK 0xE0
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#define LOWPAN_MESH 0x80 /* 10 xxxxxx MESH */
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#define LOWPAN_MESH_MASK 0xC0
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#define LOWPAN_FRAG1 0xC0 /* 11 000xxx FRAG1 */
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#define LOWPAN_FRAG1_MASK 0xF8
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#define LOWPAN_FRAGN 0xE0 /* 11 100xxx FRAGN */
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#define LOWPAN_FRAGN_MASK 0xF8
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#define LOWPAN_FRAGN_BIT 0x20 /* xx 1xxxxx distinguish FRAGN */
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#define LOWPAN_FRAG 0xC0 /* 11 x00xxx FRAG1/FRAGN */
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#define LOWPAN_FRAG_MASK 0xD8
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/*
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* 6LoWPAN Next Header Compression codes
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*
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* 00000000 to 11011111: (unassigned)
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* 1110000N: IPv6 Hop-by-Hop Options Header [RFC6282]
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* 1110001N: IPv6 Routing Header [RFC6282]
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* 1110010N: IPv6 Fragment Header [RFC6282]
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* 1110011N: IPv6 Destination Options Header [RFC6282]
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* 1110100N: IPv6 Mobility Header [RFC6282]
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* 1110111N: IPv6 Header [RFC6282]
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* 11110CPP: UDP Header [RFC6282]
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* 11111000 to 11111110: (unassigned)
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*
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* XXX cipv6_up() currently relies on IPv6 Next Header values and NHC codes
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* being disjoint - it does not distinguish the two code spaces.
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*/
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#define NHC_EXT_HEADER 0xE0 /* 1110xxxx */
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#define NHC_EXT_HEADER_MASK 0xF0
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#define NHC_UDP 0xF0 /* 11110xxx */
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#define NHC_UDP_MASK 0xF8
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#define NHC_EXT_NH 0x01
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#define NHC_EXT_ID_MASK 0xFE
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#define NHC_EXT_HOP_BY_HOP 0xE0
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#define NHC_EXT_ROUTING 0xE2
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#define NHC_EXT_FRAG 0xE4
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#define NHC_EXT_DEST_OPT 0xE6
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#define NHC_EXT_MOBILITY 0xE8
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#define NHC_EXT_IPV6 0xEE
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/*
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* RFC 6282
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*
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* 4.3.3. UDP LOWPAN_NHC Format
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*
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*
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* 0 1 2 3 4 5 6 7
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* +---+---+---+---+---+---+---+---+
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* | 1 | 1 | 1 | 1 | 0 | C | P |
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* +---+---+---+---+---+---+---+---+
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*
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* Figure 14: UDP Header Encoding
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*/
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#define NHC_UDP_PORT_COMPRESS_NONE 0
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#define NHC_UDP_PORT_COMPRESS_DST 1
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#define NHC_UDP_PORT_COMPRESS_SRC 2
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#define NHC_UDP_PORT_COMPRESS_BOTH 3
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#define NHC_UDP_PORT_COMPRESS_MASK 3
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#define NHC_UDP_CKSUM_COMPRESS 4
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#endif
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