/* * Copyright (c) 2013-2017, Arm Limited and affiliates. * SPDX-License-Identifier: Apache-2.0 * * 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. */ #ifndef _CIPV6_H #define _CIPV6_H /* MTU defined in RFC 4944 */ #ifndef LOWPAN_MTU #define LOWPAN_MTU 1280 #endif /* The max MTU we'll obey from a Router Advertisement */ #ifndef LOWPAN_MAX_MTU #define LOWPAN_MAX_MTU LOWPAN_HARD_MTU_LIMIT #endif /* The "physical" limit - due to the datagram_size field in the FRAG headers */ #ifndef LOWPAN_HARD_MTU_LIMIT #define LOWPAN_HARD_MTU_LIMIT 2047 #endif buffer_t *lowpan_up(buffer_t *buf); buffer_t *lowpan_down(buffer_t *buf); /* Bits in IPHC header, first byte (RFC 6282) * 0 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ * | 0 | 1 | 1 | TF |NH | HLIM |CID|SAC| SAM | M |DAC| DAM | * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ * */ #define HC_LOWPAN_DISPATCH LOWPAN_DISPATCH_IPHC /* 0x60 */ #define HC_TF_MASK 0x18 #define HC_TF_ECN_DSCP_FLOW_LABEL 0x00 #define HC_TF_ECN_FLOW_LABEL 0x08 #define HC_TF_ECN_DSCP 0x10 #define HC_TF_ELIDED 0x18 #define HC_NEXT_HEADER_MASK 0x04 #define HC_HOP_LIMIT_MASK 0x03 #define HC_HOP_LIMIT_CARRIED_IN_LINE 0x00 #define HC_HOP_LIMIT_1 0x01 #define HC_HOP_LIMIT_64 0x02 #define HC_HOP_LIMIT_255 0x03 /* Bits in IPHC Dispatch header, second byte */ #define HC_CIDE_COMP 0x80 #define HC_SRCADR_COMP 0x40 #define HC_SRC_ADR_MODE_MASK 0x30 #define HC_SRC_ADR_128_BIT 0x00 #define HC_SRC_ADR_64_BIT 0x10 #define HC_SRC_ADR_16_BIT 0x20 #define HC_SRC_ADR_FROM_MAC 0x30 #define HC_MULTICAST_COMP 0x08 #define HC_DSTADR_COMP 0x04 #define HC_DST_ADR_MODE_MASK 0x03 #define HC_DST_ADR_128_BIT 0x00 #define HC_DST_ADR_64_BIT 0x01 #define HC_DST_ADR_16_BIT 0x02 #define HC_DST_ADR_FROM_MAC 0x03 #define HC_128BIT_MULTICAST 0x00 #define HC_48BIT_MULTICAST 0x01 //FFxx::xx:xxxx:xxxx #define HC_32BIT_MULTICAST 0x02 //FFxx::xx:xxxx #define HC_8BIT_MULTICAST 0x03 //FF02::xx #define HC_48BIT_CONTEXT_MULTICAST 0x04 //FFxx:xxLL:PPPP:PPPP:PPPP:PPPP:xxxx:xxxx /* 6LoWPAN Types * * Pattern Header Type * +------------+-----------------------------------------------+ * | 00 xxxxxx | NALP - Not a LoWPAN frame | * | 01 000000 | ESC - Additional Dispatch byte follows | * | 01 000001 | IPv6 - Uncompressed IPv6 Addresses | * | 01 000010 | LOWPAN_HC1 - LOWPAN_HC1 compressed IPv6 | * | 01 000011 | LOWPAN_DFF - Depth-First Forwarding (RFC6971) | * | 01 000100 | reserved - Reserved for future use | * | ... | reserved - Reserved for future use | * | 01 001111 | reserved - Reserved for future use | * | 01 010000 | LOWPAN_BC0 - LOWPAN_BC0 broadcast | * | 01 010001 | reserved - Reserved for future use | * | ... | reserved - Reserved for future use | * | 01 011111 | reserved - Reserved for future use | * | 01 1xxxxx | LOWPAN_IPHC- RFC 6282 IPv6 Header Compression | * | 10 xxxxxx | MESH - Mesh Header | * | 11 000xxx | FRAG1 - Fragmentation Header (first) | * | 11 001000 | reserved - Reserved for future use | * | ... | reserved - Reserved for future use | * | 11 011111 | reserved - Reserved for future use | * | 11 100xxx | FRAGN - Fragmentation Header (subsequent)| * | 11 101000 | reserved - Reserved for future use | * | ... | reserved - Reserved for future use | * | 11 111111 | reserved - Reserved for future use | * +------------+-----------------------------------------------+ * */ #define LOWPAN_NALP 0x00 /* 00 xxxxxx Not LoWPAN */ #define LOWPAN_NALP_MASK 0xC0 #define LOWPAN_DISPATCH_ESC 0x40 /* RFC 6282 supercedes RFC 4944 */ #define LOWPAN_DISPATCH_IPV6 0x41 #define LOWPAN_DISPATCH_HC1 0x42 #define LOWPAN_DISPATCH_DFF 0x43 /* RFC 6971 */ #define LOWPAN_DISPATCH_BC0 0x50 #define LOWPAN_DISPATCH_IPHC 0x60 /* 01 1xxxxx IPHC */ #define LOWPAN_DISPATCH_IPHC_MASK 0xE0 #define LOWPAN_MESH 0x80 /* 10 xxxxxx MESH */ #define LOWPAN_MESH_MASK 0xC0 #define LOWPAN_FRAG1 0xC0 /* 11 000xxx FRAG1 */ #define LOWPAN_FRAG1_MASK 0xF8 #define LOWPAN_FRAGN 0xE0 /* 11 100xxx FRAGN */ #define LOWPAN_FRAGN_MASK 0xF8 #define LOWPAN_FRAGN_BIT 0x20 /* xx 1xxxxx distinguish FRAGN */ #define LOWPAN_FRAG 0xC0 /* 11 x00xxx FRAG1/FRAGN */ #define LOWPAN_FRAG_MASK 0xD8 /* * 6LoWPAN Next Header Compression codes * * 00000000 to 11011111: (unassigned) * 1110000N: IPv6 Hop-by-Hop Options Header [RFC6282] * 1110001N: IPv6 Routing Header [RFC6282] * 1110010N: IPv6 Fragment Header [RFC6282] * 1110011N: IPv6 Destination Options Header [RFC6282] * 1110100N: IPv6 Mobility Header [RFC6282] * 1110111N: IPv6 Header [RFC6282] * 11110CPP: UDP Header [RFC6282] * 11111000 to 11111110: (unassigned) * * XXX cipv6_up() currently relies on IPv6 Next Header values and NHC codes * being disjoint - it does not distinguish the two code spaces. */ #define NHC_EXT_HEADER 0xE0 /* 1110xxxx */ #define NHC_EXT_HEADER_MASK 0xF0 #define NHC_UDP 0xF0 /* 11110xxx */ #define NHC_UDP_MASK 0xF8 #define NHC_EXT_NH 0x01 #define NHC_EXT_ID_MASK 0xFE #define NHC_EXT_HOP_BY_HOP 0xE0 #define NHC_EXT_ROUTING 0xE2 #define NHC_EXT_FRAG 0xE4 #define NHC_EXT_DEST_OPT 0xE6 #define NHC_EXT_MOBILITY 0xE8 #define NHC_EXT_IPV6 0xEE /* * RFC 6282 * * 4.3.3. UDP LOWPAN_NHC Format * * * 0 1 2 3 4 5 6 7 * +---+---+---+---+---+---+---+---+ * | 1 | 1 | 1 | 1 | 0 | C | P | * +---+---+---+---+---+---+---+---+ * * Figure 14: UDP Header Encoding */ #define NHC_UDP_PORT_COMPRESS_NONE 0 #define NHC_UDP_PORT_COMPRESS_DST 1 #define NHC_UDP_PORT_COMPRESS_SRC 2 #define NHC_UDP_PORT_COMPRESS_BOTH 3 #define NHC_UDP_PORT_COMPRESS_MASK 3 #define NHC_UDP_CKSUM_COMPRESS 4 #endif