1 /* 2 * Copyright (c) 2024 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef CLAT_CONSTANTS_H 16 #define CLAT_CONSTANTS_H 17 18 #include <string> 19 20 namespace OHOS { 21 namespace NetManagerStandard { 22 enum Nat464UpdateFlag { 23 NAT464_SERVICE_CONTINUE, 24 NAT464_SERVICE_STOP, 25 }; 26 27 enum Nat464ServiceState { 28 NAT464_SERVICE_STATE_IDLE, 29 NAT464_SERVICE_STATE_DISCOVERING, 30 NAT464_SERVICE_STATE_RUNNING, 31 }; 32 33 enum ClatdConvertType { 34 CONVERT_FROM_V6_TO_V4, 35 CONVERT_FROM_V4_TO_V6, 36 }; 37 38 enum ClatdPacketPosition { 39 CLATD_TUNHDR, 40 CLATD_IPHDR, 41 CLATD_FRAGHDR, 42 CLATD_TPHDR, 43 CLATD_ICMP_IPHDR, 44 CLATD_ICMP_FRAGHDR, 45 CLATD_ICMP_TPHDR, 46 CLATD_PAYLOAD, 47 CLATD_MAX 48 }; 49 50 static constexpr size_t IP_TP_PACKET_POSITION_DELTA = 2; // packet position delta between CLATD_IPHDR and CLATD_TPHDR 51 52 static constexpr size_t TCP_HDR_MIN_LEN = 20; 53 static constexpr size_t TCP_HDR_MAX_LEN = 60; 54 static constexpr int IPV4_HDR_MIN_LEN = 20; 55 static constexpr int IPV6_HDR_LEN = 40; 56 static constexpr int FRAG_HDR_LEN = 8; 57 static constexpr int MTU_DELTA = IPV6_HDR_LEN - IPV4_HDR_MIN_LEN + FRAG_HDR_LEN; 58 static constexpr int CLAT_MAX_MTU = 65536 + MTU_DELTA; 59 static constexpr int CLAT_DATA_LINK_HDR_LEN = 22; // 14 bytes ethernet header + at most 8 bytes VLAN Tag 60 61 static constexpr int CLAT_IPV6_MIN_MTU = 1280; 62 static constexpr uint16_t TP_CSUM_UNNECESSARY = 1; 63 64 static constexpr const char *CLAT_PREFIX = "tunv4-"; 65 static constexpr int CLAT_PREFIX_BYTE_LEN = 12; 66 static constexpr int CLAT_SUFFIX_OFFSET_IN_32 = 3; // 96-bit prefix + 32-bit suffix, the suffix is the 4th 32-bit word 67 68 static constexpr int WORD_32BIT_IN_BYTE_UNIT = 4; // 4-bytes unit for tcphdr->doff and iphdr->ihl 69 70 static constexpr uint8_t IPV6_VERSION_FLAG = 0x60; 71 static constexpr int V4ADDR_BIT_LEN = 32; 72 static constexpr int V6ADDR_BIT_LEN = 128; 73 static constexpr const char *INIT_V4ADDR_STRING = "192.0.0.0"; // Reserved ip addr in RFC 5736 74 static constexpr int INIT_V4ADDR_PREFIX_BIT_LEN = 29; 75 76 static constexpr size_t CLAT_V6ADDR_RANDOMIZE_OFFSET = 8; 77 static constexpr size_t CLAT_V6ADDR_RANDOMIZE_BIT_LENGTH = 8; 78 static constexpr size_t CLAT_V6ADDR_NEUTRALIZE_OFFSET = 3; 79 80 static constexpr uint16_t WKN_DNS_PORT = 53; 81 static constexpr const char *DEFAULT_V4_ADDR = "0.0.0.0/0"; 82 83 static constexpr const char *SOLICITED_NODE_PREFIX = "ff02::1:ff00:0000"; // Solicited-Node Address in RFC 4291 84 static constexpr size_t SOLICITED_NODE_SUFFIX_OFFSET = 13; 85 86 static constexpr uint16_t IPV6_FRAG_OFFSET_BIT_SUPPLEMENTARY = 3; // offset field in ipv6 fragment header is top 13 bit 87 88 static constexpr int INVALID_IFINDEX = 0; 89 90 static constexpr const char *IFACE_LINK_UP = "up"; 91 92 static constexpr size_t IPV6_SRC_OFFSET = 8; 93 static constexpr uint8_t NDP_NOUNCE_OPT = 14; 94 95 static constexpr const char *IPV4_ONLY_HOST = "ipv4only.arpa."; 96 97 static constexpr uint32_t INITIAL_DISCOVERY_CYCLE_MS = 100; 98 99 static constexpr uint32_t MAX_DISCOVERY_CYCLE_MS = 100000; 100 101 static constexpr uint32_t DISCOVERY_CYCLE_MULTIPLIER = 2; 102 103 static constexpr uint32_t CLATD_TIMER_CYCLE_MS = 5000; 104 105 } // namespace NetManagerStandard 106 } // namespace OHOS 107 #endif