├── .cargo └── config.toml ├── .github └── workflows │ └── build.yml ├── .gitignore ├── Cargo.lock ├── Cargo.toml ├── README.md └── src ├── main.rs └── route_nl.rs /.cargo/config.toml: -------------------------------------------------------------------------------- 1 | [target.'cfg(target_env = "musl")'] 2 | rustflags = ["-C", "target-feature=+crt-static"] -------------------------------------------------------------------------------- /.github/workflows/build.yml: -------------------------------------------------------------------------------- 1 | name: release 2 | on: 3 | push: 4 | # Sequence of patterns matched against refs/tags 5 | tags: 6 | - "v*" 7 | - "test-release" 8 | env: 9 | GITHUB_TOKEN: ${{ github.token }} 10 | RUST_BACKTRACE: 1 11 | 12 | permissions: 13 | contents: write 14 | 15 | jobs: 16 | test: 17 | name: ${{ matrix.platform.os_name }} with rust ${{ matrix.toolchain }} 18 | runs-on: ${{ matrix.platform.os }} 19 | strategy: 20 | fail-fast: false 21 | matrix: 22 | platform: 23 | - os_name: Linux-x86_64 24 | os: ubuntu-20.04 25 | target: x86_64-unknown-linux-musl 26 | bin: ns_dup 27 | - os_name: Linux-aarch64 28 | os: ubuntu-20.04 29 | target: aarch64-unknown-linux-musl 30 | bin: ns_dup 31 | - os_name: Linux-arm 32 | os: ubuntu-20.04 33 | target: arm-unknown-linux-musleabi 34 | bin: ns_dup 35 | - os_name: Linux-i686 36 | os: ubuntu-20.04 37 | target: i686-unknown-linux-musl 38 | bin: ns_dup 39 | - os_name: Linux-mips 40 | os: ubuntu-20.04 41 | target: mips-unknown-linux-musl 42 | bin: ns_dup 43 | - os_name: Linux-mipsel 44 | os: ubuntu-20.04 45 | target: mipsel-unknown-linux-musl 46 | bin: ns_dup 47 | - os_name: Linux-mips64 48 | os: ubuntu-20.04 49 | target: mips64-unknown-linux-muslabi64 50 | bin: ns_dup 51 | - os_name: Linux-mips64el 52 | os: ubuntu-20.04 53 | target: mips64el-unknown-linux-muslabi64 54 | bin: ns_dup 55 | - os_name: Linux-riscv64 56 | os: ubuntu-20.04 57 | target: riscv64gc-unknown-linux-gnu 58 | bin: ns_dup 59 | toolchain: 60 | - stable 61 | # - beta 62 | # - nightly 63 | steps: 64 | - uses: actions/checkout@v3 65 | - name: Cache cargo & target directories 66 | uses: Swatinem/rust-cache@v2 67 | with: 68 | key: "v2" 69 | - name: Build binary 70 | uses: houseabsolute/actions-rust-cross@v0 71 | with: 72 | command: "build" 73 | target: ${{ matrix.platform.target }} 74 | toolchain: ${{ matrix.toolchain }} 75 | args: "--locked --release" 76 | strip: true 77 | - name: Upload artifacts 78 | uses: actions/upload-artifact@v3 79 | with: 80 | name: ns_dup-${{ matrix.platform.os_name }} 81 | path: target/${{ matrix.platform.target }}/release/${{ matrix.platform.bin }} 82 | if: matrix.toolchain == 'stable' && github.ref == 'refs/tags/test-release' 83 | - name: Publish GitHub release 84 | uses: svenstaro/upload-release-action@v2 85 | with: 86 | repo_token: ${{ secrets.GITHUB_TOKEN }} 87 | file: target/${{ matrix.platform.target }}/release/${{ matrix.platform.bin }} 88 | asset_name: ns_dup-${{ matrix.platform.os_name }} 89 | tag: ${{ github.ref }} 90 | if: matrix.toolchain == 'stable' && startsWith( github.ref, 'refs/tags/v' ) -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | -------------------------------------------------------------------------------- /Cargo.lock: -------------------------------------------------------------------------------- 1 | # This file is automatically @generated by Cargo. 2 | # It is not intended for manual editing. 3 | version = 4 4 | 5 | [[package]] 6 | name = "aho-corasick" 7 | version = "1.1.3" 8 | source = "registry+https://github.com/rust-lang/crates.io-index" 9 | checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916" 10 | dependencies = [ 11 | "memchr", 12 | ] 13 | 14 | [[package]] 15 | name = "autocfg" 16 | version = "1.4.0" 17 | source = "registry+https://github.com/rust-lang/crates.io-index" 18 | checksum 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"winapi-i686-pc-windows-gnu" 343 | version = "0.4.0" 344 | source = "registry+https://github.com/rust-lang/crates.io-index" 345 | checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6" 346 | 347 | [[package]] 348 | name = "winapi-x86_64-pc-windows-gnu" 349 | version = "0.4.0" 350 | source = "registry+https://github.com/rust-lang/crates.io-index" 351 | checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" 352 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "ns_dup" 3 | version = "0.1.0" 4 | edition = "2021" 5 | 6 | # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html 7 | 8 | [dependencies] 9 | nix = {version = "0.28.0", features = ["socket","net","process"]} 10 | pnet = {version = "*"} 11 | neli = {version= "0.6.5"} 12 | 13 | [profile.release] 14 | lto = "fat" 15 | opt-level = 'z' 16 | panic = 'abort' 17 | strip = true 18 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ns_dup 2 | 3 | （应该能）解决奇葩网络环境（校园网）下的 IPv6 ndp relay问题。 4 | 5 | 6 | ## Usage 7 | 1. 在OpenWrt路由器配置好ndp relay 8 | 2. 运行程序 9 | ```sh 10 | ns_dup 11 | ``` 12 | 13 | ## HOW IT WORKS 14 | 15 | 抓住发向WAN中的IPv6 NS请求，向LAN区域中转发一遍。 16 | 17 | 具体问题成因与解决可以参考下面链接中的文章。 18 | 19 | ### 20 | 21 | ## Readings 22 | 1. https://wjk.moe/2022/%E9%94%90%E6%8D%B7%E6%A0%A1%E5%9B%AD%E7%BD%91IPv6%E7%9A%84%EF%BC%8F64%E5%86%85%E7%BD%91%E4%B8%AD%E7%BB%A7%E9%85%8D%E7%BD%AE%EF%BC%9Andp-proxy%E3%80%81relay/ -------------------------------------------------------------------------------- /src/main.rs: -------------------------------------------------------------------------------- 1 | use std::net::SocketAddrV6; 2 | use std::os::fd::{AsRawFd, FromRawFd, OwnedFd}; 3 | use nix::{errno::Errno, libc, libc::*, sys::socket}; 4 | use nix::sys::socket::{LinkAddr, MsgFlags, SockaddrIn6}; 5 | use pnet::packet::{icmpv6, Packet}; 6 | use pnet::packet::icmpv6::ndp::NdpOption; 7 | use std::ffi::OsString; 8 | use std::env; 9 | mod route_nl; 10 | 11 | fn main() { 12 | let args: Vec = env::args().collect(); 13 | if args.len() != 3 { 14 | println!("Usage: {} ", args[0]); 15 | return; 16 | } 17 | let wan_name = &args[1]; 18 | let lan_name = &args[2]; 19 | 20 | let mut val = 2; 21 | let socket_fd = unsafe { 22 | let raw_socket = libc::socket( 23 | libc::AF_PACKET, 24 | libc::SOCK_RAW | libc::SOCK_CLOEXEC, 25 | (libc::ETH_P_ALL as u16).to_be() as i32, 26 | ); 27 | match raw_socket { 28 | -1 => Err(Errno::last()), 29 | fd => { 30 | // Safe because libc::socket returned success 31 | Ok(OwnedFd::from_raw_fd(fd)) 32 | } 33 | } 34 | }.expect("Failed to create socket"); 35 | 36 | let mut bpf = unsafe { 37 | [ 38 | BPF_STMT((BPF_LD | BPF_H | BPF_ABS) as u16, 12), 39 | BPF_JUMP((BPF_JMP | BPF_JEQ | BPF_K) as u16, 0x86dd as u32, 0, 5), 40 | BPF_STMT((BPF_LD | BPF_B | BPF_ABS) as u16, 14+6), 41 | BPF_JUMP((BPF_JMP | BPF_JEQ | BPF_K) as u16, IPPROTO_ICMPV6 as u32, 0, 3), 42 | BPF_STMT((BPF_LD | BPF_B | BPF_ABS) as u16, 14+40), 43 | BPF_JUMP((BPF_JMP | BPF_JEQ | BPF_K) as u16, 135, 0, 1), 44 | BPF_STMT((BPF_RET | BPF_K) as u16, 0xffffffff), 45 | BPF_STMT((BPF_RET | BPF_K) as u16, 0), 46 | ] 47 | }; 48 | let bpf_prog = sock_fprog { 49 | len: bpf.len() as u16, 50 | filter: bpf.as_mut_ptr(), 51 | }; 52 | let res = unsafe { 53 | let res = libc::setsockopt( 54 | socket_fd.as_raw_fd(), 55 | libc::SOL_SOCKET, 56 | libc::SO_ATTACH_FILTER, 57 | &bpf_prog as *const _ as *const libc::c_void, 58 | std::mem::size_of_val(&bpf_prog) as u32, 59 | ); 60 | Errno::result(res).map(drop) 61 | }; 62 | res.expect("Failed to set filter"); 63 | let ping_fd = unsafe { 64 | let raw_socket = libc::socket( 65 | libc::AF_INET6, 66 | libc::SOCK_RAW | libc::SOCK_CLOEXEC, 67 | libc::IPPROTO_ICMPV6, 68 | ); 69 | match raw_socket { 70 | -1 => Err(Errno::last()), 71 | fd => { 72 | // Safe because libc::socket returned success 73 | Ok(OwnedFd::from_raw_fd(fd)) 74 | } 75 | } 76 | }.expect("Failed to create socket"); 77 | 78 | 79 | let mut buffer = [0u8; 1500]; 80 | 81 | let wan_iface = pnet::datalink::interfaces() 82 | .into_iter() 83 | .find(|iface| iface.name == *wan_name) 84 | .expect("Failed to find interface"); 85 | println!("{:?}", wan_iface); 86 | let lan_iface = pnet::datalink::interfaces() 87 | .into_iter() 88 | .find(|iface| iface.name == *lan_name) 89 | .expect("Failed to find interface"); 90 | 91 | socket::setsockopt(&ping_fd, socket::sockopt::BindToDevice, &OsString::from(lan_iface.name)).unwrap(); 92 | 93 | unsafe { 94 | let res = libc::setsockopt( 95 | ping_fd.as_raw_fd(), 96 | libc::IPPROTO_RAW, 97 | libc::IPV6_CHECKSUM, 98 | &val as *const c_int as *const c_void, 99 | std::mem::size_of_val(&val) as u32, 100 | ); 101 | Errno::result(res).map(drop) 102 | }.unwrap(); 103 | val = 255; 104 | socket::setsockopt(&ping_fd, socket::sockopt::Ipv6MulticastHops, &val).unwrap(); 105 | let filter = [0xff; 8]; 106 | unsafe { 107 | let res = libc::setsockopt( 108 | ping_fd.as_raw_fd(), 109 | libc::IPPROTO_ICMPV6, 110 | 1, // ICMPV6_FILTER 111 | filter.as_ptr() as *const c_void, 112 | std::mem::size_of_val(&filter) as u32, 113 | ); 114 | Errno::result(res).map(drop) 115 | }.unwrap(); 116 | loop { 117 | let (read_len, _) = socket::recvfrom::(socket_fd.as_raw_fd(), &mut buffer).unwrap(); 118 | 119 | let eth_packet = pnet::packet::ethernet::EthernetPacket::new(&buffer[..read_len]).unwrap(); 120 | if eth_packet.get_source() == wan_iface.mac.unwrap(){ 121 | 122 | let mut ns = pnet::packet::icmpv6::ndp::MutableNeighborSolicitPacket::new(&mut buffer[14+40..read_len]).unwrap(); 123 | // println!("{:?}",ns); 124 | // ns.set_options(&[]); 125 | ns.set_options(&[NdpOption{option_type:icmpv6::ndp::NdpOptionTypes::SourceLLAddr, length:1, data: lan_iface.mac.unwrap().octets().to_vec()}]); 126 | // println!("{:?}",ns); 127 | let dest = SockaddrIn6::from( 128 | SocketAddrV6::new(ns.get_target_addr(), 0, 0, 0) 129 | ); 130 | ns.set_checksum(0xffff); 131 | 132 | route_nl::mod_route(ns.get_target_addr(), lan_iface.index as i32, true).unwrap(); 133 | socket::sendto(ping_fd.as_raw_fd(), ns.packet(),&dest, MsgFlags::empty()).unwrap(); 134 | route_nl::mod_route(ns.get_target_addr(), lan_iface.index as i32, false).unwrap(); 135 | // println!("{:?}",ns) 136 | } 137 | 138 | } 139 | 140 | 141 | } 142 | -------------------------------------------------------------------------------- /src/route_nl.rs: -------------------------------------------------------------------------------- 1 | use std::net::Ipv6Addr; 2 | 3 | use neli::{ 4 | consts::{ 5 | nl::{ *}, 6 | rtnl::{RtAddrFamily, RtScope, RtTable, Rta, Rtm, RtmFFlags, Rtn, Rtprot}, 7 | socket::*, 8 | }, 9 | err::NlError, 10 | nl::{NlPayload, Nlmsghdr}, 11 | rtnl::{Rtattr, Rtmsg}, 12 | socket::NlSocketHandle, 13 | types::RtBuffer, 14 | }; 15 | // To be implemented 16 | // Add route to the routing table 17 | 18 | 19 | pub fn mod_route(dst: Ipv6Addr, index: i32, is_add: bool) -> Result<(), NlError> { 20 | let mut socket = NlSocketHandle::connect(NlFamily::Route, Some(nix::unistd::getpid().as_raw() as u32), &[])?; 21 | socket.block()?; 22 | let mut route_rtbuff = RtBuffer::new(); 23 | 24 | route_rtbuff.push(Rtattr::new(None, Rta::Dst, dst.octets().to_vec())?); 25 | route_rtbuff.push(Rtattr::new(None, Rta::Priority, 1023)?); 26 | route_rtbuff.push(Rtattr::new(None, Rta::Oif, index)?); 27 | 28 | let rtmsg = Rtmsg { 29 | rtm_family: RtAddrFamily::Inet6, 30 | rtm_dst_len: 128, 31 | rtm_src_len: 0, 32 | rtm_tos: 0, 33 | rtm_table: RtTable::Main, 34 | rtm_protocol: if is_add { 35 | Rtprot::Static 36 | } else { 37 | Rtprot::Unspec 38 | }, 39 | rtm_scope: if is_add { 40 | RtScope::Link 41 | } else { 42 | RtScope::Nowhere 43 | }, 44 | rtm_type: if is_add { Rtn::Unicast } else { Rtn::Unspec }, 45 | rtm_flags: RtmFFlags::empty(), 46 | rtattrs: route_rtbuff, 47 | }; 48 | let nlmsg = Nlmsghdr::new( 49 | None, 50 | if is_add { Rtm::Newroute } else { Rtm::Delroute }, 51 | NlmFFlags::new(&[ 52 | NlmF::Request, 53 | NlmF::Ack, 54 | if is_add { NlmF::Create } else { NlmF::Replace }, 55 | ]), 56 | None, 57 | None, 58 | NlPayload::Payload(rtmsg), 59 | ); 60 | socket.send(nlmsg)?; 61 | // Wait for the ack 62 | socket.recv()?; 63 | Ok(()) 64 | } 65 | 66 | --------------------------------------------------------------------------------