├── .ccls ├── .github └── workflows │ └── c-cpp.yml ├── .gitignore ├── LICENSE ├── Makefile ├── README.md ├── attach.sh ├── config.h ├── detach.sh ├── warp-ebpf.c └── warp-register.py /.ccls: -------------------------------------------------------------------------------- 1 | clang 2 | -target bpf 3 | -I/usr/include/x86_64-linux-gnu 4 | -------------------------------------------------------------------------------- /.github/workflows/c-cpp.yml: -------------------------------------------------------------------------------- 1 | name: CI 2 | 3 | on: 4 | push: 5 | branches: 6 | - '*' 7 | pull_request: 8 | branches: 9 | - '*' 10 | 11 | jobs: 12 | build: 13 | runs-on: ${{ matrix.os }} 14 | strategy: 15 | matrix: 16 | include: 17 | - os: ubuntu-22.04 18 | deps: sudo apt-get install -y libbpf-dev libc6-dev-i386 19 | - os: ubuntu-20.04 20 | deps: sudo apt-get install -y libbpf-dev libc6-dev-i386 21 | 22 | steps: 23 | - uses: actions/checkout@v3 24 | - name: install build deps 25 | run: ${{ matrix.deps }} 26 | - name: build 27 | run: make 28 | - name: check 29 | run: file warp-ebpf.o 30 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.o 2 | .idea 3 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | , 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | all: warp-ebpf.o 2 | 3 | warp-ebpf.o: warp-ebpf.c config.h 4 | clang -O2 -I/usr/include/x86_64-linux-gnu -target bpf -mcpu=probe -c warp-ebpf.c -o $@ 5 | 6 | clean: 7 | rm *.o 8 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | What 2 | -------------------------- 3 | 4 | A tc-bpf action to rewrite `wg.reserved_zero[3]` to `client_id` required by warp, and vice versa for ingress. 5 | 6 | Usage 7 | -------------------------- 8 | 9 | * Register with `warp-register.py` first, save the result into `/etc/wireguard/cf.conf` 10 | * Edit `config.h` 11 | * Find line `static const __u8 warp_private[3] = {11, 45, 14};` 12 | * Change `{11, 45, 14}` to the content of `ClientID` in `cf.conf` above 13 | * `make` to build the eBPF module 14 | * `./attach.sh ` to load it into your system 15 | * `wg-quick up cf` start the wireguard tunnel 16 | * `./detach.sh` to remove it from your system 17 | 18 | Build Dependencies 19 | -------------------------- 20 | Debian/Ubuntu: `sudo apt install build-essential clang libc6-dev-i386 libbpf-dev` 21 | 22 | Arch: `sudo pacman -S base-devel clang libbpf` 23 | 24 | TODO 25 | -------------------------- 26 | 27 | * IPv6 support 28 | 29 | Credits 30 | -------------------------- 31 | * [Ritare/1919](https://github.com/Riatre/1919): eBPF example 32 | * [iBug/warp-helper](https://gist.github.com/iBug/3107fd4d5af6a4ea7bcea4a8090dcc7e): original wg-warp-helper 33 | * [Wireguard Protocol](https://www.wireguard.com/protocol/): Wireguard protocol specification 34 | -------------------------------------------------------------------------------- /attach.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash -e 2 | 3 | cd "$(dirname "$0")" 4 | 5 | [ -f "warp-ebpf.o" ] || exit 1 6 | 7 | tc qdisc add dev "$1" clsact 8 | tc filter add dev "$1" egress bpf direct-action obj warp-ebpf.o section warp 9 | tc filter add dev "$1" ingress bpf direct-action obj warp-ebpf.o section warp 10 | 11 | LOWER_IF="`(basename $(realpath $(ls -d /sys/class/net/$1/lower_*)) || echo $1)2>/dev/null`" 12 | # ethtool -K "$LOWER_IF" tx off || true 13 | -------------------------------------------------------------------------------- /config.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #define MAKE_IPv4(a, b, c, d) ((((__u32) a) << 24) | ((b) << 16) | ((c) << 8) | (d)) 4 | 5 | struct warp_conversion { 6 | // warp client_id, all zero means EOF of configuration 7 | __u8 warp_private[3]; 8 | // convert to warp format when endpoint (IP, Port) is source 9 | // (also implies converting to zeros when endpoint (IP, Port) is destination) 10 | bool is_source; 11 | // the (IP, port) to match 12 | struct sockaddr_in endpoint; 13 | }; 14 | 15 | // configuration, allowing multiple warp instances on different (IP, port) combinations 16 | static struct warp_conversion config[] = { 17 | { 18 | .warp_private = {11, 45, 14}, 19 | .is_source = false, // means convert to warp at TX, to zero at RX 20 | .endpoint = { 21 | .sin_family = AF_INET, 22 | .sin_addr = { 23 | // 162.159.192.1 is the IPv4 address of engage.cloudflareclient.com 24 | .s_addr = __bpf_constant_htonl(MAKE_IPv4(162, 159, 192, 1)), 25 | }, 26 | .sin_port = __bpf_constant_htons(2408), 27 | }, 28 | }, 29 | {0} // means EOF 30 | }; 31 | 32 | // original reserved zero, don't touch it. 33 | static const __u8 wg_reserved[3] = {0x00, 0x00, 0x00}; 34 | -------------------------------------------------------------------------------- /detach.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash -e 2 | 3 | tc qdisc del dev "$1" clsact 4 | LOWER_IF="`(basename $(realpath $(ls -d /sys/class/net/$1/lower_*)) || echo $1)2>/dev/null`" 5 | # ethtool -K "$LOWER_IF" tx on || true 6 | -------------------------------------------------------------------------------- /warp-ebpf.c: -------------------------------------------------------------------------------- 1 | // SPDX-License-Identifier: GPL-2.0-or-later 2 | 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | 14 | #include 15 | #include 16 | 17 | #include "config.h" 18 | 19 | char LICENSE[] SEC("license") = "GPL"; 20 | 21 | // i'd like to use __builtin_memcmp or even memcmp 22 | // but https://bugs.llvm.org/show_bug.cgi?id=26218 prevents this 23 | static inline int bpf_memcmp(const void *s1, const void *s2, size_t n) { 24 | const __u8* u1 = s1, *u2 = s2; 25 | for (; --n; ++u1, ++u2) { 26 | if (*u1 != *u2) { 27 | return *u1 - *u2; 28 | } 29 | } 30 | return 0; 31 | } 32 | 33 | static inline int rewrite_wg_reserved_ipv4(struct __sk_buff *skb, struct warp_conversion *conv) { 34 | void *data = (void *)(long)skb->data; 35 | void *data_end = (void *)(long)skb->data_end; 36 | 37 | if (skb->protocol != __constant_htons(ETH_P_IP)) 38 | return TC_ACT_UNSPEC; 39 | 40 | __u32 net_offset = 0; 41 | struct ethhdr *eth = data; 42 | 43 | if (data + sizeof(struct ethhdr) <= data_end && eth->h_proto == skb->protocol) { 44 | net_offset = sizeof(struct ethhdr); 45 | } 46 | 47 | __u32 prot_offset = net_offset + sizeof(struct iphdr); 48 | 49 | // we just check if udp message contains wg reserved_zero bytes 50 | size_t min_packet_size = net_offset + sizeof(struct iphdr) + sizeof(struct udphdr) + 4; 51 | if (data + min_packet_size > data_end) 52 | return TC_ACT_UNSPEC; 53 | 54 | struct iphdr *iph = data + net_offset; 55 | struct udphdr *udph = data + net_offset + sizeof(struct iphdr); 56 | __u32 message_offset = net_offset + sizeof(struct iphdr) + sizeof(struct udphdr); 57 | __u8 *wg_header = data + message_offset; 58 | 59 | if (iph->version != IPVERSION || iph->protocol != IPPROTO_UDP) 60 | return TC_ACT_UNSPEC; 61 | 62 | for (struct warp_conversion *i = conv; bpf_memcmp(i->warp_private, wg_reserved, 3); ++i) { 63 | if (iph->saddr == i->endpoint.sin_addr.s_addr && udph->source == i->endpoint.sin_port) { 64 | if (i->is_source && !bpf_memcmp(wg_reserved, wg_header + 1, 3)) { 65 | __builtin_memcpy(wg_header + 1, i->warp_private, 3); 66 | return TC_ACT_PIPE; 67 | } else if (!i->is_source && !bpf_memcmp(i->warp_private, wg_header + 1, 3)) { 68 | __builtin_memcpy(wg_header + 1, wg_reserved, 3); 69 | return TC_ACT_PIPE; 70 | } 71 | } else if (iph->daddr == i->endpoint.sin_addr.s_addr && udph->dest == i->endpoint.sin_port) { 72 | if (i->is_source && !bpf_memcmp(i->warp_private, wg_header + 1, 3)) { 73 | __builtin_memcpy(wg_header + 1, wg_reserved, 3); 74 | return TC_ACT_PIPE; 75 | } else if (!i->is_source && !bpf_memcmp(wg_reserved, wg_header + 1, 3)) { 76 | __builtin_memcpy(wg_header + 1, i->warp_private, 3); 77 | return TC_ACT_PIPE; 78 | } 79 | } 80 | } 81 | 82 | return TC_ACT_UNSPEC; 83 | } 84 | 85 | SEC("warp") 86 | int conversion(struct __sk_buff *skb) { 87 | return rewrite_wg_reserved_ipv4(skb, config); 88 | } 89 | -------------------------------------------------------------------------------- /warp-register.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python3 2 | # Copyright (C) iBug 2022 3 | 4 | import base64 5 | import datetime 6 | import json 7 | import random 8 | import requests 9 | import string 10 | import subprocess 11 | 12 | 13 | def genstring(k): 14 | return ''.join(random.choices(string.ascii_lowercase + string.digits, k=k)) 15 | 16 | 17 | def genkey(): 18 | return subprocess.run(['wg', 'genkey'], capture_output=True).stdout.decode().strip() 19 | 20 | 21 | def pubkey(privkey): 22 | return subprocess.run(['wg', 'pubkey'], input=privkey.encode(), capture_output=True).stdout.decode().strip() 23 | 24 | 25 | def reg(key): 26 | url = 'https://api.cloudflareclient.com/v0a977/reg' 27 | headers = { 28 | 'User-Agent': 'okhttp/3.12.1', 29 | 'Content-Type': 'application/json; charset=UTF-8', 30 | } 31 | install_id = genstring(11) 32 | payload = { 33 | 'key': key, 34 | 'install_id': install_id, 35 | 'fcm_token': f'{install_id}:APA91b{genstring(134)}', 36 | 'referer': '1.1.1.1', 37 | 'warp_enabled': True, 38 | 'tos': datetime.datetime.now().strftime('%Y-%m-%dT%H:%M:%S+08:00'), 39 | 'model': 'Xiaomi POCO X2', 40 | 'type': 'Android', 41 | 'locale': 'en_US', 42 | } 43 | r = requests.post(url, headers=headers, data=json.dumps(payload)) 44 | return r.json() 45 | 46 | 47 | def main(): 48 | k = genkey() 49 | pk = pubkey(k) 50 | r = reg(pk) 51 | c = r['config'] 52 | 53 | print('[Interface]') 54 | print('PrivateKey =', k) 55 | print('# PublicKey =', pk) 56 | print('Address =', c['interface']['addresses']['v4']) 57 | print('Address =', c['interface']['addresses']['v6']) 58 | print('# ClientID =', list(base64.b64decode(c['client_id']))) 59 | print('# Table = off') 60 | print(''' 61 | [Peer] 62 | PublicKey = bmXOC+F1FxEMF9dyiK2H5/1SUtzH0JuVo51h2wPfgyo= 63 | # Endpoint = engage.cloudflareclient.com:2408 64 | Endpoint = 162.159.192.1:2408 65 | # Endpoint = [2606:4700:d0::a29f:c005]:2408 66 | AllowedIPs = 0.0.0.0/0 67 | AllowedIPs = ::/0''') 68 | 69 | 70 | if __name__ == '__main__': 71 | main() 72 | --------------------------------------------------------------------------------