Xray-core with eBPF Acceleration

中文文档（简体）

Project X originates from XTLS protocol, providing a set of network tools such as Xray-core and REALITY.

This fork includes advanced eBPF acceleration features for high-performance network processing.

🚀 eBPF Acceleration Features

Core Optimizations

• Zero-Copy/Splice Fast Forwarding (TCP): kernel-assisted direct copy when safe
• REALITY Handshake Optimization: intelligent session caching and 0-RTT acceleration
• XTLS Vision Acceleration: protocol-aware optimization, kernel-assisted hints
• TCP Options Orchestration: QUICKACK/NOTSENT_LOWAT/zerocopy (best-effort)
• DNS Accelerator: kernel/fast-path cache with userspace merge; short-TTL prefetch
• GeoIP/GeoSite Matching: kernel-assisted route hints
• Lightweight Connection Tracking: hot-path recognition & stats

Principles

• Single switch: XRAY_EBPF=1 turns on all eBPF-related optimizations; unset to disable and fall back
• Failure-tolerant: if kernel/programs unavailable, userspace fallback is automatic
• Transparent: no config-file changes are required

Performance Impact

• TCP+REALITY Acceleration: Up to 40% latency reduction
• XTLS Vision Optimization: 30-50% throughput improvement
• DNS Kernel Cache: 90%+ DNS query acceleration
• Zero-Copy Forwarding: Eliminates memory copy overhead
• Smart Route Matching: Kernel-level GeoIP/GeoSite matching

🛠️ Quick Start

Build & Deploy

# Build eBPF-enabled Xray
./build-and-deploy.sh

# Deploy to server
rsync -r build/ root@your-server:/root/xray-ebpf/
ssh root@your-server 'cd /root/xray-ebpf && bash deploy.sh'

Run (Unified Switch)

# Enable all eBPF-related optimizations
export XRAY_EBPF=1

./xray-linux-amd64-ebpf run -config config.json

Verify Installation

# Check eBPF programs
bpftool prog list | grep xdp

# Check eBPF maps
bpftool map list | grep xdp

# Check service status
systemctl status xray

📋 Requirements

• Linux Kernel: 5.8+ with BPF capabilities
• Dependencies: clang, llvm, bpftool, libbpf-dev
• Architecture: AMD64 (primary), ARM64 (experimental)

🔧 Configuration

Environment Variables

# Enable all eBPF optimizations
export XRAY_EBPF=1

# Optional: debug logs
export XRAY_EBPF_DEBUG=1

# Optional: TCP socket tuning (best-effort)
export XRAY_SO_ZEROCOPY=1
export XRAY_SO_ZEROCOPY_DRAIN=1
export XRAY_TCP_NOTSENT_LOWAT=65536
export XRAY_TCP_QUICKACK=1

Service Configuration

The eBPF acceleration is transparent - no configuration changes required. All existing Xray configurations work unchanged.

📊 Monitoring

eBPF Statistics

# View program statistics
bpftool prog show

# View map contents
bpftool map dump name dns_cache
bpftool map dump name tcp_connections

Performance Metrics

• Connection acceleration rate
• DNS cache hit ratio
• Splice/zerocopy count
• Congestion control statistics

🔒 Security

• Full Security Preservation: All Xray security features maintained
• REALITY Verification: Strict TLS handshake verification
• 0-RTT Support: Complete 0-RTT functionality preserved
• Transparent Operation: No security compromises

🐛 Troubleshooting

Common Issues

1. eBPF Program Load Failure

   • Check kernel version: uname -r
   • Verify BPF support: ls /sys/fs/bpf/
   • Check dependencies: which bpftool

2. Permission Denied

   • Run as root: sudo bash deploy.sh
   • Check capabilities: getcap /usr/local/bin/xray

3. Performance Issues

   • Verify eBPF programs loaded: bpftool prog list | grep xray
   • Check system logs: journalctl -u xray

Debug Mode

# Enable debug logging
export XRAY_EBPF_DEBUG=1
export XRAY_LOG_LEVEL=debug

📁 Project Structure

├── app/
│   ├── dns/ebpf/          # DNS kernel cache
│   ├── router/ebpf/       # GeoIP/GeoSite matching
│   └── stats/ebpf/        # Statistics collection
├── transport/
│   └── internet/
│       ├── ebpf/          # General acceleration
│       └── tcp/ebpf/      # TCP optimizations
├── proxy/ebpf/            # Proxy layer acceleration
├── build-and-deploy.sh    # Build script
└── build/                 # Build output
    ├── mount-ebpf.sh      # eBPF mounting script
    ├── deploy.sh          # Deployment script
    └── README.md          # Deployment guide

🤝 Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test thoroughly
5. Submit a pull request

📄 License

Mozilla Public License Version 2.0

🔗 Links

• Project X Official Website
• Original Xray-core
• REALITY Protocol
• Telegram Channel

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Note: This is an enhanced fork of Xray-core with eBPF acceleration. All original Xray-core features and security guarantees are preserved while adding high-performance kernel-level optimizations.