| 413 | } |
| 414 | |
| 415 | handleARP(packet) { |
| 416 | // Simple ARP Reply |
| 417 | // Hardware Type (2), Protocol (2), HLen (1), PLen (1), Op (2) |
| 418 | const op = packet.readUInt16BE(6); |
| 419 | if (op === 1) { // Request |
| 420 | // Target IP |
| 421 | const targetIP = packet.subarray(24, 28); |
| 422 | const targetIPStr = targetIP.join('.'); |
| 423 | |
| 424 | if (targetIPStr === this.gatewayIP) { |
| 425 | // Reply |
| 426 | const reply = Buffer.alloc(28); |
| 427 | packet.copy(reply, 0, 0, 8); // Copy HW/Proto/Len |
| 428 | reply.writeUInt16BE(2, 6); // Reply Op |
| 429 | |
| 430 | this.gatewayMac.copy(reply, 8); // Sender HW |
| 431 | targetIP.copy(reply, 14); // Sender IP (Gateway) |
| 432 | |
| 433 | packet.subarray(8, 14).copy(reply, 18); // Target HW (VM) |
| 434 | packet.subarray(14, 18).copy(reply, 24); // Target IP (VM) |
| 435 | |
| 436 | this.send(reply, ETH_P_ARP); |
| 437 | } |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | handleIP(packet) { |
| 442 | const version = packet[0] >> 4; |