KLALB V3.4

2025-11-15 11:08:16 +08:00
parent 306bfd36f7
commit 8842566ee2
160 changed files with 18540 additions and 4512 deletions
@@ -0,0 +1,69 @@
+package org.kne.cloud.network.ipv6;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import org.kne.cloud.network.NetworkPacket;
+import org.kne.io.KNEChannels;
+
+public class ICMPv6TimeExceededPacket extends ICMPv6Packet {
+    private static final int UNUSED_FIELD_LENGTH = 4; // 未使用字段长度
+    
+    // 代码值常量
+    public static final int CODE_HOP_LIMIT_EXCEEDED = 0;      // 跳数限制超时
+    public static final int CODE_FRAGMENT_REASSEMBLY_EXCEEDED = 1; // 分片重组超时
+    
+    public ICMPv6TimeExceededPacket(int code) {
+        super(TYPE_TIME_EXCEEDED, code);
+        setUnused(0);
+    }
+    
+    /**
+     * 获取未使用字段（通常为0）
+     */
+    public int getUnused() {
+        return getHeader().getInt(4);
+    }
+    
+    /**
+     * 设置未使用字段（通常设为0）
+     */
+    public void setUnused(int unused) {
+    	getHeader().putInt(4, unused);
+    }
+    
+    
+    /**
+     * 创建跳数限制超时包
+     */
+    public static ICMPv6TimeExceededPacket createHopLimitExceeded(IPv6Packet originalPacket) {
+        ICMPv6TimeExceededPacket packet = new ICMPv6TimeExceededPacket(CODE_HOP_LIMIT_EXCEEDED);
+        
+        // 包含原始数据包的前缀（根据RFC，尽可能包含但不超出最小MTU）
+        if (originalPacket == null) {
+        	throw new NullPointerException("originalPacket is null!");
+        }
+            // 这里简化处理，实际应该序列化原始包的前1280字节（IPv6最小MTU）
+            ByteBuffer buffer = NetworkPacket.bufferAllocator.allocate(65536);
+            buffer.clear();
+            try {
+				originalPacket.writeToChannel(KNEChannels.newWritableChannel(buffer));
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+            buffer.flip();
+            buffer.limit(Math.min(1280, buffer.limit()));
+            packet.getData().clear();
+            packet.getData().put(buffer);
+            packet.getData().flip();
+        return packet;
+    }
+    
+    @Override
+    public String toString() {
+        String codeStr = getCode() == CODE_HOP_LIMIT_EXCEEDED ? 
+                        "Hop Limit Exceeded" : "Fragment Reassembly Time Exceeded";
+        return String.format("ICMPv6 Time Exceeded [%s, OriginalPrefix:%d bytes]", 
+                           codeStr, getDataLength());
+    }
+}