drop-fragmented-ndisc-packets-assembled-in-netfilter

### 环境信息 【OS版本】openEuler-20.03-LTS-SP4 【内核版本】4.19.90-2506.4.0.0333 【硬件平台】无关 【组网信息】无关 ### 缺陷信息 **【问题复现步骤】**： 在测试IPv6协议一致性时，发现内核存在两个IPv6协议一致性问题 **问题** 错误响应带有分片扩展头的ND报文 - 下图是一个NS报文，携带了分片扩展头，不符合RFC6980规范，设备收到此类报文应该静默丢弃，但是内核回复了该报文并且学习到了对端的地址。(此处仅展示了NS报文，若是NA报文携带了分片扩展头，内核处理同样有此问题。) - 下图是TAHI测试套件给出的信息：  - 查看内核提交记录，在5.10.y版本里面找到了对应修复记录，以下是commit链接： - https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=68f9f9c2c3b6a7259f6a92bc26cdc7bd22e7a982 问题报文原文如上图，TAHI测试套件对应用例脚本： TAHI测试套件对应用例脚本： // // Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 // Yokogawa Electric Corporation. // All rights reserved. // // Redistribution and use of this software in source and binary // forms, with or without modification, are permitted provided that // the following conditions and disclaimer are agreed and accepted // by the user: // // 1. Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright // notice, this list of conditions and the following disclaimer in // the documentation and/or other materials provided with // the distribution. // // 3. Neither the names of the copyrighters, the name of the project // which is related to this software (hereinafter referred to as // "project") nor the names of the contributors may be used to // endorse or promote products derived from this software without // specific prior written permission. // // 4. No merchantable use may be permitted without prior written // notification to the copyrighters. // // 5. The copyrighters, the project and the contributors may prohibit // the use of this software at a…