TCP Option Address

The TCP Option Address (TOA) module is a kernel module that obtains the source IPv4 address from the option section of a TCP header.

此分支用于适配kylin v10 aarch64系统。

Motive

创建次分支的原因是官方版本在kylin v10 aarch64上编译失败(centos 7.x aarch64上同样编译失败)。

编译报错信息

对应的bug TOA arm64 编译报错 #9

#......
/root/toa/toa.c:104:5: error: implicit declaration of function ‘lookup_address’ [-Werror=implicit-function-declaration]
#......
/root/toa/toa.c:118:21: error: ‘_PAGE_RW’ undeclared (first use in this function)
if (pte->pte &~ _PAGE_RW) pte->pte |= _PAGE_RW;
#......

Solution

1. 更换了去除写保护的方法，将lookup_address换成了apply_to_page_range；
2. Kylin v10 sp1的kallsyms中没有暴露init_mm地址，增加了从/boot/System.map中解析地址的能力。

Tested os version

4.19.90-17.ky10.aarch64

Kylin-Server-10-SP1-Release-Build04-20200711-arm64

4.19.90-24.4.v2101.ky10.aarch64

Kylin-Server-10-SP2-Release-Build09-20210524-arm64

How to use the TOA module?

Requirement

The development environment for compiling the kernel module consists of:

• kernel headers and the module library
• the gcc compiler
• GNU Make tool

Installation

Download and decompress the source package:

https://github.com/Huawei/TCP_option_address/archive/master.zip

Enter the source code directory and compile the module:

cd src
make

Load the kernel module:

sudo insmod toa.ko

Distribution license

TOA is distributed under the terms of the GNU General Public License v2.0. The full terms and conditions of this license are detailed in the LICENSE file.