linux内核中UDP包的路径 [英] Path of UDP packet in linux kernel

问题描述

我想在Linux内核中找到一个UDP数据包的路径.为此，我想阅读一些文档(我有 this 到目前为止，这是针对 TCP 的)，然后在相关的内核函数中有一些 printk 语句来确认.我将通过重新编译内核代码来做到这一点.

I want to find the path of a UDP packet in the Linux kernel. For this, I want to read up on some documentation ( I have this so far, which is for TCP) and then have some printk statements in the relevant kernel functions to confirm that. I will do this by recompiling the kernel code.

这是解决问题的方法吗?您有什么建议/参考吗?

Is this the way to go about it? Do you have any suggestions/references?

推荐答案

Linux 网络堆栈是内核的一大块，您需要花一些时间来研究它.我认为这本书可能会有所帮助(侧重于较旧的内核 2.4 和 2.6，但最新内核 3.x 的逻辑保持不变):

The linux networking stack is a big piece of the kernel and you need to spend some time studying it. I think that this books may help (Focused on older kernels 2.4 and 2.6, but the logic remain the same for the latest kernels 3.x):

了解 Linux 网络内部结构

Linux 网络架构 - 网络协议的设计和实现在 Linux 内核中

您也可以查看此链接:

http://e-university.wisdomjobs.com/linux/chapter-189-277/sending-the-data-from-the-socket-through-udp-and-tcp.html

http://www.linuxfoundation.org/collaborate/workgroups/networking/kernel_flow

http://wiki.openwrt.org/doc/networking/praxis

http://www.ibm.com/developerworks/linux/library/l-linux-networking-stack/?ca=dgr-lnxw01lnxNetStack

http://gicl.cs.drexel.edu/people/sevy/network/Linux_network_stack_walkthrough.html

您还需要浏览内核源代码:

You need also to browse the kernel source :

http://lxr.linux.no/#linux+v3.7.3/

使用此功能开始您的网络子系统之路:ip_rcv收到.然后调用其他函数(ip_rcv_finish、ip_local_deliver 和ip_local_deliver_finish=> 这个函数负责选择好的传输层)

Begin your road to the network sub-system with this function : ip_rcv which is called when a packet is received. other functions are then called (ip_rcv_finish, ip_local_deliver and ip_local_deliver_finish=> This function is responsible for choosing the good transport layer)

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