Compile boot.elf
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#Compile boot.elf code#
In the past, information about the packet's path would not be possible to obtain without direct kernel code modification or some serious restrictions. With this information, the developer could narrow down the scope of troubleshooting and solve the problem quickly with the use of the appropriate tools. It shows which functions processed the packet and for how long, where it was consumed or dropped, or if it went the wrong way, not intended by the network architecture. In this paper, the «system-wide network stack view» means a path of the network packet through Linux's networking stack. Though doing their job very well, they cannot provide a system-wide network stack view, which could help us solve non-obvious problems in complex network infrastructures. Most of the tools, being narrowly targeted on solving specific issues, do not help either. This is a long and tedious process, and it needs to be repeated for every problem over and over since, for each problem, possible sources of malfunction are new and need to be rechecked. Such problems are solved by excluding possible sources of malfunction one by one with different tools. But complexity of the system configuration will eventually lead to non-obvious relations between different parts of it and more difficult problems will appear. Most problems are solved in one of these steps. Check if the network interface is working and is configured right, look at the ARP and routing tables, firewall rules, packet filtering, and move on to check the high-level configurations.
![compile boot.elf compile boot.elf](http://www.frothersunite.com/files/rob/Desc/Freeass1.jpg)
One of them is to walk through the OSI stack: go all the way up from the link layer to upper ones checking the system to work correctly on each layer. There are a lot of ways to troubleshoot networking problems. These technologies are very powerful and feature-rich, but on the other hand, it also makes troubleshooting of such network systems much harder and more time-consuming. Include multiple physical devices and virtual interfaces, various network namespaces, firewall settings, routing tables, packet filtering, networking protocols, and so on.
#Compile boot.elf software#
Software and hardware solutions are becoming increasingly complex, which leads to an increasingly complex network infrastructure that lies at the basis of such solutions. Tracing Network Packets in the Linux Kernel using eBPF. Keywords: Linux kernel networking tracing eBPFįor citation: Kovalev M.G. In this paper, an approach to tracing the path of network packets in the Linux kernel using eBPF is described. This situation could be changed with the appearance of a new type of tools powered by the Linux kernel's eBPF technology, which provides a flexible and powerful way to run a userspace code inside the kernel. Usually, they are narrowly targeted on solving one problem and cannot show a system-wide network stack view, which could be helpful in finding the source of the malfunction.
![compile boot.elf compile boot.elf](https://balau82.files.wordpress.com/2010/04/u-boot.png)
Although there exist plenty of tools and software that helps to troubleshoot such problems, their functionality is limited by the API that Linux kernel provides.
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During the development and maintenance of complex network infrastructure for a big project, developers face a lot of problems. Kovalev, ORCID: 0000-0003-1050-052X St Petersburg State University, 7-9, Universitetskaya nab., St. Tracing Network Packets in the Linux Kernel