HOMECOURSESSTUDENTSDONATIONSVIDEOSEVENTSTUTORIALSLINKSNEWSCONTACT


VIDEOS 》 Linux Kernel struct tcphdr data-structure

Refer: Kernel Doc printk-formats.txt - http://elixir.free-electrons.com/linux/latest/source/Documentation/printk-formats.txt

Here is the screenshot of my Sample Example Code discussed in the video above:
Screenshot
Screenshot

Refer:
struct tcphdr data-structure - http://elixir.free-electrons.com/linux/latest/source/include/uapi/linux/tcp.h#L24
sk_buff to tcphdr APIs - http://elixir.free-electrons.com/linux/latest/source/include/linux/tcp.h
Definitions for the TCP module - http://elixir.free-electrons.com/linux/latest/source/include/net/tcp.h

And here is the copy paste of struct tcp data-structure (/include/uapi/linux/tcp.h) from the Kernel-source version 4.13 for quick reference:

struct tcphdr {
	__be16	source;
	__be16	dest;
	__be32	seq;
	__be32	ack_seq;
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u16	res1:4,
		doff:4,
		fin:1,
		syn:1,
		rst:1,
		psh:1,
		ack:1,
		urg:1,
		ece:1,
		cwr:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u16	doff:4,
		res1:4,
		cwr:1,
		ece:1,
		urg:1,
		ack:1,
		psh:1,
		rst:1,
		syn:1,
		fin:1;
#else
#error	"Adjust your  defines"
#endif	
	__be16	window;
	__sum16	check;
	__be16	urg_ptr;
};



Suggested Topics:


Video Episodes :: Linux Kernel programming

Linux Kernel - Containers and Namespaces ↗
Saturday' 13-Mar-2021

Linux Kernel Architecture ↗
Saturday' 13-Mar-2021

Linux Kernel Compilation ↗
Saturday' 13-Mar-2021

Linux ioctl() API interface ↗
Saturday' 13-Mar-2021
Watch detailed videos and read topics on Linux Kernel Programming and Linux ioctl() API interface

Linux Kernel Programming ↗
Saturday' 13-Mar-2021

Linux Operating System - User-space Processes ↗
Saturday' 13-Mar-2021

Linux Kernel /proc Interface ↗
Saturday' 13-Mar-2021

Linux Kernel Programming - Device Drivers ↗
Saturday' 13-Mar-2021
Watch detailed videos and read topics on Linux Kernel Programming - Device Drivers

Linux Kernel FileSystems Subsystem ↗
Saturday' 13-Mar-2021

Join The Linux Channel :: Facebook Group ↗

Visit The Linux Channel :: on Youtube ↗


💗 Help shape the future: Sponsor/Donate


Recommended Topics:
Featured Video:
Watch on Youtube - x22f Linux Kernel Network Drivers - Classification ↗

Raspberry Pi OS with PIXEL ↗
Saturday' 13-Mar-2021

Programming Language Performance and Overheads ↗
Saturday' 13-Mar-2021
A detailed Youtube video series of various programming language performance and overheads - a big picture

What is a Linux Kernel Module - a Big Picture ↗
Saturday' 13-Mar-2021
Learning Linux Kernel Programming is always fascinating and yet challenging. So generally you may tend to learn Kernel Module programming, since such a module can be dynamically plugged into running Linux Kernel. But this will lead to confusion, and many assume kernel source is mostly a collection of these modules. Which in reality is not. Not just that, when we say Kernel Module, its a vaguely defined term. The term Module (as we know) is nothing but a collection of APIs, bunch of variables and associated data-structures. Which may or may not be a plugable kernel module. If you ask me, I am a fan of wiring Linux Kernel Modules, which may not be necessarily a pluggable kernel module. It all boils down to the address space at which these modules function inside a monolithic Linux Kernel. Which is nothing but Linux Kernel's address space. Hence here is my detailed multi-episode Youtube video series on Linux Kernel modules, a big picture and the significance of the

Linux Kernel Programming | with or without Kernel Modules | Device Drivers ↗
Saturday' 13-Mar-2021
When learning Linux Kernel programming, often I notice my students and viewers gets confused and they start with learning writing Linux Kernel modules. And so they develop the common misconception about Kernel Programming in general. They assume writing code in Linux Kernel means writing kernel modules. Which is absolutely not. Kernel modules are an optional choice and are part of Linux Kernel. But besides modules, Linux Kernel has lot of other mainstream code. Hence if anyone wants to be a Kernel Developer, you should be aware that sometimes you add new code via modules, sometimes without them. And if you ask me, I am not much in favor of writing Kernel modules. Instead in my code, I try to integrate and make them a part of Linux Kernel so that they all get initialized during boot time. Here is an extensive Youtube video of mine on Linux Kernel Programming, with and without Kernel Modules.

Weekly News Digest - Week 03 - June 2020 ↗
Saturday' 13-Mar-2021
The Linux Channel :: Weekly News Digest - Week 03 - June 2020 > KimĪ‡ Micro: A powerful alternative to the Raspberry Pi that supports PCIe cards > Linux Lands And Then Reverts Usage Of Flexible Array Members > AMD Ryzen 4000-Powered Asus Mini PC Challenges Intel's NUC > Aaeon's Raspberry Pi-like Board Bears An Intel 8th Gen Core i7 CPU and 16GB of DDR4 > Linus Torvalds Announces Massive Linux Kernel 5.8 Update > New Cisco Cloud Scale ASIC & 400G Line Card Announced > Key Differences of PoE vs PoE+ vs PoE++ Switches a STH Guide

CEO, CTO Talk ↗
Saturday' 13-Mar-2021

TCP vs UDP an Expert Opinion ↗
Saturday' 13-Mar-2021

Weekly News Digest - Week 5 - February 2018 ↗
Saturday' 13-Mar-2021
> Mini-ITX board fosters flexibility and fights obsolescence > You Can Do Better Than Arduino: Try These Microcontrollers > Open source is 20: How it changed programming and business forever > Since computer technology evolves so rapidly, does it matter if you have 5 or 15 years of experience as e.g. software developer? > Linux Kernel net_device data-structure - possible_net_t nd_net - Network namespace and Linux Containers - Ep7 > New Wave of Mini Satellites Could Boost Climate Research > Here come all the AI deployments; Now how do we manage AI? > Imagination announces neural network acceleration push

How to start Open-Source Project ↗
Saturday' 13-Mar-2021

Weekly News Digest - Week 8 - February 2018 ↗
Saturday' 13-Mar-2021
> Asymmetric Processor Cores > Using QCT Quanta LB6M 10GbE Switch for Container Networking > Using SSE Instead Of WebSockets For Unidirectional Data Flow Over HTTP/2 > Why IPv6 networks create DNS configuration problems > Hypervisor or containers: Which solution is right for you? > Blockchain for 2018 and Beyond: A (growing) list of blockchain use cases > Raw sockets backdoor gives attackers complete control of some Linux servers


Trending Video:
Watch on Youtube - 352 Linux user-space - Shared Memory IPC - Live Demo and Exa ↗

MySQL database server installation ↗
Saturday' 13-Mar-2021



Recommended Video:
Watch on Youtube - 352 Linux user-space - Shared Memory IPC - Live Demo and Exa ↗