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Videos :: Linux Kernel struct tcphdr data-structure

Written by: Kiran Kankipati - Published: 05-Jul-2016

 

Linux Kernel struct tcphdr data-structure - part2 - Sample Example Code

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

Linux Kernel struct tcphdr data-structure - part1 - code walk, Example

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;
};



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