[34] calculate ip extension lenght based on version

[biandratti]

Pull Request Template

Description

Please include a summary of the change and which issue is fixed.
Please also include relevant motivation and context. List any dependencies that are required for this change.

Type of change:

Please select the appropriate tags in the PR if necessary.

Motivation

Keeping thing up-to-date

How has this been tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce, and the Operative System used.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• Select the appropriate tags in the PR if necessary.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 65.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 50.45%. Comparing base (b074733) to head (bc0da52).

Files with missing lines	Patch %	Lines
src/ip_options.rs	72.22%	5 Missing ⚠️
src/tcp_process.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   50.27%   50.45%   +0.18%     
==========================================
  Files          15       16       +1     
  Lines        1289     1308      +19     
==========================================
+ Hits          648      660      +12     
- Misses        641      648       +7     

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