T6442: CGNAT add log for address allocation

[sever-sever]

Add the configuration command to log the current CGNAT allocation.

set nat cgnat log-allocation

Change Summary

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T6442

Related PR(s)

Component(s) name

cgnat

Proposed changes

How to test

set nat cgnat log-allocation
set nat cgnat pool external ext-01 external-port-range '1024-65535'
set nat cgnat pool external ext-01 per-user-limit port '2000'
set nat cgnat pool external ext-01 range 192.168.122.222/32
set nat cgnat pool internal int-01 range '100.64.0.0/28'
set nat cgnat rule 10 source pool 'int-01'
set nat cgnat rule 10 translation pool 'ext-01'

Check logs:

Jun 10 14:10:02 r4 sudo[9057]:     vyos : TTY=pts/0 ; PWD=/home/vyos ; USER=root ; COMMAND=/usr/bin/sh -c ' /usr/libexec/vyos/conf_mode/nat_cgnat.py'
Jun 10 14:10:02 r4 sudo[9057]: pam_unix(sudo:session): session opened for user root(uid=0) by vyos(uid=1003)
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.0, external host: 192.168.122.222, Port range: 1024-3023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.1, external host: 192.168.122.222, Port range: 3024-5023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.2, external host: 192.168.122.222, Port range: 5024-7023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.3, external host: 192.168.122.222, Port range: 7024-9023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.4, external host: 192.168.122.222, Port range: 9024-11023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.5, external host: 192.168.122.222, Port range: 11024-13023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.6, external host: 192.168.122.222, Port range: 13024-15023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.7, external host: 192.168.122.222, Port range: 15024-17023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.8, external host: 192.168.122.222, Port range: 17024-19023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.9, external host: 192.168.122.222, Port range: 19024-21023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.10, external host: 192.168.122.222, Port range: 21024-23023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.11, external host: 192.168.122.222, Port range: 23024-25023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.12, external host: 192.168.122.222, Port range: 25024-27023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.13, external host: 192.168.122.222, Port range: 27024-29023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.14, external host: 192.168.122.222, Port range: 29024-31023
Jun 10 14:10:03 r4 cgnat[9059]: Internal host: 100.64.0.15, external host: 192.168.122.222, Port range: 31024-33023
Jun 10 14:10:03 r4 sudo[9057]: pam_unix(sudo:session): session closed for user root

Smoketest result

vyos@r4:~$ /usr/libexec/vyos/tests/smoke/cli/test_cgnat.py
test_cgnat (__main__.TestCGNAT.test_cgnat) ... 


ok
test_cgnat_sequence (__main__.TestCGNAT.test_cgnat_sequence) ... ok

----------------------------------------------------------------------
Ran 2 tests in 28.574s

OK
vyos@r4:~$ 

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

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