T7283: VPP add static NAT support

[natali-rs1985]

Add static mapping NAT implementation

set vpp nat44 static rule 10 outbound-interface 'eth0'
set vpp nat44 static rule 10 inbound-interface 'eth1'
set vpp nat44 static rule 10 destination address 192.168.122.10    # optional, if not set outbound interface ip address is used
set vpp nat44 static rule 10 destination port 6545                 # optional
set vpp nat44 static rule 10 protocol tcp|udp|icmp|all             # optional, defaults to "all"
set vpp nat44 static rule 10 translation address 100.64.0.10
set vpp nat44 static rule 10 translation port 64010                # optional

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)
• Other (please describe):

Related Task(s)

• https://vyos.dev/T7283

Related PR(s)

Proposed changes

How to test

set interfaces ethernet eth0 address '192.168.122.210/24'
set interfaces ethernet eth1 address '100.64.0.1/24'

set vpp settings interface eth0 driver 'dpdk'
set vpp settings interface eth1 driver 'dpdk'
set vpp settings interface eth2 driver 'dpdk'
set vpp settings lcp ignore-kernel-routes
set vpp settings unix poll-sleep-usec '122'

set vpp nat44 static rule 10 destination address '192.168.122.54'
set vpp nat44 static rule 10 outbound-interface 'eth0'
set vpp nat44 static rule 10 translation address '100.64.0.10'

Check VPP NAT44

vyos@vyos:~$ show vpp nat44 static
Des_address/interface    Dest_port    Trans_address    Trans_port    Protocol
-----------------------  -----------  ---------------  ------------  ----------
192.168.122.54                        100.64.0.10                    all
vyos@vyos:~$ show vpp nat44 sessions
NAT44 ED sessions:
-------- thread 0 vpp_main: 1 sessions --------
    i2o 100.64.0.10 proto ICMP port 6440 fib 0
    o2i 192.168.122.54 proto ICMP port 6440 fib 0
       external host 8.8.8.8:6440
       i2o flow: match: saddr 100.64.0.10 sport 6440 daddr 8.8.8.8 dport 6440 proto ICMP fib_idx 0 rewrite: saddr 192.168.122.54 daddr 8.8.8.8 icmp-id 6440 txfib 0
       o2i flow: match: saddr 8.8.8.8 sport 6440 daddr 192.168.122.54 dport 6440 proto ICMP fib_idx 0 rewrite: saddr 8.8.8.8 daddr 100.64.0.10 icmp-id 6440 txfib 0
       index 0
       last heard 138.04
       timeout in 59.96
       total pkts 266, total bytes 24206
       static translation

vyos@vyos:~$ show vpp nat44 summary
max translations per thread: 64512 fib 0
icmp LRU min session timeout 1129 (now 1070)
total sessions: 1 (timed out: 0)
tcp sessions:
    total: 0 (timed out: 0)
        established: 0 (timed out: 0)
        transitory: 0 (timed out: 0)
udp sessions:
    total: 0 (timed out: 0)
icmp sessions:
    total: 1 (timed out: 0)
other sessions:
    total: 0 (timed out: 0)

Checklist:

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

[zdc]

Just an idea: should we keep this and this together?

[natali-rs1985]

Put them together in the control_vpp.py

[dmbaturin]

This should be a constant. If there are issues with constants in the VPP module, we can just add it at the top of the script. Magic numbers are easy to forget, and we never know if VPP may change them.