test/libalias: Tests for outgoing NAT

[donner]

Summary

Testing LibAliasOut functionality. This concentrates the typical use case of initiating data transfers from the inside.

Provide a exhaustive test for the data structure in order to check for performance improvements

Test Plan

$ `make test`
2_natout:1_simplemasq  ->  passed  [0.003s]
2_natout:2_unregistered  ->  passed  [0.003s]
2_natout:3_cgn  ->  passed  [0.003s]
2_natout:4_udp  ->  passed  [0.003s]
2_natout:5_sameport  ->  passed  [0.003s]
2_natout:7_stress  ->  passed  [11.192s]

[donner]

• Simplify structure

[donner]

• More simplification.

[donner]

• Add UDP and reverse translation

[donner]

• Simplify structure
• More simplification.
• Add UDP and reverse translation
• Fix packet header size calculation

[kp]

tests/sys/netinet/libalias/2_natout.c

209

I'm not the only one who really enjoys that comment, right?

[donner]

I'm far from finished with this.
But thank you @kp for the intermediate, positive response.

[donner]

• Factor out common utilities
• Zeroize packet buffer

[donner]

• Fix stupid errors (reversed length check, existing nat state)

[donner]

• Fix case 4_udp and various issues

[donner]

• Test case for PKG_ALIAS_SAME_PORTS

[donner]

• Add test for PKT_ALIAS_RESET_ON_ADDR_CHANGE

[donner]

• Add stress test for exhausting of search data structure

[donner]

@kp may you have a look again?
Does this cover your common use cases, @lev ?

[lev]

In D30335#682251, @donner wrote:

Does this cover your common use cases, @lev ?

Big part of my use cases is port forwarding into DMZ, both TCP and UDP, with multiple (2000+) streams to same forward.

(it is M4 source, so SKYNET_NAT, SKYNET_IP and DMZ_HOST are macros which expand to simple IPv4 addresses).

nat SKYNET_NAT config ip SKYNET_IP same_ports redirect_port tcp DMZ_HOST:1688116881 redirect_port udp DMZ_HOST:1688116881 redirect_port tcp TORRENT_BOX4:18080 18080

These redirects process A LOT of traffic in MULTIPLE streams.

[donner]

In D30335#682354, @lev wrote:

In D30335#682251, @donner wrote:

Does this cover your common use cases, @lev ?

Big part of my use cases is port forwarding into DMZ, both TCP and UDP, with multiple (2000+) streams to same forward.

Okay, than you have to wait for the next part of the test suite "LibAliasIn".

[donner]

Thank you @kp, having this in main allows to test other branches more easily.