Add initial support for wireguard provider in userspace

[soffokl]

[Snawoot]

As far as I know we use automatic switching between in-kernel (wg module) and userspace (TUN) implementation. Should we also use such autoswitching via probing for full userspace impl. as well?

[soffokl]

@Snawoot sure, but there are many missing parts now like protection for accessing LAN. I want to keep it as an extra flag for now.

[Zensey]

For some next revision I'd suggest to add packet source adress matching, so that unwanted packages could be dropped.

Example: https://github.com/xjasonlyu/tun2socks/blob/1536735456ae36fe3c9f1455bb4fe8fb10d77bc9/tunnel/udp.go#L120

[Donatas-MN]

Missing parts:

• Protection for accessing LAN
• Traffic shaping for bandwidth limit

[codecov-commenter]

Codecov Report

Merging #5186 (c583ab5) into master (fd6e5e5) will decrease coverage by 0.01%. The diff coverage is 0.00%.

:exclamation: Current head c583ab5 differs from pull request most recent head 43decff. Consider uploading reports for the commit 43decff to get more accurate results

@@            Coverage Diff             @@
##           master    #5186      +/-   ##
==========================================
- Coverage   38.55%   38.53%   -0.02%     
==========================================
  Files         358      359       +1     
  Lines       19563    19544      -19     
==========================================
- Hits         7542     7531      -11     
+ Misses      11287    11279       -8     
  Partials      734      734              

Impacted Files	Coverage Δ
config/flags_node.go	9.09% <0.00%> (-0.16%)	:arrow_down:
dns/sytemcfg_unix.go	0.00% <ø> (ø)
nat/factory_linux.go	0.00% <0.00%> (ø)
nat/service_iptables.go	0.00% <0.00%> (ø)
nat/service_noop.go	0.00% <0.00%> (ø)
router/router_desktop.go	56.43% <0.00%> (ø)
services/wireguard/service/service.go	20.64% <0.00%> (ø)
services/wireguard/wgcfg/device_config.go	86.53% <ø> (ø)
requests/dialer_swarm.go	72.18% <0.00%> (-6.77%)	:arrow_down:
session/pingpong/consumer_balance_tracker.go	56.63% <0.00%> (-1.43%)	:arrow_down:
... and 6 more

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[Zensey]

Switching to new gvisor version introduced leak of go-routine: github.com/mysteriumnetwork/node/services/wireguard/endpoint/netstack-provider.(*netTun).proxy

But adding defer dst.Close() seems to solve the problem

[Zensey]

It looks like now its ready to be merged

[Snawoot]

Congrats!