Feature: add linux network namespace support for wireguard

[suzakuwcx]

Wireguard document here

So I add a new configure option 'WGNamespace', if exist, the wireguard will be moved into the sub interface

Here is my test environment, built by GNS3, with archlinux qemu vm, base-1 and base-2 are peers

Configure origin

Configure with 'WGNamespace=subnet'

[joukewitteveen]

At first glance this looks excellent, thanks! I'll read up on network namespaces and will come back with a proper review later.

[endreszabo]

this is how I do it with the classic wg-quick tool:

[Interface]
PrivateKey = ...
ListenPort = ...
Table      = off
MTU        = 1400
PostUp     = ip link set atvie0_ntf01_v4 netns s2s
PostUp     = ip netns exec s2s ip -4 addr add 100.64.2.50/30 dev atvie0_ntf01_v4
PostUp     = ip netns exec s2s ip -6 addr add fd4d:4045:e5e9:8c::2/64 dev atvie0_ntf01_v4
PostUp     = ip netns exec s2s ip link set atvie0_ntf01_v4 up