[$] Whither WireGuard?

It has been just over one full year since the WireGuard virtual privatenetwork implementation was reviewed here.WireGuard has advanced in a number of ways since that article was written;it has gained many happy users, has been endorsedby Linus Torvalds, and is now supported by tools like NetworkManager.There is one notable thing that has not happened, though: WireGuardhas not yet been merged into the mainline kernel. After a period ofsilence, WireGuard is back, and it would appear that the long process ofgetting upstream is nearly done.