linux-kernel - Re: [RFC] WireGuard: next generation secure network tunnel

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Message-ID: <CAHmME9opjoOYQBacomKBMXMPkch8fxSjFp1B_uoPFFmQeLh24g@mail.gmail.com>
Date:	Fri, 1 Jul 2016 16:25:18 +0200
From:	"Jason A. Donenfeld" <Jason@...c4.com>
To:	Richard Weinberger <richard.weinberger@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, linux-crypto@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] WireGuard: next generation secure network tunnel

Hi Richard,

On Fri, Jul 1, 2016 at 1:42 PM, Richard Weinberger
<richard.weinberger@...il.com> wrote:
> So every logical tunnel will allocate a new net device?
> Doesn't this scale badly? I have ipsec alike setups
> with many, many road warriors in mind.

No, this isn't the case. Each net device has multiple peers. Check out
the example config on the website, pasted here for convenience:

> [Interface]
> PrivateKey = yAnz5TF+lXXJte14tji3zlMNq+hd2rYUIgJBgB3fBmk=
> ListenPort = 41414
>
> [Peer]
> PublicKey = xTIBA5rboUvnH4htodjb6e697QjLERt1NAB4mZqp8Dg=
> AllowedIPs = 10.192.122.3/32, 10.192.124.1/24
>
> [Peer]
> PublicKey = TrMvSoP4jYQlY6RIzBgbssQqY3vxI2Pi+y71lOWWXX0=
> AllowedIPs = 10.192.122.4/32, 192.168.0.0/16
>
> [Peer]
> PublicKey = gN65BkIKy1eCE9pP1wdc8ROUtkHLF2PfAqYdyYBz6EA=
> AllowedIPs = 10.10.10.230/32

If that file is example.conf, you could set up a single device like this:

$ ip link add dev wg0 type wireguard
$ wg setconf wg0 example.conf

That single netdev is now configured to communicate with several peers.

I hope this clarifies things. Let me know if you have further questions.

Regards,
Jason