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From:   Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date:   Wed, 3 Oct 2018 16:25:51 +0200
Message-ID: <CAKv+Gu-d07eqZTzh04dTtCjpnG-0fKsh7=k9BQYW_bx0Ju6gDw@mail.gmail.com>
Subject: Re: [PATCH net-next v6 23/23] net: WireGuard secure network tunnel
To:     "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Netdev <netdev@vger.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        David Miller <davem@davemloft.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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On 3 October 2018 at 16:13, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
> On 3 October 2018 at 16:12, Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>> Hi Ard,
>>
>> On Wed, Oct 3, 2018 at 1:15 PM Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
>>> > +config WIREGUARD
>>> > +       tristate "WireGuard secure network tunnel"
>>> > +       depends on NET && INET
>>>
>>> I think you need to add IPV6 here
>>
>> Nope. Like much of the net tree, WireGuard can function on ipv6-less
>> kernels. If you do find something in WireGuard isn't working in a
>> v6-less configuration, I consider that to be a bug that needs fixing.
>>
>
> OK. I hit a build error yesterday, and setting CONFIG_IPV6 fixed it.
> Let me see if I can reproduce.

I get

drivers/net/wireguard/socket.o: In function `send6':
socket.c:(.text+0x56c): undefined reference to `ipv6_chk_addr'
drivers/net/wireguard/socket.o: In function `wg_socket_send_skb_to_peer':
socket.c:(.text+0x904): undefined reference to `ipv6_chk_addr'
drivers/net/wireguard/socket.o: In function `wg_socket_init':
socket.c:(.text+0x161c): undefined reference to `ipv6_mod_enabled'

if I build my kernel with WireGuard built in but IPv6 support enabled
as a module.