On Wed, Oct 3, 2018 at 4:25 PM Ard Biesheuvel [off-list ref] wrote:

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On Wed, Oct 3, 2018 at 1:15 PM Ard Biesheuvel [off-list ref] wrote:

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+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.

Nice catch. Looks like the norm is adding "depends on IPV6 || !IPV6"
or the like. I'll play and make sure this works for v7. Thanks for
pointing it out.

Jason