Hi Jakub, On Wed, Aug 24, 2022 at 05:18:30PM -0700, Jakub Kicinski wrote: > diff --git a/drivers/net/wireguard/netlink.c b/drivers/net/wireguard/netlink.c > index d0f3b6d7f408..0c0644e762e5 100644 > --- a/drivers/net/wireguard/netlink.c > +++ b/drivers/net/wireguard/netlink.c > @@ -621,6 +621,7 @@ static const struct genl_ops genl_ops[] = { > static struct genl_family genl_family __ro_after_init = { > .ops = genl_ops, > .n_ops = ARRAY_SIZE(genl_ops), > + .resv_start_op = WG_CMD_SET_DEVICE + 1, > .name = WG_GENL_NAME, > .version = WG_GENL_VERSION, > .maxattr = WGDEVICE_A_MAX, FWIW, I wouldn't object to just leaving this at zero. I don't know of any wireguard userspaces doing anything with the reserved header field. Jason