Re: [PATCH net-next v15 03/22] ovpn: add basic interface creation/destruction/management routines

On Wed, 11 Dec 2024 at 21:32, Antonio Quartulli antonio@openvpn.net wrote:

static int ovpn_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack) {

•   return -EOPNOTSUPP;
  

•   struct ovpn_priv *ovpn = netdev_priv(dev);
  

•   enum ovpn_mode mode = OVPN_MODE_P2P;
  

•   if (data && data[IFLA_OVPN_MODE]) {
  

•           mode = nla_get_u8(data[IFLA_OVPN_MODE]);
  

•           netdev_dbg(dev, "setting device mode: %u\n", mode);
  

•   }
  

•   ovpn->dev = dev;
  

•   ovpn->mode = mode;
  

•   /* turn carrier explicitly off after registration, this way state is
  

•    * clearly defined
  

•    */
  

•   netif_carrier_off(dev);
  

•   return register_netdevice(dev);
  

}

static struct rtnl_link_ops ovpn_link_ops = { .kind = "ovpn", .netns_refund = false,

•   .priv_size = sizeof(struct ovpn_priv),
  

•   .setup = ovpn_setup,
  

•   .policy = ovpn_policy,
  

•   .maxtype = IFLA_OVPN_MAX,
    .newlink = ovpn_newlink,
    .dellink = unregister_netdevice_queue,
  

};

You need to implement .fill_info to add IFLA_OVPN_MODE into get / dump ops.