nl_ctx_alloc
ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_GET);
ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_SWAP);
ctx = nl_ctx_alloc(ovpn, OVPN_CMD_PEER_NEW);
ctx = nl_ctx_alloc(ovpn, OVPN_CMD_PEER_SET);
ctx = nl_ctx_alloc(ovpn, OVPN_CMD_PEER_DEL);
ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_NEW);
ctx = nl_ctx_alloc(ovpn, OVPN_CMD_KEY_DEL);