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+/*
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+ * Copyright (C) 2019 Michael Brown <mbrown@fensystems.co.uk>.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of the
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+ * License, or any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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+ * 02110-1301, USA.
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+ */
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+
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+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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+
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+#include <stddef.h>
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+#include <string.h>
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+#include <errno.h>
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+#include <ipxe/settings.h>
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+#include <ipxe/efi/efi.h>
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+#include <ipxe/efi/Protocol/DriverBinding.h>
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+#include <ipxe/efi/Protocol/LoadedImage.h>
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+#include <ipxe/efi/Protocol/ComponentName.h>
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+#include <ipxe/efi/efi_blacklist.h>
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+
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+/** @file
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+ *
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+ * EFI driver blacklist
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+ *
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+ */
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+
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+/** A blacklisted driver */
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+struct efi_blacklist {
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+ /** Name */
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+ const char *name;
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+ /**
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+ * Check if driver is blacklisted
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+ *
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+ * @v binding Driver binding protocol
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+ * @v loaded Loaded image protocol
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+ * @v wtf Component name protocol, if present
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+ * @ret blacklisted Driver is the blacklisted driver
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+ */
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+ int ( * blacklist ) ( EFI_DRIVER_BINDING_PROTOCOL *binding,
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+ EFI_LOADED_IMAGE_PROTOCOL *loaded,
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+ EFI_COMPONENT_NAME_PROTOCOL *wtf );
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+};
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+
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+/**
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+ * Blacklist Dell Ip4ConfigDxe driver
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+ *
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+ * @v binding Driver binding protocol
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+ * @v loaded Loaded image protocol
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+ * @v wtf Component name protocol, if present
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+ * @ret blacklisted Driver is the blacklisted driver
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+ */
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+static int
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+efi_blacklist_dell_ip4config ( EFI_DRIVER_BINDING_PROTOCOL *binding __unused,
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+ EFI_LOADED_IMAGE_PROTOCOL *loaded __unused,
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+ EFI_COMPONENT_NAME_PROTOCOL *wtf ) {
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+ static const CHAR16 ip4cfg[] = L"IP4 CONFIG Network Service Driver";
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+ static const char dell[] = "Dell Inc.";
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+ char manufacturer[ sizeof ( dell ) ];
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+ CHAR16 *name;
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+
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+ /* Check driver name */
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+ if ( ! wtf )
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+ return 0;
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+ if ( wtf->GetDriverName ( wtf, "eng", &name ) != 0 )
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+ return 0;
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+ if ( memcmp ( name, ip4cfg, sizeof ( ip4cfg ) ) != 0 )
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+ return 0;
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+
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+ /* Check manufacturer */
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+ fetch_string_setting ( NULL, &manufacturer_setting, manufacturer,
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+ sizeof ( manufacturer ) );
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+ if ( strcmp ( manufacturer, dell ) != 0 )
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+ return 0;
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+
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+ return 1;
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+}
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+
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+/** Blacklisted drivers */
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+static struct efi_blacklist efi_blacklists[] = {
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+ {
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+ .name = "Dell Ip4Config",
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+ .blacklist = efi_blacklist_dell_ip4config,
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+ },
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+};
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+
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+/**
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+ * Find driver blacklisting, if any
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+ *
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+ * @v driver Driver binding handle
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+ * @ret blacklist Driver blacklisting, or NULL
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+ * @ret rc Return status code
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+ */
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+static int efi_blacklist ( EFI_HANDLE driver,
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+ struct efi_blacklist **blacklist ) {
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+ EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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+ union {
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+ EFI_DRIVER_BINDING_PROTOCOL *binding;
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+ void *interface;
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+ } binding;
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+ union {
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+ EFI_LOADED_IMAGE_PROTOCOL *loaded;
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+ void *interface;
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+ } loaded;
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+ union {
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+ EFI_COMPONENT_NAME_PROTOCOL *wtf;
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+ void *interface;
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+ } wtf;
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+ unsigned int i;
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+ EFI_HANDLE image;
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+ EFI_STATUS efirc;
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+ int rc;
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+
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+ DBGC2 ( &efi_blacklists, "EFIBL checking %s\n",
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+ efi_handle_name ( driver ) );
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+
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+ /* Mark as not blacklisted */
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+ *blacklist = NULL;
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+
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+ /* Open driver binding protocol */
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+ if ( ( efirc = bs->OpenProtocol (
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+ driver, &efi_driver_binding_protocol_guid,
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+ &binding.interface, efi_image_handle, driver,
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+ EFI_OPEN_PROTOCOL_GET_PROTOCOL ) ) != 0 ) {
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+ rc = -EEFI ( efirc );
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+ DBGC ( driver, "EFIBL %s could not open driver binding "
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+ "protocol: %s\n", efi_handle_name ( driver ),
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+ strerror ( rc ) );
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+ goto err_binding;
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+ }
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+ image = binding.binding->ImageHandle;
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+
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+ /* Open loaded image protocol */
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+ if ( ( efirc = bs->OpenProtocol (
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+ image, &efi_loaded_image_protocol_guid,
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+ &loaded.interface, efi_image_handle, image,
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+ EFI_OPEN_PROTOCOL_GET_PROTOCOL ) ) != 0 ) {
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+ rc = -EEFI ( efirc );
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+ DBGC ( driver, "EFIBL %s could not open",
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+ efi_handle_name ( driver ) );
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+ DBGC ( driver, " %s loaded image protocol: %s\n",
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+ efi_handle_name ( image ), strerror ( rc ) );
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+ goto err_loaded;
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+ }
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+
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+ /* Open component name protocol, if present*/
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+ if ( ( efirc = bs->OpenProtocol (
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+ driver, &efi_component_name_protocol_guid,
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+ &wtf.interface, efi_image_handle, driver,
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+ EFI_OPEN_PROTOCOL_GET_PROTOCOL ) ) != 0 ) {
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+ /* Ignore failure; is not required to be present */
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+ wtf.interface = NULL;
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+ }
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+
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+ /* Check blacklistings */
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+ for ( i = 0 ; i < ( sizeof ( efi_blacklists ) /
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+ sizeof ( efi_blacklists[0] ) ) ; i++ ) {
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+ if ( efi_blacklists[i].blacklist ( binding.binding,
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+ loaded.loaded, wtf.wtf ) ) {
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+ *blacklist = &efi_blacklists[i];
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+ break;
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+ }
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+ }
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+
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+ /* Success */
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+ rc = 0;
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+
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+ /* Close protocols */
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+ if ( wtf.wtf ) {
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+ bs->CloseProtocol ( driver, &efi_component_name_protocol_guid,
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+ efi_image_handle, driver );
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+ }
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+ bs->CloseProtocol ( image, &efi_loaded_image_protocol_guid,
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+ efi_image_handle, image );
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+ err_loaded:
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+ bs->CloseProtocol ( driver, &efi_driver_binding_protocol_guid,
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+ efi_image_handle, driver );
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+ err_binding:
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+ return rc;
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+}
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+
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+/**
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+ * Unload any blacklisted drivers
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+ *
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+ */
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+void efi_unload_blacklist ( void ) {
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+ EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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+ struct efi_blacklist *blacklist;
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+ EFI_HANDLE *drivers;
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+ EFI_HANDLE driver;
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+ UINTN num_drivers;
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+ unsigned int i;
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+ EFI_STATUS efirc;
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+ int rc;
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+
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+ /* Locate all driver binding protocol handles */
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+ if ( ( efirc = bs->LocateHandleBuffer (
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+ ByProtocol, &efi_driver_binding_protocol_guid,
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+ NULL, &num_drivers, &drivers ) ) != 0 ) {
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+ rc = -EEFI ( efirc );
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+ DBGC ( &efi_blacklists, "EFIBL could not list all drivers: "
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+ "%s\n", strerror ( rc ) );
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+ return;
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+ }
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+
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+ /* Unload any blacklisted drivers */
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+ for ( i = 0 ; i < num_drivers ; i++ ) {
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+ driver = drivers[i];
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+ if ( ( rc = efi_blacklist ( driver, &blacklist ) ) != 0 ) {
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+ DBGC ( driver, "EFIBL could not determine "
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+ "blacklisting for %s: %s\n",
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+ efi_handle_name ( driver ), strerror ( rc ) );
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+ continue;
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+ }
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+ if ( ! blacklist )
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+ continue;
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+ DBGC ( driver, "EFIBL unloading %s (%s)\n",
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+ efi_handle_name ( driver ), blacklist->name );
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+ if ( ( efirc = bs->UnloadImage ( driver ) ) != 0 ) {
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+ DBGC ( driver, "EFIBL could not unload %s: %s\n",
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+ efi_handle_name ( driver ), strerror ( rc ) );
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+ }
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+ }
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+
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+ /* Free handle list */
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+ bs->FreePool ( drivers );
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+}
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