diff options
| -rw-r--r-- | src/interface/efi/efi_autoexec.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/src/interface/efi/efi_autoexec.c b/src/interface/efi/efi_autoexec.c index 881c30c7e..79d4a4caf 100644 --- a/src/interface/efi/efi_autoexec.c +++ b/src/interface/efi/efi_autoexec.c @@ -24,11 +24,14 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <string.h> +#include <stdlib.h> #include <errno.h> #include <ipxe/image.h> #include <ipxe/init.h> +#include <ipxe/in.h> #include <ipxe/efi/efi.h> #include <ipxe/efi/efi_autoexec.h> +#include <ipxe/efi/Protocol/PxeBaseCode.h> #include <ipxe/efi/Protocol/SimpleFileSystem.h> #include <ipxe/efi/Guid/FileInfo.h> @@ -170,6 +173,175 @@ static int efi_autoexec_filesystem ( EFI_HANDLE device ) { } /** + * Load autoexec script from TFTP server + * + * @v device Device handle + * @ret rc Return status code + */ +static int efi_autoexec_tftp ( EFI_HANDLE device ) { + EFI_BOOT_SERVICES *bs = efi_systab->BootServices; + union { + void *interface; + EFI_PXE_BASE_CODE_PROTOCOL *pxe; + } u; + EFI_PXE_BASE_CODE_MODE *mode; + EFI_PXE_BASE_CODE_PACKET *packet; + union { + struct in_addr in; + EFI_IP_ADDRESS ip; + } server; + size_t filename_max; + char *filename; + char *sep; + UINT64 size; + VOID *data; + EFI_STATUS efirc; + int rc; + + /* Open PXE base code protocol */ + if ( ( efirc = bs->OpenProtocol ( device, + &efi_pxe_base_code_protocol_guid, + &u.interface, efi_image_handle, + device, + EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){ + rc = -EEFI ( efirc ); + DBGC ( device, "EFI %s has no PXE base code instance: %s\n", + efi_handle_name ( device ), strerror ( rc ) ); + goto err_pxe; + } + + /* Do not attempt to parse DHCPv6 packets */ + mode = u.pxe->Mode; + if ( mode->UsingIpv6 ) { + rc = -ENOTSUP; + DBGC ( device, "EFI %s has IPv6 PXE base code\n", + efi_handle_name ( device ) ); + goto err_ipv6; + } + + /* Identify relevant reply packet */ + if ( mode->PxeReplyReceived && + mode->PxeReply.Dhcpv4.BootpBootFile[0] ) { + /* Use boot filename if present in PXE reply */ + DBGC ( device, "EFI %s using PXE reply filename\n", + efi_handle_name ( device ) ); + packet = &mode->PxeReply; + } else if ( mode->DhcpAckReceived && + mode->DhcpAck.Dhcpv4.BootpBootFile[0] ) { + /* Otherwise, use boot filename if present in DHCPACK */ + DBGC ( device, "EFI %s using DHCPACK filename\n", + efi_handle_name ( device ) ); + packet = &mode->DhcpAck; + } else if ( mode->ProxyOfferReceived && + mode->ProxyOffer.Dhcpv4.BootpBootFile[0] ) { + /* Otherwise, use boot filename if present in ProxyDHCPOFFER */ + DBGC ( device, "EFI %s using ProxyDHCPOFFER filename\n", + efi_handle_name ( device ) ); + packet = &mode->ProxyOffer; + } else { + /* No boot filename available */ + rc = -ENOENT; + DBGC ( device, "EFI %s has no PXE boot filename\n", + efi_handle_name ( device ) ); + goto err_packet; + } + + /* Allocate filename */ + filename_max = ( sizeof ( packet->Dhcpv4.BootpBootFile ) + + ( sizeof ( efi_autoexec_name ) - 1 /* NUL */ ) + + 1 /* NUL */ ); + filename = zalloc ( filename_max ); + if ( ! filename ) { + rc = -ENOMEM; + goto err_filename; + } + + /* Extract next-server address and boot filename */ + memset ( &server, 0, sizeof ( server ) ); + memcpy ( &server.in, packet->Dhcpv4.BootpSiAddr, + sizeof ( server.in ) ); + memcpy ( filename, packet->Dhcpv4.BootpBootFile, + sizeof ( packet->Dhcpv4.BootpBootFile ) ); + + /* Update filename to autoexec script name */ + sep = strrchr ( filename, '/' ); + if ( ! sep ) + sep = strrchr ( filename, '\\' ); + if ( ! sep ) + sep = ( filename - 1 ); + strcpy ( ( sep + 1 ), efi_autoexec_name ); + + /* Get file size */ + if ( ( efirc = u.pxe->Mtftp ( u.pxe, + EFI_PXE_BASE_CODE_TFTP_GET_FILE_SIZE, + NULL, FALSE, &size, NULL, &server.ip, + ( ( UINT8 * ) filename ), NULL, + FALSE ) ) != 0 ) { + rc = -EEFI ( efirc ); + DBGC ( device, "EFI %s could not get size of %s:%s: %s\n", + efi_handle_name ( device ), inet_ntoa ( server.in ), + filename, strerror ( rc ) ); + goto err_size; + } + + /* Ignore zero-length files */ + if ( ! size ) { + rc = -EINVAL; + DBGC ( device, "EFI %s has zero-length %s:%s\n", + efi_handle_name ( device ), inet_ntoa ( server.in ), + filename ); + goto err_empty; + } + + /* Allocate temporary copy */ + if ( ( efirc = bs->AllocatePool ( EfiBootServicesData, size, + &data ) ) != 0 ) { + rc = -EEFI ( efirc ); + DBGC ( device, "EFI %s could not allocate %s:%s: %s\n", + efi_handle_name ( device ), inet_ntoa ( server.in ), + filename, strerror ( rc ) ); + goto err_alloc; + } + + /* Download file */ + if ( ( efirc = u.pxe->Mtftp ( u.pxe, EFI_PXE_BASE_CODE_TFTP_READ_FILE, + data, FALSE, &size, NULL, &server.ip, + ( ( UINT8 * ) filename ), NULL, + FALSE ) ) != 0 ) { + rc = -EEFI ( efirc ); + DBGC ( device, "EFI %s could not download %s:%s: %s\n", + efi_handle_name ( device ), inet_ntoa ( server.in ), + filename, strerror ( rc ) ); + goto err_download; + } + + /* Record autoexec script */ + efi_autoexec = data; + efi_autoexec_len = size; + data = NULL; + DBGC ( device, "EFI %s found %s:%s\n", efi_handle_name ( device ), + inet_ntoa ( server.in ), filename ); + + /* Success */ + rc = 0; + + err_download: + if ( data ) + bs->FreePool ( data ); + err_alloc: + err_empty: + err_size: + free ( filename ); + err_filename: + err_packet: + err_ipv6: + bs->CloseProtocol ( device, &efi_pxe_base_code_protocol_guid, + efi_image_handle, device ); + err_pxe: + return rc; +} + +/** * Load autoexec script * * @v device Device handle @@ -186,6 +358,10 @@ int efi_autoexec_load ( EFI_HANDLE device ) { if ( ( rc = efi_autoexec_filesystem ( device ) ) == 0 ) return 0; + /* Try loading via TFTP, if supported */ + if ( ( rc = efi_autoexec_tftp ( device ) ) == 0 ) + return 0; + return -ENOENT; } |