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637 lines
20 KiB
C
637 lines
20 KiB
C
/*-
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* Copyright (c) 2017 Netflix, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Routines to format EFI_DEVICE_PATHs from the UEFI standard. Much of
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* this file is taken from EDK2 and rototilled.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <efivar.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/endian.h>
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#include "efi-osdep.h"
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#include "uefi-dplib.h"
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/* XXX maybe I should include the entire DevicePathUtiltiies.c and ifdef out what we don't use */
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/*
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* Taken from MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c
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* hash a11928f3310518ab1c6fd34e8d0fdbb72de9602c 2017-Mar-01
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*/
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/** @file
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Device Path services. The thing to remember is device paths are built out of
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nodes. The device path is terminated by an end node that is length
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sizeof(EFI_DEVICE_PATH_PROTOCOL). That would be why there is sizeof(EFI_DEVICE_PATH_PROTOCOL)
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all over this file.
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The only place where multi-instance device paths are supported is in
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environment varibles. Multi-instance device paths should never be placed
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on a Handle.
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Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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//
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// Template for an end-of-device path node.
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//
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static CONST EFI_DEVICE_PATH_PROTOCOL mUefiDevicePathLibEndDevicePath = {
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END_DEVICE_PATH_TYPE,
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END_ENTIRE_DEVICE_PATH_SUBTYPE,
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{
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END_DEVICE_PATH_LENGTH,
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0
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}
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};
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/**
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Returns the size of a device path in bytes.
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This function returns the size, in bytes, of the device path data structure
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specified by DevicePath including the end of device path node.
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If DevicePath is NULL or invalid, then 0 is returned.
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@param DevicePath A pointer to a device path data structure.
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@retval 0 If DevicePath is NULL or invalid.
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@retval Others The size of a device path in bytes.
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**/
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UINTN
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EFIAPI
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GetDevicePathSize (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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CONST EFI_DEVICE_PATH_PROTOCOL *Start;
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if (DevicePath == NULL) {
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return 0;
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}
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if (!IsDevicePathValid (DevicePath, 0)) {
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return 0;
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}
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//
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// Search for the end of the device path structure
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//
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Start = DevicePath;
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while (!IsDevicePathEnd (DevicePath)) {
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DevicePath = NextDevicePathNode (DevicePath);
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}
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//
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// Compute the size and add back in the size of the end device path structure
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//
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return ((UINTN) DevicePath - (UINTN) Start) + DevicePathNodeLength (DevicePath);
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}
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/**
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Determine whether a given device path is valid.
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If DevicePath is NULL, then ASSERT().
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@param DevicePath A pointer to a device path data structure.
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@param MaxSize The maximum size of the device path data structure.
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@retval TRUE DevicePath is valid.
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@retval FALSE The length of any node in the DevicePath is less
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than sizeof (EFI_DEVICE_PATH_PROTOCOL).
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@retval FALSE If MaxSize is not zero, the size of the DevicePath
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exceeds MaxSize.
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@retval FALSE If PcdMaximumDevicePathNodeCount is not zero, the node
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count of the DevicePath exceeds PcdMaximumDevicePathNodeCount.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathValid (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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IN UINTN MaxSize
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)
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{
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UINTN Count;
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UINTN Size;
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UINTN NodeLength;
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ASSERT (DevicePath != NULL);
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if (MaxSize == 0) {
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MaxSize = MAX_UINTN;
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}
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//
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// Validate the input size big enough to touch the first node.
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//
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if (MaxSize < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
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return FALSE;
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}
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for (Count = 0, Size = 0; !IsDevicePathEnd (DevicePath); DevicePath = NextDevicePathNode (DevicePath)) {
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NodeLength = DevicePathNodeLength (DevicePath);
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if (NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
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return FALSE;
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}
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if (NodeLength > MAX_UINTN - Size) {
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return FALSE;
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}
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Size += NodeLength;
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//
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// Validate next node before touch it.
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//
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if (Size > MaxSize - END_DEVICE_PATH_LENGTH ) {
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return FALSE;
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}
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if (PcdGet32 (PcdMaximumDevicePathNodeCount) > 0) {
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Count++;
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if (Count >= PcdGet32 (PcdMaximumDevicePathNodeCount)) {
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return FALSE;
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}
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}
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}
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//
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// Only return TRUE when the End Device Path node is valid.
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//
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return (BOOLEAN) (DevicePathNodeLength (DevicePath) == END_DEVICE_PATH_LENGTH);
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}
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/**
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Returns the Type field of a device path node.
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Returns the Type field of the device path node specified by Node.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return The Type field of the device path node specified by Node.
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**/
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UINT8
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EFIAPI
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DevicePathType (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ((const EFI_DEVICE_PATH_PROTOCOL *)(Node))->Type;
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}
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/**
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Returns the SubType field of a device path node.
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Returns the SubType field of the device path node specified by Node.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return The SubType field of the device path node specified by Node.
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**/
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UINT8
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EFIAPI
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DevicePathSubType (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ((const EFI_DEVICE_PATH_PROTOCOL *)(Node))->SubType;
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}
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/**
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Returns the 16-bit Length field of a device path node.
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Returns the 16-bit Length field of the device path node specified by Node.
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Node is not required to be aligned on a 16-bit boundary, so it is recommended
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that a function such as ReadUnaligned16() be used to extract the contents of
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the Length field.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return The 16-bit Length field of the device path node specified by Node.
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**/
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UINTN
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EFIAPI
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DevicePathNodeLength (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ((const EFI_DEVICE_PATH_PROTOCOL *)Node)->Length[0] |
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(((const EFI_DEVICE_PATH_PROTOCOL *)Node)->Length[1] << 8);
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}
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/**
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Returns a pointer to the next node in a device path.
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Returns a pointer to the device path node that follows the device path node
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specified by Node.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return a pointer to the device path node that follows the device path node
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specified by Node.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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NextDevicePathNode (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ((EFI_DEVICE_PATH_PROTOCOL *)(__DECONST(UINT8 *, Node) + DevicePathNodeLength(Node)));
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}
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/**
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Determines if a device path node is an end node of a device path.
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This includes nodes that are the end of a device path instance and nodes that
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are the end of an entire device path.
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Determines if the device path node specified by Node is an end node of a device path.
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This includes nodes that are the end of a device path instance and nodes that are the
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end of an entire device path. If Node represents an end node of a device path,
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then TRUE is returned. Otherwise, FALSE is returned.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@retval TRUE The device path node specified by Node is an end node of a
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device path.
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@retval FALSE The device path node specified by Node is not an end node of
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a device path.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathEndType (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return (BOOLEAN) (DevicePathType (Node) == END_DEVICE_PATH_TYPE);
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}
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/**
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Determines if a device path node is an end node of an entire device path.
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Determines if a device path node specified by Node is an end node of an entire
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device path. If Node represents the end of an entire device path, then TRUE is
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returned. Otherwise, FALSE is returned.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@retval TRUE The device path node specified by Node is the end of an entire
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device path.
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@retval FALSE The device path node specified by Node is not the end of an
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entire device path.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathEnd (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return (BOOLEAN) (IsDevicePathEndType (Node) && DevicePathSubType(Node) == END_ENTIRE_DEVICE_PATH_SUBTYPE);
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}
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/**
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Fills in all the fields of a device path node that is the end of an entire device path.
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Fills in all the fields of a device path node specified by Node so Node represents
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the end of an entire device path. The Type field of Node is set to
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END_DEVICE_PATH_TYPE, the SubType field of Node is set to
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END_ENTIRE_DEVICE_PATH_SUBTYPE, and the Length field of Node is set to
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END_DEVICE_PATH_LENGTH. Node is not required to be aligned on a 16-bit boundary,
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so it is recommended that a function such as WriteUnaligned16() be used to set
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the contents of the Length field.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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**/
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VOID
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EFIAPI
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SetDevicePathEndNode (
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OUT VOID *Node
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)
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{
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ASSERT (Node != NULL);
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memcpy (Node, &mUefiDevicePathLibEndDevicePath, sizeof (mUefiDevicePathLibEndDevicePath));
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}
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/**
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Sets the length, in bytes, of a device path node.
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Sets the length of the device path node specified by Node to the value specified
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by NodeLength. NodeLength is returned. Node is not required to be aligned on
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a 16-bit boundary, so it is recommended that a function such as WriteUnaligned16()
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be used to set the contents of the Length field.
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If Node is NULL, then ASSERT().
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If NodeLength >= SIZE_64KB, then ASSERT().
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If NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL), then ASSERT().
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@param Node A pointer to a device path node data structure.
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@param Length The length, in bytes, of the device path node.
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@return Length
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**/
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UINT16
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EFIAPI
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SetDevicePathNodeLength (
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IN OUT VOID *Node,
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IN UINTN Length
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)
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{
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ASSERT (Node != NULL);
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ASSERT ((Length >= sizeof (EFI_DEVICE_PATH_PROTOCOL)) && (Length < SIZE_64KB));
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// return WriteUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0], (UINT16)(Length));
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le16enc(&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0], (UINT16)(Length));
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return Length;
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}
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/**
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Creates a device node.
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This function creates a new device node in a newly allocated buffer of size
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NodeLength and initializes the device path node header with NodeType and NodeSubType.
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The new device path node is returned.
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If NodeLength is smaller than a device path header, then NULL is returned.
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If there is not enough memory to allocate space for the new device path, then
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NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility
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of the caller to free the memory allocated.
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@param NodeType The device node type for the new device node.
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@param NodeSubType The device node sub-type for the new device node.
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@param NodeLength The length of the new device node.
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@return The new device path.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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CreateDeviceNode (
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IN UINT8 NodeType,
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IN UINT8 NodeSubType,
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IN UINT16 NodeLength
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)
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{
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EFI_DEVICE_PATH_PROTOCOL *DevicePath;
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if (NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
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//
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// NodeLength is less than the size of the header.
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//
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return NULL;
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}
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DevicePath = AllocateZeroPool (NodeLength);
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if (DevicePath != NULL) {
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DevicePath->Type = NodeType;
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DevicePath->SubType = NodeSubType;
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SetDevicePathNodeLength (DevicePath, NodeLength);
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}
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return DevicePath;
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}
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/**
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Creates a new copy of an existing device path.
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This function allocates space for a new copy of the device path specified by DevicePath.
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If DevicePath is NULL, then NULL is returned. If the memory is successfully
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allocated, then the contents of DevicePath are copied to the newly allocated
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buffer, and a pointer to that buffer is returned. Otherwise, NULL is returned.
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The memory for the new device path is allocated from EFI boot services memory.
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It is the responsibility of the caller to free the memory allocated.
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@param DevicePath A pointer to a device path data structure.
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@retval NULL DevicePath is NULL or invalid.
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@retval Others A pointer to the duplicated device path.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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DuplicateDevicePath (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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UINTN Size;
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//
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// Compute the size
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//
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Size = GetDevicePathSize (DevicePath);
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if (Size == 0) {
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return NULL;
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}
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//
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// Allocate space for duplicate device path
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//
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return AllocateCopyPool (Size, DevicePath);
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}
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/**
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Creates a new device path by appending a second device path to a first device path.
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This function creates a new device path by appending a copy of SecondDevicePath
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to a copy of FirstDevicePath in a newly allocated buffer. Only the end-of-device-path
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device node from SecondDevicePath is retained. The newly created device path is
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returned. If FirstDevicePath is NULL, then it is ignored, and a duplicate of
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SecondDevicePath is returned. If SecondDevicePath is NULL, then it is ignored,
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and a duplicate of FirstDevicePath is returned. If both FirstDevicePath and
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SecondDevicePath are NULL, then a copy of an end-of-device-path is returned.
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If there is not enough memory for the newly allocated buffer, then NULL is returned.
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The memory for the new device path is allocated from EFI boot services memory.
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It is the responsibility of the caller to free the memory allocated.
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@param FirstDevicePath A pointer to a device path data structure.
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@param SecondDevicePath A pointer to a device path data structure.
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@retval NULL If there is not enough memory for the newly allocated buffer.
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@retval NULL If FirstDevicePath or SecondDevicePath is invalid.
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@retval Others A pointer to the new device path if success.
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Or a copy an end-of-device-path if both FirstDevicePath and SecondDevicePath are NULL.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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AppendDevicePath (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL
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IN CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL
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)
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{
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UINTN Size;
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UINTN Size1;
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UINTN Size2;
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EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;
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EFI_DEVICE_PATH_PROTOCOL *DevicePath2;
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//
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// If there's only 1 path, just duplicate it.
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//
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if (FirstDevicePath == NULL) {
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return DuplicateDevicePath ((SecondDevicePath != NULL) ? SecondDevicePath : &mUefiDevicePathLibEndDevicePath);
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}
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if (SecondDevicePath == NULL) {
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return DuplicateDevicePath (FirstDevicePath);
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}
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if (!IsDevicePathValid (FirstDevicePath, 0) || !IsDevicePathValid (SecondDevicePath, 0)) {
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return NULL;
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}
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//
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// Allocate space for the combined device path. It only has one end node of
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// length EFI_DEVICE_PATH_PROTOCOL.
|
|
//
|
|
Size1 = GetDevicePathSize (FirstDevicePath);
|
|
Size2 = GetDevicePathSize (SecondDevicePath);
|
|
Size = Size1 + Size2 - END_DEVICE_PATH_LENGTH;
|
|
|
|
NewDevicePath = AllocatePool (Size);
|
|
|
|
if (NewDevicePath != NULL) {
|
|
NewDevicePath = CopyMem (NewDevicePath, FirstDevicePath, Size1);
|
|
//
|
|
// Over write FirstDevicePath EndNode and do the copy
|
|
//
|
|
DevicePath2 = (EFI_DEVICE_PATH_PROTOCOL *) ((CHAR8 *) NewDevicePath +
|
|
(Size1 - END_DEVICE_PATH_LENGTH));
|
|
CopyMem (DevicePath2, SecondDevicePath, Size2);
|
|
}
|
|
|
|
return NewDevicePath;
|
|
}
|
|
|
|
/**
|
|
Creates a new path by appending the device node to the device path.
|
|
|
|
This function creates a new device path by appending a copy of the device node
|
|
specified by DevicePathNode to a copy of the device path specified by DevicePath
|
|
in an allocated buffer. The end-of-device-path device node is moved after the
|
|
end of the appended device node.
|
|
If DevicePathNode is NULL then a copy of DevicePath is returned.
|
|
If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device
|
|
path device node is returned.
|
|
If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path
|
|
device node is returned.
|
|
If there is not enough memory to allocate space for the new device path, then
|
|
NULL is returned.
|
|
The memory is allocated from EFI boot services memory. It is the responsibility
|
|
of the caller to free the memory allocated.
|
|
|
|
@param DevicePath A pointer to a device path data structure.
|
|
@param DevicePathNode A pointer to a single device path node.
|
|
|
|
@retval NULL If there is not enough memory for the new device path.
|
|
@retval Others A pointer to the new device path if success.
|
|
A copy of DevicePathNode followed by an end-of-device-path node
|
|
if both FirstDevicePath and SecondDevicePath are NULL.
|
|
A copy of an end-of-device-path node if both FirstDevicePath
|
|
and SecondDevicePath are NULL.
|
|
|
|
**/
|
|
EFI_DEVICE_PATH_PROTOCOL *
|
|
EFIAPI
|
|
AppendDevicePathNode (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL
|
|
)
|
|
{
|
|
EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;
|
|
EFI_DEVICE_PATH_PROTOCOL *NextNode;
|
|
EFI_DEVICE_PATH_PROTOCOL *NewDevicePath;
|
|
UINTN NodeLength;
|
|
|
|
if (DevicePathNode == NULL) {
|
|
return DuplicateDevicePath ((DevicePath != NULL) ? DevicePath : &mUefiDevicePathLibEndDevicePath);
|
|
}
|
|
//
|
|
// Build a Node that has a terminator on it
|
|
//
|
|
NodeLength = DevicePathNodeLength (DevicePathNode);
|
|
|
|
TempDevicePath = AllocatePool (NodeLength + END_DEVICE_PATH_LENGTH);
|
|
if (TempDevicePath == NULL) {
|
|
return NULL;
|
|
}
|
|
TempDevicePath = CopyMem (TempDevicePath, DevicePathNode, NodeLength);
|
|
//
|
|
// Add and end device path node to convert Node to device path
|
|
//
|
|
NextNode = NextDevicePathNode (TempDevicePath);
|
|
SetDevicePathEndNode (NextNode);
|
|
//
|
|
// Append device paths
|
|
//
|
|
NewDevicePath = AppendDevicePath (DevicePath, TempDevicePath);
|
|
|
|
FreePool (TempDevicePath);
|
|
|
|
return NewDevicePath;
|
|
}
|