ebpf_windows.h

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// Copyright (c) eBPF for Windows contributors
// SPDX-License-Identifier: MIT
#pragma once
 
#define EBPF_OFFSET_OF(s, m) (((size_t) & ((s*)0)->m))
#define EBPF_FIELD_SIZE(s, m) (sizeof(((s*)0)->m))
#define EBPF_SIZE_INCLUDING_FIELD(s, m) (EBPF_OFFSET_OF(s, m) + EBPF_FIELD_SIZE(s, m))
 
#ifdef _MSC_VER
#include <guiddef.h>
#else
typedef uint8_t GUID[16];
#endif
 
#if !defined(NO_CRT) && !defined(_NO_CRT_STDIO_INLINE)
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#else
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned short wchar_t;
typedef unsigned int uint32_t;
typedef unsigned long long uint64_t;
typedef unsigned long long size_t;
#define bool _Bool
#endif
 
// This file contains eBPF definitions needed by eBPF programs as well as
// the verifier, execution context and extension drivers.
 
#define EBPF_ROOT_REGISTRY_PATH L"\\Registry\\Machine\\Software\\eBPF"
#define EBPF_ROOT_RELATIVE_PATH L"Software\\eBPF"
#define EBPF_STORE_REGISTRY_PATH L"Software\\eBPF\\Providers"
 
#define EBPF_PROVIDERS_REGISTRY_KEY L"Providers"
#define EBPF_SECTIONS_REGISTRY_KEY L"SectionData"
#define EBPF_PROGRAM_DATA_REGISTRY_KEY L"ProgramData"
#define EBPF_PROGRAM_TYPE_DESCRIPTOR_REGISTRY_KEY L"TypeDescriptor"
#define EBPF_PROGRAM_DATA_HELPERS_REGISTRY_KEY L"Helpers"
#define EBPF_GLOBAL_HELPERS_REGISTRY_KEY L"GlobalHelpers"
 
#define EBPF_EXTENSION_HEADER_VERSION L"Version"
#define EBPF_EXTENSION_HEADER_SIZE L"Size"
 
#define EBPF_SECTION_DATA_PROGRAM_TYPE L"ProgramType"
#define EBPF_SECTION_DATA_ATTACH_TYPE L"AttachType"
 
#define EBPF_PROGRAM_DATA_NAME L"Name"
#define EBPF_PROGRAM_DATA_CONTEXT_DESCRIPTOR L"ContextDescriptor"
#define EBPF_PROGRAM_DATA_PLATFORM_SPECIFIC_DATA L"PlatformSpecificData"
#define EBPF_PROGRAM_DATA_PRIVILEGED L"IsPrivileged"
#define EBPF_PROGRAM_DATA_HELPER_COUNT L"HelperCount"
 
#define EBPF_HELPER_DATA_PROTOTYPE L"Prototype"
#define EBPF_HELPER_DATA_REALLOCATE_PACKET L"ReallocatePacket"
 
#define EBPF_DATA_BPF_PROG_TYPE L"BpfProgType"
#define EBPF_DATA_BPF_ATTACH_TYPE L"BpfAttachType"
 
typedef GUID ebpf_program_type_t;
typedef GUID ebpf_attach_type_t;
 
typedef enum _ebpf_helper_function
{
    EBPF_LOOKUP_ELEMENT = 1, 
    EBPF_UPDATE_ELEMENT = 2, 
    EBPF_DELETE_ELEMENT = 3, 
} ebpf_helper_function_t;
 
#define EBPF_MAX_GENERAL_HELPER_FUNCTION 0xFFFF
 
#define EBPF_ATTACH_CLIENT_DATA_CURRENT_VERSION 1
#define EBPF_PROGRAM_INFORMATION_CLIENT_DATA_CURRENT_VERSION 1
 
// Version 1 of the eBPF extension data structures and their lengths.
#define EBPF_ATTACH_PROVIDER_DATA_CURRENT_VERSION 1
#define EBPF_ATTACH_PROVIDER_DATA_CURRENT_VERSION_SIZE EBPF_SIZE_INCLUDING_FIELD(ebpf_attach_provider_data_t, link_type)
#define EBPF_ATTACH_PROVIDER_DATA_CURRENT_VERSION_TOTAL_SIZE sizeof(ebpf_attach_provider_data_t)
#define EBPF_ATTACH_PROVIDER_DATA_HEADER                                                           \
    {                                                                                              \
        EBPF_ATTACH_PROVIDER_DATA_CURRENT_VERSION, EBPF_ATTACH_PROVIDER_DATA_CURRENT_VERSION_SIZE, \
            EBPF_ATTACH_PROVIDER_DATA_CURRENT_VERSION_TOTAL_SIZE                                   \
    }
 
#define EBPF_PROGRAM_TYPE_DESCRIPTOR_CURRENT_VERSION 1
#define EBPF_PROGRAM_TYPE_DESCRIPTOR_CURRENT_VERSION_SIZE \
    EBPF_SIZE_INCLUDING_FIELD(ebpf_program_type_descriptor_t, is_privileged)
#define EBPF_PROGRAM_TYPE_DESCRIPTOR_CURRENT_VERSION_TOTAL_SIZE sizeof(ebpf_program_type_descriptor_t)
#define EBPF_PROGRAM_TYPE_DESCRIPTOR_HEADER                                                              \
    {                                                                                                    \
        EBPF_PROGRAM_TYPE_DESCRIPTOR_CURRENT_VERSION, EBPF_PROGRAM_TYPE_DESCRIPTOR_CURRENT_VERSION_SIZE, \
            EBPF_PROGRAM_TYPE_DESCRIPTOR_CURRENT_VERSION_TOTAL_SIZE                                      \
    }
 
#define EBPF_HELPER_FUNCTION_PROTOTYPE_CURRENT_VERSION 1
#define EBPF_HELPER_FUNCTION_PROTOTYPE_CURRENT_VERSION_SIZE \
    EBPF_SIZE_INCLUDING_FIELD(ebpf_helper_function_prototype_t, implicit_context)
#define EBPF_HELPER_FUNCTION_PROTOTYPE_CURRENT_VERSION_TOTAL_SIZE sizeof(ebpf_helper_function_prototype_t)
#define EBPF_HELPER_FUNCTION_PROTOTYPE_HEADER                                                                \
    {                                                                                                        \
        EBPF_HELPER_FUNCTION_PROTOTYPE_CURRENT_VERSION, EBPF_HELPER_FUNCTION_PROTOTYPE_CURRENT_VERSION_SIZE, \
            EBPF_HELPER_FUNCTION_PROTOTYPE_CURRENT_VERSION_TOTAL_SIZE                                        \
    }
 
#define EBPF_PROGRAM_INFORMATION_CURRENT_VERSION 1
#define EBPF_PROGRAM_INFORMATION_CURRENT_VERSION_SIZE \
    EBPF_SIZE_INCLUDING_FIELD(ebpf_program_info_t, global_helper_prototype)
#define EBPF_PROGRAM_INFORMATION_CURRENT_VERSION_TOTAL_SIZE sizeof(ebpf_program_info_t)
#define EBPF_PROGRAM_INFORMATION_HEADER                                                          \
    {                                                                                            \
        EBPF_PROGRAM_INFORMATION_CURRENT_VERSION, EBPF_PROGRAM_INFORMATION_CURRENT_VERSION_SIZE, \
            EBPF_PROGRAM_INFORMATION_CURRENT_VERSION_TOTAL_SIZE                                  \
    }
 
#define EBPF_HELPER_FUNCTION_ADDRESSES_CURRENT_VERSION 1
#define EBPF_HELPER_FUNCTION_ADDRESSES_CURRENT_VERSION_SIZE \
    EBPF_SIZE_INCLUDING_FIELD(ebpf_helper_function_addresses_t, helper_function_address)
#define EBPF_HELPER_FUNCTION_ADDRESSES_CURRENT_VERSION_TOTAL_SIZE sizeof(ebpf_helper_function_addresses_t)
#define EBPF_HELPER_FUNCTION_ADDRESSES_HEADER                                                                \
    {                                                                                                        \
        EBPF_HELPER_FUNCTION_ADDRESSES_CURRENT_VERSION, EBPF_HELPER_FUNCTION_ADDRESSES_CURRENT_VERSION_SIZE, \
            EBPF_HELPER_FUNCTION_ADDRESSES_CURRENT_VERSION_TOTAL_SIZE                                        \
    }
 
#define EBPF_PROGRAM_DATA_CURRENT_VERSION 1
#define EBPF_PROGRAM_DATA_CURRENT_VERSION_SIZE EBPF_SIZE_INCLUDING_FIELD(ebpf_program_data_t, capabilities)
#define EBPF_PROGRAM_DATA_CURRENT_VERSION_TOTAL_SIZE sizeof(ebpf_program_data_t)
#define EBPF_PROGRAM_DATA_HEADER                                                   \
    {                                                                              \
        EBPF_PROGRAM_DATA_CURRENT_VERSION, EBPF_PROGRAM_DATA_CURRENT_VERSION_SIZE, \
            EBPF_PROGRAM_DATA_CURRENT_VERSION_TOTAL_SIZE                           \
    }
 
#define EBPF_PROGRAM_SECTION_INFORMATION_CURRENT_VERSION 1
#define EBPF_PROGRAM_SECTION_INFORMATION_CURRENT_VERSION_SIZE \
    EBPF_SIZE_INCLUDING_FIELD(ebpf_program_section_info_t, bpf_attach_type)
#define EBPF_PROGRAM_SECTION_INFORMATION_CURRENT_VERSION_TOTAL_SIZE sizeof(ebpf_program_section_info_t)
#define EBPF_PROGRAM_SECTION_INFORMATION_HEADER                                                                  \
    {                                                                                                            \
        EBPF_PROGRAM_SECTION_INFORMATION_CURRENT_VERSION, EBPF_PROGRAM_SECTION_INFORMATION_CURRENT_VERSION_SIZE, \
            EBPF_PROGRAM_SECTION_INFORMATION_CURRENT_VERSION_TOTAL_SIZE                                          \
    }
 
typedef struct _ebpf_extension_header
{
    uint16_t version;  
    size_t size;       
    size_t total_size; 
} ebpf_extension_header_t;