ebpf_program_types.h

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// Copyright (c) eBPF for Windows contributors
// SPDX-License-Identifier: MIT
#pragma once
 
#include "ebpf_base.h"
#include "ebpf_result.h"
#include "ebpf_windows.h"
 
#define EBPF_MAX_PROGRAM_DESCRIPTOR_NAME_LENGTH 256
#define EBPF_MAX_HELPER_FUNCTION_NAME_LENGTH 256
 
// This is the type definition for the eBPF program type descriptor
// when version is EBPF_PROGRAM_TYPE_DESCRIPTOR_CURRENT_VERSION.
typedef struct _ebpf_program_type_descriptor
{
    ebpf_extension_header_t header;
    const char* name;
    const ebpf_context_descriptor_t* context_descriptor;
    GUID program_type;
    uint32_t bpf_prog_type;
    char is_privileged;
} ebpf_program_type_descriptor_t;
 
typedef struct _ebpf_helper_function_prototype_flags
{
    bool reallocate_packet : 1;
} ebpf_helper_function_prototype_flags_t;
 
// This is the type definition for the eBPF helper function prototype
// when version is EBPF_HELPER_FUNCTION_PROTOTYPE_CURRENT_VERSION.
typedef struct _ebpf_helper_function_prototype
{
    ebpf_extension_header_t header;
    uint32_t helper_id;
    const char* name;
    ebpf_return_type_t return_type;
    ebpf_argument_type_t arguments[5];
    ebpf_helper_function_prototype_flags_t flags;
    bool implicit_context;
} ebpf_helper_function_prototype_t;
 
// This is the type definition for the eBPF program information
// when version is EBPF_PROGRAM_INFORMATION_CURRENT_VERSION.
typedef struct _ebpf_program_info
{
    ebpf_extension_header_t header;
    const ebpf_program_type_descriptor_t* program_type_descriptor;
    uint32_t count_of_program_type_specific_helpers;
    const ebpf_helper_function_prototype_t* program_type_specific_helper_prototype;
    uint32_t count_of_global_helpers;
    const ebpf_helper_function_prototype_t* global_helper_prototype;
} ebpf_program_info_t;
 
// This is the type definition for the eBPF helper function addresses
// when version is EBPF_HELPER_FUNCTION_ADDRESSES_CURRENT_VERSION.
typedef struct _ebpf_helper_function_addresses
{
    ebpf_extension_header_t header;
    uint32_t helper_function_count;
    uint64_t* helper_function_address;
} ebpf_helper_function_addresses_t;
 
typedef ebpf_result_t (*ebpf_program_context_create_t)(
    _In_reads_bytes_opt_(data_size_in) const uint8_t* data_in,
    size_t data_size_in,
    _In_reads_bytes_opt_(context_size_in) const uint8_t* context_in,
    size_t context_size_in,
    _Outptr_ void** context);
 
typedef void (*ebpf_program_context_destroy_t)(
    _In_ void* context,
    _Out_writes_bytes_to_opt_(*data_size_out, *data_size_out) uint8_t* data_out,
    _Inout_ size_t* data_size_out,
    _Out_writes_bytes_to_opt_(*context_size_out, *context_size_out) uint8_t* context_out,
    _Inout_ size_t* context_size_out);
 
#pragma warning(push)
#pragma warning(disable : 4201) // nonstandard extension used: nameless struct/union
typedef union _program_data_capabilities
{
    uint32_t value;
    struct
    {
        bool supports_context_header : 1; // Program supports context header.
    };
} program_data_capabilities_t;
 
// This is the type definition for the eBPF program data
// when version is EBPF_PROGRAM_DATA_CURRENT_VERSION.
typedef struct _ebpf_program_data
{
    ebpf_extension_header_t header;
    const ebpf_program_info_t* program_info; 
    const ebpf_helper_function_addresses_t*
        program_type_specific_helper_function_addresses; 
    const ebpf_helper_function_addresses_t*
        global_helper_function_addresses;           
    ebpf_program_context_create_t context_create;   
    ebpf_program_context_destroy_t context_destroy; 
    uint8_t required_irql;                          
    program_data_capabilities_t capabilities;       
} ebpf_program_data_t;
#pragma warning(pop)
 
static_assert(
    EBPF_FIELD_SIZE(ebpf_program_data_t, capabilities) == sizeof(uint32_t), "Size of capabilities is 32 bits.");
 
// This is the type definition for the eBPF program section information
// when version is EBPF_PROGRAM_SECTION_INFORMATION_CURRENT_VERSION.
typedef struct _ebpf_program_section_info
{
    ebpf_extension_header_t header;
    const wchar_t* section_name;
    const GUID* program_type;
    const GUID* attach_type;
    uint32_t bpf_program_type;
    uint32_t bpf_attach_type;
} ebpf_program_section_info_t;