ebpf_helpers.h

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// Copyright (c) Microsoft Corporation
// SPDX-License-Identifier: MIT
#pragma once
 
#include <stdint.h>
 
#include "ebpf_structs.h"
 
#define MAX_TAIL_CALL_CNT 32
 
// For eBPF programs, struct bpf_map means struct _ebpf_map_definition_in_file,
// since they use inner_map_idx and pass pointers to such structures to the various
// map APIs.
#define bpf_map _ebpf_map_definition_in_file
 
#ifndef __doxygen
#define EBPF_HELPER(return_type, name, args) typedef return_type(*name##_t) args
#endif
 
// This file contains APIs for global helpers that are
// exposed for use by all eBPF programs.
 
EBPF_HELPER(void*, bpf_map_lookup_elem, (struct bpf_map * map, void* key));
#ifndef __doxygen
#define bpf_map_lookup_elem ((bpf_map_lookup_elem_t)1)
#endif
 
EBPF_HELPER(int64_t, bpf_map_update_elem, (struct bpf_map * map, void* key, void* value, uint64_t flags));
#ifndef __doxygen
#define bpf_map_update_elem ((bpf_map_update_elem_t)2)
#endif
 
EBPF_HELPER(int64_t, bpf_map_delete_elem, (struct bpf_map * map, void* key));
#ifndef __doxygen
#define bpf_map_delete_elem ((bpf_map_delete_elem_t)3)
#endif
 
EBPF_HELPER(int64_t, bpf_tail_call, (void* ctx, struct bpf_map* prog_array_map, uint32_t index));
#ifndef __doxygen
#define bpf_tail_call ((bpf_tail_call_t)4)
#endif
 
EBPF_HELPER(uint32_t, bpf_get_prandom_u32, ());
#ifndef __doxygen
#define bpf_get_prandom_u32 ((bpf_get_prandom_u32_t)5)
#endif
 
EBPF_HELPER(uint64_t, bpf_ktime_get_boot_ns, ());
#ifndef __doxygen
#define bpf_ktime_get_boot_ns ((bpf_ktime_get_boot_ns_t)6)
#endif
 
EBPF_HELPER(uint64_t, bpf_get_smp_processor_id, ());
#ifndef __doxygen
#define bpf_get_smp_processor_id ((bpf_get_smp_processor_id_t)7)
#endif
 
#define SEC(name) __attribute__((section(name), used))