libbpf-rs 0.26.2

libbpf-rs is a safe, idiomatic, and opinionated wrapper around libbpf-sys
Documentation 
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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

char _license[] SEC("license") = "GPL";

struct {
    __uint(type, BPF_MAP_TYPE_ARRAY);
    __type(key, u32);
    __type(value, u32);
    __uint(max_entries, 1);
} test_counter_map SEC(".maps");

SEC("struct_ops/test_1")
int BPF_PROG(test_1, struct bpf_dummy_ops_state *state)
{
    int ret;

    if (!state)
        return 0xf2f3f4f5;

    ret = state->val;
    state->val = 0x5a;
    return ret;
}

__u64 test_2_args[5];

SEC("struct_ops/test_2")
int BPF_PROG(test_2, struct bpf_dummy_ops_state *state, int a1,
             unsigned short a2, char a3, unsigned long a4)
{
    test_2_args[0] = (unsigned long)state;
    test_2_args[1] = a1;
    test_2_args[2] = a2;
    test_2_args[3] = a3;
    test_2_args[4] = a4;
    return 0;
}

SEC("xdp")
int xdp_counter(struct xdp_md *ctx)
{
    u32 key = 0;
    u32 *value = bpf_map_lookup_elem(&test_counter_map, &key);
    if (value) {
        *value += 1;
        return XDP_PASS;
    }
    return XDP_DROP;
}

SEC(".struct_ops")
struct bpf_dummy_ops dummy_1 = {
    .test_1 = (void *)test_1,
    .test_2 = (void *)test_2,
};