1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3
4#include <vmlinux.h>
5#include <bpf/bpf_tracing.h>
6#include <bpf/bpf_helpers.h>
7
8struct {
9 __uint(type, BPF_MAP_TYPE_SK_STORAGE);
10 __uint(map_flags, BPF_F_NO_PREALLOC);
11 __type(key, int);
12 __type(value, int);
13} sk_stg_map SEC(".maps");
14
15SEC("fentry/bpf_sk_storage_free")
16int BPF_PROG(trace_bpf_sk_storage_free, struct sock *sk)
17{
18 int *value;
19
20 value = bpf_sk_storage_get(&sk_stg_map, sk, 0,
21 BPF_SK_STORAGE_GET_F_CREATE);
22
23 if (value)
24 *value = 1;
25
26 return 0;
27}
28
29char _license[] SEC("license") = "GPL";
30

source code of linux/tools/testing/selftests/bpf/progs/test_sk_storage_trace_itself.c