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[linux.git] / tools / testing / selftests / bpf / progs / lsm_tailcall.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2024 Huawei Technologies Co., Ltd */
3
4 #include "vmlinux.h"
5 #include <errno.h>
6 #include <bpf/bpf_helpers.h>
7
8 char _license[] SEC("license") = "GPL";
9
10 struct {
11         __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
12         __uint(max_entries, 1);
13         __uint(key_size, sizeof(__u32));
14         __uint(value_size, sizeof(__u32));
15 } jmp_table SEC(".maps");
16
17 SEC("lsm/file_permission")
18 int lsm_file_permission_prog(void *ctx)
19 {
20         return 0;
21 }
22
23 SEC("lsm/file_alloc_security")
24 int lsm_file_alloc_security_prog(void *ctx)
25 {
26         return 0;
27 }
28
29 SEC("lsm/file_alloc_security")
30 int lsm_file_alloc_security_entry(void *ctx)
31 {
32         bpf_tail_call_static(ctx, &jmp_table, 0);
33         return 0;
34 }
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