1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Facebook */
3
4 #include "vmlinux.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
7
8 char _license[] SEC("license") = "GPL";
9
10 struct {
11 __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
12 __uint(map_flags, BPF_F_NO_PREALLOC);
13 __type(key, int);
14 __type(value, long);
15 } map_a SEC(".maps");
16
17 struct {
18 __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
19 __uint(map_flags, BPF_F_NO_PREALLOC);
20 __type(key, int);
21 __type(value, long);
22 } map_b SEC(".maps");
23
24 SEC("fentry/bpf_local_storage_lookup")
BPF_PROG(on_lookup)25 int BPF_PROG(on_lookup)
26 {
27 struct task_struct *task = bpf_get_current_task_btf();
28
29 bpf_task_storage_delete(&map_a, task);
30 bpf_task_storage_delete(&map_b, task);
31 return 0;
32 }
33
34 SEC("fentry/bpf_local_storage_update")
BPF_PROG(on_update)35 int BPF_PROG(on_update)
36 {
37 struct task_struct *task = bpf_get_current_task_btf();
38 long *ptr;
39
40 ptr = bpf_task_storage_get(&map_a, task, 0,
41 BPF_LOCAL_STORAGE_GET_F_CREATE);
42 if (ptr)
43 *ptr += 1;
44
45 ptr = bpf_task_storage_get(&map_b, task, 0,
46 BPF_LOCAL_STORAGE_GET_F_CREATE);
47 if (ptr)
48 *ptr += 1;
49
50 return 0;
51 }
52
53 SEC("tp_btf/sys_enter")
BPF_PROG(on_enter,struct pt_regs * regs,long id)54 int BPF_PROG(on_enter, struct pt_regs *regs, long id)
55 {
56 struct task_struct *task;
57 long *ptr;
58
59 task = bpf_get_current_task_btf();
60 ptr = bpf_task_storage_get(&map_a, task, 0,
61 BPF_LOCAL_STORAGE_GET_F_CREATE);
62 if (ptr)
63 *ptr = 200;
64
65 ptr = bpf_task_storage_get(&map_b, task, 0,
66 BPF_LOCAL_STORAGE_GET_F_CREATE);
67 if (ptr)
68 *ptr = 100;
69 return 0;
70 }
71