1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
  3
  4#include "vmlinux.h"
  5#include <bpf/bpf_helpers.h>
  6#include <bpf/bpf_tracing.h>
  7
  8char _license[] SEC("license") = "GPL";
  9
 10struct {
 11	__uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
 12	__uint(map_flags, BPF_F_NO_PREALLOC);
 13	__type(key, int);
 14	__type(value, long);
 15} map_a SEC(".maps");
 16
 17struct {
 18	__uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
 19	__uint(map_flags, BPF_F_NO_PREALLOC);
 20	__type(key, int);
 21	__type(value, long);
 22} map_b SEC(".maps");
 23
 24int target_hid = 0;
 25bool is_cgroup1 = 0;
 26
 27struct cgroup *bpf_task_get_cgroup1(struct task_struct *task, int hierarchy_id) __ksym;
 28void bpf_cgroup_release(struct cgroup *cgrp) __ksym;
 29
 30static void __on_lookup(struct cgroup *cgrp)
 31{
 32	bpf_cgrp_storage_delete(&map_a, cgrp);
 33	bpf_cgrp_storage_delete(&map_b, cgrp);
 34}
 35
 36SEC("fentry/bpf_local_storage_lookup")
 37int BPF_PROG(on_lookup)
 38{
 39	struct task_struct *task = bpf_get_current_task_btf();
 40	struct cgroup *cgrp;
 41
 42	if (is_cgroup1) {
 43		cgrp = bpf_task_get_cgroup1(task, target_hid);
 44		if (!cgrp)
 45			return 0;
 46
 47		__on_lookup(cgrp);
 48		bpf_cgroup_release(cgrp);
 49		return 0;
 50	}
 51
 52	__on_lookup(task->cgroups->dfl_cgrp);
 
 53	return 0;
 54}
 55
 56static void __on_update(struct cgroup *cgrp)
 
 57{
 
 58	long *ptr;
 59
 60	ptr = bpf_cgrp_storage_get(&map_a, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
 
 61	if (ptr)
 62		*ptr += 1;
 63
 64	ptr = bpf_cgrp_storage_get(&map_b, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
 
 65	if (ptr)
 66		*ptr += 1;
 67}
 68
 69SEC("fentry/bpf_local_storage_update")
 70int BPF_PROG(on_update)
 71{
 72	struct task_struct *task = bpf_get_current_task_btf();
 73	struct cgroup *cgrp;
 74
 75	if (is_cgroup1) {
 76		cgrp = bpf_task_get_cgroup1(task, target_hid);
 77		if (!cgrp)
 78			return 0;
 79
 80		__on_update(cgrp);
 81		bpf_cgroup_release(cgrp);
 82		return 0;
 83	}
 84
 85	__on_update(task->cgroups->dfl_cgrp);
 86	return 0;
 87}
 88
 89static void __on_enter(struct pt_regs *regs, long id, struct cgroup *cgrp)
 
 90{
 
 91	long *ptr;
 92
 93	ptr = bpf_cgrp_storage_get(&map_a, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
 
 
 94	if (ptr)
 95		*ptr = 200;
 96
 97	ptr = bpf_cgrp_storage_get(&map_b, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE);
 
 98	if (ptr)
 99		*ptr = 100;
100}
101
102SEC("tp_btf/sys_enter")
103int BPF_PROG(on_enter, struct pt_regs *regs, long id)
104{
105	struct task_struct *task = bpf_get_current_task_btf();
106	struct cgroup *cgrp;
107
108	if (is_cgroup1) {
109		cgrp = bpf_task_get_cgroup1(task, target_hid);
110		if (!cgrp)
111			return 0;
112
113		__on_enter(regs, id, cgrp);
114		bpf_cgroup_release(cgrp);
115		return 0;
116	}
117
118	__on_enter(regs, id, task->cgroups->dfl_cgrp);
119	return 0;
120}

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
 3
 4#include "vmlinux.h"
 5#include <bpf/bpf_helpers.h>
 6#include <bpf/bpf_tracing.h>
 7
 8char _license[] SEC("license") = "GPL";
 9
10struct {
11	__uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
12	__uint(map_flags, BPF_F_NO_PREALLOC);
13	__type(key, int);
14	__type(value, long);
15} map_a SEC(".maps");
16
17struct {
18	__uint(type, BPF_MAP_TYPE_CGRP_STORAGE);
19	__uint(map_flags, BPF_F_NO_PREALLOC);
20	__type(key, int);
21	__type(value, long);
22} map_b SEC(".maps");
23
 
 
 
 
 
 
 
 
 
 
 
 
24SEC("fentry/bpf_local_storage_lookup")
25int BPF_PROG(on_lookup)
26{
27	struct task_struct *task = bpf_get_current_task_btf();
 
 
 
 
 
 
 
 
 
 
 
28
29	bpf_cgrp_storage_delete(&map_a, task->cgroups->dfl_cgrp);
30	bpf_cgrp_storage_delete(&map_b, task->cgroups->dfl_cgrp);
31	return 0;
32}
33
34SEC("fentry/bpf_local_storage_update")
35int BPF_PROG(on_update)
36{
37	struct task_struct *task = bpf_get_current_task_btf();
38	long *ptr;
39
40	ptr = bpf_cgrp_storage_get(&map_a, task->cgroups->dfl_cgrp, 0,
41				   BPF_LOCAL_STORAGE_GET_F_CREATE);
42	if (ptr)
43		*ptr += 1;
44
45	ptr = bpf_cgrp_storage_get(&map_b, task->cgroups->dfl_cgrp, 0,
46				   BPF_LOCAL_STORAGE_GET_F_CREATE);
47	if (ptr)
48		*ptr += 1;
 
 
 
 
 
 
 
49
 
 
 
 
 
 
 
 
 
 
 
50	return 0;
51}
52
53SEC("tp_btf/sys_enter")
54int 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_cgrp_storage_get(&map_a, task->cgroups->dfl_cgrp, 0,
61				   BPF_LOCAL_STORAGE_GET_F_CREATE);
62	if (ptr)
63		*ptr = 200;
64
65	ptr = bpf_cgrp_storage_get(&map_b, task->cgroups->dfl_cgrp, 0,
66				   BPF_LOCAL_STORAGE_GET_F_CREATE);
67	if (ptr)
68		*ptr = 100;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
69	return 0;
70}