1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
__noinline
long changes_pkt_data(struct __sk_buff *sk)
{
return bpf_skb_pull_data(sk, 0);
}
__noinline __weak
long does_not_change_pkt_data(struct __sk_buff *sk)
{
return 0;
}
SEC("?tc")
int main_changes_with_subprogs(struct __sk_buff *sk)
{
changes_pkt_data(sk);
does_not_change_pkt_data(sk);
return 0;
}
SEC("?tc")
int main_changes(struct __sk_buff *sk)
{
bpf_skb_pull_data(sk, 0);
return 0;
}
SEC("?tc")
int main_does_not_change(struct __sk_buff *sk)
{
return 0;
}
__noinline
long might_sleep(struct pt_regs *ctx __arg_ctx)
{
int i;
bpf_copy_from_user(&i, sizeof(i), NULL);
return i;
}
__noinline __weak
long does_not_sleep(struct pt_regs *ctx __arg_ctx)
{
return 0;
}
SEC("?uprobe.s")
int main_might_sleep_with_subprogs(struct pt_regs *ctx)
{
might_sleep(ctx);
does_not_sleep(ctx);
return 0;
}
SEC("?uprobe.s")
int main_might_sleep(struct pt_regs *ctx)
{
int i;
bpf_copy_from_user(&i, sizeof(i), NULL);
return i;
}
SEC("?uprobe.s")
int main_does_not_sleep(struct pt_regs *ctx)
{
return 0;
}
char _license[] SEC("license") = "GPL";
|
