summarization.c

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