1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/bpf.h>
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #include <bpf/bpf_helpers.h>
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun struct {
7*4882a593Smuzhiyun __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
8*4882a593Smuzhiyun __uint(max_entries, 5);
9*4882a593Smuzhiyun __uint(key_size, sizeof(__u32));
10*4882a593Smuzhiyun __uint(value_size, sizeof(__u32));
11*4882a593Smuzhiyun } jmp_table SEC(".maps");
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun SEC("classifier/0")
bpf_func_0(struct __sk_buff * skb)14*4882a593Smuzhiyun int bpf_func_0(struct __sk_buff *skb)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 1);
17*4882a593Smuzhiyun return 0;
18*4882a593Smuzhiyun }
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun SEC("classifier/1")
bpf_func_1(struct __sk_buff * skb)21*4882a593Smuzhiyun int bpf_func_1(struct __sk_buff *skb)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 2);
24*4882a593Smuzhiyun return 1;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun SEC("classifier/2")
bpf_func_2(struct __sk_buff * skb)28*4882a593Smuzhiyun int bpf_func_2(struct __sk_buff *skb)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun return 2;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun SEC("classifier/3")
bpf_func_3(struct __sk_buff * skb)34*4882a593Smuzhiyun int bpf_func_3(struct __sk_buff *skb)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 4);
37*4882a593Smuzhiyun return 3;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun SEC("classifier/4")
bpf_func_4(struct __sk_buff * skb)41*4882a593Smuzhiyun int bpf_func_4(struct __sk_buff *skb)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 3);
44*4882a593Smuzhiyun return 4;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun SEC("classifier")
entry(struct __sk_buff * skb)48*4882a593Smuzhiyun int entry(struct __sk_buff *skb)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 0);
51*4882a593Smuzhiyun /* Check multi-prog update. */
52*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 2);
53*4882a593Smuzhiyun /* Check tail call limit. */
54*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 3);
55*4882a593Smuzhiyun return 3;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun char __license[] SEC("license") = "GPL";
59*4882a593Smuzhiyun int _version SEC("version") = 1;
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