1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/bpf.h>
3*4882a593Smuzhiyun #include <bpf/bpf_helpers.h>
4*4882a593Smuzhiyun #include "bpf_legacy.h"
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun struct {
7*4882a593Smuzhiyun __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
8*4882a593Smuzhiyun __uint(max_entries, 2);
9*4882a593Smuzhiyun __uint(key_size, sizeof(__u32));
10*4882a593Smuzhiyun __uint(value_size, sizeof(__u32));
11*4882a593Smuzhiyun } jmp_table SEC(".maps");
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun __noinline
subprog_tail2(struct __sk_buff * skb)14*4882a593Smuzhiyun int subprog_tail2(struct __sk_buff *skb)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun volatile char arr[64] = {};
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun if (load_word(skb, 0) || load_half(skb, 0))
19*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 10);
20*4882a593Smuzhiyun else
21*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 1);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun return skb->len;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static __noinline
subprog_tail(struct __sk_buff * skb)27*4882a593Smuzhiyun int subprog_tail(struct __sk_buff *skb)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun volatile char arr[64] = {};
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun bpf_tail_call_static(skb, &jmp_table, 0);
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun return skb->len * 2;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun SEC("classifier/0")
bpf_func_0(struct __sk_buff * skb)37*4882a593Smuzhiyun int bpf_func_0(struct __sk_buff *skb)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun volatile char arr[128] = {};
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun return subprog_tail2(skb);
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun SEC("classifier/1")
bpf_func_1(struct __sk_buff * skb)45*4882a593Smuzhiyun int bpf_func_1(struct __sk_buff *skb)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun volatile char arr[128] = {};
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun return skb->len * 3;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun SEC("classifier")
entry(struct __sk_buff * skb)53*4882a593Smuzhiyun int entry(struct __sk_buff *skb)
54*4882a593Smuzhiyun {
55*4882a593Smuzhiyun volatile char arr[128] = {};
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun return subprog_tail(skb);
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun char __license[] SEC("license") = "GPL";
61*4882a593Smuzhiyun int _version SEC("version") = 1;
62