1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/bpf.h> |
3 | |
4 | #include <bpf/bpf_helpers.h> |
5 | |
6 | struct { |
7 | __uint(type, BPF_MAP_TYPE_PROG_ARRAY); |
8 | __uint(max_entries, 5); |
9 | __uint(key_size, sizeof(__u32)); |
10 | __uint(value_size, sizeof(__u32)); |
11 | } jmp_table SEC(".maps" ); |
12 | |
13 | SEC("tc" ) |
14 | int classifier_0(struct __sk_buff *skb) |
15 | { |
16 | bpf_tail_call_static(skb, &jmp_table, 1); |
17 | return 0; |
18 | } |
19 | |
20 | SEC("tc" ) |
21 | int classifier_1(struct __sk_buff *skb) |
22 | { |
23 | bpf_tail_call_static(skb, &jmp_table, 2); |
24 | return 1; |
25 | } |
26 | |
27 | SEC("tc" ) |
28 | int classifier_2(struct __sk_buff *skb) |
29 | { |
30 | return 2; |
31 | } |
32 | |
33 | SEC("tc" ) |
34 | int classifier_3(struct __sk_buff *skb) |
35 | { |
36 | bpf_tail_call_static(skb, &jmp_table, 4); |
37 | return 3; |
38 | } |
39 | |
40 | SEC("tc" ) |
41 | int classifier_4(struct __sk_buff *skb) |
42 | { |
43 | bpf_tail_call_static(skb, &jmp_table, 3); |
44 | return 4; |
45 | } |
46 | |
47 | SEC("tc" ) |
48 | int entry(struct __sk_buff *skb) |
49 | { |
50 | bpf_tail_call_static(skb, &jmp_table, 0); |
51 | /* Check multi-prog update. */ |
52 | bpf_tail_call_static(skb, &jmp_table, 2); |
53 | /* Check tail call limit. */ |
54 | bpf_tail_call_static(skb, &jmp_table, 3); |
55 | return 3; |
56 | } |
57 | |
58 | char __license[] SEC("license" ) = "GPL" ; |
59 | |