1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/bpf.h> |
3 | #include <bpf/bpf_helpers.h> |
4 | #include "bpf_legacy.h" |
5 | |
6 | struct { |
7 | __uint(type, BPF_MAP_TYPE_PROG_ARRAY); |
8 | __uint(max_entries, 1); |
9 | __uint(key_size, sizeof(__u32)); |
10 | __uint(value_size, sizeof(__u32)); |
11 | } jmp_table SEC(".maps" ); |
12 | |
13 | static __noinline |
14 | int subprog_tail(struct __sk_buff *skb) |
15 | { |
16 | if (load_byte(skb, 0)) |
17 | bpf_tail_call_static(skb, &jmp_table, 1); |
18 | else |
19 | bpf_tail_call_static(skb, &jmp_table, 0); |
20 | return 1; |
21 | } |
22 | |
23 | int count = 0; |
24 | |
25 | SEC("tc" ) |
26 | int classifier_0(struct __sk_buff *skb) |
27 | { |
28 | count++; |
29 | return subprog_tail(skb); |
30 | } |
31 | |
32 | SEC("tc" ) |
33 | int entry(struct __sk_buff *skb) |
34 | { |
35 | bpf_tail_call_static(skb, &jmp_table, 0); |
36 | |
37 | return 0; |
38 | } |
39 | |
40 | char __license[] SEC("license" ) = "GPL" ; |
41 | |