| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/bpf.h> |
| |
| #include <bpf/bpf_helpers.h> |
| |
| struct { |
| __uint(type, BPF_MAP_TYPE_PROG_ARRAY); |
| __uint(max_entries, 3); |
| __uint(key_size, sizeof(__u32)); |
| __uint(value_size, sizeof(__u32)); |
| } jmp_table SEC(".maps"); |
| |
| static volatile int selector; |
| |
| #define TAIL_FUNC(x) \ |
| SEC("classifier/" #x) \ |
| int bpf_func_##x(struct __sk_buff *skb) \ |
| { \ |
| return x; \ |
| } |
| TAIL_FUNC(0) |
| TAIL_FUNC(1) |
| TAIL_FUNC(2) |
| |
| SEC("classifier") |
| int entry(struct __sk_buff *skb) |
| { |
| bpf_tail_call(skb, &jmp_table, selector); |
| return 3; |
| } |
| |
| char __license[] SEC("license") = "GPL"; |
| int _version SEC("version") = 1; |
